3 Visual Basic Grundlagen Programmierung

Transkript

1 3 Visual Basic Grundlagen Programmierung 3 Grundlagen der Programmentwicklung,QGLHVHP.DSLWHOHUIDKUHQ6LH Å ZLHGDV3ULQ]LSGHUHUHLJQLVJHVWHXHUWHQ3URJUDPPLHUXQJIXQNWLRQLHUW Å ZLH6LHHLQH%HQXW]HUREHUIOlFKHHUVWHOOHQXQGZHOFKH6WHXHUHOHPHQWHHVJLEW Å ZHOFKH(LJHQVFKDIWHQ6WHXHUHOHPHQWHKDEHQXQGZLH6LHGLHVHIHVWOHJHQ Å ZLH6LH(UHLJQLVSUR]HGXUHQHUVWHOOHQXQGDXVI KUHQXQGZHOFKH(UHLJQLVVHHVJLEW Å ZLH6LHHLQHDXVI KUEDUH3URJUDPPGDWHLHUVWHOOHQ 9RUDXVVHW]XQJHQ á.hqqwqlvvhghu9lvxdo%dvlf(qwzlfnoxqjvxpjhexqj 3.1 Mit Visual Basic programmieren Das Prinzip der ereignisgesteuerten Programmierung Was sind Ereignisse? 'LH9LVXDO%DVLF3URJUDPPLHUXQJZLUGDOVHUHLJQLVRULHQWLHUWH3URJUDPPLHUXQJEH]HLFKQHW(LQ(UHLJQLVLVWHLQH $NWLRQGLHGHQ3URJUDPPDEODXIEHHLQIOX WYJO$EVFKQLWW $OOH$NWLRQHQ7DVWDWXUHLQJDEHQ0DXVEHZHJXQJHQHLQHV%HQXW]HUVZLHEHLVSLHOVZHLVH â.olfnhqrghu'rsshonolfnhqhlqhu6fkdowiolfkh â 9HUVFKLHEHQgIIQHQRGHU6FKOLH HQHLQHV)HQVWHUVPLWGHU0DXV â 3RVLWLRQLHUHQGHV&XUVRUVLQHLQ(LQJDEHIHOGPLWGHU 7DVWH VLQG(UHLJQLVVH hehu(uhljqlvvhn QQHQLQWHUQH3URJUDPPDEOlXIHZLHEHLVSLHOVZHLVH â %HUHFKQXQJHQGXUFKI KUHQ â giiqhqxqg6fkolh HQHLQHV)HQVWHUVYRP3URJUDPPJHVWHXHUW â (UPLWWHOQGHUDNWXHOOHQ8KU]HLWXQGGHVDNWXHOOHQ'DWXPV DXVJHO VWZHUGHQ Ereignisprozedur Sub Cmd_Sonne_Click() Pic_Regen.Visible = False Pic_Sonne.Visible = True End Sub (UHLJQLV.OLFNDXIHLQH6FKDOWIOlFKH$XIUXIGHU(UHLJQLVSUR]HGXU5HDNWLRQ$Q]HLJHGHV%LOGHV 'LHVH%HLVSLHOZLUGVSlWHUDXIJHJULIIHQXQGLQVHLQHQ(LQ]HOKHLWHQHUOlXWHUW Auf Ereignisse reagieren 0LW9LVXDO%DVLFN QQHQ3URJUDPPHHQWZLFNHOWZHUGHQGLHGXUFKGLHJUDILVFKH%HQXW]HUREHUIOlFKH:LQGRZV PLW6WHXHUHOHPHQWHQZLHEHLVSLHOVZHLVH'LDORJIHQVWHUQ6FKDOWIOlFKHQ(LQJDEHIHOGHUQJHVWHXHUWZHUGHQ

2 Grundlagen der Programmentwicklung 3 'XUFK HLQ (UHLJQLV EHLVSLHOVZHLVH.OLFNHQ 'RSSHONOLFNHQ HLQHU 6FKDOWIOlFKH NDQQ HLQH 5HDNWLRQ EHLVSLHOV ZHLVHgIIQHQHLQHV)HQVWHUVKHUYRUJHUXIHQZHUGHQ'LHVH5HDNWLRQZLUGLQ)RUPYRQ9LVXDO%DVLF$QZHLVXQ JHQLQHLQHU(LQKHLWHUVWHOOWGLHDOV(UHLJQLVSUR]HGXUEH]HLFKQHWZLUG(LQH(UHLJQLVSUR]HGXUHQWKlOWGLH$QZHL VXQJHQGLHDXVJHI KUWZHUGHQVREDOGHLQ(UHLJQLVHLQWULWW 9LVXDO%DVLFNHQQWDXFK3UR]HGXUHQGLHQLFKWHUHLJQLVRULHQWLHUWVLQG3UR]HGXUHQZHUGHQLQZHLWHUH(LQKHLWHQ ]XVDPPHQJHID WGLHDOV0RGXOHEH]HLFKQHWZHUGHQ -HGH)RUPXQGMHGHV6WHXHUHOHPHQWEHLVSLHOVZHLVH6FKDOWIOlFKH(LQJDEHIHOG/LVWHQIHOGEHVLW]WHLQH$Q]DKO YRQP JOLFKHQ(UHLJQLVVHQ:HQQHLQHVGLHVHU(UHLJQLVVHHLQWULWWUXIW9LVXDO%DVLFGLHHQWVSUHFKHQGH(UHLJQLV SUR]HGXUDXI'LH$QZHLVXQJHQLQQHUKDOEGHUDXIJHUXIHQHQ(UHLJQLVSUR]HGXUZHUGHQYRQREHQQDFKXQWHQDE JHDUEHLWHW]XP(UVWHOOHQYRQ(UHLJQLVSUR]HGXUHQYJO$EVFKQLWW Vorgehensweise bei der Erstellung von Anwendungen 1. Schritt: Problemstellung analysieren =X %HJLQQ PX GLH $XIJDEHQVWHOOXQJ SUl]LVLHUW ZHUGHQ $OOH QRW ZHQGLJHQ,QIRUPDWLRQHQ P VVHQ JHVDPPHOW ZHUGHQ GLH I U GLH / VXQJ GHV 3UREOHPV ZLFKWLJ VLQG 'DQDFK N QQHQ GLH ZLFKWLJVWHQ 2EMHNWH )RUPHQ 6WHXHUHOHPHQWH XQG DQGHUH 3URJUDPPHOHPHQWH GLHI UGHQ3URJUDPPDEODXIQRWZHQGLJVLQGIHVWJHOHJWXQGGHU3UR JUDPPDEODXIVWUXNWXULHUWZHUGHQ 2. Schritt: Benutzeroberfläche erstellen 'XUFK$QRUGQHQDOOHUQRWZHQGLJHQ6WHXHUHOHPHQWH ]%(LQJDEHIHO GHU2SWLRQVIHOGHU6FKDOWIOlFKHQHWFDXIGHU)RUPZLUGGLH%HQXW ]HUREHUIOlFKHGHV3URJUDPPVHUVWHOOW 3. Schritt: Eigenschaften festlegen ) U GLH ]XYRU HUVWHOOWHQ 6WHXHUHOHPHQWH ZHUGHQ GLH (LJHQVFKDIWHQ IHVWJHOHJW EHLVSLHOVZHLVH *U H )DUEH %H]HLFKQXQJ GHU 6FKDOWIOl FKHQ7H[WXQG(LQJDEHIHOGHU 4. Schritt: Ereignisprozeduren codieren,qhlqhu(uhljqlvsur]hgxuzluglq)rupyrq9lvxdo%dvlf$qzhlvxqjhq EHVFKULHEHQ ZLHHLQEHVWLPPWHV6WHXHUHOHPHQW DXI HLQ EHVWLPPWHV (UHLJQLV EHLVSLHOVZHLVH.OLFNHQ 'RSSHONOLFNHQ HLQHU 6FKDOWIOlFKH UHDJLHUHQVROO 5. Schritt: Ausführen bzw. Testen der Anwendung 8PGLH5LFKWLJNHLWGHV3URJUDPPV]XSU IHQPX HVDQYHUVFKLHGH QHQ %HLVSLHOHQ JHWHVWHW ZHUGHQ 7UHWHQ ZlKUHQG GHV 7HVWV )HKOHU DXIP VVHQGLHREHQJHQDQQWHQ6FKULWWHZLHGHUKROWZHUGHQ 6. Schritt: Ausführbare Programmdatei erstellen :HLVW GLH $QZHQGXQJ NHLQH)HKOHU PHKU DXI NDQQ HLQH 3URJUDPP GDWHL HUVWHOOW ZHUGHQ GLH XQDEKlQJLJ YRQ 9LVXDO %DVLF DXVJHI KUW XQG YRP :LQGRZV ([SORUHU E]Z 3URJUDPP0DQDJHU DXIJHUXIHQ ZHUGHQNDQQ 352*5$00(;(

3 3 Visual Basic Grundlagen Programmierung Aufbau einer Visual Basic-Anwendung $QZHQGXQJHQZHUGHQXQWHU9LVXDO%DVLFLQ)RUPYRQ3URMHNWHQYHUZDOWHW$OOH 'DWHLHQ GLH]XU MHZHLOLJHQ $QZHQGXQJ JHK UHQ ZHUGHQ ]XVDPPHQ LQ HLQHP 3URMHNWJHVSHLFKHUW (LQH W\SLVFKH 9LVXDO%DVLF$QZHQGXQJ EHVWHKW DXV PLQGHVWHQV]ZHL 'DWHLHQ GHU3URMHNWGDWHLXQGHLQHP)RUPXODU ã ã ã,qghu3urmhnwgdwhlyesvlqgdooh]xp3urmhnwjhk UHQGHQ'DWHLHQDXI JHI KUW 'DV)RPXODULQ9LVXDO%DVLFDOV)RUPEH]HLFKQHWZLUGLQHLQHUHLJHQHQ 'DWHLIUPDEJHOHJW +DEHQ6LHDOOJHPHLQH 3UR]HGXUHQEDVIRUPXOLHUWZHUGHQ GLHVH LP DXWRPDWLVFK DQJHOHJWHQ 2UGQHU 0RGXOHYHUZDOWHW 3.2 Mit Projekten arbeiten Neues Projekt erstellen 6WDQGDUGPl LJZLUG9LVXDO%DVLFPLWHLQHPQHXHQOHHUHQ3URMHNWJH IIQHW6LHN QQHQHLQQHXHV3URMHNWDEHU DXFKZLHIROJWHU]HXJHQ 5XIHQ6LHGHQ0HQ SXQNW'$7(,1(8(6352-(.7DXI $OWHUQDWLYHQ STRG N RGHU,VWEHUHLWVHLQ3URMHNWJH IIQHWZLUGGLHVHVJHVFKORVVHQ6RIHUQ6LHLPDNWXHOOHQ3URMHNWbQGHUXQJHQYRUJH QRPPHQXQGGLHVHQRFKQLFKWJHVSHLFKHUW KDEHQ ZHUGHQ 6LH LQ PHKUHUHQ'LDORJIHQVWHUQ DXIJHIRUGHUW GDV DNWXHOOH3URMHNW]XVSHLFKHUQ.OLFNHQ 6LH GRSSHOW DXI GDV 6\PERO 67$1'$5'(;( $QVFKOLH HQGZLUGHLQQHXHV3URMHNWEHJRQQHQ Projekt speichern :lkohq6lhghq0hq SXQNW '$7(, 352 -(.763(,&+(51 $OWHUQDWLYH 9LVXDO %DVLF IRUGHUW 6LH EHLP HUVWHQ 6SHL FKHUYRUJDQJ DXI GLH JHUDGH EHDUEHLWHWH )RUPE]ZGDVQHXHUVWHOOWH0RGXO]X EH QHQQHQ *HEHQ 6LH GHQ )RUP E]Z 0RGXOQDPHQ HLQ 9LVXDO%DVLFYHUJLEWI U)RUPGDWHLHQ DXWR PDWLVFKGLH'DWHLHUZHLWHUXQJ)500RGXOH HUKDOWHQGLH'DWHLHUZHLWHUXQJ%$6 'DQDFK IRUGHUW 6LH 9LVXDO %DVLF DXI GDV JHVDPWH3URMHNW]XVSHLFKHUQ *HEHQ6LHGHQ3URMHNWQDPHQHLQ 9LVXDO %DVLF YHUJLEW I U GHQ 3URMHNWQDPHQ DXWRPDWLVFKGLH'DWHLHUZHLWHUXQJ9%3 Abb. 3.1 Projekt speichern

4 Grundlagen der Programmentwicklung 3 Projekt öffnen :lkohq6lhghq0hq SXQNW'$7(,352-(.7g))1(1 $OWHUQDWLYHQ STRG O RGHU.OLFNHQ6LHGRSSHOWDXIGHQJHZ QVFKWHQ3URMHNWQDPHQ Dateien hinzufügen, speichern und löschen 6LHKDEHQGLH0 JOLFKNHLWHLQ]HOQH)RUPHQ0RGXOHRGHU=XVDW]VWHXHUHOHPHQWHHLQHP3URMHNWKLQ]X]XI JHQ RGHU]XO VFKHQE]ZHLQ]HOQH'DWHLHQ]XVSHLFKHUQ 6LHP FKWHQ GHP3URMHNWHLQH[LVWLHUHQ GHV(OHPHQWKLQ]XI JHQ :lkohq6lhghq0hq SXQNW352-(.7'$7(,+,1=8)h*(1 $OWHUQDWLYH STRG D HLQEHVWHKHQGHV(OHPHQW DXVGHP3URMHNWHQWIHUQHQ :lkohq 6LH GHQ 0HQ SXQNW 352-(.7 (17)(51( DPH 6LHN QQHQGDV(OHPHQWMHGHU]HLWZLHGHUKLQ]XI JHQ HLQ(OHPHQWHLQHV3URMHNWHV VSHLFKHUQ HLQ(OHPHQWHLQHV3URMHNWHV XQWHUHLQHPDQGHUHQ1DPHQ VSHLFKHUQ :lkohq6lhghq0hq SXQNW'$7(,1DPH63(,&+(51 $OWHUQDWLYH STRG S :lkohq 6LH GHQ 0HQ SXQNW '$7(, 63(,&+( DPH 817(5 'LHDOWH9HUVLRQGHU'DWHLEOHLEW]XVlW]OLFK]XUQHXHQ'DWHLEH VWHKHQ 3.3 Die Steuerelemente der Werkzeugsammlung Eine Benutzeroberfläche erstellen,qhlqhu)ruphqwzhuihq6lhglh%hqxw]hurehuiolfkh,kuhv3urjudppv'lh%hqxw]hurehuiolfkhlvwglh6lfkwglh QDFKGHP6WDUWHQGHU$QZHQGXQJDP%LOGVFKLUPHUVFKHLQW$XILKUSRVLWLRQLHUHQ6LHEHLVSLHOVZHLVHDOOH(LQ JDEHXQG$XVJDEHIHOGHUGLHI UGLH$XVI KUXQJGHV3URJUDPPVQRWZHQGLJVLQG Notizen

5 3 Visual Basic Grundlagen Programmierung 6LH VROOWHQ EHLP (QWZHUIHQ YRQ 'LDORJHQ XQG )RU PHQEHVWLPPWH5HJHOQHLQKDOWHQXPEHLVSLHOVZHLVH GHQ 'LDORJHQ HLQ HLQKHLWOLFKHV (UVFKHLQXQJVELOG ]X JHEHQ GLH 'LDORJH EHQXW]HUIUHXQGOLFK ]X JHVWDOWHQ XQGGHP%HQXW]HUHLQXQQ WLJHV6XFKHQQDFK,QIRU PDWLRQHQ]XHUVSDUHQ $OOJHPHLQH +LQZHLVH ]XU *HVWDOWXQJ YRQ 'LDORJHQ ILQGHQ 6LH EHLVSLHOVZHLVH XQWHU 9LVXDO %DVLF'RNX PHQWDWLRQ$UEHLWHQ PLW 9LVXDO %DVLF3URJUDPPLHU KDQGEXFK7HLO (LQVDW]P JOLFKNHLWHQ I U 9LVXDO %DVLF(UVWHOOHQ HLQHU %HQXW]HUREHUIOlFKH(QWZHUIHQ YRQ $QZHQGXQJHQ LP +LQEOLFN DXI GHQ %HQXW]HU *UXQGODJHQGHV2EHUIOlFKHQHQWZXUIV 9HUZHQGHQ6LH HLQSUlJVDPH1DPHQ *UXSSLHUXQJHQ GLH6FKDOWIOlFKHQ2.XQG $%%5(&+(1 ZHLWHUH6FKDOWIOlFKHQ GLH6FKDOWIOlFKH+,/)( QLFKW]XYLHOH6WHXHUHOHPHQWH DXIHLQHP'LDORJ 9HUJHEHQ6LHHLQHQHLQSUlJVDPHQDXVVDJHNUlIWLJHQ1DPHQI UGHQ'LDORJ WLWHO'HU%HQXW]HUVROOWHLPPHUZLVVHQZR]XGHU'LDORJGLHQW *UXSSLHUHQ6LH]XVDPPHQJHK UHQGH6WHXHUHOHPHQWHXQGYHUVHKHQ6LHGLHVH PLWHLQHU%HVFKULIWXQJ 'LHVH6WDQGDUG6FKDOWIOlFKHQVROOWHQDXIMHGHP'LDORJHQWKDOWHQXQGUHFKWV REHQSOD]LHUWVHLQXPGHP$QZHQGHUXQQ WLJHV6XFKHQ]XHUVSDUHQ 6ROOHQ DXI,KUHP 'LDORJ ZHLWHUH 6FKDOWIOlFKHQ HQWKDOWHQ VHLQ SOD]LHUHQ 6LH GLHVH OHLFKW DEJHVHW]W XQWHU GHQ 6FKDOWIOlFKHQ 2. XQG $%%5(&+(1 $FKWHQ 6LH DXFK DXI (LQKHLWOLFKNHLW GHU 6FKDOWIOlFKHQ LQ *U H XQG $XVULFKWXQJ YJO$EVFKQLWW (QWKlOW,KU 'LDORJ GLH 6FKDOWIOlFKH +,/)( VROOWH GLHVH UHFKWV XQWHQ DXI GHP 'LDORJSOD]LHUWVHLQ 9HUPHLGHQ 6LH EHUODGHQH 'LDORJH,KU 'LDORJ VROOWH LPPHU EHUVLFKWOLFK VHLQ 'HU $QZHQGHU VROOWH QDFK,QIRUPDWLRQHQ QLFKW ODQJH VXFKHQ P VVHQ 9HUZHQGHQ 6LH JHJHEHQHQIDOOV 5HJLVWHU RGHU (UZHLWHUXQJHQ ]% EHU HLQH 6FKDOWIOlFKH237,21( Überblick über die Steuerelemente,QGHU:HUN]HXJVDPPOXQJEHILQGHQVLFK]DKOUHLFKH6WHXHUHOHPHQWHGLH]XU*HVWDOWXQJHLQHU)RUPE]ZI U GLH$QZHQGXQJEHQ WLJWZHUGHQ Cursor PictureBox (Bildfeld) Label (Bezeichnungsfeld) TextBox (Eingabefeld) Frame (Rahmen) CommandButton (Schaltfläche) CheckBox (Kontrollfeld) 'HU&XUVRULVWVHOEVWNHLQ6WHXHUHOHPHQW,VWGLHVH6FKDOWIOlFKHDNWLYLHUWN Q QHQ 6WHXHUHOHPHQWH DXI GHU )RUP YHUVFKREHQ RGHU LQ LKUHU *U H YHUlQGHUW ZHUGHQ =XU$Q]HLJHYRQ7H[W%LOGHUQ%LWPDS,FRQE]Z6\PERO0HWDGDWHLXQG*UD ILNHQYJO,PDJH =XU $Q]HLJH YRQ HUOlXWHUQGHP 7H[W VLH JHEHQ EHLVSLHOVZHLVH,QIRUPDWLRQHQ EHU 6WHXHUHOHPHQWLQKDOWH 'HU 7H[W NDQQ YRP $QZHQGHU QLFKW EHDUEHLWHW ZHUGHQ =XU$EIUDJHYRQ%HQXW]HUHLQJDEHQ7H[WHLQJDEHQ EHUGLH7DVWDWXU 6WHXHUHOHPHQWH EHLVSLHOVZHLVH 2SWLRQV RGHU.RQWUROOIHOGHU N QQHQ LQ HLQHP 5DKPHQJUXSSLHUWZHUGHQ 6FKDOWIOlFKHQ ZHUGHQ HLQJHVHW]W XP %HIHKOH E]Z (UHLJQLVSUR]HGXUHQ EHL VSLHOVZHLVHGXUFK.OLFNHQRGHU'RSSHONOLFNHQ]XDNWLYLHUHQ 8PDXVHLQHU/LVWHYRQ2SWLRQHQ NHLQH PHKUHUH RGHU DOOH DXV]XZlKOHQ.RQ WUROOIHOGHUN QQHQHLQJHVFKDOWHWXQGDXVJHVFKDOWHWZHUGHQ

6 Grundlagen der Programmentwicklung 3 OptionButton (Optionsfeld) ComboBox (Kombinationsfeld) ListBox (Listenfeld) HScrollBar (Horizontale Bildlaufleiste) VscrollBar (Vertikale Bildlaufleiste) Timer (Zeitgeber) DriveListBox (Laufwerk-Listenfeld) DirListBox (Verzeichnis-Listenfeld) FileListBox (Datei-Listenfeld) Shape (Figur) Line (Linie) Image (Anzeige) Data (Datensteuerelement) OLE 2SWLRQVIHOGHU ZHUGHQ HLQJHVHW]W ZHQQ DXV HLQHU $Q]DKO YRQ 2SWLRQHQ JHQDX HLQH2SWLRQGXUFK$QNOLFNHQDXVJHZlKOWZHUGHQNDQQ =XU$XVZDKOHLQHV(LQWUDJVDXVHLQHU/LVWHRGHU]XU(LQJDEHHLQHV7H[WHVLQHLQ (LQJDEHIHOG.RPELQDWLRQVIHOGHU EHVWHKHQ DXV HLQHP (LQJDEHIHOG XQG HLQHP /LVWHQIHOG $XVHLQHP/LVWHQIHOGN QQHQHLQRGHUPHKUHUH(LQWUlJHDXVJHZlKOWZHUGHQ 'LHQHQGD]X)HQVWHULQKDOWH]XYHUVFKLHEHQXPDOOH,QKDOWHDX HUKDOEGHVDN WXHOOHQ /LVWHQ RGHU )HQVWHUDXVVFKQLWWV DQ]HLJHQ ]X ODVVHQ KRUL]RQWDOH %LOG ODXIOHLVWHQYHUVFKLHEHQGHQ)HQVWHULQKDOWQDFKUHFKWVE]ZQDFKOLQNV 9HUWLNDOH %LOGODXIOHLVWHQ YHUVFKLHEHQ GHQ )HQVWHULQKDOW QDFK REHQ E]Z QDFK XQWHQ :LUGLQUHJHOPl LJHQ$EVWlQGHQDXIJHUXIHQXP$QZHLVXQJHQLP+LQWHUJUXQG DXV]XI KUHQGDV6WHXHUHOHPHQWVHOEVWLVWZlKUHQGGHU/DXI]HLWQLFKWVLFKWEDU,QGLHVHP/LVWHQIHOGZHUGHQDOOHYHUI JEDUHQ/DXIZHUNHDQJH]HLJWYRQGHQHQ HLQ/DXIZHUNDXVJHZlKOWZHUGHQNDQQ 'DV 9HU]HLFKQLV/LVWHQIHOG ]HLJW LQ )RUP HLQHU %DXPYHUl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otizen

7 3 Visual Basic Grundlagen Programmierung +DEHQ6LHEHLP6WDUWHQYRQ9LVXDO%DVLFGDV6\PEROÃ9%(,167(,*(5Ã(',7,2167(8(5(/(0(17(JHZlKOWLP'LD ORJIHQVWHU1(8(6Ã352-(.75HJLVWHUÃ1(8ZHUGHQ,KQHQLQGHU:HUN]HXJVDPPOXQJZHLWHUH6WHXHUHOHPHQWH]XU 9HUI JXQJJHVWHOOW SSTab (Register) MSFlexGrid (Datengebundene Tabelle) CommonDialog (Standarddialog) TabStrip (Register) Toolbar (Symbolleiste) StatusBar (Statuszeile) ProgressBar (Fortschrittsleiste) TreeView (Hierarchisches Listenfeld) ListView (Listenansicht) ImageList (Abbildungsliste) Slider (Schieberegler) ImageCombo DataGrid (Datengebundene Tabelle) Adodc (Datenbankfeld) MSHFlexGrid (Datengebundene Tabelle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lQJHU DQKDOWHQGHQ 3UR]HVVHV EHLVSLHOV ZHLVHHLQHV6SHLFKHUYRUJDQJV =XUKLHUDUFKLVFKHQ$Q]HLJHYRQ(OHPHQWHQHLQHU/LVWHEHLVSLHOVZHLVH]XP$XI OLVWHQYRQ9HU]HLFKQLVVHQXQG'DWHLHQ =XU$Q]HLJHYRQ(OHPHQWHQLQHLQHU/LVWHlKQOLFKGHP:LQGRZV([SORUHUN Q QHQYHUVFKLHGHQH$QVLFKWHQGHILQLHUWZHUGHQ(OHPHQWHDOV7H[WRGHUDOV6\P EROH =XP(UVWHOOHQYRQ%LOGHUOLVWHQDXIMHGHV%LOGNDQQGXUFKHLQHQ,QGH[]XJHJULI IHQZHUGHQ'DV6WHXHUHOHPHQWZLUGPHLVWGD]XYHUZHQGHWDQGHUH6WHXHUHOH PHQWHEHLVSLHOVZHLVH6\PEROOHLVWHQPLW$EELOGXQJHQ]XEHOLHIHUQ =XU$EIUDJHHLQHV:HUWHVDXVHLQHPIHVWJHOHJWHQ:HUWHEHUHLFKPLW+LOIHHLQHV 6FKLHEHUHJOHUV =XU$XVZDKOHLQHV(OHPHQWHVDXVHLQHP/LVWHQIHOGXQGRGHU]XU(LQJDEHHLQHV 7H[WHV LQ HLQ (LQJDEHIHOG ]XVlW]OLFK NDQQ QHEHQ MHGHP /LVWHQHLQWUDJ HLQ %LW PDSDQJH]HLJWZHUGHQ =XU $Q]HLJH YRQ 'DWHQWDEHOOHQ LQ 9HUELQGXQJ PLW GHP 'DWHQVWHXHUHOHPHQW HLQH%HDUEHLWXQJGHU'DWHQlQGHUQHLQI JHQO VFKHQLVWP JOLFK 'LHQW DOV 'DWHQTXHOOH I U GLH GDPLW YHUEXQGHQHQ 6WHXHUHOHPHQWH XQWHUVW W]W EHLP%HZHJHQGXUFKGLH'DWHQVlW]H (UZHLWHUWH)XQNWLRQGHV06)OH[*ULG%HDUEHLWXQJGHU'DWHQLVWHEHQIDOOVQLFKW P JOLFK Steuerelemente einer Form hinzufügen 'LH)RUPLVWLQHLQ5DVWHUHLQJHWHLOWXPGLH6WHXHUHOHPHQWHJHQDXDQRUGQHQ]XN QQHQ=XU/DXI]HLWLVWGLHVHV QLFKWVLFKWEDU(LQLJH6WHXHUHOHPHQWHVLQGQXULQGHU(QWZXUIVDQVLFKWVLFKWEDUEHLVSLHOVZHLVHGHU=HLWJHEHU.OLFNHQ 6LH DXI GDV 6WHXHUHOHPHQW LQ GHU :HUN]HXJVDPP OXQJGDV6LHGHU)RUPKLQ]XI JHQP FKWHQ (VHUVFKHLQWQXQDNWLYLHUW =LHKHQ 6LH LQ GHU )RUP EHL JHGU FNWHU OLQNHU 0DXVWDVWH GDV 6WHXHUHOHPHQWDXIGLHJHZ QVFKWH*U H :HQQ 6LH GLH 0DXVWDVWH ZLHGHU ORVODVVHQ HUVFKHLQW GDV 6WHXHUHOHPHQWDXIGHU)RUP

8 Grundlagen der Programmentwicklung 3 6LHP FKWHQ HLQ6WHXHUHOHPHQW YHUVFKLHEHQ HLQ6WHXHUHOHPHQWLQGHU *U HYHUlQGHUQ =HLJHQ6LHPLWGHU0DXVDXIGDV6WHXHUHOHPHQWXQG]LHKHQ6LHHV EHLJHGU FNWHUOLQNHU0DXVWDVWHDQGLHJHZ QVFKWH6WHOOH 0DUNLHUHQ6LHGDV 6WHXHUHOHPHQW XQG]LHKHQ 6LH HV GXUFK $QNOLN NHQHLQHV(FNSXQNWHVDXIGLHJHZ QVFKWH*U H Eigenschaften festlegen +DEHQ 6LH 6WHXHUHOHPHQWH,KUHU )RUP KLQ]XJHI JW N QQHQ GLH (LJHQVFKDIWHQ DOOHU 2EMHNWH )RUPHQ XQG 6WHXHUHOHPHQWH IHVWJHOHJW ZHUGHQ 2EMHNWH EHVLW]HQ YHUVFKLHGHQH (LJHQVFKDIWHQ EHLVSLHOVZHLVH *U H )DUEH3RVLWLRQRGHU(LJHQVFKDIWHQGLHGHQ3URJUDPPDEODXIEHHLQIOXVVHQ %HLP +LQ]XI JHQ HLQHV 6WHXHUHOHPHQWV ]XU )RUP ZHUGHQ LKP 6WDQGDUG(LJHQVFKDIWHQ ]XJHZLHVHQ 'LHVH :HUWHN QQHQ6LHQDFKWUlJOLFKLP(LJHQVFKDIWHQIHQVWHUlQGHUQXQG,KUHU$QZHQGXQJDQSDVVHQ Eigenschaften festlegen bzw. ändern 0DUNLHUHQ6LHGDV2EMHNW)RUPRGHU6WHXHUHOHPHQW RGHU :lkohq6lhgdv2emhnwdxvghp/lvwhqihoglp(ljhqvfkdiwhqihq VWHU DXV LQGHP 6LH DXI GHQ 3IHLO UHFKWV QHEHQ GHP /LVWHQIHOG NOLFNHQ.OLFNHQ6LHLQGHU/LVWHGHU(LJHQVFKDIWHQDXIGHQ]XlQGHUQGHQ :HUW -HQDFK(LJHQVFKDIWN QQHQ6LH GHQYRUJHJHEHQHQ:HUWGXUFKHLQHQQHXHQ:HUW EHUVFKUHLEHQ GXUFK.OLFNDXIGHQ3IHLO HLQ/LVWHQIHOG]XU$XVZDKOHLQHV :HUWHV IIQHQ GXUFK.OLFNDXIGDV6\PERO HLQ'LDORJIHQVWHU]XU:HUWH VWHOOXQJDQ]HLJHQ Notizen

9 3 Visual Basic Grundlagen Programmierung Überblick wichtiger Eigenschaften $OLJQPHQW %DFN&RORU %RUGHU6W\OH &DQFHO &DSWLRQ 'DWD)LHOG 'HIDXOW 'UDJ,FRQ 'UDJ0RGH (QDEOHG 7H[W NDQQ UHFKWVE QGLJ OLQNVE QGLJ RGHU]HQWULHUWDXVJHJHEHQZHUGHQ 'LH +LQWHUJUXQGIDUEH GHV 2EMHNWHV NDQQYHUlQGHUWZHUGHQ 'LH$UWGHU2EMHNW8PUDKPXQJNDQQ EHVWLPPWZHUGHQ /HJWIHVWREHV VLFK XP GLH 6FKDOW IOlFKH$%%5(&+(1KDQGHOW 6WHOOW GLH %HVFKULIWXQJ E]Z hehu VFKULIWHLQHV2EMHNWHVGDU 'DWHQ N QQHQ PLW HLQHP 'DWHQ 6WHXHUHOHPHQWYHUNQ SIWZHUGHQ (LQH6FKDOWIOlFKHLVWDXVJHZlKOWXQG NDQQ PLW RETURN EHVWl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lOW GHQ 7H[W GHV 6WHXHUHOH PHQWHV 'LH 3RVLWLRQ < GHU OLQNHQ REHUHQ (FNHNDQQHLQJHVWHOOWZHUGHQ 2EMHNWH N QQHQ ZlKUHQG GHV 3UR JUDPPODXIVVLFKWEDUXQVLFKWEDUVHLQ )RUH&RORU /HJWGLH6FKULIWIDUEHGHV7H[WHVIHVW :LGWK 'LH %UHLWH HLQHV 2EMHNWHV ZLUG IHVW JHOHJW 0DQFKH(LJHQVFKDIWHQKDEHQI UYHUVFKLHGHQH2EMHNWHXQWHUVFKLHGOLFKH%HGHXWXQJ'DPLW VWHKHQ,KQHQ I U MHGHV2EMHNWXQWHUVFKLHGOLFKH:HUWHDOV(LQVWHOOXQJ]XU9HUI JXQJ 6WHXHUHOHPHQW %HGHXWXQJGHU(LJHQVFKDIWValue (LQVWHOOXQJVP JOLFKNHLWHQ.RQWUROOIHOG 2SWLRQVIHOG 6FKDOWIOlFKH +RUL]RQWDOHXQG YHUWLNDOH%LOGODXIOHLVWHQ (LQ.RQWUROOIHOG LVW DNWLYLHUW RGHU QLFKWDNWLYLHUW (LQ 2SWLRQVIHOG LVW DNWLYLHUW RGHU QLFKWDNWLYLHUW (LQH 6FKDOWIOlFKH ZLUG JHGU FNW RGHUQLFKWJHGU FNW 'LH3RVLWLRQGHV%LOGODXIIHOGHVHLQHU %LOGODXIOHLVWHZLUGHLQJHVWHOOW QLFKWDXVJHZlKOW DXVJHZlKOW DEJHEOHQGHW 7UXHZDKUDXVJHZlKOW )DOVHIDOVFKQLFKWDXVJHZlKOW 7UXHJHGU FNW )DOVHQLFKWJHGU FNW :HUWH]ZLVFKHQXQGE]ZGHU (LJHQVFKDIWHQ(LQVWHOOXQJHQ0LQXQG0D[ Beispiel zur Verwendung von Steuerelementen 6LHZROOHQHLQ3URJUDPP:HWWHUHUVWHOOHQGDVGLHEHLGHQ6FKDOWIOlFKHQ6RQQHQVFKHLQXQG5HJHQVRZLH]ZHL %LOGIHOGHUHQWKlOW%HL.OLFNDXIHLQHGHU6FKDOWIOlFKHQVROOLPMHZHLOLJHQ%LOGIHOGGLHHQWVSUHFKHQGH*UDILNDQ JH]HLJWZHUGHQ

10 Grundlagen der Programmentwicklung 3 Form mit Steuerelementen anlegen giiqhq6lhhlqqhxhv3urmhnw.olfnhq6lhlqghu:hun]hxjvdppoxqjdxigdv6fkdowiolfkhq V\PERO&RPPDQG%XWWRQ XQG]LHKHQ6LHHLQH6FKDOWIOl FKHDXIGHU)RUPDXI ) JHQ6LHGHU)RUPDXIGLHJOHLFKH:HLVHHLQHZHLWHUH6FKDOW IOlFKHVRZLH]ZHL%LOGIHOGHU3LFWXUH%R[ KLQ]X Abb. 3.2 Form erstellen Eigenschaften einstellen 0DUNLHUHQ6LHGLHHUVWH6FKDOWIOlFKH,P(LJHQVFKDIWHQIHQVWHUHUVFKHLQHQGLHI UGLHVHV2EMHNWYHU I JEDUHQ(LJHQVFKDIWHQ 7UDJHQ 6LH EHL GHU (LJHQVFKDIW (Name) HLQHQ DXVVDJHNUlIWL JHQ1DPHQHLQ]%&PGB6RQQH /HJHQ 6LH EHU GLH (LJHQVFKDIW Caption GLH %HVFKULIWXQJ IHVW 0DUNLHUHQ 6LH GLH )RUP XQG OHJHQ 6LH HEHQIDOOV EHU GLH (LJHQVFKDIWCaptionHLQH%HVFKULIWXQJI UGLH7LWHOOHLVWHGHV )RUPXODUHVIHVW]%:HWWHU 0DUNLHUHQ 6LH GDV %LOGIHOG XQG YHUJHEHQ 6LH HLQHQ 1DPHQ ]%3LFB6RQQH 8PGLH*UDILNIHVW]XOHJHQNOLFNHQ6LHLQGLHUHFKWH6SDOWHGHU (LJHQVFKDIWPictureXQGGRUWDXIGDV6\PERO Abb. 3.3 Eigenschaften festlegen :lkohq 6LH LP IROJHQGHQ 'LDORJIHQVWHU GLH JHZ QVFKWH %LOG GDWHLDXV 6WHOOHQ 6LH DXI GLH JOHLFKH :HLVH GLH (LJHQVFKDIWHQ I U GLH EHLGHQ5HJHQ6WHXHUHOHPHQWHHLQ 6SHLFKHUQ 6LH GDV 3URMHNW EHLVSLHOVZHLVH XQWHU GHP 1DPHQ :HWWHU Abb. 3.4 Bilddatei auswählen Notizen

11 3 Visual Basic Grundlagen Programmierung 3.4 Ereignisprozeduren erstellen -HGHV6WHXHUHOHPHQWXQGMHGH)RUPNDQQDXIYHUVFKLHGHQH(UHLJQLVVHEHLVSLHOVZHLVH.OLFNHQHLQHU6FKDOWIOl FKH UHDJLHUHQ 'D]X P VVHQ 6LH VRJHQDQQWH (UHLJQLVSUR]HGXUHQ SURJUDPPLHUHQ 'LH (UHLJQLVVH GLH HLQHP 2EMHNW]XJHRUGQHWVLQGVLQGYRPMHZHLOLJHQ2EMHNWW\SDEKlQJLJ 3UR]HGXUHQZHUGHQLQ(UHLJQLVSUR]HGXUHQXQGQLFKWHUHLJQLVRULHQWLHUWH3UR]HGXUHQXQWHUWHLOWYJO.DSLWHO 'HU3URJUDPPFRGHZLUGLQ9LVXDO%DVLFLQ%O FNHQJHVFKULHEHQGLHDOV3UR]HGXUHQEH]HLFKQHWZHUGHQ7ULWW GDV(UHLJQLVQLFKWHLQZLUGGLH(UHLJQLVSUR]HGXUDXFKQLFKWDXVJHI KUW 'DV3URJUDPP:HWWHUEHVLW]WGLH6FKDOWIOlFKHQ6RQQHQVFKHLQXQG5HJHQ)ROJHQGH(UHLJQLVVH XQG 5HDNWLR QHQVROOHQP JOLFKVHLQ â 'LH6FKDOWIOlFKH5HJHQZLUGDQJHNOLFNW$OV5HDNWLRQZLUGGLH(UHLJQLVSUR]HGXU&PGB5HJHQB&OLFNDE JHDUEHLWHW â 'LH 6FKDOWIOlFKH 6RQQHQVFKHLQ ZLUG DQJHNOLFNW $OV 5HDNWLRQ ZLUG GLH (UHLJQLVSUR]HGXU &PGB6RQQHB&OLFNDEJHDUEHLWHW :HQQNHLQHGHUEHLGHQ6FKDOWIOlFKHQDQJHNOLFNWZLUGZLUGDXFKNHLQH(UHLJQLVSUR]HGXUDXVJHI KUW )DOOV6LHQDFKWUlJOLFKGHQ1DPHQHLQHV2EMHNWHVlQGHUQ]XGHP6LHVFKRQ(UHLJQLVSUR]HGXUHQSURJUDPPLHUW KDEHQP VVHQ6LHGLH1DPHQGHU3UR]HGXUHQDQSDVVHQ Überblick wichtiger Ereignisse $FWLYDWH &KDQJH &OLFN 'EO&OLFN 'HDFWLYDWH 'UDJ'URS 'URS'RZQ (UURU *RW)RFXV.H\'RZQ (LQH)RUPZLUGDNWLYLHUWEHLVSLHOVZHLVHZHQQVLHDQJHNOLFNWZLUG 'HU,QKDOW HLQHV (LQJDEHIHOGHV RGHU GLH 3RVLWLRQ HLQHV %LOGODXIIHOGHV LQ HLQHU %LOGODXIOHLVWH lqghuwvlfk (LQH6FKDOWIOlFKHZLUGDQJHNOLFNWRGHU EHUGLH/HHUWDVWHHLQ2SWLRQVIHOGDNWLYLHUW $XIHLQHP(OHPHQWLQHLQHP/LVWHQIHOGZLUGHLQ'RSSHONOLFNDXVJHI KUW (LQH)RUPZLUGGHDNWLYLHUW]%ZHQQHLQDQGHUHV2EMHNWGHU$QZHQGXQJDQJHNOLFNWZLUG (LQ5DKPHQZLUGJH]RJHQGUDJXQGORVJHODVVHQGURS]%XPLKQ]XYHUVFKLHEHQ (LQ/LVWHQIHOGZLUGDXIJHVFKODJHQ (VZLUGEHLVSLHOVZHLVHYHUVXFKWDXIHLQ'DWHQIHOG]X]XJUHLIHQGDVQLFKWH[LVWLHUW (LQH)RUPZLUG]%GXUFKHLQHQ.OLFNPLWGHU0DXVWDVWHLQGHQ9RUGHUJUXQGJHVWHOOW (LQHEHOLHELJH7DVWHZLUGJHGU FNW

12 Grundlagen der Programmentwicklung 3.H\3UHVV.H\8S /RDG /RVW)RFXV 0RXVH'RZQ 0RXVH0RYH 0RXVH8S 3DWK&KDQJH 5HVL]H 6FUROO 7LPHU 8QORDG (LQHEHOLHELJH7DVWHGHV$6&,,=HLFKHQVDW]HVZLUGJHGU FNW (LQHJHGU FNWH7DVWHZLUGORVJHODVVHQ (LQH)RUPZLUGJHODGHQEHLVSLHOVZHLVHGXUFK6WDUWHQGHU$QZHQGXQJ (LQ%LOGIHOGZLUGLQGHQ+LQWHUJUXQGJHVWHOOW]%ZHQQHLQDQGHUHV2EMHNWDQJHNOLFNWZLUG (LQH0DXVWDVWHZLUGJHGU FNW 'LH0DXVZLUGEHZHJW (LQHJHGU FNWH0DXVWDVWHZLUGORVJHODVVHQ 'HU9HU]HLFKQLVQDPHZLUGJHlQGHUW 'LH*U HHLQHU)RUPlQGHUWVLFK 'DV%LOGODXIIHOGHLQHU%LOGODXIOHLVWHZLUGEHZHJW 'DV=HLWLQWHUYDOOHLQHV=HLWJHEHU6WHXHUHOHPHQWVLVWDEJHODXIHQ (LQH)RUPZLUGJHVFKORVVHQ (LQXQGGDVVHOEH(UHLJQLVNDQQI UYHUVFKLHGHQH2EMHNWHGXUFKXQWHUVFKLHGOLFKH9RUJlQJHDXVJHO VWZHUGHQ %HLVSLHOVZHLVH NDQQ EHL HLQHP &OLFN(UHLJQLV HLQH 0DXVWDVWH DXI HLQH 6FKDOWIOlFKH NOLFNHQ RGHU LQ HLQHP /LVWHQIHOGNDQQPLWGHQ7DVWHQ Î XQG Ï HLQ(OHPHQWDXVJHZlKOWZHUGHQ Codefenster zur Erstellung von Ereignisprozeduren.OLFNHQ6LHGRSSHOWDXIGDV2EMHNW]XGHP6LHHLQH(UHLJQLVSUR]HGXUVFKUHLEHQP FKWHQ :HQQ6LHEHLVSLHOVZHLVH]XHLQHU)RUPHLQH(UHLJQLVSUR]HGXUVFKUHLEHQP FKWHQNOLFNHQ6LH LQQHUKDOEGHV)RUPIHQVWHUVGRSSHOWDXIHLQHOHHUH)OlFKH $OWHUQDWLYHQ$16,&+7&2'(RGHU 'DV&RGHIHQVWHUZLUGJH IIQHW(VHQWKlOWVWDQGDUGPl LJEHUHLWVHLQH3URJUDPPLHUYRUODJHGLHDXVGHP$Q IDQJSubXQGGHP(QGHEnd SubHLQHU(UHLJQLVSUR]HGXUEHVWHKW'D]ZLVFKHQJHEHQ6LHGLH$QZHLVXQJHQ HLQGLHGDV3URJUDPPEHLP(LQWUHWHQGLHVHV(UHLJQLVVHVDXVI KUHQVROO 'HU 1DPH GHU 3UR]HGXU ZLUG EHUHLWV DXWRPDWLVFK KLQWHU GHP:RUW Sub YHUJHEHQ (U EHVWHKW DXV IROJHQGHQ 7HLOHQ Objektname_Ereignis ã ã ã 'HU2EMHNWQDPHLVWGHU1DPHGHQ6LHEHUHLWVLP (LJHQVFKDIWHQIHQVWHUXQWHUGHU(LJHQVFKDIW(Name) YHUJHEHQKDEHQE]ZGHUVWDQGDUGPl LJHLQJHVWHOOW LVW EHLVSLHOVZHLVH Command1 6LH N QQHQ LKQ LP /LVWHQIHOGaDXVZlKOHQ 1DFKHLQHP8QWHUVWULFKVWHKWGDV(UHLJQLVGDV6LH LP/LVWHQIHOGbDXVJHZlKOWKDEHQ 1 2 (UHLJQLVSUR]HGXUHQ HUKDOWHQEHLLKUHU(UVWHOOXQJDXWRPDWLVFKGHQ6WDWXVPrivateGKVLH VLQG GLUHNW PLWHLQHP(UHLJQLVRGHUHLQHP6WHXHUHOHPHQWYHUNQ SIW Notizen

13 3 Visual Basic Grundlagen Programmierung 3.5 Anweisungen eingeben und bearbeiten Anweisungen eingeben.olfnhq6lhlp&rghihqvwhudqglh6whoohdqghu6lhglh$qzhlvxqjhlqjhehqzroohqlpphu ]ZLVFKHQSub ProzedurnameXQGEnd SubXQGJHEHQ6LHGLH$QZHLVXQJHQHLQ 0LW RETURN ZLUGHLQH$QZHLVXQJEHHQGHWXQGLQHLQHQHXH&RGH]HLOHJHVSUXQJHQ 0HKUHUH $QZHLVXQJHQ =HLOHQXPEUXFK 6LFKHUXQJYRQ &RGHWHLOHQ,QHLQHU=HLOHN QQHQPHKUHUH$QZHLVXQJHQQDFKHLQDQGHUHLQJHJHEHQZHUGHQZHQQ VLHPLWJHWUHQQWZHUGHQ 'HU&RGHHLQHU=HLOHZLUGLQGHUQlFKVWHQ=HLOHIRUWJHVHW]WZHQQQDFKHLQHP/HHU]HL FKHQHLQ8QWHUVWULFKBIROJW%HLVSLHO 0HOGXQJ,QGLH9DULDEOH0HOGXQJZLUGHLQ7H[WJHVFKULHEHQXQGQRFKHLQHUB LQGHUQlFKVWHQ=HLOHPLWBXQGGHPNDXIPlQQLVFKHQ81'DQJHKlQJW 'LH(UHLJQLV3UR]HGXUHQJHO VFKWHU6WHXHUHOHPHQWHZHUGHQLP$OOJHPHLQHQ'HNODUDWL RQVWHLODOVEHQXW]HUGHILQLHUWH3UR]HGXUHQJHVSHLFKHUW 6\QWD[&KHFNLQJ -HGHVPDO ZHQQ 6LH GLH DNWXHOOH $QZHLVXQJV]HLOH PLW GHU RETURN 7DVWH GHU 0DXVRGHU EHUHLQHGHU3IHLOWDVWHQYHUODVVHQZLUGGLH=HLOHVRIRUWDXI6\QWD[IHKOHU EHUSU IW 6LH HUKDOWHQ LP )DOOH HLQHU IHKOHUKDIWHQ $QZHLVXQJ HLQ 'LDORJIHQVWHU PLW HLQHP+LQZHLVDXIGDVJHIXQGHQH3UREOHP Codezeilen einrücken 'DPLW,KUH$QZHLVXQJHQ EHUVLFKWOLFKXQGJXWOHVEDUDQJHRUGQHWVLQGN QQHQ6LHHLQ]HOQH=HLOHQRGHU%HUHL FKHGHU3UR]HGXUHLQU FNHQ 3RVLWLRQLHUHQ6LHGHQ&XUVRUDQGHQ$QIDQJGHU&RGH]HLOHXQGEHWlWLJHQ6LHGLH 7DVWH RGHU 5XIHQ6LHGHQ0HQ SXQNW%($5%(,7(1(,1=8*9(5*5g66(51DXI :HFKVHOQ6LHPLW RETURN LQGLHQlFKVWH=HLOHZLUGGLHVHHEHQIDOOVHLQJH]RJHQ8PGHQ(LQ]XJ]XHQW IHUQHQEHWlWLJHQ6LH KORREKTUR RGHUZlKOHQ6LHGHQ0HQ SXQNW%($5%(,7(1(,1=8*9(5./(,1(51 'XUFK.OLFN DXI GLH 6FKDOWIOlFKH 6RQQHQVFKHLQ VROO HLQH (UHLJQLVSUR]HGXU DXIJHUXIHQ ZHUGHQ GLH GDV %LOG 6RQQHHLQXQGGDV%LOG5HJHQDXVEOHQGHW Abb. 3.5 Erstellen einer Ereignisprozedur Aktionen rückgängig machen 'LH]XOHW]WGXUFKJHI KUWH(LQJDEHRGHUGHU]XOHW]WDXVJHI KUWH%HIHKONDQQLP9LVXDO%DVLF(GLWRULQGHQPHL VWHQ)lOOHQZLHGHUU FNJlQJLJJHPDFKWZHUGHQ â â â,p&rghihqvwhun QQHQ6LHGLHOHW]WHRGHUPHKUHUHFRGLHUWH$QZHLVXQJHQU FNJlQJLJPDFKHQ 'LHOHW]WH/ VFKXQJRGHUGHUOHW]WH.RSLHUYRUJDQJNDQQU FNJlQJLJJHPDFKWZHUGHQ,P)RUPIHQVWHUN QQHQ6LH6WHXHUHOHPHQWHZLHGHUKHUVWHOOHQGLH6LHJHUDGHJHO VFKWKDEHQ :lkohq6lhghq0hq SXQNW%($5%(,7(15h&.*b1*,*XPHLQH$NWLRQ]XU FN]XQHKPHQ

14 Grundlagen der Programmentwicklung 3 $OWHUQDWLYHQ STRG Z RGHU 0LWGHP0HQ SXQNW%($5%(,7(1:,('(5+2/(1RGHUGHP6\PERO N QQHQ6LHGHQOHW]WHQ5 FNJlQJLJ %HIHKO ]XU FNQHKPHQ (V ODVVHQ VLFK DXFK PHKUHUH 7H[WYHUDUEHLWXQJVYRUJlQJH ZLHGHUKHUVWHOOHQ ZHQQ 6LH PHKUPDOVKLQWHUHLQDQGHUGHQ%HIHKO%($5%(,7(15h&.*b1*,*DXVJHI KUWKDEHQ 3.6 Ereignisprozeduren ausführen 6REDOG6LHHLQH(UHLJQLVSUR]HGXUSURJUDPPLHUWKDEHQN QQHQ6LHGDV3URJUDPPDXVI KUHQ%HLP$XVI KUHQ GHV3URJUDPPVZHUGHQGLH(UHLJQLVSUR]HGXUHQGDUDXIKLQXQWHUVXFKWREVLHLQLKUHP$XIEDXGHQ6SUDFKUHJHOQ YRQ9LVXDO%DVLFHQWVSUHFKHQ 6LHP FKWHQGHQ3URJUDPPDEODXI VWDUWHQ :lkohq6lhghq0hq SXQNW$86)h+5(167$57(1 $OWHUQDWLYHQ RGHU F5 'DEHL ZLUG QXU GLH DNWXHOOH (UHLJQLVSUR]HGXU NRPSLOLHUW 0 FKWHQ 6LH KLQJHJHQ YRU GHP 6WDUWGDVJHVDPWH3URMHNWNRPSLOLHUHQ :lkohq 6LH GHQ 0HQ SXQNW $86)h+5(1 67$57(1 92//67b1',*(.203,/,(581* $OWHUQDWLYH STRG F5 XQWHUEUHFKHQ :lkohq6lhghq0hq SXQNW$86)h+5(1817(5%5(&+(1 $OWHUQDWLYHQ RGHU STRG PAUSE (LQ7HVWIHQVWHU]XP7HVWHQHLQ]HOQHU$QZHLVXQJHQZLUGHLQJHEOHQGHWYJO $EVFKQLWW EHHQGHQ :lkohq6lhghq0hq SXQNW$86)h+5(1%((1'(1 $OWHUQDWLYH HUQHXWVWDUWHQ :lkohq6lhghq0hq SXQNW$86)h+5(11(867$57(1 $OWHUQDWLYH Ö UMSCHALTEN F5 'HU3URJUDPPODXIZLUGDEJHEURFKHQXQGGDV3URJUDPPZLUGQRFKPDOVJH VWDUWHW Notizen

15 3 Visual Basic Grundlagen Programmierung 6LQGLQHLQHP3URMHNWPHKUHUH)RUPHQHQWKDOWHQPX IHVWJHOHJW ZHUGHQZHOFKH)RUPEHLP6WDUWHQGHV3URJUDPPHV]XHUVWDQ JH]HLJWZLUGYJO$EVFKQLWW 5XIHQ 6LH GHQ 0HQ SXQNW 352-(.7 (,*(1 6&+$)7(19211$0(DXI :lkohq 6LH LP /LVWHQIHOG a GLH JHZ QVFKWH )RUP DXV 1 Erfolgreiches Übersetzen Abb. 3.6 Startform festlegen 1DFKHUIROJUHLFKHUhEHUVHW]XQJNHLQHV\QWDNWLVFKHQ)HKOHUHUVFKHLQWGLH)RUPE]ZGLH%HQXW]HUREHUIOlFKH GLH6LH]XYRUHUVWHOOWKDEHQDOVDXVI KUEDUHV3URJUDPPDP%LOGVFKLUP Fehlerhaftes Übersetzen )DOOV,KU 3URJUDPP E]Z,KUH (UHLJQLVSUR]HGXU QRFK IRUPDOH )HKOHU HQWKlOW ZHUGHQ GLHVH YRP &RPSLOHU IHVWJHVWHOOW 'HU hehuvhw]xqjvodxi ZLUG LQ GLHVHP )DOO DEJHEURFKHQGDV&RGHIHQVWHUDXWRPDWLVFKJH IIQHWXQG GLH6WHOOHGHVDXIJHWUHWHQHQ)HKOHUVPDUNLHUW =XVlW]OLFKHUVFKHLQWHLQHHUOlXWHUQGH)HKOHUPHOGXQJ) K UHQ6LHQDFKGHU)HKOHUEHKHEXQJHLQHQHUQHXWHQhEHUVHW ]XQJVYRUJDQJ GXUFK =X HLQHU DXVI KUOLFKHQ %HVFKUHL EXQJZLH6LH)HKOHUEHKHEHQN QQHQYJO.DSLWHO Testen der Ereignisprozeduren Abb. 3.7 Fehlermeldung 'DV6\VWHPWHVWHW,KU3URJUDPPDXIIRUPDOH.RUUHNWKHLW'LHLQKDOWOLFKH.RUUHNWKHLWP VVHQ6LHVHOEVWSU IHQ 8P,KUHSURJUDPPLHUWHQ(UHLJQLVSUR]HGXUHQ]XWHVWHQI KUHQ6LHGLH(UHLJQLVVHDQGHQMHZHLOLJHQ6WHXHUHOH PHQWHQGXUFKEHLVSLHOVZHLVH.OLFNHQDXIGLH6FKDOWIOlFKHXQGEHREDFKWHQJHQDXGLH5HDNWLRQHQ(QWVSUH FKHQ GLH HLQJHWUHWHQHQ 5HDNWLRQHQ QLFKW GHQ YRQ,KQHQ JHZ QVFKWHQ P VVHQ 6LH GLH $QZHLVXQJHQ GHU (UHLJQLVSUR]HGXUHQlQGHUQXQGHUQHXWWHVWHQ 6WDUWHQ6LHGDV3URJUDPP:HWWHUXQGNOLFNHQ6LHDXIGLH6FKDOWIOlFKHQ$UEHLWHWGDV3URJUDPPNRUUHNWZLUG EHLMHGHP.OLFNGLHHQWVSUHFKHQGH*UDILNDQJH]HLJW6LHZHUGHQDOOHUGLQJVIHVWVWHOOHQGD EHLP6WDUWGHV3UR JUDPPHV]XQlFKVWEHLGH*UDILNHQVLFKWEDUVLQG'XUFKHLQH]XVlW]OLFKH3UR]HGXUN QQHQ6LHGLHVYHUKLQGHUQ.OLFNHQ6LHGRSSHOWDXIGLH)RUP (V ZLUG HLQH 3UR]HGXU I U GDV 6WDQGDUGHUHLJQLV Load GHU)RUPHLQJHI JW 6HW]HQ 6LH I U EHLGH %LOGIHOGHU GLH (LJHQVFKDIW VisibleDXIFalseVRGD EHLP6WDUWHQNHLQHVGHU %LOGHUDQJH]HLJWZLUG

16 Grundlagen der Programmentwicklung Ausführbare Programmdatei erstellen,vw,ku 3URJUDPP IHKOHUIUHL XQG YROOVWlQGLJ N QQHQ 6LHHLQHDXVI KUEDUH3URJUDPPGDWHLHUVWHOOHQ0LWGLH VHU3URJUDPPGDWHLNDQQ,KU3URJUDPPXQWHU:LQGRZV DXFKRKQH9LVXDO%DVLFJHVWDUWHWZHUGHQ'DEHLZHU GHQ DOOH )RUPHQ 0RGXOH XQG =XVDW]VWHXHUHOHPHQWH,KUHV 3URMHNWHV ]X HLQHU HLQ]HOQHQ DXVI KUEDUHQ 3UR JUDPPGDWHL ]XVDPPHQJHI JW GLH GLH 'DWHLHUZHLWH UXQJ(;(HUKlOW 6SHLFKHUQ 6LH,KU IHKOHUIUHLHV 3URMHNW EHU GHQ 0HQ SXQNW '$7(, 352-(.7 63(, &+(51 :lkohq 6LH GHQ 0HQ SXQNW '$7(, 1DPH(;((567(//(1 *HEHQ6LHLP(LQJDEHIHOGHLQHQ1DPHQa I UGLH'DWHLHLQ %HVWlWLJHQ6LHPLW2.RGHU RETURN Abb Eine EXE-Datei erstellen Programm aus dem Explorer von Windows starten giiqhq6lhghq([soruhuyrq:lqgrzvlqghp6lhehlvslhovzhlvhlp6wduwphq DXIGHQ(LQ WUDJ352*5$00(:,1'2:6(;3/25(5NOLFNHQ :HFKVHOQ6LH]XGHP9HU]HLFKQLVLQGHP,KUH3URJUDPPGDWHLJHVSHLFKHUWLVW.OLFNHQ6LHGRSSHOWDXIGHQ'DWHLQDPHQGHV3URJUDPPV7\S$1:(1'81* Paket- und Weitergabe-Assistent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a XQG DNWLYLHUHQ 6LHGDV.RQWUROOIHOGb.OLFNHQ6LHGRSSHOWDXIGHQ(LQWUDJa 'DV 0HQ $'',16 HUKlOW HLQ ]XVlW]OLFKHV 0HQ HOHPHQW EHUGDV6LHGHQ$VVLVWHQWHQVWDUWHQN QQHQ Abb. 3.9 Erstmaliges Starten 2

17 3 Visual Basic Grundlagen Programmierung 'HU3DNHWXQG:HLWHUJDEH$VVLVWHQWZLUGDXWRPDWLVFK DXI GDV JHUDGH JHODGHQH 3URMHNW DQJHZDQGW,VW NHLQ 3URMHNW JHODGHQ HUKDOWHQ 6LH HLQH HQWVSUHFKHQGH 0HO GXQJ,P IROJHQGHQ 'LDORJIHQVWHU N QQHQ 6LH DXV GUHL )XQN WLRQHQ DXVZlKOHQ 'LH )XQNWLRQ 9(53$&.(1 LVW GLH DP KlXILJVWHQ YHUZHQGHWH 'LHVH )XQNWLRQ HUVWHOOW DXV,KUHP 3URMHNW HLQ 3DNHW GDV DOOH ]XU $XVI KUXQJ,KUHU $QZHQGXQJEHQ WLJWHQ'DWHLHQHQWKlOW 3.8 Schnellübersicht Abb Funktion auswählen 6LHP FKWHQ / VXQJ $OWHUQDWLYH HLQQHXHV3URMHNWHUVWHOOHQ HLQ3URMHNW IIQHQ HLQ3URMHNWVSHLFKHUQ HLQ(OHPHQWHLQHV3URMHNWHVXQWHU HLQHPDQGHUHQ1DPHQVSHLFKHUQ HLQ6WHXHUHOHPHQWHLQHU)RUP KLQ]XI JHQ 2EMHNWHLJHQVFKDIWHQIHVWOHJHQ E]ZlQGHUQ HLQH(UHLJQLVSUR]HGXUI UHLQ 2EMHNWVFKUHLEHQ HLQH$NWLRQU FNJlQJLJPDFKHQ HLQ3URJUDPPVWDUWHQ HLQ3URJUDPPEHHQGHQ HLQHDXVI KUEDUH3URJUDPPGDWHL HUVWHOOHQ,KU3URMHNWI UGLH,QVWDOODWLRQDXI HLQHPDQGHUHQ5HFKQHUEHUHLW VWHOOHQ '$7(,1(8(6352-(.7 '$7(,352-(.7g))1(1 '$7(,352-(.763(,&+(51 '$7(,63(,&+(519211DPH817(5 6WHXHUHOHPHQW LQ GHU :HUN]HXJVDPPOXQJ DQNOLFNHQ XQG DXIGHU)RUPDXI]LHKHQ 2EMHNWPDUNLHUHQ$16,&+7(,*(16&+$)7(1)(167(5 2EMHNWPDUNLHUHQ$16,&+7&2'( %($5%(,7(15h&.*b1*,* $86)h+5(167$57(1 $86)h+5(1%((1'(1 '$7(,1DPH(;((567(//(1 $'',163$.(781':(,7(5*$%($66,67( Übung Übung 1 - Erstellen einer Ereignisprozedur %HLP.OLFNHQDXIHLQH6FKDOWIOlFKHVROOLQHLQHU7H[WER[HLQIHVWJHOHJWHU7H[WHUVFKHLQHQ a b ) JHQ6LHHLQHUOHHUHQ)RUPHLQH6FKDOWIOlFKHXQGHLQH7H[WER[KLQ]XXQGSRVLWLRQLHUHQ6LH EHLGH6WHXHUHOHPHQWHKRUL]RQWDO]HQWULHUWDXIGHU)RUP 9HUJHEHQ6LHI UGLH2EMHNWHGHV3URMHNWHVIROJHQGH(LJHQVFKDIWVZHUWH

18 Grundlagen der Programmentwicklung 3 2EMHNW (LJHQVFKDIW :HUW )RUP Caption.OLFN)HQVWHU 7H[WER[ Text >OHHU@ (Name) 7[WB$XVJDEH 6FKDOWIOlFKH Caption.OLFNHQ (Name) &PGB.OLFNHQ c d e f g h i 6SHLFKHUQ6LHGLH)RUPXQGGDV3URMHNWXQWHUGHP1DPHQ.OLFN.OLFNHQ6LHGRSSHOWDXIGLH6FKDOWIOlFKH.OLFNHQ :HFKVHOQ 6LH LP /LVWHQIHOG a QDFKHLQDQGHU ]X GHQ HLQ]HOQHQ2EMHNWHQVRZLHLP/LVWHQIHOGb]XGHQYHU VFKLHGHQHQ(UHLJQLVVHQ ) UMHGHVDXVJHZlKOWH(UHLJQLVZLUGHLQHQHXH3URJUDPPLHUYRUODJHKLQ]XJHI JW 6FKUHLEHQ6LHI UGDV(UHLJQLVClickGHU6FKDOWIOlFKH.OLFNHQIROJHQGH$QZHLVXQJHQ Sub Cmd_Klicken_Click () Txt_Ausgabe.Text = "Ein Klick und schon erscheint der Text" End Sub 6SHLFKHUQ6LHGDV3URMHNWXQGI KUHQ6LHGDV3URJUDPP.OLFNYESDXV (QWKlOW,KU3URJUDPP)HKOHUP VVHQ6LHYHUVXFKHQGLH)HKOHUPLWGHQ,KQHQEHNDQQWHQ.RU UHNWXUIXQNWLRQHQ]XEHKHEHQ) KUHQ6LHGDQQHLQHQHUQHXWHQ3URJUDPPDEODXIGXUFK (UVWHOOHQ 6LH I U GDV 3URMHNW HLQH DXVI KUEDUH 'DWHL.OLFNH[H QDFKGHP HV IHKOHUIUHL EHU VHW]WZXUGH 6WDUWHQ6LHGDV3URJUDPP.OLFNDXVGHP([SORUHUYRQ:LQGRZV 1 2 Übung 2 - Steuerelemente und Eigenschaftenfenster 'DV LQ GHQ QDFKIROJHQGHQ hexqjhq HU]HXJWH 'LDORJIHQVWHU VLHKW HWZD ZLHLQQHEHQVWHKHQGHU$EELOGXQJDXV a giiqhq 6LH GLH )RUP +HOORIUP.DSLWHO?+HOOR?9RUKHU /DVVHQ6LHVLFKGDV(LJHQVFKDIWHQIHQVWHUGD]XDQ]HLJHQ b *HEHQ6LHEHL&DSWLRQGHQ7H[W+HOOR:RUOGXQGEHL1DPH )UPB+HOORHLQ,QGHU7LWHOOHLVWHHUVFKHLQWQXQ+HOOR:RUOG c /HJHQ 6LH IROJHQGH (LJHQVFKDIWHQ I U GLH )RUP IHVW XQG VWDUWHQ6LHMHZHLOVGDV3URMHNW Abb Erstelltes Dialogfenster Notizen

19 3 Visual Basic Grundlagen Programmierung (LJHQVFKDIW 1HXHU:HUW :LUNXQJQDFK6WDUW Visible TrueE]ZFalse 'LH)RUPLVWVLFKWEDUE]ZXQVLFKWEDU Enabled TrueE]ZFalse 'LH)RUPLVWDNWLYE]ZLQDNWLYGKHLQ.OLFNDXI GLH)RUPIOlFKHHU]HXJWHLQHQ:DUQSLHSVHU BackColor $XVZDKODXVGHU)DUESDOHWWH 'LHJHZlKOWH)DUEHZLUGDOV)RUPIDUEHDQJH]HLJW ControlboxVRZLH DXFKMin-Maxbutton TrueE]ZFalse 'DV 6\VWHPPHQ IHOG ZLUG DQJH]HLJW E]Z DXVJH EOHQGHW ShowInTaskbar TrueE]ZFalse 1DFK0LQLPLHUHQGHU)RUPZLUGGLHVHLQGHU7DVN /HLVWHDQJH]HLJWE]ZQLFKWDQJH]HLJW d e f g h i =HLFKQHQ6LHLQGLH)RUPHLQ(LQJDEHIHOG7H[W%R[HLQ 6WDUWHQ6LHGDV3URMHNWDFKWHQ6LHGDUDXIGD 6LHGLH)RUP(LJHQVFKDIWHQYRUKHUZLHGHU]X U FNVWHOOHQ *HEHQ6LHLQGDV(LQJDEHIHOG7H[WHLQXQGEHDUEHLWHQ6LHLKQ %HHQGHQ6LHGHQ3URJUDPPDEODXI 0DUNLHUHQ 6LH GDV (LQJDEHIHOG XP LP (LJHQVFKDIWHQIHQVWHU GHVVHQ (LJHQVFKDIWHQ DQ]X]HL JHQ *HEHQ6LHEHL(Name)7[WB0HOGXQJHLQOHJHQ6LHIROJHQGH(LJHQVFKDIWHQIHVWXQGVWDUWHQ 6LHMHZHLOVGDV3URMHNW (LJHQVFKDIW 1HXHU:HUW :LUNXQJ Text 'DVLVWPHLQHHUVWH7H[WER[ $Q]HLJHGHV7H[WHV Enabled TrueE]ZFalse,P(LQJDEHIHOGHUVFKHLQWGHU&XUVRUXQG HV NDQQ 7H[W HLQJHJHEHQ ZHUGHQ E]Z HV LVW NHLQH (LQ JDEHP JOLFK)HKOHUSLHSVHU Visible TrueE]ZFalse 6LFKWEDUE]ZXQVLFKWEDU Font :lkohq 6LH LP 'LDORJIHQVWHU GLH6FKULIWDUWHWF $Q]HLJHGHU6FKULIWJHPl JHZlKOWHU(LQVWHOOXQJ j k =HLFKQHQ6LHHLQH6FKDOWIOlFKHPLWGHP1DPHQ&PGB0HOGXQJLQGLH)RUPHLQ 7HVWHQ6LHGLH:LUNXQJGHUREHQYHUlQGHUWHQ(LJHQVFKDIWHQ%HDFKWHQ6LHGD 6LHVWDWWGHU (LJHQVFKDIW.TextGLH(LJHQVFKDIW.CaptionYHUlQGHUQP VVHQ Übung 3 - Das Codefenster und die Ereignisprozeduren 1DFK.OLFNDXI&PGB0HOGXQJVROOHLQ'LDORJIHQVWHUPLWGHP7H[W+HOOR:RUOGHUVFKHLQHQ a b c 0DUNLHUHQ 6LH GLH 6FKDOWIOlFKH&PGB0HOGXQJ XQG IIQHQ 6LH GDV&RGH IHQVWHUGXUFK'RSSHONOLFNDXIGLH6FKDOWIOlFKH (VZLUGGLH6WDQGDUGHUHLJQLVSUR]HGXUDQJH]HLJW,P)DOOHGHU6FKDOWIOlFKH LVWGDVGHUHLQIDFKH0DXVNOLFN *HEHQ6LHGHQIROJHQGHQ&RGHHLQ MsgBox "Hello World" 6WDUWHQ6LHGDV3URMHNW 1DFK.OLFNDXIGLH6FKDOWIOlFKHHUVFKHLQWGDVUHFKWVDQJH]HLJWH'LDORJIHQVWHUGDVQDFK.OLFN DXI2.ZLHGHUYHUVFKZLQGHW 1DFK.OLFNDXI&PGB0HOGXQJVROO+HOOR:RUOGLQGHP(LQJDEHIHOG7[WB0HOGXQJHUVFKHLQHQ d *HKHQ6LHZLHGHULQGDV&OLFN(UHLJQLVYRQ&PGB0HOGXQJXQGNRPPHQWLHUHQ6LHGLHREHUH =HLOHDXVGKVHW]HQ6LHHLQ+RFKNRPPDYRUGLH=HLOHPLWGHPMsgBox%HIHKO

20 Grundlagen der Programmentwicklung 3 e f g *HEHQ6LHGHQIROJHQGHQ&RGHHLQ Txt_Meldung.Text = "Hello World" 6WDUWHQ6LHGDV3URMHNW 1DFK.OLFNDXI&PGB0HOGXQJHUVFKHLQWGHU7H[WLP(LQJDEHIHOG =ZHLZHLWHUH6FKDOWIOlFKHQVROOHQHLQJH]HLFKQHWXQGGHUHQ(LJHQVFKDIWHQYHUlQGHUQZHUGHQ h i j =HLFKQHQ6LH]ZHL6FKDOWIOlFKHQHLQYJO$EE*HEHQ6LHI U(Name)&PGB(LQE]Z &PGB$XVXQGI UCaption(LQE]Z$XVHLQ *HKHQ6LHLQGLHVHU5HLKHQIROJHLQGLH&OLFN(UHLJQLVSUR]HGXUHQXQGJHEHQ6LHMHZHLOVHLQ Txt_Meldung.Visible = True Txt_Meldung.Visible = False 6WDUWHQ6LHGDV3URMHNW EHL&PGB(LQ EHL&PGB$XV 'XUFK ZHFKVHOVHLWLJHV.OLFNHQ DXI GLHEHLGHQ 6FKDOWIOlFKHQ ZLUG GDV (LQJDEHIHOG DXV XQG ZLHGHUHLQJHEOHQGHW Übung 4 - Automatische Syntaxüberprüfung ) UGLHVHhEXQJPX GDV2SWLRQVIHOG$8720$7,6&+(Ã6<17$;h%(535h)81*DNWLYLHUWVHLQ(;75$6237,21(1 5HJLVWHU(',725 a b c *HKHQ6LHLQGLH &OLFN3UR]HGXUYRQ &PGB0HOGXQJ XQG HQWIHUQHQ 6LH GLH /HHU]HLFKHQ YRU XQGQDFKGHP 1DFKHLQHP.OLFNLQHLQHQDQGHUHQ&RGHEHUHLFKI JW9LVXDO%DVLFGLHVHDXWRPDWLVFKZLHGHU HLQGHU&RGHZXUGHIRUPDODOVULFKWLJHUNDQQW (QWIHUQHQ6LH GDV OHW]WH $QI KUXQJV]HLFKHQ 9LVXDO %DVLF I JWHV QDFK 9HUODVVHQ GHU =HLOH DXWRPDWLVFKZLHGHUHLQ (QWIHUQHQ6LHGDVHUVWH$QI KUXQJV]HLFKHQ1DFK9HUODVVHQGHU=HLOHIROJWHLQH)HKOHUPHOGXQJ Notizen