On Error Vfp 6
program execution resumes on the line immediately following the line that caused the error. However, if the error-handling procedure includes RETRY, the program line that caused the error is executed again. If the command specifies a procedure to execute when an error occurs, you can use ERROR(), MESSAGE(), LINENO(), and PROGRAM() to pass the error number, the error message, the program line number, and the program name to the procedure. This information can be used to correct the cause of the error. Remarks: When an error occurs during program execution, Visual FoxPro executes the command you specify with ON ERROR. Typically, ON ERROR uses DO to execute an error-handling procedure. Use ON ERROR without a command to restore the default Visual FoxPro error handler. ON ERROR procedures cannot be nested. If ON ERROR is issued within an ON ERROR procedure, the default Visual FoxPro error handler is restored. The last sentence in the above quote (about nested "on error" statements) is untrue, at least in VFP 7. For example, in VFP 7, the following code works: local sPreviousErrorHandler m.sPreviousErrorHandler=on("error") && Save the previous error handler. on error HandleError(m.sPreviousErrorHandler) && If there's an error, call our local error handler. use nonexistent_table && Trip our local error handler. function HandleError(sPreviousHandler) messagebox("Ouch! Returning to previous error handler.") on error &sPreviousHandler endfunc Notice that the "on error" command inside of the "HandleError" function is nested. Even the following, more obviously nested command works: on error on error return && Don't return on the first error, but do on the second one. When in Development Mode, it's always useful to handle errors differently than in Production Mode. In Production Mode, typically your ON ERROR should trigger modal dialog with the error, a suggestion for resolution or to contact the developer, and an OK button (among others). In Development Mode, your ON ERROR should bomb you back into your development environment, or trigger a different custom dialog which includes, at minimum, ok, cancel, and debug buttons. This allows easy access to the environment for debugging errors. There is a nifty lightweight and funct
ProgramadoresIniciar sesiónCorreo: Contraseña: Entrar Recordar sesión en este navegadorRecordar contraseña?Iniciar sesiónCrear cuentaDocumentación y RecursosCursos y ManualesBiblioteca de TemasCódigo FuenteNoticias/ArtículosForos y ConsultasForos de ConsultaChats de prog.Nuevo!!Tablón de NotasDiccionario informáticoProgramadoresProgramadoresOfertas de TrabajoSolicitudes para prog.Lista de CorreoProgramasProgramas/UtilidadesNuestros ProgramasIconos y CursoresPreguntas/RespuestasOtrosUtilidadesColaboradoresEncuestas/EstadísticasContactarLWP » Foros » FoxPro/Visual FoxPro » ¿Cómo se manejan los errores en VFP?? FoxPro/Visual FoxPro - ¿Cómo se manejan los errores en VFP?? VolverNuevo Tema<<>> Vista: arbolcronológico¿Cómo se manejan los errores en http://fox.wikis.com/wc.dll?Wiki~OnError VFP??Novato(24/04/2010 22:22:49)8.478 visitas4 respuestasRE:¿Cómo se manejan los errores en VFP??es_binario(27/04/2010 17:51:52)RE:¿Cómo se manejan los errores en VFP??Novato(28/04/2010 03:04:21)Tratando de entender....Novato(28/04/2010 03:34:35)RE:Tratando de entender....es_binario(28/04/2010 11:18:40) ¿Cómo se manejan los errores en VFP??Publicado por Novato(325 intervenciones) el 24/04/2010 22:22:49Hola a todos los expertos. Aprendí a programar en VFP 6 y siempre utilicé http://www.lawebdelprogramador.com/foros/FoxPro-Visual-FoxPro/1198788-Como-se-manejan-los-errores-en-VFP.html ON ERROR en el archivo MAIN.PRG (es decir, el archivo de arranque) Leí en el foro que se puede utilizar TRY / CATCH / ENTRY pero NO logro entenderlo. Mi pregunta básica es: 1) ¿Hay que usarlo en cada formulario ? ¿ o solamente en el archivo MAIN.PRG? 2) Si tuvieran que resumir lo que va en cada parte del comando ¿cómo lo explicarían? ¡¡Muchas gracias!!Valora esta pregunta0ResponderOtras secciones de LWP con contenido de FoxPro/Visual FoxPro- Código fuente de FoxPro/Visual FoxPro- Cursos de FoxPro/Visual FoxPro- Temas de FoxPro/Visual FoxPro- Chat de FoxPro/Visual FoxProCódigos de FoxPro/Visual FoxPro- Peso de una bascula- Conversor de números a letras- calculadora de precios y beneficio RE:¿Cómo se manejan los errores en VFP??Publicado por es_binario(757 intervenciones) el 27/04/2010 17:51:52El try catch es tan facil como su traducion al español Dice Try (intenta) catch (atrapa el error ) finally(al final has) Bueno y lo debes usar seg
FORUMSFOR COMPUTER PROFESSIONALS Log In Come Join Us! Are you aComputer / IT professional?Join Tek-Tips Forums! Talk With Other Members Be Notified Of ResponsesTo Your Posts Keyword Search One-Click Access To YourFavorite Forums Automated SignaturesOn Your Posts Best http://www.tek-tips.com/viewthread.cfm?qid=1644784 Of All, It's Free! Join Us! *Tek-Tips's functionality depends on members receiving e-mail. By joining https://www.foxite.com/archives/trycatch-for-vfp6-0000405835.htm you are opting in to receive e-mail. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden.Tek-Tips Posting Policies Jobs Jobs from Indeed What: Where: jobs by Link To This Forum! Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.Just copy and paste the BBCode HTML Markdown MediaWiki reStructuredText code below into your on error site. Microsoft: Visual FoxPro Forum at Tek-Tips HomeForumsProgrammersDBMS PackagesMicrosoft: Visual FoxPro Forum Advice on error handling thread184-1644784 Forum Search FAQs Links MVPs Advice on error handling Advice on error handling AlastairP (TechnicalUser) (OP) 11 Apr 11 03:52 I am debugging my first app on the server at work.When I get a minor error, TALK activates and I see this on the active form. If I close that from, the talk is then visible on error vfp on the next form.Is there a way to stop this and reset the talk option? RE: Advice on error handling MikeLewis (Programmer) 11 Apr 11 04:51 Are you saying you want TALK to be active, or that you don't want it?I assume you know that SET TALK ON or OFF controls the setting. And, also, that is it is scoped to the data session. In other words, if each form has its own private data session, you need to SET TALK separately in each form (usually in the Load event).In addition, you can set the form's AllowOutput property to specify whether TALK output goes to the form itself or the main window.If this doesn't answer your question, could you clarify exactly what you want to know.Mike __________________________________Mike Lewis (Edinburgh, Scotland)Visual FoxPro articles, tips, training, consultancy RE: Advice on error handling OlafDoschke (Programmer) 11 Apr 11 05:28 SET TALK ON does not report errors, so I think your mixing several things togther here, AlaistairP.VFP is verbose on command results, eg how many records have been processed. If you turn off the status bar and don't turn off TALK via SET TALK OFF you get messages written on the active form. Mike has given you a solution to that messages, but it's not error messages.For handling errors you can use
TRY-CATCH for VFP6 Rick C. Hodgin TRYCATCH VFP6 Subject: RE: TRY-CATCH for VFP6 Thread ID: 405834 Message ID: 405835 # Views: 47 # Ratings: 0 Version: Visual FoxPro 6 Category: Classes and Objects Date: Saturday, May 10, 2014 6:10:58 PM This message was rated by: Footer Excellent, Victor. You could also change gcTRYOnError to gaTRYOnError[] to allow nesting of TRY()..CATCH() blocks.> I just made this library to allow the use of a "so-called" TRY-CATCH blocks in VFP6. It doesn't work exactly as the real thing, but I think it allows to create a cleaner error-handling code:> > > * The main use of this library is to catch errors when executing a single line of code > * > LOCAL ex > TRY() > command > > IF CATCH(@ex) > MESSAGEBOX(ex.Message + " at " + ex.Procedure) > ENDIF > > ENDTRY() > > > * But it can also be used with a block of lines, by the using of the NOEX() function: > * > LOCAL ex > TRY() > command > IF NOEX() > another-command > ENDIF > IF NOEX() > even-another-command > ENDIF > > IF CATCH(@ex) > MESSAGEBOX(ex.MEssage) > ENDIF > > ENDTRY() > > > > I hope you find it usefull. Here goes the source code:> > > * TRYCACH.PRG > * > PROCEDURE TRY > IF VARTYPE(gcTRYOnError)="U" > PUBLIC gcTRYOnError,goTRYEx > ENDIF > gcTRYOnError = ON("ERROR") > goTRYEx = NULL > ON ERROR tryCatch(ERROR(), MESSAGE(), MESSAGE(1), PROGRAM(), LINENO()) > ENDPROC > > PROCEDURE CATCH(poEx) > IF PCOUNT() = 1 > poEx = goTRYEx > ENDIF > RETURN !ISNULL(goTRYEx) > ENDPROC > > PROCEDURE ENDTRY > IF !EMPTY(gcTRYOnError) > ON ERROR &gcTRYOnError > ELSE > ON ERROR > ENDIF > ENDPROC > > FUNCTION NOEX() > RETURN ISNULL(goTRYEx) > ENDFUNC > > PROCEDURE tryCatch(pnErrorNo, pcMessage, pcSource, pcProcedure, pnLineNo) > goTRYEx = CREATE("Exception") > WITH goTRYEx > .errorNo = pnErrorNo > .Message = pcMessage > .Source = pcSource > .Procedure = pcProcedure > .lineNo = pnLineNo > ENDWITH > ENDPROC > > DEFINE CLASS Exception AS Custom > errorNo = 0 > Message = "" > Source = "" > Procedure = "" > lineNo = 0 > ENDDEFINE > > > /* ---------------------------------- *\
> Victor J Espina S> www.victorespina.com.ve/wiki> "Change is the only constant in the Universe"-----Bes