Error Handling Vb6 Function
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Database Guide User login Username: * Password: * Request new password Home › Tutorials Error Handling In Visual Basic Level: Despite your best efforts to cover all possible contingencies, run-time errors will occur in your applications. You can and should vb6 error handling example do all you can to prevent them, but when they happen you have to handle
Vb6 Throw Error
them. Introduction Trapping Errors at Run-Time Building Error Handlers Raising Your Own Errors Summary Introduction The various functions, statements, properties and methods error handling visual basic 6 available in Visual Basic and the components used in Visual Basic expect to deal with certain types of data and behavior in your applications. For example, the CDate() function can convert a value to a Date variable. error handling c# The function is remarkably flexible in the type of information it can accept, but it expects to receive data that it can use to derive a date. If you provide input that it can't convert, it raises error number 13 - "Type mismatch" - essentially saying "I can't handle this input data." In an application, this type of error may be a program logic error (you simply passed the wrong data) or it may
Visual Basic 2005 Error Handling
be a data entry error on the part of the user (you asked for a date and the user typed a name). In the first case, you need to debug the program to fix the mistake. However, there is no way for you to anticipate the behavior of the end users of the application. If the user enters data you can't handle, you need to deal with the situation. Dealing with errors at run-time is a two step process: Trap the Error Before you can deal with an error, you need to know about it. You use VB's On Error statement to setup an error trap. Handle the Error Code in your error handler may correct an error, ignore it, inform the user of the problem, or deal with it in some other way. You can examine the properties of the Err object to determine the nature of the error. Once the error has been dealt with, you use the Resume statement to return control to the regular flow of the code in the application. In addition to dealing with run-time errors, you may at times want to generate them. This is often done in class modules built as components of ActiveX server DLLs or EXEs. It is considered good programming practice to separate the user interface from the program logic
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Visual Basic 6.0 Error Handling
Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign http://www.vb6.us/tutorials/error-handling up what is the better way to handle errors in VB6 up vote 12 down vote favorite 6 I have VB6 application , I want to put some good error handling finction in it which can tell me what was the error and exact place when it happened , can anyone suggest the good way to do this vb6 error-handling share|improve this http://stackoverflow.com/questions/116289/what-is-the-better-way-to-handle-errors-in-vb6 question edited Sep 22 '08 at 17:36 Onorio Catenacci 9,01575386 asked Sep 22 '08 at 17:34 RBS 1,29692330 I removed the "in" tag. –Onorio Catenacci Sep 22 '08 at 17:36 I also changed the two separate "error" and "handling" tags to "error-handling" –Onorio Catenacci Sep 22 '08 at 17:37 add a comment| 7 Answers 7 active oldest votes up vote 2 down vote accepted ON ERROR GOTO and the Err object. See this discussion. share|improve this answer answered Sep 22 '08 at 17:42 Joe Skora 8,97342430 add a comment| up vote 27 down vote First of all, go get MZTools for Visual Basic 6, its free and invaluable. Second add a custom error handler on every function (yes, every function). The error handler we use looks something like this: On Error GoTo {PROCEDURE_NAME}_Error {PROCEDURE_BODY} On Error GoTo 0 Exit {PROCEDURE_TYPE} {PROCEDURE_NAME}_Error: LogError "Error " & Err.Number & " (" & Err.Description & ") in line " & Erl & _ ", in procedure {PROCEDURE_NAME} of {MODULE_TYPE} {MODULE_NAME}" Then create a LogError function that logs the error to disc. Next, before you rele
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us http://stackoverflow.com/questions/14348215/how-to-pass-error-back-to-calling-function Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to pass error back to calling function? up vote 0 down vote favorite What is the best way in VB6 to pass an error back to the calling function? 1 On Error Resume Next 2 ' do something 3 If Err.Number <> 3026 error handling Or Err <> 0 Then ????????? How would you send the error in Line 3 back to the calling function? Is the following the only way to achieve this? errNum = Err.Number On Error Goto 0 Err.Raise errNum vb6 error-handling share|improve this question edited Jan 16 '13 at 9:47 asked Jan 15 '13 at 22:35 CJ7 4,95832112219 add a comment| 4 Answers 4 active oldest votes up vote 1 down vote Use On Error GoTo and re-raise the error in the handler with Err.Raise. Private visual basic 6 Function DoSomething(ByVal Arg as String) On Error GoTo Handler Dim ThisVar as String Dim ThatVar as Long ' Code here to implement DoSomething... Exit Function Handler: Err.Raise Err.Number, , "MiscFunctions.DoSomething: " & Err.Description End Function You'll then be able to get the error number and description in the caller via Err.Number and Err.Description. If the caller is also using On Error GoTo, you'll see them in the handler there. If the caller is using On Error Resume Next, then you can still use those same variables inline. I prefer the first option, using On Error Goto in all functions and subs, because it seems like the natural way to use VB6's built-in error raising features. You can also update the description in the called function's handler, like the example above, and get a pseudo call stack you can eventually log or display to yourself during debugging. More VB6 error handling thoughts here: Is it possible to retrieve the call stack programmatically in VB6? How to clean up error handling in a function? share|improve this answer edited Jan 16 '13 at 14:35 answered Jan 16 '13 at 13:47 JeffK 2,39121524 add a comment| up vote 0 down vote Why not add ByRef errorCode as Long to the called function's args and set it equal to Err.Number after ' do something Or you could have a public field called ErrorCode as Long that you could set after ' do something I have worked with a lot of industrial control APIs and both of these m