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' WARNING: BE VERY CAREFUL with any code that is written here as ' This is also done later, but I think putting it here reduces the likelyhood of a coder accidentally removing it. ' Re-instates the procedure's generic error handler Do you want to raise an error in the try block? - (PRESS CTRL+BREAK now then choose YES, try no later.)", vbYesNo) Then ' This next line causes execution to "jump" to the "catch" block in the event an error is detected. ' Perhaps lots of statements and code here ' This line puts in place the defualt error handler found at the very foot of the procedure ' However,sometimes using this technique makes code more readable or simpler! ' (ie I refer to the code below that is surrounded by the tag #OWNSUB). ' It is sometimes better to NOT use this technique but to put the code in it's own procedure ' Example of a multiple line TRY block with a Case statement used to CATCH the error ' (When a break is active, by moving the next executable line onto it, and using step over, it moves the exection point to the line that actually raised the error) ' Note the next line never gets excuted, but I like to have resume in the code for when I am debugging. , ManageErrSource("MyModuleName", Err.Source, Erl(), "tsub1_RaisesProcedureNotFoundError") _ ' and store the name of the procedure that FIRST raised the error. ' I include the procedure ManageErrSource as an exmple of how Err.Source can be used to maintain a call stack of procedure names ' Just the Err.raise below is used for all other errors ' perhaps resulting in a exit sub with no error or ' You might want to do special error handling for some predicted error numbers ' and itself will raise an error "Invalid procedure call or argument" indicating that 0 cannot be used to raise and error! ' However if it does still allow the Err.raise to execute below. ' This shold never happen as this code is an error handler! ' SubProcedure1 has the example of a multiple line TRY block with a block of code executed in the event of an error Private Sub ClearRememberedErrorObjectValues() ' Using Err.Clear (or "On Error GoTo -1 ") gets around this and facilitates the whole TRY CATCH block scenario I am using there. ' will actually NOT pass execution to the ALabel: label BUT the error is paseed to the procedure that called this procedure. ' If Err.Clear has not be used, then the next "On Error GoTo ALabel" that is used in this or the procedure that called it
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' Err.Clear is used to clear the raised exception and set the err object to nothing (ie err.number to 0) ' so that the same error can be re-raised ' Note that the next line will reset the error object to 0, the variables above are used to remember the values ' This function has to be declared in the same scope as the variables it refers to Private Sub RememberThenClearTheErrorObject() Also of interest might be the procedure ManageErrSource which makes the Err.Source property store the procedure where the error occurred. I use the above techniques with various labels to simulate the sometimes useful functionality that Visual basic TRY CATCH blocks give, which I think have their place in writing readable code.Īdmittedly this technique creates a few more lines of code than a nice VB try catch statement, but it's not too messy and pretty easy to get your head around.
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So therefore it is mostly best to use: On Error Goto -1Īs using Err.clear You would often need to write Err.Clear Ie Err.Clear removes an "On Error Goto" that is currently in place. (NOTE that On Error Goto 0 is different from the above)Īlso important to note is that Err.Clear resets it to zero but it is actually equivalent to: On Error Goto -1 On Error Goto -1 ' Which I think is less clear! You can stop a procedure being in the "I'm handling an error" state by clearing the exception (setting err to nothing so the err.number property becomes 0) by using Err.clear When it is in this state, if another "On Error Goto" label2 statement is executed it will NOT goto label2, but raises and error which is passed to the code that called the procedure. When you use on error goto Label1 the procedure enters into a state of "I'm handling an error" as an exception has been raised. (It works but I'm interested to know what other people make of it and for any suggestions you might like to make.) The code below is pretty self explanatory: just copy and paste it all into a module and run it, it provides a few use cases and many explanatory comments in the text.