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Thread: ByRef ByVal Discrepancy

  1. Mar 22nd, 2004, 09:29 PM #1
    EZapps
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    ByRef ByVal Discrepancy

    Not sure about this. According to VB5 Online help...

    ByRef Optional. Indicates that the argument is passed by reference. ByRef is the default in Visual Basic.

    According to Microsoft Website...

    ByVal is default.

    Which should I believe?
    Last edited by EZapps; Mar 22nd, 2004 at 09:32 PM.
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  2. Mar 22nd, 2004, 09:32 PM #2
    BuggyProgrammer
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    byref is default.

    What link did it say either? (ie: post both links)
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  3. Mar 22nd, 2004, 09:37 PM #3
    Shawn N
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    If you're creating your fuctions, you should explicitly declare whether variables are passed ByRef or ByVal. It's a good habit to keep the guess work out.
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  4. Mar 22nd, 2004, 09:45 PM #4
    EZapps
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    Check this link...

    http://msdn.microsoft.com/library/de...l/vastmsub.asp
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  6. Mar 22nd, 2004, 09:48 PM #5
    BuggyProgrammer
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    you were looking at .NET documentation.
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  7. Mar 22nd, 2004, 09:49 PM #6
    EZapps
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    Shawn

    Thanks. I agree... especially since there seems to be a lot of discrepency within Microsoft itself.
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  8. Mar 22nd, 2004, 09:53 PM #7
    EZapps
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    Buggy

    That brings up a good point. If the default values change (as per MS whim) and we don't explicitly declare ByRef or ByVal, will our software fail???
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  9. Mar 22nd, 2004, 10:02 PM #8
    EZapps
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    To further explain...

    Please correct me if I'm wrong, as I am quite often. My understanding is that once compiled, the software is converted to machine language... subordient to the machine and operating system it resides on.

    If, by default, that operating system assumes ByVal (when not explicitly declared), what guarantees do I have that my program (written and compiled with VB5) will work on Windows 2003?
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  11. Mar 22nd, 2004, 10:19 PM #9
    Shawn N
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    Your OS has nothing to do with how variables are passed, in respect to BV or BR. Your software will more than likely either fail or product bad output if you meant to pass BV but passed BR or vice versa.

    I really really advise explicitly labeling your function decleration's parameters with either BV or BR.
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  12. Mar 22nd, 2004, 10:23 PM #10
    EZapps
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    Thanks Shawn...

    Your advice is well heeded. In the future, I'll pay more attention and leave less to chance.
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  13. Mar 22nd, 2004, 10:26 PM #11
    EZapps
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    Oh... Thanks to you also Buggy...

    Your advice always seems solid!
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