Re: Mysteriously changing variable

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From: Oleg Starodumov (com-dot-debuginfo-at-oleg)
Date: 12/03/04

  • Next message: Illia Baidakov: "Re: So many string types!" 
    Date: Fri, 3 Dec 2004 10:35:20 +0200

    > Actually com dll is the only programing I have done in C++ so I have never
    > used breakpoints. But in the other languages I've used you can only use
    > breakpoints in the IDE. So how do you run the dll in your IDE?
    >

    How to debug a DLL:
    http://msdn.microsoft.com/library/en-us/vccore98/html/_core_methods_for_debugging_dlls.asp

    Then, after you have reproduced the problem again,
    set a data breakpoint on the variable that changes unexpectedly:

    1. Set a normal breakpoint in the function that contains the variable.
    Wait until this breakpoint is hit.

    2. Obtain the address of the variable (e.g. by entering "&l_MyVariable"
    in Watch window).

    3. Open Data tab in Breakpoints window
    (Edit | Breakpoints | Data)

    4. Enter the address of the variable into "Enter the expression to be evaluated" field,
    and enter 4 into "... the number of elements to watch ..." field.

    5. Step through the function and wait until the data breakpoint is hit.
    If it is hit, the debugger can stop at the line that wrote into the variable,
    or on the next line after it.

    Note that after the function with the local variable returns, you should deactivate
    the data breakpoint, because its location on the stack will be reused
    and something else can be stored there, thus triggering the breakpoint again,
    which will be a "false alarm".

    Also compile the DLL with /GZ compiler option.

    Regards,
    Oleg

  • Next message: Illia Baidakov: "Re: So many string types!"

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