Application.ExeName in a DLL

Posted on 2004-11-01
Last Modified: 2010-05-18
Can I just confirm that calling Application.ExeName WILL return the calling application's name, rather than the DLL? This is for 95/98/ME/XP/2k - if any of these work differently, please say so. This is something I want, I don't need the DLL's name.


Geoff M.
Question by:gmayo
    LVL 17

    Accepted Solution

    Yes, I think. You'll have to add 'Forms' to the uses clause of the DLL unit, of course, because Application is defined there. The same result for either static or dynamic linking.

    Regards, Geo
    LVL 17

    Assisted Solution

    by:Wim ten Brink
    Application.Exename will call ParamStr(0). If you call the DLL from a Delphi application then this will return the name of the executable. However, this isn't always guarantueed! Normally you would use
      NameBuffer: array[0..MAX_PATH] of char;
      Filename: string;
      GetModuleFileName(HInstance, NameBuffer, MAX_PATH);
      Filename := NameBuffer;

    but this will return the DLL name, not the executable name. But if you use MainInstance instead of HInstance then you use the instance of the executable. Thus:
      GetModuleFileName(MainInstance, NameBuffer, MAX_PATH);
    should return the executable name in the NameBuffer variable.

    But in general you could also use ParamStr(0) in almost all cases. There might be some special occasions where it won't work but those are quite rare.
    LVL 2

    Expert Comment

    If you use pacages, then the dll and exe will share the same forms object, and hence the same application object.
    LVL 8

    Author Comment

    Okay, so what happens if the DLL is called by a C++ app? Will it work the same way?

    Geoff M.
    LVL 17

    Expert Comment

    by:Wim ten Brink
    Geoff, it should work and in general it will work. The only problems I've discovered in the past were COM objects inside a DLL that took rundll.exe as executable name instead of the executable that was really calling them. And I once had a problem with some scripting engine that allowed you to call methods from a DLL but this engine would link the wrong executable to the DLL. But in general, a plain, simple DLL should work just fine with ParamStr(0)...

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