Getting DLL filename

Is it possible to get the filename of the DLL the current code is in? Of course I could hardcode it but somebody could later change the output filename from "a.dll" to "b.dll" - is it possible to obtain it programatically? Hope the question is clear... I could use the GetModuleFileName function but I then need to get the module handle. Any suggestion? Thanks in advance.

Check out the Toolhelp32 functions. Module32First, ...

sulu

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Originally Posted by Pavel Kotrc

I could use the GetModuleFileName function but I then need to get the module handle. Any suggestion? Thanks in advance.

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The instance handle is being available in 'DllMain()'...simply store this instance so that you can later use it with 'GetModuleFileName()'.... ;)

Quote:

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Originally Posted by Pavel Kotrc

Is it possible to get the filename of the DLL the current code is in? Of course I could hardcode it but somebody could later change the output filename from "a.dll" to "b.dll" - is it possible to obtain it programatically? Hope the question is clear... I could use the GetModuleFileName function but I then need to get the module handle. Any suggestion? Thanks in advance.

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Just wanted to add that if you want to extract only file name, then you can use ::PathFindFileName(..) from the result you getting from ::GetModuleHandle(..)

Cheers

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Originally Posted by Andreas Masur

...simply store this instance so that you can later use it...

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... or use GetModuleHandle(NULL);

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Originally Posted by VladimirF

... or use GetModuleHandle(NULL);

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Passing NULL will always return you handle to the process ( exe ) and not the dll ..

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Originally Posted by kirants

Passing NULL will always return you handle to the process ( exe ) and not the dll ..

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Right, of course. Sorry... :blush:

Quote:

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Originally Posted by Andreas Masur

The instance handle is being available in 'DllMain()'...simply store this instance so that you can later use it with 'GetModuleFileName()'.... ;)

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Quite rare thing (but not impossible) when you cannot rely on DllMain. For example, its code is placed in static library which can be used for dll build. There's no opportunity to obtain module hinstance from outer world.

For this case a man can use one nifty trick:

Code:

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HINSTANCE GetMyInstance()
{
    MEMORY_BASIC_INFORMATION mbi = {0};
    if( VirtualQuery(GetMyInstance, &mbi, sizeof(mbi)) )
    {
        return (HINSTANCE)mbi.AllocationBase;
    }

    return NULL;
}

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Quote:

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Originally Posted by Igor Vartanov

Quite rare thing (but not impossible) when you cannot rely on DllMain. For example, its code is placed in static library which can be used for dll build. There's no opportunity to obtain module hinstance from outer world.

For this case a man can use one nifty trick:

Code:

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HINSTANCE GetMyInstance()
{
    MEMORY_BASIC_INFORMATION mbi = {0};
    if( VirtualQuery(GetMyInstance, &mbi, sizeof(mbi)) )
    {
        return (HINSTANCE)mbi.AllocationBase;
    }

    return NULL;
}

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Browsing through the web, I found this trick too - in a similar fashion:

Code:

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        MEMORY_BASIC_INFORMATION mbi;
        static int dummy;
        TCHAR szFileName[ MAX_PATH ];
        VirtualQuery( &dummy, &mbi, sizeof(mbi) );
        HMODULE hMod = (HMODULE) mbi.AllocationBase;
        GetModuleFileName( hMod, szFileName, sizeof(szFileName) );

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Anyway, thanks a lot! :wave:

Actually it doesn't matter who gave you the idea, me or anybody else - the main thing is you've got it. And you're welcome. :)