Getting DLL filename

[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.

[mistersulu]

Check out the Toolhelp32 functions. Module32First, ...

sulu

[Andreas Masur]

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

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

[golanshahar]

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.

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

[VladimirF]

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

... or use GetModuleHandle(NULL);

[kirants]

... or use GetModuleHandle(NULL);

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

[VladimirF]

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

Right, of course. Sorry...

[Igor Vartanov]

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

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:

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

    return NULL;
}

[Pavel Kotrc]

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:

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

    return NULL;
}

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

	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) );

Anyway, thanks a lot!

[Igor Vartanov]

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.