Thread: Easiest what to get a windows handle with just the filename?

  1. #1
    Has a Masters in B.S.
    Join Date
    Aug 2001

    Easiest what to get a windows handle with just the filename?

    is there an easy way to get the main windows handle(it only uses one), by just knowing the programs filename?
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  2. #2
    &TH of undefined behavior Fordy's Avatar
    Join Date
    Aug 2001
    Weird request...!!!

    I had a few tries at this, and it appears there would be more than 1 way to do this.....
    GetWindowModuleFileName() looked like a winner, but for some reason I couldnt get it to do what I wanted.....Also I realised my old version of the SDK is starting to become a pain in the arse......but that's another story....

    Anyway...not perfect by a long shot, but it seems to produce something....

    #include <windows.h>
    #include <iostream>
    #include <cstring>
    using namespace std;
    /*My PSAPI lib seems to be I had to 
    link to GetModuleFileNameEx at runtime*/
    char exefile[] = "C:\\WINNT\\System32\\calc.exe";
    //The exe of your choice....
    BOOL CALLBACK EnumWindowsProc(HWND hwnd,LPARAM lParam){
    	GMFNE lpGMFNE = (GMFNE)lParam;
    	/*Entry point to the GetModuleFileNameEx func*/
    	DWORD dwPID,//Process ID
    		  dwBytes;//Bytes returned
    	HANDLE hProc;//Process Handle
    	HMODULE hMod;//Module Handle
    	char buff[MAX_PATH];//Buffer
    	hMod = (HMODULE)GetWindowLong(hwnd,GWL_HINSTANCE);
    	//Get the module for the window
    	//Also the Process ID
    	hProc = OpenProcess(PROCESS_ALL_ACCESS,FALSE,dwPID);
    	//Now use that ID to get Process handle
    	if(hProc && hMod){
    		dwBytes = lpGMFNE(hProc,hMod,buff,MAX_PATH);
    			buff[dwBytes] = NULL;
    			if(!strcmp(exefile,buff))//Is it from calc.exe?
    				cout << "Found HWND - " << hwnd << endl;
    	return TRUE;
    int main(void){
    	HMODULE hMod;
    	hMod = LoadLibrary("PSAPI.dll");
    		cout << "PSAPI.dll not present";
    		return 1;
    	lpGMFNE = (GMFNE)GetProcAddress(hMod,"GetModuleFileNameExA");
    		cout << "Could not locate procedure";
    		return 1;
    	return 0;
    This uses the PSAPI.dll which is an addon to WINNT ( need NT at least for this prog as it deals with processes and stuff - there's a shock! )...this dll is usually in the system32 dir as loads of apps ship it & install it.....

    The code is messy, and there is probably a better way, but it might do with some tidying up.

  3. #3
    Registered User
    Join Date
    May 2002
    Hmmm... how does the program know its own filename?

    Did you know that any windows process has a handle to itself? It's easy enough to get that:

    char szFileName[MAX_PATH];
                HINSTANCE hInstance = GetModuleHandle(NULL);
                GetModuleFileName(hInstance, szFileName, MAX_PATH);
                MessageBox(hwnd, szFileName, "This program is:", MB_OK | MB_ICONINFORMATION);
    You don't even need to know the filename.

    This code here actually finds the program pathway too but it does it by first getting the handle, i.e.

    HINSTANCE hInstance = GetModuleHandle(NULL);

    Tell me how that goes.

  4. #4
    Has a Masters in B.S.
    Join Date
    Aug 2001
    thanks fordy, looks good.

    i'll try it soon.

    the only real change think would help

    is using strstr() to find the filename without the path since that can change.

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