How to close DLL window before process gets detached

[mgoppelt]

Hello,

I have a DLL

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch(ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
inj_hModule = hModule;
break;
/*case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
break;*/
}

return TRUE;
}

which starts a thread

if(hThread == NULL) hThread=CreateThread(0, NULL, ThreadProc, NULL, NULL, NULL);

which creates a window

WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = inj_hModule;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = "snapzWindowClass";
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc)) return 0;

hWnd = CreateWindowEx(
WS_EX_CLIENTEDGE,
"snapzWindowClass",
"vfwmex",
WS_OVERLAPPEDWINDOW,
0, 0,
capture_w, capture_h,
NULL, NULL, inj_hModule, NULL);
if(hWnd == NULL) return 0;

. Sending the WM_CLOSE message works fine

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CLOSE:
capPreview(hWndCap, FALSE);
capDriverDisconnect(hWndCap);
DestroyWindow(hWndCap);
DestroyWindow(hWnd);
hThread = NULL;
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, msg, wParam, lParam);
}

return 0;
}

. But how do I close the window/terminate the thread before the process gets detached from the DLL? Sending the WM_CLOSE message on DLL_PROCESS_DETACH didn't have the desired effect.

[Alex F]

Dll must have exported functions/classes. Define some function (or class method) which makes all necessary cleanup. If Dll client doesn't call this function when it is necessary, Dll cannot cleanup its resources properly. Anyway, in the end of the process everything is destroyed.

[mgoppelt]

Thank you for the hint! The DLL is used by Matlab, it needs to export this function

http://amath.colorado.edu/computing/...me=mexFunction

and register the cleanup function:

http://amath.colorado.edu/computing/...it.html#175175

Thanks again!