Thread: Showing a window from inside a DLL

im trying to show a window from inside of a dll and i am doing it like this

Code:

int WINAPI CreateWindows(HINSTANCE , HINSTANCE , LPSTR , int);

Global^

Code:

CreateWindows(GetModuleHandle(0), NULL, NULL , NULL);

^calling from a certain part of the dll

Code:

int WINAPI CreateWindows(HINSTANCE hInstance, HINSTANCE hPrevInstance , LPSTR szCmdLine, int iCmdShow)
{
	char szAppName[] = "tabs";

	MSG msg;
	WNDCLASSEX wc;

	TCITEM tabs;
	INITCOMMONCONTROLSEX iccx;

	wc.style = CS_DBLCLKS;
	wc.lpfnWndProc = WndProc;
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hbrBackground = CreateSolidBrush(GetSysColor(COLOR_3DFACE));
	wc.hIcon = LoadIcon(NULL , IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL , IDC_ARROW);
	wc.lpszClassName = szAppName;
	wc.lpszMenuName = NULL;

	if(!RegisterClassEx(&wc)) MessageBox(0 , "Error" , "error" , 0);

	iccx.dwSize = sizeof(INITCOMMONCONTROLSEX);
	iccx.dwICC = ICC_TAB_CLASSES;
	InitCommonControlsEx(&iccx);

	hwnd = CreateWindowEx(0 , szAppName , "Logs" ,
				WS_OVERLAPPEDWINDOW ,
				CW_USEDEFAULT , CW_USEDEFAULT,
				CW_USEDEFAULT , CW_USEDEFAULT,
				NULL , NULL , hInstance , NULL);

	hwndTab = CreateWindowEx(0 , WC_TABCONTROL , NULL,
				WS_VISIBLE | WS_CHILD | TCS_FIXEDWIDTH ,
				0 , 0 , 0 , 0 ,
				hwnd , 
				NULL , 
				(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), 
				NULL);

	UpdateWindow(hwnd);
	ShowWindow(hwnd , SW_SHOW);

	ZeroMemory(&tabs, sizeof(TCITEM));

	tabs.mask=TCIF_TEXT;
	tabs.pszText= "Log";
	tabs.cchTextMax = strlen(tabs.pszText);
	SendMessage(hwndTab, TCM_INSERTITEM, 0, (LPARAM)&tabs);

	tabs.pszText = "Proccessed Packets";
	tabs.cchTextMax = strlen(tabs.pszText);
	SendMessage(hwndTab, TCM_INSERTITEM, 1, (LPARAM)&tabs);
	SendMessage(hwndTab, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), 0);

	while(GetMessage(&msg , NULL , 0 , 0)){
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

the function to do the rest^

the problem is it is not registering the window class, does any one know why this is, im thinking it is because i am using NULL's in the function parameters but i couldnt think of another way,

thanks