C / C++ / MFC

Stephen Hewitt wrote:

In the example above you should use static_cast<derivedclass*>(pBaseClass)

hwndThis = CreateWindowEx<br />
(<br />
	NULL,<br />
	sClassName, //Was previously registered via RegisterClassEx. Very standard.<br />
	sClassName,<br />
	WS_POPUP | WS_VISIBLE,<br />
	0,<br />
	0,<br />
	W, //Assume 100x100 window.<br />
	H,<br />
	NULL,<br />
	NULL,<br />
	hHost, //Some valid handle to another window (the one which called this code).<br />
	NULL<br />
);

<br />
hwndControl = CreateWindowEx //Creating the window.<br />
(<br />
	NULL,    //ExStyles.<br />
	"Static",    //Class name.<br />
	Text,    //Text of the label.<br />
	lStyle,    //Styles. =  WS_CHILD | WS_VISIBLE<br />
	0,    //X.<br />
	0,    //Y.<br />
	0,    //Width.<br />
	0,    //Height.<br />
	hwndThis,    //Parent, the one created before...<br />
	NULL,    //Menu.<br />
	(HINSTANCE)hwndThis,    //Parent, the one created before.<br />
	NULL    //CreateStruct.<br />
);

<br />
hwndControl = CreateWindowEx //Creating the window.<br />
(<br />
NULL, //ExStyles.<br />
"Static", //Class name.<br />
Text, //Text of the label.<br />
lStyle, //Styles. = WS_CHILD | WS_VISIBLE<br />
0, //X.<br />
0, //Y.<br />
100, //Width.<br />
100, //Height.<br />
hwndThis, //Parent, the one created before...<br />
NULL, //Menu.<br />
(HINSTANCE)hwndThis, // <---This should be a HINSTANCE, not a HWND cast to a HINSTANCE<br />
NULL //CreateStruct.<br />
);<br />

HINSTANCE g_hInstance;

BOOL WINAPI DllMain(
  HINSTANCE hinstDLL,
  DWORD fdwReason,
  LPVOID lpvReserved
)
{
    if ( fdwReason == DLL_PROCESS_ATTACH )
    {
        g_hInstance = hinstDLL; // Stash it.
    }
}

int WinMain(      
  HINSTANCE hInstance,
  HINSTANCE hPrevInstance,
  LPSTR lpCmdLine,
  int nCmdShow
)
{
        g_hInstance = hInstance; // Stash it.
}

Axonn Echysttas wrote:

1. So I can specify NULL for all of these?

Axonn Echysttas wrote:

2. But still, how can I get the HINSTANCE of a window that I created using CreateWindowEx using a simple class that I created too using RegisterClassEx.

/* Types use for passing & returning polymorphic values */<br />
typedef UINT WPARAM;<br />
typedef LONG LPARAM;<br />
typedef LONG LRESULT;

Blake Miller wrote:

but the WPARAM used to get trunated to the lower 16 bits when it passed through some message filters

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