lpClassName
shouldn’t be NULL
. Register class using RegisterClassEx
function and pass it to CreateWindowEx
.
static const char* class_name = "DUMMY_CLASS";
WNDCLASSEX wx = {};
wx.cbSize = sizeof(WNDCLASSEX);
wx.lpfnWndProc = pWndProc; // function which will handle messages
wx.hInstance = current_instance;
wx.lpszClassName = class_name;
if ( RegisterClassEx(&wx) ) {
CreateWindowEx( 0, class_name, "dummy_name", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL );
}