Like this is how I did it.. Works just fine.. The only problem I can think of in your code is one of two:
- You missed the calling convention for the WindowProcedure.
- You forgot to pass "this" to CreateWindowEx.
And the code:
#include <windows.h>
class Window
{
public:
Window(LPCTSTR Title, LPCTSTR Class, DWORD dwStyleEx = 0, DWORD dwStyle = WS_OVERLAPPEDWINDOW,
POINT Location = {CW_USEDEFAULT, CW_USEDEFAULT}, int Width = CW_USEDEFAULT,
int Height = CW_USEDEFAULT, HWND Parent = HWND_DESKTOP, HMENU Menu = nullptr);
int Loop();
private:
HWND WindowHandle;
static LRESULT __stdcall WindowProcedure(HWND Hwnd, UINT Msg, WPARAM wParam, LPARAM lParam);
LRESULT RealWindowProcedure(HWND Hwnd, UINT Msg, WPARAM wParam, LPARAM lParam);
};
Window::Window(LPCTSTR Title, LPCTSTR Class, DWORD dwStyleEx, DWORD dwStyle, POINT Location, int Width, int Height, HWND Parent, HMENU Menu)
{
WNDCLASSEX WndClass =
{
sizeof(WNDCLASSEX), CS_DBLCLKS, Window::WindowProcedure,
0, 0, GetModuleHandle(nullptr), LoadIcon(nullptr, IDI_APPLICATION),
LoadCursor(nullptr, IDC_ARROW), HBRUSH(COLOR_BACKGROUND),
nullptr, Class, LoadIcon(nullptr, IDI_APPLICATION)
};
if(RegisterClassEx(&WndClass))
{
WindowHandle = CreateWindowEx(dwStyleEx, Class, Title, dwStyle, Location.x, Location.y, Width, Height, Parent, Menu, GetModuleHandle(nullptr), this);
}
}
LRESULT __stdcall Window::WindowProcedure(HWND Hwnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
Window* Data = nullptr;
switch(Msg)
{
case WM_NCCREATE:
{
CREATESTRUCT* pCreate = reinterpret_cast<CREATESTRUCT*>(lParam);
Data = static_cast<Window*>(pCreate->lpCreateParams);
SetWindowLongPtr(Hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(Data));
break;
}
default:
{
Data = reinterpret_cast<Window*>(GetWindowLongPtr(Hwnd, GWLP_USERDATA));
break;
}
}
return Data ? Data->RealWindowProcedure(Hwnd, Msg, wParam, lParam) : DefWindowProc(Hwnd, Msg, wParam, lParam);
}
LRESULT Window::RealWindowProcedure(HWND Hwnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch(Msg)
{
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(Hwnd, Msg, wParam, lParam);
}
return 0;
}
int Window::Loop()
{
MSG Messages = {nullptr};
ShowWindow(WindowHandle, SW_SHOW);
while(GetMessage(&Messages, nullptr, 0, 0))
{
TranslateMessage(&Messages);
DispatchMessage(&Messages);
}
return Messages.wParam;
}
int main()
{
Window w("TItle", "Class");
return w.Loop();
}