API - Create window help

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B+man

Not sure if this is much use:-

LRESULT APIENTRY WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 
{ 
    PAINTSTRUCT ps; 
    HDC hdc; 
 
    switch (message) 
    { 
        case WM_PAINT: 
            hdc = BeginPaint(hwnd, &ps); 
            TextOut(hdc, 0, 0, "Hello!", 15); 
            EndPaint(hwnd, &ps); 
            return 0L; 

        // Process other messages.  
    } 
} 
 
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) 
{ 
    HWND hwnd; 
 
    hwnd = CreateWindowEx( 
        // parameters 
        ); 
 
    ShowWindow(hwnd, SW_SHOW); 
    UpdateWindow(hwnd); <--- Call this if you want to update your window!
 
    return msg.wParam; 
}

Basically, you call a WinAPI (GDI) function called UpdateWindow(hWnd), this sends a WM_PAINT event to your call back function, then you can draw your updated window again!

Dabz