[C++] [Snippet] Empty WinAPI Window

[Charles]

This is the code for an empty WinAPI window in C++. There is also the code to make it open in the center of your screen.

#include <Windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void CenterWindow(HWND);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    MSG msg;
    WNDCLASS wc = {0};
    wc.lpszClassName = TEXT("Centered Window");
    wc.hInstance = hInstance;
    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wc.lpfnWndProc = WndProc;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    RegisterClass(&wc);
    CreateWindow(wc.lpszClassName, TEXT("Centered Window"), WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 500, 400, NULL, NULL, hInstance, NULL);

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

    return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_CREATE:
            {
                CenterWindow(hwnd);
                break;
            }
        case WM_DESTROY:
            {
                PostQuitMessage(0);
                break;
            }
    }

    return DefWindowProc(hwnd, msg, wParam, lParam);
}

void CenterWindow(HWND hwnd)
{
    RECT rc;
    
    GetWindowRect(hwnd, &rc);

    SetWindowPos(hwnd, 0, (GetSystemMetrics(SM_CXSCREEN) - rc.right) / 2, (GetSystemMetrics(SM_CYSCREEN) - rc.bottom) / 2, 0, 0, SWP_NOZORDER | SWP_NOSIZE);
}

Enjoy.