First Windows Program

```bash .\FirstWindowsProgram.exe

g++ -o FirstWindowsProgram FirstWindowsProgram.cpp -lgdi32 -luser32 first windows program

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) if (msg == WM_DESTROY) PostQuitMessage(0); return 0; return DefWindowProc(hwnd, msg, wParam, lParam); ```bash

if (hwnd == NULL)

// Register the window class WNDCLASSEX wc = 0 ; wc.cbSize = sizeof(WNDCLASSEX); wc.style = 0; wc.lpfnWndProc = WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1); wc.lpszMenuName = NULL; wc.lpszClassName = g_szClassName; wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); wc.cbSize = sizeof(WNDCLASSEX)

: The WndProc function is a callback function that handles messages for our window. It takes four parameters: