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 用Windows API实现一个自定义窗口也需要这么一大堆最基本的程序框架：

#include <windows.h>static LPCTSTR lpszAppName = "windows API 窗口示例";//窗口名称HBRUSH hBlueBrush, hRedBrush;//画刷句柄//响应消息的回调函数
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);//程序的入口
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {MSG            msg;//消息结构WNDCLASS       wc;//窗口类型结构HWND           hWnd;//窗口句柄//创建蓝色和红色画刷用以填充操作hBlueBrush = CreateSolidBrush(RGB(0, 0, 255));hRedBrush = CreateSolidBrush(RGB(255, 0, 0));//定义窗口类型wc.style = CS_HREDRAW | CS_VREDRAW;wc.lpfnWndProc = (WNDPROC)WndProc;wc.cbClsExtra = 0;wc.cbWndExtra = 0;wc.hInstance = hInstance;wc.hIcon = NULL;wc.hCursor = LoadCursor(NULL, IDC_HAND);//使用蓝色画刷填充窗口背景wc.hbrBackground = hBlueBrush;wc.lpszMenuName = NULL;wc.lpszClassName = lpszAppName;//注册该窗口类型if (RegisterClass(&wc) == 0)return false;//创建应用程序主窗口hWnd = CreateWindow(lpszAppName,lpszAppName,WS_OVERLAPPEDWINDOW,100, 100,550, 550,NULL,NULL,hInstance,NULL);//如果窗口创建失败，退出程序if (hWnd == NULL)return false;//显示窗口ShowWindow(hWnd, SW_SHOW);UpdateWindow(hWnd);//启动消息循环，直到窗口被关闭while (GetMessage(&msg, NULL, 0, 0)) {TranslateMessage(&msg);//分发消息至相应的窗口的消息处理回调函数DispatchMessage(&msg);}//程序结束前释放GDI资源DeleteObject(hBlueBrush);DeleteObject(hRedBrush);return msg.wParam;
}LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {switch (message) {//程序结束case WM_DESTROY:PostQuitMessage(0);break;case WM_PAINT: {PAINTSTRUCT ps;HBRUSH hOldBrush;//开始绘图BeginPaint(hWnd, &ps);//选用红色刷为当前画刷hOldBrush = HBRUSH(SelectObject(ps.hdc, hRedBrush));//绘制一个矩形，用当前的红色画刷填充背景Rectangle(ps.hdc, 100, 100, 300, 300);//恢复以前的画刷状态SelectObject(ps.hdc, hOldBrush);//结束绘制EndPaint(hWnd, &ps);}break;default://将未处理的消息交与Windows默认的处理函数处理return(DefWindowProc(hWnd, message, wParam, lParam));}return(0L);
}