利用WindowsAPI创建窗体(c++)

代码：

//回调函数
LRESULT CALLBACK WinProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  switch (uMsg)
  {
  case WM_CREATE:
  break;
  case WM_DESTROY:
  {
    PostQuitMessage(0);
  }
  break;
  }
  return DefWindowProc(hWnd, uMsg, wParam, lParam);
}


// 全局变量:
HINSTANCE hInst;                                // 当前实例
WCHAR szTitle[MAX_LOADSTRING];                  // 标题栏文本
WCHAR szWindowClass[MAX_LOADSTRING];            // 主窗口类名

// 此代码模块中包含的函数的前向声明:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
  HWND hWnd = 0;
  MSG nMsg = {0};
  //创建窗口类
  WNDCLASS cs = { 0 };//窗口类
  cs.cbClsExtra = 0;
  cs.cbWndExtra = 0;
  cs.hbrBackground = (HBRUSH)(COLOR_WINDOW + 2);
  cs.hCursor = NULL;
  cs.hIcon = NULL;
  cs.hInstance = hInstance;
  cs.lpfnWndProc = (WNDPROC)WinProc; //回调函数，相当于自定义窗体事件
  cs.lpszClassName = L"Main";
  cs.lpszMenuName = NULL;
  cs.style = CS_VREDRAW | CS_HREDRAW;
  //注册窗口类
  RegisterClass(&cs);//实现注册类
  //创建窗口
  hWnd = CreateWindow(L"Main", L"Windows", WS_OVERLAPPEDWINDOW, 200, 200, 500, 500, NULL, NULL, hInstance, NULL);
  //显示窗口（在界面上显示）
  ShowWindow(hWnd, SW_SHOW);
  //更新窗口
  UpdateWindow(hWnd);
  //消息循环
  MSG msg;
  while (GetMessage(&msg, NULL, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }

  //销毁窗体、注销类
  DestroyWindow(hWnd);
  hWnd = NULL;
  //UnregisterClass();
  return 0;
}

运行效果如下：

创建流程：

1.创建窗口类

2.设置回调函数（用于监听事件或者相应对应事件）

3.注册窗口类

4.创建窗口

5.显示窗口

6.更新窗口

7.消息循环

8.销毁窗口，注销类