创建窗口

首先得确认Vs的项目属性-链接器-系统-子系统参数是窗口

窗口的创建非常容易，只需要调用CreateWindow函数即可。

• 要创建一个窗口，首先要注册一个窗口类。

  static TCHAR* szAppName = TEXT("HelloWin");
  HWND hWnd;
  MSG msg;
  WNDCLASS wndclass;
  
  //创建窗口类
  wndclass.style = CS_HREDRAW | CS_VREDRAW;
  wndclass.lpfnWndProc = WndProc;
  wndclass.cbClsExtra = 0;
  wndclass.cbWndExtra = 0;
  wndclass.hInstance = hInstance;
  wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
  wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
  wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
  wndclass.lpszMenuName = NULL;
  wndclass.lpszClassName = szAppName;
  
  //注册窗口类
  if (!RegisterClass(&wndclass))
  {
  	MessageBox(NULL, TEXT("窗口类注册失败"), szAppName, MB_ICONERROR);
  	return 0;
  }
  

• 然后调用CreateWindow函数创建窗口

  hWnd = CreateWindow(szAppName,//窗口类名
  	TEXT("The Hello Program"),//窗口标题
  	WS_OVERLAPPEDWINDOW, //窗口样式
  	CW_USEDEFAULT,//窗口x位置
  	CW_USEDEFAULT,//窗口y位置
  	CW_USEDEFAULT,//窗口宽度
  	CW_USEDEFAULT,//窗口高度
  	NULL,//父窗口的句柄
  	NULL,//窗口菜单句柄
  	hInstance,
  	NULL);
  

• 然后使用ShowWindow和UpdateWindow函数显示和更新窗口

  ShowWindow(hWnd, SW_SHOW);
  UpdateWindow(hWnd);
  

• 然后就是消息循环

  while (GetMessage(&msg,NULL,0,0))
  {
  	TranslateMessage(&msg);
  	DispatchMessage(&msg);
  }
  return msg.wParam;
  

• 消息处理的回调函数如下

  LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM  lParam)
  {
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
    switch (message)
    {
    case WM_PAINT:
        //在窗口中心显示文字
        hdc = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rect);
        DrawText(hdc, TEXT("Hello,Windows 10"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
        EndPaint(hwnd, &ps);
        return 0;
    case WM_DESTROY:
        //处理窗口退出消息
        PostQuitMessage(0);
        return 0;
    default:
        //其他情况调用默认函数处理
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
  
  }
  
  

• 程序完整代码如下

  #include <Windows.h>
  LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
  int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPreInstance, PSTR szCmdLine, int iCmdShow)
  {
    static TCHAR* szAppName = TEXT("HelloWin");
    HWND hWnd;
    MSG msg;
    WNDCLASS wndclass;
  
    //创建窗口类
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;
  
    //注册窗口类
    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, TEXT("窗口类注册失败"), szAppName, MB_ICONERROR);
        return 0;
    }
    hWnd = CreateWindow(szAppName,//窗口类名
        TEXT("The Hello Program"),//窗口标题
        WS_OVERLAPPEDWINDOW, //窗口样式
        CW_USEDEFAULT,//窗口x位置
        CW_USEDEFAULT,//窗口y位置
        CW_USEDEFAULT,//窗口宽度
        CW_USEDEFAULT,//窗口高度
        NULL,//父窗口的句柄
        NULL,//窗口菜单句柄
        hInstance,
        NULL);
    ShowWindow(hWnd, SW_SHOW);
    UpdateWindow(hWnd);
    while (GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
  }
  
  LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM  lParam)
  {
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
    switch (message)
    {
    case WM_PAINT:
        //在窗口中心显示文字
        hdc = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rect);
        DrawText(hdc, TEXT("Hello,Windows 10"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
        EndPaint(hwnd, &ps);
        return 0;
    case WM_DESTROY:
        //处理窗口退出消息
        PostQuitMessage(0);
        return 0;
    default:
        //其他情况调用默认函数处理
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
  
  }
  
  

  程序运行成功后如图所示：