• win32手动创建windows窗口的，小记

    摘抄自文档，其中的函数需要以后花时间看

     

    向 WinMain 添加功能

    1. 首先，在 WinMain 函数内部创建 WNDCLASSEX 类型的窗口类结构。 此结构包含有关窗口的信息，如应用程序图标、窗口的背景色、在标题栏中显示的名称、窗口过程函数的名称等等。典型的 WNDCLASSEX 结构如下：

          WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

          WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

      有关此结构的字段解释，请参见 WNDCLASSEX。

    2. 现在已经创建了窗口类，接下来您必须注册它。使用 RegisterClassEx 函数，并将窗口类结构作为参数传递：

          if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

          if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    3. 现在已经注册了您自己的类，接下来创建窗口。使用 CreateWindow 函数，如下所示：

      static TCHAR szWindowClass[] = _T("win32app");
static TCHAR szTitle[] = _T("Win32 Guided Tour Application");
// The parameters to CreateWindow explained:
// szWindowClass: the name of the application
// szTitle: the text that appears in the title bar
// WS_OVERLAPPEDWINDOW: the type of window to create
// CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
// 500, 100: initial size (width, length)
// NULL: the parent of this window
// NULL: this application dows not have a menu bar
// hInstance: the first parameter from WinMain
// NULL: not used in this application
HWND hWnd = CreateWindow(
    szWindowClass,
    szTitle,
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT, CW_USEDEFAULT,
    500, 100,
    NULL,
    NULL,
    hInstance,
    NULL
);
if (!hWnd)
{
    MessageBox(NULL,
        _T("Call to CreateWindow failed!"),
        _T("Win32 Guided Tour"),
        NULL);

    return 1;
}

      static TCHAR szWindowClass[] = _T("win32app");
static TCHAR szTitle[] = _T("Win32 Guided Tour Application");
// The parameters to CreateWindow explained:
// szWindowClass: the name of the application
// szTitle: the text that appears in the title bar
// WS_OVERLAPPEDWINDOW: the type of window to create
// CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
// 500, 100: initial size (width, length)
// NULL: the parent of this window
// NULL: this application dows not have a menu bar
// hInstance: the first parameter from WinMain
// NULL: not used in this application
HWND hWnd = CreateWindow(
    szWindowClass,
    szTitle,
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT, CW_USEDEFAULT,
    500, 100,
    NULL,
    NULL,
    hInstance,
    NULL
);
if (!hWnd)
{
    MessageBox(NULL,
        _T("Call to CreateWindow failed!"),
        _T("Win32 Guided Tour"),
        NULL);

    return 1;
}

      此函数返回 HWND，它是某个窗口的句柄。有关更多信息，请参见 Windows 数据类型。

    4. 创建了窗口后，我们可以使用以下代码将其显示在屏幕上：

      // The parameters to ShowWindow explained:
// hWnd: the value returned from CreateWindow
// nCmdShow: the fourth parameter from WinMain
ShowWindow(hWnd,
    nCmdShow);
UpdateWindow(hWnd);

      // The parameters to ShowWindow explained:
// hWnd: the value returned from CreateWindow
// nCmdShow: the fourth parameter from WinMain
ShowWindow(hWnd,
    nCmdShow);
UpdateWindow(hWnd);

      到目前为止，此窗口还不会显示，因为我们尚未实现 WndProc 函数。

    5. WinMain 的最后一步是消息循环。 此循环的用途是侦听操作系统发送的消息。应用程序收到消息后，将该消息调度到 WndProc 函数，以便进行处理。 消息循环类似于：

       
      以带有颜色区分的格式查看复制到剪贴板打印
          MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;

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

    return (int) msg.wParam;

      有关消息循环中使用的结构和函数的更多信息，请参见 MSG、 GetMessage、 TranslateMessage 和 DispatchMessage。

      您刚才完成的步骤为大多数 Win32 应用程序所共用。有关此应用程序所需要的 include 指令和全局变量声明，请参见本主题末尾的完整代码 示例。

      此时， WinMain 函数应该与下面的内容类似：

      int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    hInst = hInstance; // Store instance handle in our global variable

    // The parameters to CreateWindow explained:
    // szWindowClass: the name of the application
    // szTitle: the text that appears in the title bar
    // WS_OVERLAPPEDWINDOW: the type of window to create
    // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
    // 500, 100: initial size (width, length)
    // NULL: the parent of this window
    // NULL: this application dows not have a menu bar
    // hInstance: the first parameter from WinMain
    // NULL: not used in this application
    HWND hWnd = CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        500, 100,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hWnd)
    {
        MessageBox(NULL,
            _T("Call to CreateWindow failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    // The parameters to ShowWindow explained:
    // hWnd: the value returned from CreateWindow
    // nCmdShow: the fourth parameter from WinMain
    ShowWindow(hWnd,
        nCmdShow);
    UpdateWindow(hWnd);

    // Main message loop:
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

      int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    hInst = hInstance; // Store instance handle in our global variable

    // The parameters to CreateWindow explained:
    // szWindowClass: the name of the application
    // szTitle: the text that appears in the title bar
    // WS_OVERLAPPEDWINDOW: the type of window to create
    // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
    // 500, 100: initial size (width, length)
    // NULL: the parent of this window
    // NULL: this application dows not have a menu bar
    // hInstance: the first parameter from WinMain
    // NULL: not used in this application
    HWND hWnd = CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        500, 100,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hWnd)
    {
        MessageBox(NULL,
            _T("Call to CreateWindow failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    // The parameters to ShowWindow explained:
    // hWnd: the value returned from CreateWindow
    // nCmdShow: the fourth parameter from WinMain
    ShowWindow(hWnd,
        nCmdShow);
    UpdateWindow(hWnd);

    // Main message loop:
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

    向 WndProc 添加功能

    1. WndProc 函数的用途是处理应用程序接收的消息。 通常使用 Switch 函数实现此操作。

      我们将处理的第一个消息是 WM_PAINT 消息。 当必须更新应用程序窗口的一部分时，应用程序会收到此消息。首次创建窗口时，必须更新整个窗口，并传递此消息以指示此操作。

      当处理 WM_PAINT 消息时，首先应做的是调用 BeginPaint，最后应做的是调用 EndPaint。 在这两个函数调用之间，您可以处理所有的逻辑，以在窗口中排列文本、按钮和其他控件。对于此应用程序，我们在窗口中显示字符串“Hello, World!”。若要显示文本，请使用 TextOut 函数，也可以使用drawtext函数如下所示：

      PAINTSTRUCT ps;
HDC hdc;
TCHAR greeting[] = _T("Hello, World!");

switch (message)
{
case WM_PAINT:
    hdc = BeginPaint(hWnd, &ps);

    // Here your application is laid out.// For this introduction, we just print out "Hello, World!"
    // in the top left corner.TextOut(hdc,
        5, 5,
        greeting, _tcslen(greeting));
    // End application-specific layout section.EndPaint(hWnd, &ps);
    break;
}

      PAINTSTRUCT ps;
HDC hdc;
TCHAR greeting[] = _T("Hello, World!");

switch (message)
{
case WM_PAINT:
    hdc = BeginPaint(hWnd, &ps);

    // Here your application is laid out.// For this introduction, we just print out "Hello, World!"
    // in the top left corner.TextOut(hdc,
        5, 5,
        greeting, _tcslen(greeting));
    // End application-specific layout section.EndPaint(hWnd, &ps);
    break;
}

    2. 应用程序通常会处理许多其他消息，如 WM_CREATE 和 WM_DESTROY。 一个简单而完整的 WndProc 函数如下：

      LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    TCHAR greeting[] = _T("Hello, World!");

    switch (message)
    {
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);

        // Here your application is laid out.// For this introduction, we just print out "Hello, World!"
        // in the top left corner.TextOut(hdc,
            5, 5,
            greeting, _tcslen(greeting));
        // End application specific layout section.EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }

    return 0;
}


      完整代码：

      #include <windows.h>
      #include <stdlib.h>
      #include <string.h>
      #include <tchar.h>

      // Global variables

      // The main window class name.static TCHAR szWindowClass[] = _T("win32app");

      // The string that appears in the application's title bar.static TCHAR szTitle[] = _T("Win32 Guided Tour Application");

      HINSTANCE hInst;

      // Forward declarations of functions included in this code module:
      LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

      int WINAPI WinMain(HINSTANCE hInstance,
      HINSTANCE hPrevInstance,
      LPSTR lpCmdLine,
      int nCmdShow)
      {
      WNDCLASSEX wcex;

      wcex.cbSize = sizeof(WNDCLASSEX);
      wcex.style = CS_HREDRAW | CS_VREDRAW;
      wcex.lpfnWndProc = WndProc;
      wcex.cbClsExtra = 0;
      wcex.cbWndExtra = 0;
      wcex.hInstance = hInstance;
      wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
      wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
      wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
      wcex.lpszMenuName = NULL;
      wcex.lpszClassName = szWindowClass;
      wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

      if (!RegisterClassEx(&wcex))
      {
      MessageBox(NULL,
      _T("Call to RegisterClassEx failed!"),
      _T("Win32 Guided Tour"),
      NULL);

      return 1;
      }

      hInst = hInstance; // Store instance handle in our global variable

      // The parameters to CreateWindow explained:
      // szWindowClass: the name of the application
      // szTitle: the text that appears in the title bar
      // WS_OVERLAPPEDWINDOW: the type of window to create
      // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
      // 500, 100: initial size (width, length)
      // NULL: the parent of this window
      // NULL: this application does not have a menu bar
      // hInstance: the first parameter from WinMain
      // NULL: not used in this application
      HWND hWnd = CreateWindow(
      szWindowClass,
      szTitle,
      WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, CW_USEDEFAULT,
      500, 100,
      NULL,
      NULL,
      hInstance,
      NULL
      );

      if (!hWnd)
      {
      MessageBox(NULL,
      _T("Call to CreateWindow failed!"),
      _T("Win32 Guided Tour"),
      NULL);

      return 1;
      }

      // The parameters to ShowWindow explained:
      // hWnd: the value returned from CreateWindow
      // nCmdShow: the fourth parameter from WinMain
      ShowWindow(hWnd,
      nCmdShow);
      UpdateWindow(hWnd);

      // Main message loop:
      MSG msg;
      while (GetMessage(&msg, NULL, 0, 0))
      {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
      }

      return (int) msg.wParam;
      }

      //
      // FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
      //
      // PURPOSE: Processes messages for the main window.//
      // WM_PAINT - Paint the main window
      // WM_DESTROY - post a quit message and return
      //
      //
      LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
      {
      PAINTSTRUCT ps;
      HDC hdc;
      TCHAR greeting[] = _T("Hello, World!");

      switch (message)
      {
      case WM_PAINT:
      hdc = BeginPaint(hWnd, &ps);

      // Here your application is laid out.// For this introduction, we just print out "Hello, World!"
      // in the top left corner.TextOut(hdc,
      5, 5,
      greeting, _tcslen(greeting));
      // End application-specific layout section.EndPaint(hWnd, &ps);
      break;
      case WM_DESTROY:
      PostQuitMessage(0);
      break;
      default:
      return DefWindowProc(hWnd, message, wParam, lParam);
      break;
      }

      return 0;
      }
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  • 原文地址：https://www.cnblogs.com/HIT-LYT/p/4096704.html
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