win32手动创建windows窗口的，小记

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win32手动创建windows窗口的，小记

2024-08-02 01:57:25 218人阅读

摘抄自文档，其中的函数需要以后花时间看

向 WinMain 添加功能

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。

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;    }

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 applicationHWND 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 applicationHWND 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。

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 WinMainShowWindow(hWnd,    nCmdShow);UpdateWindow(hWnd);

// The parameters to ShowWindow explained:// hWnd: the value returned from CreateWindow// nCmdShow: the fourth parameter from WinMainShowWindow(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。

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

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;}

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;
}

win32手动创建windows窗口的，小记

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