Question

我是Win32 API的初学者，但我对C ++有中等经验。出于学习目的，我根据参考资料，教程和示例创建了一个非常简单的Win32应用程序。

问题是，在主窗口关闭后，其进程仍然在后台运行。我怎么能阻止这个？在我的WndProc函数中，我确实有一个带有DestroyWindow的WM_DESTROY案例，但它似乎没有做到这一点。代码如下：

#include <cstdio>
#include <cstdlib>

#ifdef UNICODE
#include <tchar.h>
#endif

#include <Windows.h>

HINSTANCE hinst;
HWND hwnd;

LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

#ifdef UNICODE
int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
#else
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
#endif
{
    MSG msg;
    WNDCLASSEX mainclass;
    BOOL bRet;
    UNREFERENCED_PARAMETER(lpCmdLine);

    mainclass.cbSize =          sizeof(WNDCLASSEX);
    mainclass.style =           CS_VREDRAW | CS_HREDRAW;
    mainclass.lpfnWndProc =     (WNDPROC) WndProc;
    mainclass.cbClsExtra =      NULL;
    mainclass.cbWndExtra =      NULL;
    mainclass.hInstance =       hInstance;
    mainclass.hIcon =           NULL;
    mainclass.hCursor =         LoadCursor(NULL, IDC_ARROW);
    mainclass.hbrBackground =   (HBRUSH) COLOR_WINDOW;
    mainclass.lpszMenuName =    NULL;
    mainclass.lpszClassName =   TEXT("MainWindowClass");
    mainclass.hIconSm =         NULL;

    if (!RegisterClassEx(&mainclass))
        return FALSE;

    hinst = hInstance;

    hwnd = CreateWindowEx(
        WS_EX_WINDOWEDGE,
        TEXT("MainWindowClass"),
        TEXT("Test Window"),
        WS_CAPTION | WS_VISIBLE | WS_SIZEBOX | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hinst,
        NULL);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    while ((bRet = GetMessage(&msg, NULL, 0, 0)) != 0)
    {
        if (bRet != -1)
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
    return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    switch(uMsg)
    {
    case WM_DESTROY:
        DestroyWindow(hwnd);
        break;
    case WM_PAINT:
        BeginPaint(hwnd, &ps);
        EndPaint(hwnd, &ps);
        break;
    default:
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
    return 0;
}

Answer 1

请勿致电DestroyWindow()。该消息告诉您窗口已被销毁。致电PostQuitMessage(0)退出申请。

Answer 2

在你的WndProc中为WM_CLOSE添加一个案例并调用PostQuitMessage。

LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  case WM_CLOSE:
  PostQuitMessage(0);
  break;
  // other cases
}

当用户单击关闭按钮（或从sys菜单）时，Windows将发布WM_CLOSE消息。这将导致您的主Windows消息处理程序退出。这反过来将确保您的应用程序正常退出。

主窗口关闭后，如何防止Win32应用程序在后台运行？

2 个答案: