c++ - WinApi任务查杀

我有超级简单的WinApi程序。关闭按钮不会破坏程序的进程。应该添加什么？

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


LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

HINSTANCE hINSTANCE;

int WINAPI WinMain(HINSTANCE hInstance,
               HINSTANCE hPrevInstance,
               LPSTR lpstr,
               int nCmdShow) {

// VARIABLES
    TCHAR className[] = _T("win32api");
    TCHAR windowName[] = _T("Protected Window");

    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(NULL, IDI_INFORMATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)COLOR_BACKGROUND;
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = className;
    wcex.hIconSm = LoadIcon(NULL, IDI_SHIELD);

    if (!RegisterClassEx(&wcex)) {
        MessageBox(NULL, _T("Cannot register window"), _T("Error"), MB_OK | MB_ICONERROR);
        return 0;
    }

     HWND hWnd = CreateWindow(className,
                              windowName,
                              WS_OVERLAPPEDWINDOW,
                              CW_USEDEFAULT,
                              CW_USEDEFAULT,
                              300,
                              300,
                              NULL,
                              NULL,
                              hInstance,
                              NULL);

    if (!hWnd) {
        MessageBox(hWnd, _T("Call to register windows isn't working"), _T("Error"), NULL);
        return 1;
    }

    hINSTANCE = hInstance;
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    MSG msg;

    while (GetMessage(&msg, hWnd, 0, 0) != 0 || GetMessage(&msg, hWnd, 0, 0) != -1) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.lParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uInt, WPARAM wParam, LPARAM lParam) {
    PAINTSTRUCT ps;
    HDC hdc;
    switch (uInt) {
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        TextOut(hdc, 10, 20, _T("Text sample right here boyz."), _tcsclen(_T("Text sample right here boyz.")));
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, uInt, wParam, lParam);
        break;
    }

    return 0;
}

如果再加上一种情况

case WM_CLOSE:
    PostQuitMessage(0);
    break;

它根本不会关闭（按关闭按钮没有做任何事情）。任何其他提示都非常感谢。

最佳答案

您的消息循环是错误的，原因有两个：

您两次拨打GetMessage()。不要那样做！想想如果发生的话会发生什么。如果GetMessage()左侧的||调用检测到WM_QUIT（它不能，请参见下文），它将返回0。这将导致||调用右侧，忽略上一个调用中的GetMessage()并阻塞循环，直到稍后收到新消息。您应该在每个循环迭代中仅调用一次WM_QUIT，然后根据需要对返回值进行操作：

BOOL bRet;

do
{
    bRet = GetMessage(&msg, hWnd, 0, 0);
    if (bRet == 0) break;
    if (bRet == -1)
    {
        // handle the error and possibly exit
    }
    else
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}
while (1);

但是，您还按GetMessage()（don't do that!）筛选邮件，因此它将仅返回通过HWND发布到指定HWND的邮件。 PostMessage()将其PostQuitMessage()消息发布到调用线程本身的输入队列，而不发布到WM_QUIT。因此，筛选将永远不会看到HWND消息。为了使WM_QUIT中断循环，您需要完全停止通过WM_QUIT进行过滤，或者至少定期进行未过滤的调用。

您的消息循环应该看起来像这样。这是标准的消息循环：

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

在这种情况下，请注意there is no need to handle -1 from HWND!。

关于c++ - WinApi任务查杀，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36871265/

getMessage

c++ - WinApi任务查杀