c++ - 向其他进程发送消息

Question

for (int i = 0; i < n; i++)
{
    const char* cstr = strings[i].c_str();
    swprintf_s(fullCommandLine, L"\"%s\" \"%s\" %S", pathToModule, pathToFile, cstr);
    if(CreateProcess(NULL,
        (LPWSTR)fullCommandLine,
        NULL,
        NULL,
        FALSE,
        0,
        NULL,
        NULL,
        &si,
        &pi))
    {
        cout << "succes";
    }
    else cout << "fail";
}

我正在创建 n 个进程来像这样在给定的文件中查找字符串，并且在我的模块中(wchich 在文件中查找给定的字符串)我想向其他 n-1 个进程发送消息以退出

while (file >> readout)
{
    if (readout == search)
    {
        cout << "I found string";
        SendMessage(/*what should be here*/);
    }
}

我从哪里可以获得那些其他进程的句柄？

Answer 1

请看我的PostThreadMessage to Console Application .

我创建它是因为肯定可以向控制台程序发送消息，我们只需要创建一个消息循环，就像可以从控制台程序显示一个窗口一样。

注意 PostThreadMessage 需要一个线程 id，而不是进程 id。每个进程也有一个线程 ID，进程的线程 ID 在 CreateProcess 的 PROCESS_INFORMATION 中。

以下是一个更大但更易于使用的示例，用于演示 PostThreadMessage 在控制台程序中的工作。如果没有参数，该程序将调用自身(传递其线程 ID)，然后它将等待新进程发送消息。如果有一个参数，那么它将假定该参数是一个线程 ID，并向该线程发送一条消息，然后是一个 WM_QUIT。

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
    TCHAR szCmdline[300];
    PROCESS_INFORMATION piProcInfo;
    STARTUPINFO siStartInfo;
    BOOL bSuccess = FALSE;

    ZeroMemory(&piProcInfo, sizeof(PROCESS_INFORMATION));
    ZeroMemory(&siStartInfo, sizeof(STARTUPINFO));
    siStartInfo.cb = sizeof(STARTUPINFO);
    siStartInfo.hStdError = NULL;
    siStartInfo.hStdOutput = NULL;
    siStartInfo.hStdInput = NULL;

    DWORD dwThread;
    MSG Msg;
    TCHAR ThreadIdBuffer[40];

    // if no argument then execute ourself then wait for a message from that thread
    if (argc == 1) {
        _itot_s(GetCurrentThreadId(), ThreadIdBuffer, 40, 10);
        szCmdline[0] = '"';
        szCmdline[1] = 0;
        _tcscat_s(szCmdline, 300, argv[0]); // ourself
        int n = _tcslen(szCmdline);
        szCmdline[n++] = '"';
        szCmdline[n++] = ' ';
        szCmdline[n++] = 0;
        _tcscat_s(szCmdline, 300, ThreadIdBuffer);  // our thread id
        bSuccess = CreateProcess(argv[0], // execute ourself
            szCmdline,     // command line
            NULL,          // process security attributes 
            NULL,          // primary thread security attributes 
            TRUE,          // handles are inherited 
            0,             // creation flags 
            NULL,          // use parent's environment 
            NULL,          // use parent's current directory 
            &siStartInfo,  // STARTUPINFO pointer 
            &piProcInfo);  // receives PROCESS_INFORMATION 
        if (!bSuccess) {
            std::cout << "Process not started\n";
            return 0;
            }
        std::cout << "Waiting\n";
        // Now wait for the other process to send us a message
        while (GetMessage(&Msg, NULL, 0, WM_USER)) {
            if (Msg.message == WM_COMMAND)
                std::cout << "WM_COMMAND\n";
            else
                std::cout << "Message: " << Msg.message << '\n';
        }
        std::cout << "End of message loop\n";
        return 0;
    }

    // if there is an argument then assume it is a threadid of another one of us
    std::cout << "Press Enter to send the message\n";
    if (std::wcin.get() != '\n')
        return 0;
    dwThread = _wtoi(argv[1]);
    if (!PostThreadMessage(dwThread, WM_COMMAND, (WPARAM)0, (LPARAM)0))
        std::cout << GetLastError() << " PostThreadMessage error\n";
    if (!PostThreadMessage(dwThread, WM_QUIT, (WPARAM)0, (LPARAM)0))
        std::cout << GetLastError() << " PostThreadMessage error\n";
    return 0;
}