Window提高_3.1练习_双进程守护

双进程守护

当打开一个进程A的时候，此进程检测是否存在进程B，如果不存在就创建进程B。

进程B的作用是检测进程A是否被关闭，如果被关闭了，就再创建一个进程A。

双进程守护A.exe代码如下：

#include "pch.h"
#include <iostream>
#include <windows.h>
int main()
{
    while (TRUE)
    {
        HWND hWnd = FindWindow(NULL, L"双进程守护B");
        if (hWnd==NULL)
        {
            
            STARTUPINFO StartupInfo = { sizeof(STARTUPINFO) };
            PROCESS_INFORMATION ProcessInformation = { 0 };
            CreateProcess(L"..\Debug\双进程守护B.exe", 
                NULL, NULL, NULL,
                NULL, NULL, NULL, NULL,
                &StartupInfo,
                &ProcessInformation);
            WaitForSingleObject(ProcessInformation.hProcess, -1);

        }
        else
        {
            DWORD dwPid = 0;
            GetWindowThreadProcessId(hWnd, &dwPid);
            HANDLE hProc = OpenProcess(
                SYNCHRONIZE, NULL, dwPid);
            WaitForSingleObject(hProc, -1);
        }
    }
}

双进程守护B.exe代码如下：

#include "pch.h"
#include <iostream>
#include <windows.h>
int main()
{
    while (TRUE)
    {
        HWND hWnd = FindWindow(NULL, L"双进程守护A");
        if (hWnd == NULL)
        {
            STARTUPINFO StartupInfo = { sizeof(STARTUPINFO) };
            PROCESS_INFORMATION ProcessInformation = { 0 };
            CreateProcess(L"..\Debug\双进程守护A.exe",
                NULL,NULL, NULL,
                NULL, NULL,NULL, NULL, 
                &StartupInfo, 
                &ProcessInformation);

            WaitForSingleObject(
                ProcessInformation.hProcess, -1);

        }
        else
        {
            DWORD dwPid = 0;
            GetWindowThreadProcessId(hWnd, &dwPid);
            HANDLE hProc = OpenProcess(SYNCHRONIZE, NULL, dwPid);
            WaitForSingleObject(hProc, -1);
        }
    }
}