转载：
https://blog.csdn.net/kikaylee/article/details/51395360

/*
@描述：一个简单的Windows守护进程的例子（C++版本）
@作者：kikaylee
@日期：2016-05-13 10:30
*/#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
#include <io.h>
#include <iostream>using namespace std;//隐藏DOS黑窗口
#pragma comment(linker,"/subsystem:\"windows\"  /entry:\"mainCRTStartup\"" ) //定义路径最大程度
#define MAX_PATH 4096
//定义守护进程名称
#define PROCCESS_NAME "test.exe"
//定义写入的注册表路径
#define SELFSTART_REGEDIT_PATH "Software\\Microsoft\\Windows\\CurrentVersion\\Run\\"//设置本身开机自启动
BOOL SetSelfStart()
{//获取程序完整名称char pName[MAX_PATH]={0};GetModuleFileNameA(NULL,pName,MAX_PATH);//在注册表中写入启动信息HKEY hKey=NULL;LONG lRet=NULL;lRet=RegOpenKeyExA(HKEY_LOCAL_MACHINE,SELFSTART_REGEDIT_PATH,0,KEY_ALL_ACCESS,&hKey);//判断是否成功if(lRet!=ERROR_SUCCESS){return FALSE;}lRet=RegSetValueExA(hKey,"testProtect",0,REG_SZ,(const unsigned char*)pName,strlen(pName)+sizeof(char));//判断是否成功if(lRet!=ERROR_SUCCESS){return FALSE;}//关闭注册表RegCloseKey(hKey);return TRUE;
}int main()
{//设置程序开机自启动if(!SetSelfStart()){cout<<"守护进程开机自启动失败"<<endl;return -1;}STARTUPINFOA si;//进程对象PROCESS_INFORMATION pi;//初始化ZeroMemory(&si,sizeof(si));si.cb=sizeof(si);ZeroMemory(&pi,sizeof(pi));//获取当前程序的路径char pPath[MAX_PATH]={0};GetCurrentDirectoryA(MAX_PATH,pPath);//拼接需要守护的程序strcat(pPath,"\\");strcat(pPath,PROCCESS_NAME);//构造cmd执行守护进程的字符串char pCmd[MAX_PATH]={0};strcat(pCmd,"cmd /c ");strcat(pCmd,pPath);//无限循环，监视守护进程do{//检查守护程序是否存在if(_access(pPath,0)!=-1){//创建子进程，判断是否执行成功if(!CreateProcessA(NULL,pCmd,NULL,NULL,FALSE,0,NULL,NULL,&si,&pi)){cout<<"守护进程启动失败，程序即将退出"<<endl;return -1;}//启动成功，获取进程的IDcout<<"守护进程成功，ID:"<<pi.dwProcessId<<endl;//无限等待子进程退出WaitForSingleObject(pi.hProcess,INFINITE);//如果退出了cout<<"守护进程退出了。。。"<<endl;//关闭进程和句柄CloseHandle(pi.hProcess);CloseHandle(pi.hThread);}else{cout<<"守护程序不存在"<<endl;}//睡一下，重启Sleep(2000);}while(true);return 0;
}