通过匿名管道获取CMD运行结果

 #include <iostream>
 #include <string>
 #include <Windows.h>

 using namespace std;

 /*
 获取CMD执行结果
 cmdLine:要执行的命令
 */
 char *GetCmdRet(char *cmdLine);

 int main(void)
 {
     char *ret = GetCmdRet("ipconfig");
     cout << ret << endl;
     free(ret);
     cout << "\n====================换个命令玩玩====================\n" << endl;
     ret = GetCmdRet("dir");
     cout << ret << endl;
     free(ret);
     system("pause");
     return ;
 }

 char *GetCmdRet(char *cmdLine)
 {
     HANDLE hRead = NULL, hWrite = NULL;
     PROCESS_INFORMATION pInfo = {  };
     SECURITY_ATTRIBUTES se = {  };
     STARTUPINFO sInfo = {  };
     char tmpCmd[] = {  }, *retStr = NULL;
     DWORD dwLen = ;
     string ret;

     se.nLength = sizeof(se);
     se.lpSecurityDescriptor = NULL;
     se.bInheritHandle = TRUE;

     // 创建一个匿名管道
     CreatePipe(&hRead, &hWrite, &se, );

     sInfo.cb = sizeof(sInfo);
     sInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES; // 这两个常量分别用于设置隐藏窗口+输出目标
     sInfo.wShowWindow = SW_HIDE; // 隐藏窗口运行
     sInfo.hStdOutput = hWrite;    // 让其输出到这个管道去而不是输出到控制台
     sInfo.hStdError = hWrite;    // 错误信息也是输出到该管道
     sprintf_s(tmpCmd, MAX_PATH, "cmd.exe /c %s", cmdLine);
     CreateProcess(NULL, tmpCmd, NULL, NULL, TRUE, NULL, NULL, NULL, &sInfo, &pInfo);
     CloseHandle(hWrite);

     while (dwLen != -)
     {
         // 查看管道中是否有数据
         PeekNamedPipe(hRead, NULL, NULL, NULL, &dwLen, NULL);
         if (dwLen)
         {
             memset(tmpCmd, , MAX_PATH);
             // 读取管道数据
             ReadFile(hRead, tmpCmd, dwLen, &dwLen, NULL);
             ret += tmpCmd;
         }
         else
         {
             DWORD dwExit = ;
             GetExitCodeProcess(pInfo.hProcess, &dwExit);
             // 避免程序已经退出,但管道仍有数据的情况
             if (dwExit != STILL_ACTIVE)
             {
                 CloseHandle(hRead);
                 break;
             }
         }
         // 一定要加个延时,否则可能有重复数据
         Sleep();
     }
     retStr = (char *)malloc(sizeof(char)*ret.length() + );
     memset(retStr, , ret.length() + );
     lstrcpyn(retStr, ret.c_str(), ret.length() + );
     return retStr;
 }