关于标准输出重定向到 管道的使用

void Call(){SECURITY_ATTRIBUTES sa;//创建一个安全属性的变量HANDLE hRead,hWrite; //管道的读写句柄声明sa.nLength = sizeof(SECURITY_ATTRIBUTES); //获取安全属性的长度sa.lpSecurityDescriptor = NULL;  //使用系统默认的安全描述符 sa.bInheritHandle = TRUE;  //创建的进程允许继承句柄if (!CreatePipe(&hRead,&hWrite,&sa,0))  //创建匿名管道{  MessageBox("CreatePipe Failed!","提示",MB_OK | MB_ICONWARNING);  return;}STARTUPINFO si; //启动信息结构体变量PROCESS_INFORMATION pi;//需要传入的进程信息的变量ZeroMemory(&si,sizeof(STARTUPINFO)); //因为要传入参数，所以先清空该变量si.cb = sizeof(STARTUPINFO); //结构体的长度GetStartupInfo(&si); si.hStdError = hWrite; si.hStdOutput = hWrite;  //新创建进程的标准输出连在写管道一端si.wShowWindow = SW_HIDE;  //隐藏窗口 si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;char cmdline[200];CString tmp,stredit2;GetDlgItemText(IDC_EDIT2,stredit2);  //获取编辑框中输入的命令行tmp.Format("cmd /C %s",stredit2);sprintf(cmdline,"%s",tmp);if (!CreateProcess(NULL,cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))  //创建子进程{MessageBox("CreateProcess Failed!","提示",MB_OK | MB_ICONWARNING);  return;}CloseHandle(hWrite);  //关闭管道句柄char buffer[4096] = {0};CString strOutput;DWORD bytesRead;while (true){if (ReadFile(hRead,buffer,4095,&bytesRead,NULL) == NULL)  //读取管道内容到buffer中  break;strOutput += buffer;SetDlgItemText(IDC_EDIT2,strOutput);  //显示输出信息到编辑框,并刷新窗口UpdateWindow();Sleep(100);}CloseHandle(hRead); //关闭读取句柄}