VC实现CMD回显

string runCmd(string strCommend)
{
	//
	//通过管道技术回显cmd输出信息
	// 

	SECURITY_ATTRIBUTES sa;
	HANDLE hRead,hWrite;
	string strOutput;

	sa.nLength = sizeof(SECURITY_ATTRIBUTES); 
	sa.lpSecurityDescriptor = NULL;  //使用系统默认的安全描述符 
	sa.bInheritHandle = TRUE;  //创建的进程继承句柄

	if (!CreatePipe(&hRead,&hWrite,&sa,0))  //创建匿名管道
	{  
		MessageBox(NULL,"CreatePipe Failed!","提示",MB_OK | MB_ICONWARNING);  
		return strOutput;
	}

	STARTUPINFO si; 
	PROCESS_INFORMATION pi;

	ZeroMemory(&si,sizeof(STARTUPINFO));
	si.cb = sizeof(STARTUPINFO); 
	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[500]; 
	sprintf_s(cmdline,"cmd /C %s",strCommend.c_str());

	if (!CreateProcess(NULL,cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))  //创建子进程
	{
		MessageBox(NULL,"CreateProcess Failed!","提示",MB_OK | MB_ICONWARNING);  
		return strOutput;
	}
	CloseHandle(hWrite);  //关闭管道句柄

	char buffer[4096] = {0};
	
	DWORD bytesRead;

	while (true) 
	{
		if (ReadFile(hRead,buffer,4095,&bytesRead,NULL) == NULL)  //读取管道
			break;

		strOutput.append(buffer);
		Sleep(100);
	}
	CloseHandle(hRead);

	return strOutput;
}