匿名管道如何读取ncftpput.exe输出数据

[xxq123321]

ncftpput是一个ftp上传程序，上传文件时控制台不断向stderr打印文件上传字节数，剩余时间等信息，目前碰到的问题是
程序读取管道信息是移植阻塞在ReadFile那里，读取不到数据，用ping 127.0.0.1 -t测试正常

	SECURITY_ATTRIBUTES sa;
	HANDLE hRead,hWrite;
	sa.nLength = sizeof(SECURITY_ATTRIBUTES);
	sa.lpSecurityDescriptor = NULL;
	sa.bInheritHandle = TRUE;
	if (!CreatePipe(&hRead,&hWrite,&sa,0))
	{
		//ShowMessage("Error On CreatePipe()");
		return 0;
	}
	STARTUPINFO si;
	PROCESS_INFORMATION pi;
	si.cb = sizeof(STARTUPINFO);
	GetStartupInfo(&si);
	si.hStdError = hWrite;
	si.hStdOutput = hWrite;
	si.wShowWindow = SW_HIDE;
	si.hStdInput = hRead;
	si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
	TCHAR cmd[] = _T("ncftpput  -d d:\\dbug.log -e d:\\err.log -u skyftp -p dn2jv7s9 abc-cn.com \\ d:\\software\\X16-60997V.iso");

	if (!CreateProcess(NULL, cmd,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
	{
		//::ShowMess("Error on CreateProcess()");
		return 0;
	}
	CloseHandle(hWrite);
	char buffer[4096] = {0};
	DWORD bytesRead;
	while (true)
	{
		if (ReadFile(hRead,buffer,4096,&bytesRead,NULL) == NULL)  //程序移植阻塞在这里
			break;
		printf(buffer);
		//mmo1->Lines->Add(buffer);
		Sleep(200);
	}
	::CloseHandle(hRead);

[oyljerry]

ncftpput 是否有数据到管道.

[xxq123321]

这个是ncftpput打印上传信息的源码：

	(void) sprintf(line, "%-32s   ETA: %3d:%02d  %6.2f/%6.2f %-2.2s  %6.2f %.2s/s %.1s",
				localName,
				minLeft,
				secLeft,
				done,
				uTotal,
				uStr,
				rate,
				rStr,
				stall
			);

			/* Print the updated information. */
			(void) fprintf(stderr, "\r%s", line);

[hotpos]

试试 popen 呢

[xxq123321]

fopen是linux下的，我是windows

[xxq123321]

popen是linux下的，我是windows

[东莞某某某]

看起来管道代码没问题，单独运行子进程试试，还是以那些参数运行，看看输出，如果输出正常，就说明父进程代码问题了

[xxq123321]

找到原因了，原来是调用子进程的时候没有输出 fprintf(stderr, "\r%s", line);