httpsendrequest error 超时

[csh20140320]

一个通信软件，A方用internetopeninternet ...internetreadfile一次一连，B方用sock模拟http包连接通信。同时A用internetwritefile长连接向B方发送文件，当长连接发文件时间长一点了，一次一连的通信会返回httpsendrequest error 超时，就连不上了，只有重启才行，求助！！！
一次一连的A段代码：

int SendData( )
{	


	HINTERNET hHttpIe;
	HINTERNET hHttpHc;
	HINTERNET h_tempSend;
	DWORD cmdtype(0);
	hHttpIe = InternetOpenA("Mozilla/4.0 (compatible; MSIE 6.0; ""Windows NT 5.0; .NET CLR 1.1.4322",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
	if(!hHttpIe) 
	{	
		cout<<"InternetOpen error = "<<GetLastError()<<endl;
		return 0;
	}	
	//
	hHttpHc=InternetConnectA(hHttpIe,servname,m_uPort,NULL,NULL,INTERNET_SERVICE_HTTP,0,0);	
	if(!hHttpHc)
	{	
		cout<<"InternetConnect error = "<<GetLastError()<<endl;
		InternetCloseHandle(hHttpIe);
		return 0;
	}		
	h_tempSend = HttpOpenRequestA(hHttpHc,"POST",filename,NULL,NULL,NULL,INTERNET_FLAG_PRAGMA_NOCACHE|INTERNET_FLAG_NO_CACHE_WRITE| INTERNET_FLAG_KEEP_CONNECTION|INTERNET_FLAG_RELOAD,NULL);
	if(!h_tempSend)
	{	
		cout<<"HttpOpenRequest error = "<<GetLastError()<<endl;
		InternetCloseHandle(hHttpIe);
		InternetCloseHandle(hHttpHc);
	
		return -1;
	}
	//
	char chData[8]={0};
	int nLen(8);
	((DWORD*)chData)[0]=num0;
	((DWORD*)chData)[1]=EMPTY;
	//
	if(!HttpSendRequest(h_tempSend , NULL , 0 , (char *)chData, nLen ))
	{
		cout<<"HttpSendRequest error = "<<GetLastError()<<endl;
		InternetCloseHandle(h_tempSend);
		InternetCloseHandle(hHttpHc);
		InternetCloseHandle(hHttpIe);
  		return -1;
	}

	//internetreadfile
	int len=RecvFunc0(h_tempSend);

	if ( len <= 0 )
	{
		InternetCloseHandle(h_tempSend);
		InternetCloseHandle(hHttpHc);
		InternetCloseHandle(hHttpIe);
		return-1;
	}
	char *buf=new char[len];
	memset(buf,0,len);
	if ( RecvFunc1(h_tempSend,buf,len) <= 0 )
	{
		delete []buf;
		buf=0;
		InternetCloseHandle(h_tempSend);
		InternetCloseHandle(hHttpHc);
		InternetCloseHandle(hHttpIe);
		return -1;
	}
	//
	InternetCloseHandle(h_tempSend);
	InternetCloseHandle(hHttpHc);
	InternetCloseHandle(hHttpIe);

	int m=GetOEMCP();
	char cmidbuff[1000]={0};
	DWORD lBytesRead(0);
	//do
	num0=((DWORD*)buf)[0];
	cmdtype=((DWORD*)buf)[1];
	//
	switch (cmdtype)
	{

	case MMMM :
	do;
	break;
	..........

	default:
		break;
	}
	//
	delete []buf;
	buf=0;
    return 8;
}

长连接发文件的A段代码

DWORD WINAPI DownLoad(LPVOID lparameter)
{
	cout<<"start download"<<endl;
	DWORD dwRead(0);
	int filelen(0),datalen(0),readlen(0),allreadywritelen(0),readytowritelen(0);
	char sbuf[20]={0};
	char filenameflag[200]={0};
	
	//
	FILE*fp;
	if ( (fp=_wfopen(destpath,_T("rb")))==NULL )
	{
		return 1;
	}
	//
	fseek(fp,0,SEEK_END);
	filelen=ftell(fp);

	fseek(fp,offset,SEEK_SET);
	datalen=filelen-offset;
	//
	INTERNET_BUFFERS ib;
	HINTERNET hInternet(NULL),hConnection(NULL),hRequest(NULL);
	char * buf=new char[FILEMAXLEN];
	do 
	{
		CloseHandle(hRequest);
		CloseHandle(hConnection);
		CloseHandle(hInternet);

		memset(buf,0,FILEMAXLEN);
		readlen=fread(buf,1,FILEMAXLEN,fp);

		memset(&ib, 0, sizeof(INTERNET_BUFFERS));
		ib.dwStructSize = sizeof(INTERNET_BUFFERS);
		ib.dwBufferTotal = readlen;
		ib.dwBufferLength = 8192; 
		memset(filenameflag,0,200);
		if (feof(fp))//last connect
		{
			strcat(filenameflag,"downlast");
		}
		else
		{
			strcat(filenameflag,"down");
		}

		hInternet = InternetOpenA("Mozilla/4.0 (compatible; MSIE 6.0; ""Windows NT 5.0; .NET CLR 1.1.4322",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
		if (!hInternet)
		{
			goto isenda;
		}
		hConnection = InternetConnectA(hInternet, servname, m_uPort, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
		if (!hConnection)
		{
			goto isenda;
		}
		//1
		hRequest = HttpOpenRequestA(hConnection,"POST",filenameflag,NULL, NULL,NULL, 0, INTERNET_FLAG_EXISTING_CONNECT|INTERNET_FLAG_NO_AUTO_REDIRECT|INTERNET_FLAG_HYPERLINK);
		//2
// 		hRequest = HttpOpenRequestA(hConnection,"POST",filenameflag,NULL,NULL,NULL,INTERNET_FLAG_PRAGMA_NOCACHE|INTERNET_FLAG_KEEP_CONNECTION|
// 																				   INTERNET_FLAG_NO_CACHE_WRITE|INTERNET_FLAG_RELOAD,NULL);
		if (!hRequest)
		{
			goto isenda;
		}
		if (!HttpSendRequestEx(hRequest, &ib, 0, HSR_INITIATE, 0))
		{
			goto isenda;
		}
		//internetwritefile1
// 		if (InternetWriteFile(hRequest, buf, readlen, &dwRead)!=TRUE)
// 		{
// 			goto isenda;
// 		}
		//internetwritefile2
		allreadywritelen=0;
		while(allreadywritelen<readlen)
		{
			if (!downstate)//end
			{
				downstate=TRUE;
				goto isenda;
			}
			if (readlen-allreadywritelen>=8192)
			{
				readytowritelen=8192;
			}
			else
			{
				readytowritelen=readlen-allreadywritelen;
			}

			if (InternetWriteFile(hRequest, buf+allreadywritelen, readytowritelen, &dwRead)!=TRUE)
			{
					goto isenda;
			}
			allreadywritelen+=dwRead;
			Sleep(200);

		}
		//wait
		WaitForSingleObject(g_hEvent,INFINITE);
		if (!downstate)//end
		{
			downstate=TRUE;
			goto isenda;
		}
	} while (!feof(fp));

isenda:
	fclose(fp);
	delete[]buf;
	CloseHandle(hRequest);
	CloseHandle(hConnection);
	CloseHandle(hInternet);
	CloseHandle(g_hEvent);

	return 0;
}

B端socket代码

		while(1)
		{
			SOCKADDR_IN addrClient;
			len=sizeof(SOCKADDR);
			ssss1=INVALID_SOCKET;
			if ( ( ssss1=accept( sockSrv,(SOCKADDR *)&addrClient,&len ) ) != INVALID_SOCKET )
			{
				memset(ipoutside,0,sizeof(ipoutside));
				strcpy(ipoutside,inet_ntoa(addrClient.sin_addr));
				HANDLE hThread2;
				hThread2=CreateThread(NULL,0,fRecvThread,LPVOID(ssss1),0,NULL);
				CloseHandle(hThread2);
				Sleep(5);
			}
			else
			{
				if (GetLastError()==10038)
				{
					cout<<"client not online"<<endl;
					break;
				}
			}

			
		}
fRecvThread（）...........