TCP/IP 如何判断多包数据已收完

Question

现在要在程序里加入数据接收完毕的标志，程序如下，我该怎么判断一次性发了多包数据，数据已接收完毕

while (1)
{

    bytesRead = ServerTCPRead (clientInfoPtr->handle, dataBuf, sizeof (dataBuf) - 1, 2000);  
   
    GetTCPPeerAddr (clientInfoPtr->handle, peerAddress, sizeof (peerAddress)); 
    
    if (bytesRead > 0)
    {
        
        dataBuf [bytesRead] = '\0';
        
        GetTCPPeerName (clientInfoPtr->handle, peerName, sizeof (peerName));

        GetSystemDate (&month, &day, &year);
        GetSystemTime (&hour,&minute,&second);
        sprintf(datetime,"%4d%02d%02d%02d%02d%02d",year,month,day,hour,minute,second);

        if (strcmp(peerAddress,"192.168.1.157")==0)
        {
            char readData[5001];
            CmtGetLock(lock);
            memcpy(readData,dataBuf,5001);
            CmtReleaseLock(lock);
            NBearingInfo     *nbearingInfo=readData;

           sprintf(sqlcommand,"insert into  nbearinginfo values('%.4f','%.4f','%s','%s','%s','%s','%s','%s','%s','%s','%s')",nbearingInfo->setvalue,nbearingInfo->value,nbearingInfo->angle,nbearingInfo->spe,nbearingInfo->date,nbearingInfo->test,nbearingInfo->type,nbearingInfo->number,nbearingInfo->codename,nbearingInfo->name,datetime); //获取实时数据显示并存入数据库中
           
           mysql_real_query(&conn,sqlcommand,strlen(sqlcommand));
            int i=0;
            GetNumTableRows (TabPanelHandlern, NPANEL_TABLE,&i );
            if(i>=10)
            DeleteTableRows (TabPanelHandlern, NPANEL_TABLE,i,1);
            
            InsertTableRows (TabPanelHandlern, NPANEL_TABLE,1 , 1, VAL_USE_MASTER_CELL_TYPE);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(1,1),nbearingInfo->setvalue);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(2,1),nbearingInfo->value);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(3,1),nbearingInfo->angle); 
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(4,1),nbearingInfo->spe); 
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(5,1),nbearingInfo->date);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(6,1),nbearingInfo->test);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(7,1),nbearingInfo->type);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(8,1),nbearingInfo->number);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(9,1),nbearingInfo->codename);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(10,1),nbearingInfo->name);
            SetTableCellVal (TabPanelHandlern, NPANEL_TABLE,MakePoint(11,1),datetime); 
        } 
    }
}

发送程序是一次发送多行数据（多少数据无法确定，同时也可能有多个发送程序同时向接收程序发送），接收程序是一行一行进行接收，分多次接收完毕，如何判断多行数据已接收完毕，同时向发送程序发送接收完成的标志。

Answer 1

1.如果有多个客户端连接，那你的服务端也应该是多个socket对象来建立连接，你应该给每个对象一个单独的线程来接收数据，而不是全部使用同一个线程
2.如果约定的通信协议里并没有数据长度，也没有规定好超时时间，而是随时可以发送数据，那你只能判断连接什么时候断开就算是发完了，只要没断开永远判断不了对方是否发完了