socket-connection oriented-winsock

[vanip]

Hi , I am infancy to socket programming .I need to connect to an external device through terminalserver4 and i should be able to send command & receive output. Using the following code, i am able to send data to the external device from the two send functions and able to receive data from only the first recv function. The program is blocking at the second recv function. Please check the following code and help me if anywhere went wrong. #define DEST_IP "10.10.1.1" #define DEST_PORT 2001 void CSocktestDlg::process() { WSADATA wsaData; if(WSAStartup(MAKEWORD(1,1),&wsaData)!=0) { AfxMessageBox("WSAStartup failed",MB_OK); exit(1); } else { //AfxMessageBox("WSAStartup succeeded",MB_OK); } int sockfd; struct sockaddr_in dest_addr; //Establishing socket sockfd=socket(AF_INET,SOCK_STREAM,0); dest_addr.sin_family=AF_INET; dest_addr.sin_port=htons(DEST_PORT); dest_addr.sin_addr.s_addr=inet_addr(DEST_IP); memset(&(dest_addr.sin_zero),'\0',8); //For connecting if(connect(sockfd,(struct sockaddr *)&dest_addr,sizeof(struct sockaddr))==0) { //AfxMessageBox("Connected to remote system successfully",MB_OK); } else { AfxMessageBox("Unable to connect to remote machine",MB_OK); } //For sending data CString code= "2,76,69,68,77,73,44,73,77,68,69,73,77,68,69,0,217,105,3"; int len,bytes_sent,n,i; CTokenEx CtlArraySpliter; CStringArray strArray; CtlArraySpliter.Split(code,",",strArray,TRUE); for(i = 0; i < strArray.GetSize(); i++ ) { //len=strArray.GetAt(i).GetLength(); n = atoi(strArray.GetAt(i)); bytes_sent=send(sockfd,(char *) &n,sizeof(int),0); } strArray.RemoveAll(); AfxMessageBox("Sent message through socket to remote IP",MB_OK); Sleep(5000);

[includeh10]

in general, each waiting function (such as recv()) should be put in a thread, because u don't know if or when other-side sends message to you. so create threads for your waiting functions.

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[vanip]

here, i think there is no waiting problem.Because the external device sends message immediately after sending command code. Is there any other wrong in my code? For the first time it is responding immediately. For the second time not.