i'm new programmer, plz help me in DATAGRAM

i make client server application in DATAGRAM. but if server waiting data to recieve cannot send data. it cannot work like thread. i know "recvfrom" is waiting data comming. but i cannot check data is coming or not. i dont know how i check it. i readed in "CAsyncSocket" it have "onRecieve" function can be used. but in here how i can?. plz help me. thanks

zagaa

Code:

---

int CUDPServer::Run()
{
        SOCKET                sockfd;
        int                n;
        SOCKADDR_IN        servaddr, cliaddr;
    char                        mesg[100];
    int sin_size = sizeof(struct sockaddr_in);
        int mBind;
        DWORD mRet = 0x01L;

        if (ConInitialize() == FALSE)
                return 0;

        sockfd = socket(AF_INET, SOCK_DGRAM, 0);

        servaddr.sin_family      = AF_INET;
        servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
        servaddr.sin_port        = htons(SERVER_PORT);
        memset(&(servaddr.sin_zero), 0, 8);

        mBind =  bind(sockfd, (LPSOCKADDR) &servaddr, sizeof(servaddr));

        while(1)
        {
                if (mSendBool == FALSE && mRecvBool == FALSE)
                        Sleep(1);

                // transiver
                if (mSendBool == TRUE)
                {
                        strcpy(mesg, mSendStr);
                        sendto(sockfd, mesg, strlen(mesg), 0, (LPSOCKADDR) &cliaddr,  sin_size);
                        mSendBool = FALSE;
                }
                // reciever
                //mRet = WaitForMultipleObjects(sockfd, 50);
                if (mRecv == TRUE)
                {
                        n = recvfrom(sockfd, mesg, 100, 0,(LPSOCKADDR) &cliaddr,  &sin_size);
                        if (n > 0)
                        {
                                mesg[n] = '\0';
                                mRecvStr.Format("%s", mesg);
                                mRecvBool = FALSE;
                        }
                }
        }
        return CWinThread::Run();
}

---

inside your while-loop, use select() with a timeout. That way, you can also get rid of the Sleep().

if select() returns, either there is some data to be received or the timeout occurred.

HTH,
Richard

Thank you i used select. it works good. Thank you agian.

sincerely
zagaa