i'm new programmer, plz help me in DATAGRAM

[zagaa]

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


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();
}

[Richard.J]

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

[zagaa]

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

sincerely
zagaa