simple client/server problems

etsuja · 2006-05-22T16:52:22

I'm trying to make a simple client and server with UDP but am running into issues. Here's what I'm doing. I get the server setup fine and loop a recvfrom() function. Then I run my client which calls a sendto() function however my server never recieves anything if anyone could help it would be much appreciated. Here's some of my code On my server this function is called at initialisation void SetupLoginConnection() { int iResult = WSAStartup( MAKEWORD(2,2), &wsaData ); if ( iResult != NO_ERROR ) { AddString(TEXT("Error at WSAStartup()")); } UDPSocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP); if ( UDPSocket == INVALID_SOCKET ) { AddString(TEXT("Error at socket():")); closesocket(UDPSocket); WSACleanup(); return; } sockaddr_in service; hp = gethostbyname("localhost"); service.sin_family = AF_INET; service.sin_addr.s_addr = inet_addr("127.0.0.1"); service.sin_port = htons(32459); if ( bind( UDPSocket, (SOCKADDR*) &service, sizeof(service) ) == SOCKET_ERROR ) { AddString(TEXT("bind() failed.")); closesocket(UDPSocket); WSACleanup(); return; } AddString(TEXT("Waiting for request on port:")); } Then this function is called in the main server loop void SendRcv() { char inbuffer[256]; int test; int len = sizeof(SOCKADDR); memset(inbuffer, '\0', 256); if(test = recvfrom(UDPSocket, inbuffer, 256, 0, NULL, &len) >= 0) { AddString(TEXT("Packets recieved!")); MessageBox(NULL, NULL, TEXT("Incoming Data"), MB_OK); } if(test == SOCKET_ERROR) { MessageBox(NULL, NULL, TEXT("FUCK!!"), MB_OK); } } Now here's my client main function int _tmain(int argc, char* argv[]) { int iResult = WSAStartup( MAKEWORD(2,2), &wsaData ); if ( iResult != NO_ERROR ) { printf("error"); } UDPSocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP); if ( UDPSocket == INVALID_SOCKET ) { printf("socket error"); WSACleanup(); return 1; } sockaddr_in service; service.sin_family = AF_INET; service.sin_addr.s_addr = inet_addr("127.0.0.1"); service.sin_port = htons(32459); char buffer[256]; int len = sizeof(SOCKADDR); int test; strcpy(buffer,"HELLO!!!"); test = sendto(UDPSocket, buffer, sizeof(buffer), 0, (SOCKADDR *)&service, sizeof(SOCKADDR)); if(test == SOCKET_ERROR) { printf("no data sent"); } if((test == SOCKET_ERROR) || (test < 0)) { printf("FUCK!!"); } else { printf("%s sent",buffer); } closesocket(UDPSocket); WSACleanup(); return 0; }

Networking and Multiplayer Programming

Started by etsuja May 22, 2006 04:50 AM

11 comments, last by etsuja 18 years, 9 months ago

Cajun

122

May 22, 2006 04:20 PM

The Line:

if(test = recvfrom(UDPSocket, inbuffer, 256, 0, NULL, &len) >= 0)

change to:

if((test = recvfrom(UDPSocket, inbuffer, 256, 0, NULL, &len)) >= 0)

NOTE: The added parens. Order of operations.

etsuja

Author

100

May 22, 2006 04:33 PM

I don't know if routing is an issue since I don't have a router. are they not getting packets since I don't have a send and a recieve in both of them? I tried putting winsock.h in head of the windows header and the same stuff happens and I'm linking to ws2_32.lib, is it possible it's not working because I'm trying it with the debug version?

Artist 1st - Programmer 2nd(I'll get some material linked here sometime to support these claims, haha)

etsuja

Author

100

May 22, 2006 04:52 PM

hallelujah! I finally got it working. It was because I was running the debug version.

Artist 1st - Programmer 2nd(I'll get some material linked here sometime to support these claims, haha)

simple client/server problems

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simple client/server problems

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