hello friends,

I have two program: receive.cpp and send.cpp

They re very simple, when compiling there is no error in both.

I only wanna see them to talk to each other but when run these progs,

both of them gives 10061 error. Below the codes, firstly receive.cpp:

//*******************  SERVER PROG ****************

#include <winsock2.h>
#include <stdio.h>

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"

int __cdecl main() {

    
   
    WSADATA wsaData;
    int iResult;

    SOCKET ConnectSocket;
    struct sockaddr_in clientService; 

    char *sendbuf = "bu bir testtir.";
    char recvbuf[DEFAULT_BUFLEN];
    int recvbuflen = DEFAULT_BUFLEN;
  
    
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != NO_ERROR) {
      printf("WSAStartup failed: %d\n", iResult);
      return 1;
    }

    
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        printf("Error at socket(): %ld\n", WSAGetLastError() );
        WSACleanup();
        return 1;
    }

    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr( "127.0.0.1" );
    clientService.sin_port = htons( 27015 );

    
    iResult = connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) );
    if ( iResult == SOCKET_ERROR) {
        closesocket (ConnectSocket);
        printf("Unable to connect to server: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    
    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );
    if (iResult == SOCKET_ERROR) {
        printf("send failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        //WSACleanup();
        return 1;
    }

    printf("Bytes Sent: %ld\n", iResult);

    
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }


    do {

        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 )
            printf("Bytes received: %d\n", iResult);
        else if ( iResult == 0 )
            printf("Connection closed\n");
        else
            printf("recv failed: %d\n", WSAGetLastError());

    } while( iResult > 0 );

    
    closesocket(ConnectSocket);
    WSACleanup();

    return 0;
}

and the sender.cpp

//*******************************CLIENT*********************************
#include <winsock2.h>
#include <stdio.h>

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT 27015

int main() {

    
    int iResult;
    WSADATA wsaData;

    SOCKET ConnectSocket;
    struct sockaddr_in clientService; 

    int recvbuflen = DEFAULT_BUFLEN;
    char *sendbuf = "Client: sending data test";
    char recvbuf[DEFAULT_BUFLEN] = "";

    
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != NO_ERROR) {
        printf("WSAStartup failed with error: %d\n", iResult);
        return 1;
    }

    
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        printf("socket failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    
    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr( "127.0.0.1" );
    clientService.sin_port = htons( DEFAULT_PORT );

    
    iResult = connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) );
    if (iResult == SOCKET_ERROR) {
        printf( "connect failed with error: %d\n", WSAGetLastError() );
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
  }

    
    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );
    if (iResult == SOCKET_ERROR) {
        printf("send() failed with error: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    printf("Bytes Sent: %d\n", iResult);

    
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed with error: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

   
    do {

        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 )
            printf("Bytes received: %d\n", iResult);
        else if ( iResult == 0 )
            printf("Connection closed\n");
        else
            printf("recv failed with error: %d\n", WSAGetLastError());

    } while( iResult > 0 );


    closesocket(ConnectSocket);
    WSACleanup();

    return 0;
}

where I do wrong?

thanks my friend, I read the note but I still cant solve the problem.

my LAN ip is <snip>
I wonder that: if I must change the adress in the both program codes
to that ip or it must stay the same "127.0.0.1" ?

don't know --- try 127.0.0.1 and find out if it fixes your problem.

I tried to change ip adresses but it still doesnt work

I do not see any Listen for port number in any of the applications ?
if you have setup listening for the ports in some way I do not know about, then perhaps your problem could be Firewall or Antivirus program blocking the attempt to connect to port

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