socket connect returning odd

I am trying to do a simple socket connect and test whether my connection succeeds or not. My reading tells me that connect upon failure should return the value of -1. I disabled the device and I am attempting to connect to, and yet my program still says the connection was successful. So I know I've goofed at this point. Does anyone see anything wrong with my testing or have just got my socket setup wrong..... Thanks for any help-

Code:

---

//we will need variables to hold the client socket.
    //thus we declare them here.
        cout <<"opening client socket"<<endl;
    SOCKET client;
        client=socket(AF_INET,SOCK_DGRAM,0);
    sockaddr_in from;
//        memset((char *) &from,0,sizeof(from));
        from.sin_family=AF_INET;
        from.sin_addr.s_addr=inet_addr ("172.20.30.30");
        from.sin_port=htons((u_short)6101);
    int fromlen=sizeof(from);

        //connect to printer
        if ((connect (client, (struct sockaddr*)&from, sizeof from)==-1))
        {
                cout <<"client connect failed"<<endl;
               
        }
        else if ((connect (client, (struct sockaddr*)&from, sizeof from)!=-1))
        {
                cout <<"client connection successful"<<endl;
               
        }

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connect is used with contection oriented sockets such as SOCK_STREAM, datagram sockets are connectionless.

Code:

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if ((connect (client, (struct sockaddr*)&from, sizeof from)==-1))
        {
                cout <<"client connect failed"<<endl;
               
        }
        else if ((connect (client, (struct sockaddr*)&from, sizeof from)!=-1))
        {
                cout <<"client connection successful"<<endl;
               
        }

---

here you try to connect twice you just need

Code:

---

if ((connect (client, (struct sockaddr*)&from, sizeof from)==-1))
        {
                cout <<"client connect failed"<<endl;
               
        }
        else
        {
                cout <<"client connection successful"<<endl;
               
        }

---

good point that makes alot of sense, I am connecting twice....

I need to use a datagram based socket, is there anyway to do a connect to push this data using datagram or can I just simply use a send command to push to a defined socket?

I know DGRAM is not preferred but the device I am writing requires a udp based connection and send.....

Thanks for your code response I am now getting a connection failed message!

To use a datagram socket use sendto()/recvfrom().

I'll give it a shot thanks again! I'll post success or failures.

Bummer.... not much going on, I'm not sure if the connect() command will work with DGRAM settings or not, but I do not seem to be pushing anything to the ip and port I am trying to reach.

Kinda bummed. the sendto() command does not appear to work, I can paste and copy the same file data with a telnet session to the device on the ip and port and get the response I want, but when my socket app no luck.

I tried to start from scratch and just make a client program that attaches to a server and drops the data, but still nothing happening...

Code:

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int sockfd;
    struct sockaddr_in dest_addr;  // will hold the destination addr

        sockfd = socket(AF_INET, SOCK_DGRAM, 0); // do some error checking!

    dest_addr.sin_family = AF_INET;          // host byte order
    dest_addr.sin_port = htons(DEST_PORT);  // short, network byte order
    dest_addr.sin_addr.s_addr = inet_addr(DEST_IP);
    memset(&(dest_addr.sin_zero), '\0', 8);  // zero the rest of the struct
sendto (sockfd, barCode, strlen(barCode), 0, (struct sockaddr*)&dest_addr, sizeof dest_addr);

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how can I verify connection to my client or server using DGRAM??? Thanks-