sendto(); question.
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Feel free to correct me at any time as I am still trying my best to learn this API. I know that there is a SOCKADDR structure that is able to hold data and family type. I also know that there is a SOCKADDR_IN structure that is able to hold an address, a port number, data and a family type. I have a sendechorequest function set up like this int CSSPingDlg::SendEchoRequest(SOCKET s, SOCKADDR_IN lpstToAddr); Now comes the interesting part. Inside this SendEchoRequest function I make a call to the sendto() function. What I take issue with is the fifth parameter of sendto(); which requires a SOCKADDR * that is supposed to contain the address of the host to which to send the data. The problem is that my ping program requires that I use a SOCKADDR_IN structure which is able to hold important information like the IP address of the host. Is there a version of sendto(); that will allow me to pass a SOCKADDR_IN instead of a plain SOCKADDR? Could it be that I am just not using sendto(); correctly. All I know is that I want to send data to the host specified in the SOCKADDR_IN structure that I have passed to my sendechorequest function. How do I do that?
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Feel free to correct me at any time as I am still trying my best to learn this API. I know that there is a SOCKADDR structure that is able to hold data and family type. I also know that there is a SOCKADDR_IN structure that is able to hold an address, a port number, data and a family type. I have a sendechorequest function set up like this int CSSPingDlg::SendEchoRequest(SOCKET s, SOCKADDR_IN lpstToAddr); Now comes the interesting part. Inside this SendEchoRequest function I make a call to the sendto() function. What I take issue with is the fifth parameter of sendto(); which requires a SOCKADDR * that is supposed to contain the address of the host to which to send the data. The problem is that my ping program requires that I use a SOCKADDR_IN structure which is able to hold important information like the IP address of the host. Is there a version of sendto(); that will allow me to pass a SOCKADDR_IN instead of a plain SOCKADDR? Could it be that I am just not using sendto(); correctly. All I know is that I want to send data to the host specified in the SOCKADDR_IN structure that I have passed to my sendechorequest function. How do I do that?
From MSDN doc of sendto()
The Microsoft TCP/IP Sockets Developer’s Kit only supports the Internet address domains. To actually fill in values for each part of an address, you use the SOCKADDR_IN data structure, which is specifically for this address format. The SOCKADDR and the SOCKADDR_IN data structures are the same size. You simply cast to switch between the two structure types.Steve