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POSend a structure through a socket using tpl for serialization using c
 

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  1. POSend a structure through a socket using tpl for serialization using c
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    <p>After reading a few related questions I've decided to use the <a href="http://tpl.sourceforge.net/" rel="nofollow noreferrer">tpl library</a> to serialize my structures in order to send and receive them through sockets. I'm having trouble understanding how to send and receive the tpl images using sockets. I get a segfault error on the server side when I call the <code>tpl_dump</code> function. </p> <p>I know the sockets are working on both end because I was using the code to previously send strings back and forth. I was also able to use tpl to create and read an tpl image on the client without any issues.</p> <p>This isn't the structure I eventually want to be sending back and forth, but I hope to figure this sample out so I can do this in the future. I know I'm mishandling something between the incoming buffer and the <code>tpl_dump</code>. I'm still learning C (as evidenced by my previous questions) so I apologize if I have glaring errors in my code.</p> <p><strong>Edits</strong> The issues Nikolai pointed out have been corrected in the code below. However the server code logs <code>error: tpl_load to non-root node</code> and still segfaults at <code>tpl_unpack(tn, 0);</code></p> <p>Client Code:</p> <pre><code>tpl_node *tn; void *addr; size_t len; struct ci { char c; int i; }; struct ci sample = {'a', 1}; tn = tpl_map("S(ci)", &amp;sample); /* pass structure address */ tpl_pack(tn, 0); tpl_dump(tn, TPL_MEM, &amp;addr, &amp;len ); tpl_free(tn); send(sockfd, addr, len, 0); </code></pre> <p>Server Code:</p> <pre><code>if ((nbytes = recv(i, buf, sizeof buf, 0)) &lt;= 0) { //error handling } else { tpl_node *tn; struct ci { char c; int i; }; struct ci recieve; tpl_map("S(ci)", &amp;recieve); tpl_load(tn, TPL_MEM, &amp;buf, &amp;nbytes ); tpl_unpack(tn, 0); tpl_free(tn); </code></pre> <p>In case this will come in handy - <a href="http://tpl.sourceforge.net/userguide.html" rel="nofollow noreferrer">tpl user's guide</a></p>
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