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<html><head><meta http-equiv="Content-Language" content="en-us"><meta http-equiv="Content-Type" content="text/html; charset=windows-1252"><title>UDT Reference</title></head><body><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="table1" bgcolor="#99CCFF" bordercolor="#99CCFF"> <tr> <td width="100%"><font face="Verdana" size="2"><i> UDT </i></font><i> <font face="Verdana" size="2">Tutorial</font></i></td> </tr></table><h1><font face="Verdana" size="4">Transfer files using UDT</font></h1><p><font face="Verdana" size="2">Files can be sent or received at any time once the UDT connection is established. There is NO non-blocking mode for file sending or receiving, no matter how the <a href="opt.htm">UDT_SNDSYN</a> and<a href="opt.htm">UDT_RCVSYN</a> options are set.</font></p><p><font face="Verdana" size="2">In UDT, file transfer uses C++ <u>fstream</u> standard class to handle the files. The following examples show the usage of<a href="sendfile.htm">sendfile</a> and <a href="recvfile.htm">recvfile</a>.</font></p><h4><font face="Verdana" size="2">Example: send a file using UDT</font></h4><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="table2" bgcolor="#C0C0C0" bordercolor="#C0C0C0"> <tr> <td width="100%"> <p style="margin-top: 0; margin-bottom: 0"> <font size="1" face="Courier New"> UDTSOCKET fhandle;</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">...</font></p> <p style="margin-top: 0; margin-bottom: 0"> </p> <p style="margin-top: 0; margin-bottom: 0"><font size="1" face="Courier New"> ifstream& ifs("largefile.dat");</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font size="1" face="Courier New">ifs.seekg(0, ios::end);</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">int64_t size = ifs.tellg();</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font size="1" face="Courier New">ifs.seekg(0, ios::beg);</font></p> <p style="margin-top: 0; margin-bottom: 0"> </p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">if (UDT::ERROR == UDT::sendfile(fhandle, ifs, 0, size))<br> {<br> cout << "sendfile: " << UDT::getlasterror().getErrorMessage();<br> return 0;<br> }</font></p> </td> </tr></table><h4><font face="Verdana" size="2">Example: receive data into a file using UDT</font></h4><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="table3" bgcolor="#C0C0C0" bordercolor="#C0C0C0"> <tr> <td width="100%"> <p style="margin-top: 0; margin-bottom: 0"> <font size="1" face="Courier New"> UDTSOCKET recver;</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">...</font></p> <p style="margin-top: 0; margin-bottom: 0"> </p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">ofstream& ofs("largefile.dat");</font></p> <p style="margin-top: 0; margin-bottom: 0"> </p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">if (UDT::ERROR == UDT::recvfile(fhandle, ofs, 0, size))<br> {<br> cout << "recvfile: " << UDT::getlasterror().getErrorMessage();<br> return 0;<br> }</font></p></td> </tr></table><p style="margin-top: 0; margin-bottom: 0"> </p><p style="margin-top: 0; margin-bottom: 0"><font face="Verdana" size="2">Note that a sent file is not necessarily received by <a href="recvfile.htm">recvfile</a>, and vice versa. Also note that fstream in GCC 3.0 does NOT support large file(> 2GB) and please use other versions of GCC to compile UDT if you need largefile support.</font></p></body></html>⌨️ 快捷键说明
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