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POSending image over network c++
 

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  1. POSending image over network c++
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    <p>I have problem sending image over the network. but I keep getting error Sending From Client to Server</p> <pre><code>( "msvcr110d.dll" Access violation writing location mov [edi],edx ; store one more dword c++) </code></pre> <p>Any idea what is wrong.</p> <p>Platform: Windows 7 Visual studio c++ 2012 Express C++</p> <p>Send &amp; Receive Message</p> <pre><code>( string ReceiveMyMessage(SOCKET s1) { exception e; try { ZeroMemory(szbuffer,strlen(szbuffer)); if((ibytesrecv = recv(s1,szbuffer,100,0)) == SOCKET_ERROR) throw "Receive error in server program\n"; return ((string) szbuffer); } catch(exception e) { </code></pre> <p>cout&lt;&lt;"Seems Client is Down!\n(SendMyMessage) Error While trying to executing recv command!"&lt; <p>Client Code:</p> <pre><code>void SendStreamFile() { _get_printf_count_output(); struct stat myFileState; int Filesize = 0; char * myDATA; FILE *f = fopen(FileName.c_str(),"rb"); Filesize = (int) myFileState.st_size; myDATA = (char *) malloc(sizeof(char) * Filesize); fread(myDATA,1,Filesize,f); fclose(f); SendMyMessage(to_string( Filesize)); char * ptr; string strToSend = ""; for (int x = 0; x &lt; Filesize; ) { ptr = &amp;myDATA[x]; strToSend.assign(ptr,20); Sleep(100); //cout &lt;&lt; strToSend &lt;&lt;endl; SendMyMessage(strToSend); x = x + 20; cout &lt;&lt; x &lt;&lt; " - " &lt;&lt; Filesize &lt;&lt;endl; } SendMyMessage("*D*"); free(myDATA); } </code></pre> <p>Server Code:</p> <pre><code>void ReceiveClientFileStream(string FileName, SOCKET s1) { string Fsize = ReceiveMyMessage(s1); int Filesize = 0; Filesize= atoi(Fsize.c_str()); char * myDATA; myDATA = new char[Filesize]; cout &lt;&lt; strlen(myDATA) &lt;&lt; Filesize &lt;&lt;endl; //SendMyMessage(to_string( Filesize),s1); //char * ptr = &amp;myDATA[0]; string str = ""; // ZeroMemory(myDATA,Filesize); do { str = ReceiveMyMessage(s1); cout &lt;&lt; str &lt;&lt; endl; if (str.find("*D*") == string::npos) strcat(myDATA,str.c_str()); else { strcat(myDATA,str.substr(str.length()-3, str.length()).c_str()); break; } }while(1); FILE * fil; fil = fopen(FileName.c_str(),"wb"); fwrite(myDATA,sizeof(char),strlen(myDATA),fil); free(myDATA); } </code></pre>
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    1. COStart by paying attention to the warnings that the compiler sends; for example, myFileState in SendStreamFile() is used without initialization and therefore the file length you use is wrong.
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    2. COThe problem the compiler does't give any error or warnings. and I cant find the source of the error. I changed thinking about memory allocation issues but it should be fine. I am suspecting the server can't handle the amount of data being sent(could it be ASCII or something coz the cout << strlen(myDATA) << Filesize <<endl; Filezie output 442d3). On the order hand seems the server or client grouping messages then it send them. if i read last line from a file then executed send it will send it with the *D* which is another problem.
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    3. COForgot to mention something, the server receive some of the messages then randomly crash like 1st time it crashed like 2000 message where sent to it next time it was less and other timme more
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