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POC++ sockets connecting to C# server
 

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  1. POC++ sockets connecting to C# server
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    <p>I have a server written in C# using a TcpClient and streams. When I try to connect to it and receive data with a C++ application using Winsock, I can receive the data but it has the data but it also displays a bunch of other data. By the way I'm printing to buffer to the console using cout. </p> <p>If you want to see what the server is supposed to send, go to <a href="http://onenetworks.us:12345" rel="nofollow noreferrer">http://onenetworks.us:12345</a>. There the server will send you a string. For me it sends "16READY" Which is what I'm trying to get my client to only read.</p> <p><img src="https://i.stack.imgur.com/VlWe6.png" alt="What is displayed when you connect."></p> <p>Here's my code, I copied a working code file off of the MSDN page.</p> <pre><code> #define WIN32_LEAN_AND_MEAN #include &lt;winsock2.h&gt; #include &lt;Ws2tcpip.h&gt; #include &lt;stdio.h&gt; #include &lt;iostream&gt; // Link with ws2_32.lib #pragma comment(lib, "Ws2_32.lib") #define DEFAULT_BUFLEN 512 #define DEFAULT_PORT "12345" int main() { //---------------------- // Declare and initialize variables. WSADATA wsaData; int iResult; SOCKET ConnectSocket = INVALID_SOCKET; struct sockaddr_in clientService; char *sendbuf = ""; char recvbuf[DEFAULT_BUFLEN]; int recvbuflen = DEFAULT_BUFLEN; //---------------------- // Initialize Winsock iResult = WSAStartup(MAKEWORD(2,2), &amp;wsaData); if (iResult != NO_ERROR) { printf("WSAStartup failed: %d\n", iResult); return 1; } //---------------------- // Create a SOCKET for connecting to server ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (ConnectSocket == INVALID_SOCKET) { printf("Error at socket(): %ld\n", WSAGetLastError() ); WSACleanup(); return 1; } //---------------------- // The sockaddr_in structure specifies the address family, // IP address, and port of the server to be connected to. clientService.sin_family = AF_INET; clientService.sin_addr.s_addr = inet_addr( "199.168.139.14" ); clientService.sin_port = htons( 12345 ); //---------------------- // Connect to server. iResult = connect( ConnectSocket, (SOCKADDR*) &amp;clientService, sizeof(clientService) ); if ( iResult == SOCKET_ERROR) { closesocket (ConnectSocket); printf("Unable to connect to server: %ld\n", WSAGetLastError()); WSACleanup(); return 1; } // Send an initial buffer iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 ); if (iResult == SOCKET_ERROR) { printf("send failed: %d\n", WSAGetLastError()); closesocket(ConnectSocket); WSACleanup(); return 1; } printf("Bytes Sent: %ld\n", iResult); // shutdown the connection since no more data will be sent iResult = shutdown(ConnectSocket, SD_SEND); if (iResult == SOCKET_ERROR) { printf("shutdown failed: %d\n", WSAGetLastError()); closesocket(ConnectSocket); WSACleanup(); return 1; } // Receive until the peer closes the connection do { iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0); std::cout &lt;&lt; recvbuf &lt;&lt;std::endl; if ( iResult &gt; 0 ) printf("Bytes received: %d\n", iResult); else if ( iResult == 0 ) printf("Connection closed\n"); else printf("recv failed: %d\n", WSAGetLastError()); } while(iResult &gt; 0); // cleanup closesocket(ConnectSocket); WSACleanup(); std::cin.ignore(); //return 0; } </code></pre>
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    1. COYour cout (here: `std::cout << recvbuf <<std::endl;`) needs to only output to a specific length because your message is not likely null terminated.
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    2. COWhat should i do?
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    3. COMaybe this could help: http://cboard.cprogramming.com/cplusplus-programming/74737-cout-fixed-length-string.html
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