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(Unicode C) Transfer a File using Sockets (TLS or non-TLS)Demonstrates how to two programs, one a socket writer and the other a socket reader, can transfer a file. The connection can be TLS or a regular non-encrypted TCP connection.
#include <C_CkBinDataW.h> #include <C_CkSocketW.h> void ChilkatSample(void) { HCkBinDataW bdToSend; BOOL success; HCkSocketW sndSock; BOOL bUseTls; int port; int maxWaitMs; int numBytes; BOOL bBigEndian; HCkSocketW listenSock; HCkSocketW rcvSock; int numBytesComing; HCkBinDataW bdReceived; int maxWaitMs; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // On the sending side, we'll load the file into a BinData object and send. // On the receiving side, we'll read from the socket connection into a BinData, and save to a file. // This example assumes the file is not crazy-large, and that the entire contents // can fit into memory. // (If the file is too large for memory, there are other ways to send. It just involves streaming or // sending the file chunk-by-chunk..) // This section of code is for the sender. bdToSend = CkBinDataW_Create(); success = CkBinDataW_LoadFile(bdToSend,L"somePath/someFile.dat"); // Assume success for the example... sndSock = CkSocketW_Create(); bUseTls = TRUE; port = 5555; maxWaitMs = 5000; success = CkSocketW_Connect(sndSock,L"some_domain_or_ip.com",port,bUseTls,maxWaitMs); // Assume success for the example... // Tell the receiver how many bytes are coming. numBytes = CkBinDataW_getNumBytes(bdToSend); bBigEndian = TRUE; success = CkSocketW_SendInt32(sndSock,numBytes,bBigEndian); // Send the file data (sends the entire contents of bdToSend). success = CkSocketW_SendBd(sndSock,bdToSend,0,0); // Get an acknowledgement. success = CkSocketW_ReceiveInt32(sndSock,bBigEndian); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(sndSock)); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); return; } // Did the receiver get the correct number of bytes? if (CkSocketW_getReceivedInt(sndSock) != numBytes) { wprintf(L"The receiver did not acknowledge with the correct number of bytes.\n"); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); return; } wprintf(L"File sent!\n"); // ------------------------------------------------------------------------------------ // The code below is for the receiving side (running on some other computer..) listenSock = CkSocketW_Create(); success = CkSocketW_BindAndListen(listenSock,5555,25); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(listenSock)); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); CkSocketW_Dispose(listenSock); return; } // Get the next incoming connection // Wait a maximum of 20 seconds (20000 millisec) rcvSock = CkSocketW_AcceptNextConnection(listenSock,20000); if (CkSocketW_getLastMethodSuccess(listenSock) == FALSE) { wprintf(L"%s\n",CkSocketW_lastErrorText(listenSock)); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); CkSocketW_Dispose(listenSock); return; } // The sender will first send the big-endian integer for the number of bytes // that are forthcoming.. success = CkSocketW_ReceiveInt32(rcvSock,bBigEndian); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(rcvSock)); CkSocketW_Dispose(rcvSock); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); CkSocketW_Dispose(listenSock); return; } numBytesComing = CkSocketW_getReceivedInt(rcvSock); // Receive that many bytes.. bdReceived = CkBinDataW_Create(); success = CkSocketW_ReceiveBdN(rcvSock,numBytesComing,bdReceived); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(rcvSock)); CkSocketW_Dispose(rcvSock); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); CkSocketW_Dispose(listenSock); CkBinDataW_Dispose(bdReceived); return; } // Acknowledge the sender by sending back the number of bytes we received. success = CkSocketW_SendInt32(rcvSock,CkBinDataW_getNumBytes(bdReceived),bBigEndian); // Close the connection. maxWaitMs = 20; CkSocketW_Close(rcvSock,maxWaitMs); CkSocketW_Dispose(rcvSock); // Save the received data to a file. success = CkBinDataW_WriteFile(bdReceived,L"somePath/someFile.dat"); // Assume success for the example... wprintf(L"File received!\n"); CkBinDataW_Dispose(bdToSend); CkSocketW_Dispose(sndSock); CkSocketW_Dispose(listenSock); CkBinDataW_Dispose(bdReceived); } |
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