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(Unicode C) Send and Receive WebSocket FrameDemonstrates how to send a websocket text frame to a websocket echo server. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx
Note: The websockets.chilkat.io server imposes the following limitations:
#include <C_CkWebSocketW.h> #include <C_CkRestW.h> void ChilkatSample(void) { HCkWebSocketW ws; HCkRestW rest; BOOL success; const wchar_t *responseBodyIgnored; BOOL finalFrame; const wchar_t *receivedStr; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. ws = CkWebSocketW_Create(); // For brevity, this example does not check for errors when etablishing the WebSocket connection. // See Establish WebSocket Connection for more complete sample code for making the connection. rest = CkRestW_Create(); // Connect to websockets.chilkat.io // IMPORTANT: websockets.chilkat.io accepts frames of up to 16K in size and echoes them back. // IMPORTANT: The websockets.chilkat.io server imposes the following limitations: // ---------- Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages. success = CkRestW_Connect(rest,L"websockets.chilkat.io",80,FALSE,FALSE); CkWebSocketW_UseConnection(ws,rest); CkWebSocketW_AddClientHeaders(ws); responseBodyIgnored = CkRestW_fullRequestNoBody(rest,L"GET",L"/wsChilkatEcho.ashx"); success = CkWebSocketW_ValidateServerHandshake(ws); if (success != TRUE) { wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkWebSocketW_Dispose(ws); CkRestW_Dispose(rest); return; } // This example demonstrates sending a frame and receiving a text frame. // Send a frame containing the string "Hello World!" // This will be the first and final frame, and therefore this constitutes the entire message. finalFrame = TRUE; success = CkWebSocketW_SendFrame(ws,L"Hello World!",finalFrame); if (success != TRUE) { wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkWebSocketW_Dispose(ws); CkRestW_Dispose(rest); return; } // Read an incoming frame. success = CkWebSocketW_ReadFrame(ws); if (success != TRUE) { wprintf(L"Failed to receive a frame\n"); wprintf(L"ReadFrame fail reason = %d\n",CkWebSocketW_getReadFrameFailReason(ws)); wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkWebSocketW_Dispose(ws); CkRestW_Dispose(rest); return; } // Show the string that was received. receivedStr = CkWebSocketW_getFrameData(ws); wprintf(L"Received: %s\n",receivedStr); // Close the websocket connection. success = CkWebSocketW_SendClose(ws,TRUE,1000,L"Closing this websocket."); if (success != TRUE) { wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkWebSocketW_Dispose(ws); CkRestW_Dispose(rest); return; } // Read the Close response. success = CkWebSocketW_ReadFrame(ws); if (success != TRUE) { wprintf(L"ReadFrame fail reason = %d\n",CkWebSocketW_getReadFrameFailReason(ws)); wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkWebSocketW_Dispose(ws); CkRestW_Dispose(rest); return; } // Should receive the "Close" opcode. wprintf(L"Received opcode: %s\n",CkWebSocketW_frameOpcode(ws)); // Should be the same status code we sent (1000) wprintf(L"Received close status code: %d\n",CkWebSocketW_getCloseStatusCode(ws)); // The server may echo the close reason. If not, this will be empty. wprintf(L"Echoed close reason: %s\n",CkWebSocketW_closeReason(ws)); wprintf(L"Success.\n"); CkWebSocketW_Dispose(ws); CkRestW_Dispose(rest); } |
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