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(Unicode C) WebSocket ConnectDemonstrates how to establish a WebSocket connection. Once the connection is established, messages may be sent back-and-forth. Messages are sent in frames, where the last frame in the message is indicated by a "final" bit. A frame constitutes the entire message if the first frame sent has the "final" bit sent. (In most cases, you'll probably be sending single-frame messages.)
#include <C_CkRestW.h> #include <C_CkWebSocketW.h> void ChilkatSample(void) { HCkRestW rest; BOOL success; HCkWebSocketW ws; const wchar_t *responseBody; int statusCode; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // -------------------------------------------------- // A WebSocket connection begins life as an HTTP GET request containing a few special header fields, // such as "Upgrade: websocket". // Your application will use the Chilkat Rest class to send the initial HTTP GET. This allows you // to use the full capability of the Chilkat Rest class to customize the GET for any particular situation. // For example: // // - If custom HTTP request header fields must be added. // - If authentication is required, such as OAuth2, OAuth1, Basic HTTP Auth, etc. // - If HTTPS, SSH Tunneling, Proxies (HTTP or SOCKS), or other advanced connection or TLS features are required. // rest = CkRestW_Create(); success = CkRestW_Connect(rest,L"someserver.com",80,FALSE,FALSE); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); return; } ws = CkWebSocketW_Create(); // Tell the WebSocket to use this connection. success = CkWebSocketW_UseConnection(ws,rest); if (success != TRUE) { wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkRestW_Dispose(rest); CkWebSocketW_Dispose(ws); return; } // Add the standard WebSocket open handshake headers that will be needed. // (This adds the required HTTP request headers to the rest object.) CkWebSocketW_AddClientHeaders(ws); // Add any additional headers that might be desired. // Two common WebSocketSpecific headers are "Sec-WebSocket-Protocol" and "Origin". CkRestW_AddHeader(rest,L"Sec-WebSocket-Protocol",L"x-something"); CkRestW_AddHeader(rest,L"Origin",L"http://someserver.com"); // Do the open handshake. responseBody = CkRestW_fullRequestNoBody(rest,L"GET",L"/something"); if (CkRestW_getLastMethodSuccess(rest) != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkWebSocketW_Dispose(ws); return; } // If successful, the HTTP response status code should be 101, // and the response body will be empty. (If it failed, we'll have a look // at the response body..) statusCode = CkRestW_getResponseStatusCode(rest); wprintf(L"Response status code: %d\n",statusCode); if (statusCode != 101) { wprintf(L"%s\n",responseBody); wprintf(L"-- Failed because of unexpected response status code.\n"); CkRestW_Dispose(rest); CkWebSocketW_Dispose(ws); return; } // We have the expected 101 response, so let's now validate the // contents of the response, such as the value sent by the server in the // Sec-WebSocket-Accept header. success = CkWebSocketW_ValidateServerHandshake(ws); if (success != TRUE) { wprintf(L"%s\n",CkWebSocketW_lastErrorText(ws)); CkRestW_Dispose(rest); CkWebSocketW_Dispose(ws); return; } wprintf(L"WebSocket connection successful.\n"); // The application may now begin sending and receiving frames on the WebSocket connection. // (At this point, we're done with the rest object...) CkRestW_Dispose(rest); CkWebSocketW_Dispose(ws); } |
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