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(Unicode C) HTTP Download to StreamDemonstrates how to stream the response body directly to a stream, which in this case is to a file stream.
#include <C_CkRestW.h> #include <C_CkUrlW.h> #include <C_CkStreamW.h> void ChilkatSample(void) { HCkRestW rest; HCkUrlW url; BOOL bAutoReconnect; BOOL success; int responseStatusCode; HCkStreamW bodyStream; const wchar_t *errResponse; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest = CkRestW_Create(); // The URL we want to download is: // https://github.com/chilkatsoft/OAuth2-CSharp-Desktop/archive/master.zip url = CkUrlW_Create(); CkUrlW_ParseUrl(url,L"https://github.com/chilkatsoft/OAuth2-CSharp-Desktop/archive/master.zip"); // Connect to the web server bAutoReconnect = TRUE; success = CkRestW_Connect(rest,CkUrlW_host(url),CkUrlW_getPort(url),CkUrlW_getSsl(url),bAutoReconnect); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkUrlW_Dispose(url); return; } success = CkRestW_SendReqNoBody(rest,L"GET",CkUrlW_path(url)); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkUrlW_Dispose(url); return; } // Read the response header. responseStatusCode = CkRestW_ReadResponseHeader(rest); if (responseStatusCode < 0) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkUrlW_Dispose(url); return; } wprintf(L"Response status code = %d\n",responseStatusCode); // We expect a 200 response status if the file data is coming. // Otherwise, we'll get a string response body with an error message(or no response body). if (responseStatusCode == 200) { bodyStream = CkStreamW_Create(); // The stream's sink will be a file. CkStreamW_putSinkFile(bodyStream,L"qa_output/OAuth2-CSharp-Desktop/archive/master.zip"); // Read the response body to the stream. Given that we've // set the stream's sink to a file, it will stream directly // to the file. success = CkRestW_ReadRespBodyStream(rest,bodyStream,TRUE); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkUrlW_Dispose(url); CkStreamW_Dispose(bodyStream); return; } wprintf(L"Successfully downloaded the file.\n"); } else { errResponse = CkRestW_readRespBodyString(rest); if (CkRestW_getLastMethodSuccess(rest) != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); } else { wprintf(L"%s\n",errResponse); } } CkRestW_Dispose(rest); CkUrlW_Dispose(url); CkStreamW_Dispose(bodyStream); } |
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