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(Unicode C) Download File from Dropbox (Streaming)See more Dropbox ExamplesDownloads a file from Dropbox, streaming it directly to a file in the filesystem.
#include <C_CkRestW.h> #include <C_CkJsonObjectW.h> #include <C_CkStreamW.h> #include <C_CkDateTimeW.h> #include <C_CkDtObjW.h> void ChilkatSample(void) { HCkRestW rest; BOOL success; HCkJsonObjectW json; HCkStreamW fileStream; int expectedStatus; const wchar_t *responseStr; const wchar_t *apiResult; HCkJsonObjectW jsonResult; int size; const wchar_t *rev; const wchar_t *clientModified; HCkDateTimeW ckdt; BOOL bLocalTime; HCkDtObjW dt; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // A Dropbox access token should have been previously obtained. // Dropbox access tokens do not expire. // See Dropbox Access Token. rest = CkRestW_Create(); // Connect to Dropbox success = CkRestW_Connect(rest,L"content.dropboxapi.com",443,TRUE,TRUE); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); return; } // Add request headers. CkRestW_AddHeader(rest,L"Authorization",L"Bearer DROPBOX_ACCESS_TOKEN"); // The download "parameters" are contained in JSON passed in an HTTP request header. // This is the JSON indicating the file to be downloaded: // { // "path": "/Homework/lit/hamlet.xml", // } json = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(json,L"path",L"/Homework/lit/hamlet.xml"); CkRestW_AddHeader(rest,L"Dropbox-API-Arg",CkJsonObjectW_emit(json)); // Setup a file stream for the download fileStream = CkStreamW_Create(); CkStreamW_putSinkFile(fileStream,L"qa_output/hamletFromDropbox.xml"); // Indicate that the call to FullRequestNoBody should send the response body // to fileStream if the response status code is 200. // If a non-success response status code is received, then nothing // is streamed to the output file and the error response is returned by FullRequestNoBody. expectedStatus = 200; CkRestW_SetResponseBodyStream(rest,expectedStatus,TRUE,fileStream); responseStr = CkRestW_fullRequestNoBody(rest,L"POST",L"/2/files/download"); if (CkRestW_getLastMethodSuccess(rest) != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(json); CkStreamW_Dispose(fileStream); return; } // When successful, Dropbox responds with a 200 response code. if (CkRestW_getResponseStatusCode(rest) != 200) { // Examine the request/response to see what happened. wprintf(L"response status code = %d\n",CkRestW_getResponseStatusCode(rest)); wprintf(L"response status text = %s\n",CkRestW_responseStatusText(rest)); wprintf(L"response header: %s\n",CkRestW_responseHeader(rest)); wprintf(L"response body (if any): %s\n",responseStr); wprintf(L"---\n"); wprintf(L"LastRequestStartLine: %s\n",CkRestW_lastRequestStartLine(rest)); wprintf(L"LastRequestHeader: %s\n",CkRestW_lastRequestHeader(rest)); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(json); CkStreamW_Dispose(fileStream); return; } // Information about the downloaded file is also available as JSON in a response header. // The "dropbox-api-result" response header contains the information. For example: apiResult = CkRestW_responseHdrByName(rest,L"dropbox-api-result"); wprintf(L"%s\n",apiResult); // In this case, the pretty-formatted dropbox-api-result JSON looks like this: // { // "name": "hamlet.xml", // "path_lower": "/homework/lit/hamlet.xml", // "path_display": "/Homework/lit/hamlet.xml", // "id": "id:74FkdeNuyKAAAAAAAAAAAQ", // "client_modified": "2016-06-02T23:19:00Z", // "server_modified": "2016-06-02T23:19:00Z", // "rev": "9482db15f", // "size": 279658 // } // Load the JSON, pretty-print it, and demonstrate how to get some values... jsonResult = CkJsonObjectW_Create(); CkJsonObjectW_putEmitCompact(jsonResult,FALSE); CkJsonObjectW_Load(jsonResult,apiResult); // Show the JSON pretty-printed... wprintf(L"%s\n",CkJsonObjectW_emit(jsonResult)); // Sample code to get data from the JSON response: size = CkJsonObjectW_IntOf(jsonResult,L"size"); wprintf(L"size = %d\n",size); rev = CkJsonObjectW_stringOf(jsonResult,L"rev"); wprintf(L"rev = %s\n",rev); clientModified = CkJsonObjectW_stringOf(jsonResult,L"client_modified"); ckdt = CkDateTimeW_Create(); CkDateTimeW_SetFromTimestamp(ckdt,clientModified); bLocalTime = TRUE; dt = CkDateTimeW_GetDtObj(ckdt,bLocalTime); wprintf(L"%d/%d/%d %d:%d\n",CkDtObjW_getDay(dt),CkDtObjW_getMonth(dt),CkDtObjW_getYear(dt),CkDtObjW_getHour(dt),CkDtObjW_getMinute(dt)); CkDtObjW_Dispose(dt); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(json); CkStreamW_Dispose(fileStream); CkJsonObjectW_Dispose(jsonResult); CkDateTimeW_Dispose(ckdt); } |
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