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(C) OneDrive -- Streaming REST Download to FileDownloads the contents of a DriveItem directly to a file in the local filesystem using the Chilkat REST class. Note: This example requires Chilkat v9.5.0.69 or greater.
#include <C_CkRest.h> #include <C_CkOAuth2.h> #include <C_CkBinData.h> #include <C_CkUrl.h> #include <C_CkStringBuilder.h> #include <C_CkJsonObject.h> #include <C_CkStream.h> void ChilkatSample(void) { HCkRest rest; BOOL success; HCkOAuth2 oauth2; const char *uriPath; int statusCode; HCkBinData discard; HCkUrl redirectUrl; HCkStringBuilder sbJson; HCkJsonObject jsonErr; const char *localPath; HCkStream stream; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest = CkRest_Create(); // Use your previously obtained access token here: // See the following examples for getting an access token: // Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint). // Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint). // Refresh Access Token (Azure AD v2.0 Endpoint). // Refresh Access Token (Azure AD Endpoint). // First connect to graph.microsoft.com. If there's a connectivity problem, we'll find out here. success = CkRest_Connect(rest,"graph.microsoft.com",443,TRUE,TRUE); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); return; } // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) oauth2 = CkOAuth2_Create(); CkOAuth2_putAccessToken(oauth2,"MICROSOFT_GRAPH_ACCESS_TOKEN"); CkRest_SetAuthOAuth2(rest,oauth2); // Send the GET request to download the file. uriPath = "/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content"; success = CkRest_SendReqNoBody(rest,"GET",uriPath); if (CkRest_getLastMethodSuccess(rest) != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); return; } // NOTE: This way of doing the HTTP GET (i.e. download) may be more cumbersome, but it // allows for finer control of handling errors. The connection establishment, the sending of the // request, the reading of the response header, and the reading of the response body (i.e. the file data) // are handled by separate method calls. If the response header indicates an error, we can read // the response body and treat it differently than if reading the file data. // Read the response header. statusCode = CkRest_ReadResponseHeader(rest); printf("Response Status Code = %d\n",statusCode); if (statusCode == 302) { // This is a redirect. Read the response body, if any, and then follow the redirect. // Usually the response body will be empty for a redirect, but we need to be sure to read // the response body just in case it exists. discard = CkBinData_Create(); CkRest_ReadRespBd(rest,discard); CkRest_Disconnect(rest,10); // For OneDrive, the redirect URL does not need authorization because the only way // to have obtained the direct download URL is from an authenticated request. // In fact, if we leave the authentication present, the GET request to the redirect URL will fail. // Note: The ClearAuth method is introduced in v9.5.0.69. CkRest_ClearAuth(rest); // Follow the redirect URL... redirectUrl = CkRest_RedirectUrl(rest); printf("Redirect Host: %s\n",CkUrl_host(redirectUrl)); printf("Redirect URI Path: %s\n",CkUrl_pathWithQueryParams(redirectUrl)); success = CkRest_Connect(rest,CkUrl_host(redirectUrl),CkUrl_getPort(redirectUrl),CkUrl_getSsl(redirectUrl),TRUE); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); return; } // Send the request.. success = CkRest_SendReqNoBody(rest,"GET",CkUrl_path(redirectUrl)); CkUrl_Dispose(redirectUrl); if (CkRest_getLastMethodSuccess(rest) != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); return; } statusCode = CkRest_ReadResponseHeader(rest); printf("%s\n",CkRest_lastErrorText(rest)); printf("Redirect Response Status Code = %d\n",statusCode); } if (statusCode >= 300) { // Read the error response body. sbJson = CkStringBuilder_Create(); success = CkRest_ReadRespSb(rest,sbJson); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); CkStringBuilder_Dispose(sbJson); return; } jsonErr = CkJsonObject_Create(); CkJsonObject_putEmitCompact(jsonErr,FALSE); CkJsonObject_LoadSb(jsonErr,sbJson); printf("%s\n",CkJsonObject_emit(jsonErr)); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); CkStringBuilder_Dispose(sbJson); CkJsonObject_Dispose(jsonErr); return; } // Stream the response body directly to a local file. localPath = "qa_output/penguins.jpg"; stream = CkStream_Create(); CkStream_putSinkFile(stream,localPath); success = CkRest_ReadRespBodyStream(rest,stream,TRUE); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); CkStringBuilder_Dispose(sbJson); CkJsonObject_Dispose(jsonErr); CkStream_Dispose(stream); return; } printf("Successfully streamed a OneDrive file to the local filesystem.\n"); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); CkStringBuilder_Dispose(sbJson); CkJsonObject_Dispose(jsonErr); CkStream_Dispose(stream); } |
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