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(Unicode C) Streaming Download Large File to the Local FilesystemDownloads a large file in a streaming fashion to the local filesystem.
#include <C_CkRestW.h> #include <C_CkAuthAzureStorageW.h> #include <C_CkStreamW.h> void ChilkatSample(void) { HCkRestW rest; BOOL bTls; int port; BOOL bAutoReconnect; BOOL success; HCkAuthAzureStorageW azAuth; int responseStatusCode; HCkStreamW bodyStream; const wchar_t *errResponse; // Azure File Service Example: Downloads a large file to the local filesystem using a Chilkat stream. // See: https://docs.microsoft.com/en-us/rest/api/storageservices/get-file // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest = CkRestW_Create(); // Connect to the Azure Storage Blob Service bTls = TRUE; port = 443; bAutoReconnect = TRUE; // In this example, the storage account name is "chilkat". success = CkRestW_Connect(rest,L"chilkat.file.core.windows.net",port,bTls,bAutoReconnect); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); return; } // Provide Azure Cloud credentials for the REST calls. azAuth = CkAuthAzureStorageW_Create(); CkAuthAzureStorageW_putAccessKey(azAuth,L"AZURE_ACCESS_KEY"); // The account name used here should match the 1st part of the domain passed in the call to Connect (above). CkAuthAzureStorageW_putAccount(azAuth,L"chilkat"); CkAuthAzureStorageW_putScheme(azAuth,L"SharedKey"); CkAuthAzureStorageW_putService(azAuth,L"File"); // This causes the "x-ms-version: 2020-08-04" header to be automatically added. CkAuthAzureStorageW_putXMsVersion(azAuth,L"2020-08-04"); success = CkRestW_SetAuthAzureStorage(rest,azAuth); // Note: The application does not need to explicitly set the following // headers: x-ms-date, Authorization. These headers // are automatically set by Chilkat. // When streaming a download to the local filesystem or directed elsewhere, // the complete HTTP GET operation must be broken into parts. // For example, an HTTP GET consists of sending the request, followed by reading the response header, // and then finally the response body. We'll want to read the response header, and then based // on the information received (such as success or failure), either read the response body // as an error message, or as the file data. // Send the HTTP GET request to download the file. // The share is named "pip". success = CkRestW_SendReqNoBody(rest,L"GET",L"/pip/somethingBig.zip"); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkAuthAzureStorageW_Dispose(azAuth); return; } // Read the response header. responseStatusCode = CkRestW_ReadResponseHeader(rest); if (responseStatusCode < 0) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkAuthAzureStorageW_Dispose(azAuth); 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/somethingBig.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); CkAuthAzureStorageW_Dispose(azAuth); CkStreamW_Dispose(bodyStream); return; } wprintf(L"Successfully received the large 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); CkAuthAzureStorageW_Dispose(azAuth); CkStreamW_Dispose(bodyStream); } |
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