Unicode C

Azure Storage: Download Blob to File

See more Azure Cloud Storage Examples

Sample code to download an Azure blob to a file. Unicode C

#include <C_CkRestW.h>
#include <C_CkAuthAzureStorageW.h>
#include <C_CkStreamW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRestW rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    HCkAuthAzureStorageW azAuth;
    HCkStreamW fileStream;
    int expectedStatus;
    const wchar_t *responseStr;

    success = FALSE;

    //  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.blob.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 call.
    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"Blob");
    //  This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    CkAuthAzureStorageW_putXMsVersion(azAuth,L"2021-08-06");
    success = CkRestW_SetAuthAzureStorage(rest,azAuth);

    //  Note: The application does not need to explicitly set the following
    //  headers: Content-Length, x-ms-date, Authorization.  These headers
    //  are automatically set by Chilkat.

    //  Setup a file stream for the download
    fileStream = CkStreamW_Create();
    CkStreamW_putSinkFile(fileStream,L"C:/temp/qa_output/starfish.jpg");

    //  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);

    //  The Azure blob container is "test", the file is "starfish.jpg"
    responseStr = CkRestW_fullRequestNoBody(rest,L"GET",L"/test/starfish.jpg");
    if (CkRestW_getLastMethodSuccess(rest) != TRUE) {

        //  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);
        CkAuthAzureStorageW_Dispose(azAuth);
        CkStreamW_Dispose(fileStream);
        return;
    }

    wprintf(L"Success.\n");


    CkRestW_Dispose(rest);
    CkAuthAzureStorageW_Dispose(azAuth);
    CkStreamW_Dispose(fileStream);

    }