C

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. C

#include <C_CkRest.h>
#include <C_CkAuthAzureStorage.h>
#include <C_CkBinData.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRest rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    HCkAuthAzureStorage azAuth;
    HCkBinData bdFileContents;
    HCkStringBuilder sbXmlErr;

    success = FALSE;

    // Azure File Service Example: Download a Binary File to Memory
    // 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 = CkRest_Create();

    // Connect to the Azure Storage Blob Service
    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    // In this example, the storage account name is "chilkat".
    success = CkRest_Connect(rest,"chilkat.file.core.windows.net",port,bTls,bAutoReconnect);
    if (success == FALSE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    // Provide Azure Cloud credentials for the REST calls.
    azAuth = CkAuthAzureStorage_Create();
    CkAuthAzureStorage_putAccessKey(azAuth,"AZURE_ACCESS_KEY");
    // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    CkAuthAzureStorage_putAccount(azAuth,"chilkat");
    CkAuthAzureStorage_putScheme(azAuth,"SharedKey");
    CkAuthAzureStorage_putService(azAuth,"File");
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    CkAuthAzureStorage_putXMsVersion(azAuth,"2021-08-06");
    success = CkRest_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.

    // Send a GET request to download the file "penguins.jpg" to a BinData object.
    // (The share name is "pip")
    bdFileContents = CkBinData_Create();
    success = CkRest_FullRequestNoBodyBd(rest,"GET","/pip/wildlife/antarctic/penguins.jpg",bdFileContents);
    if (success == FALSE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkAuthAzureStorage_Dispose(azAuth);
        CkBinData_Dispose(bdFileContents);
        return;
    }

    // When successful, the response status will be 200.
    // If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
    if (CkRest_getResponseStatusCode(rest) != 200) {
        // Examine the request/response to see what happened.
        printf("response status code = %d\n",CkRest_getResponseStatusCode(rest));
        printf("response status text = %s\n",CkRest_responseStatusText(rest));
        printf("response header: %s\n",CkRest_responseHeader(rest));
        sbXmlErr = CkStringBuilder_Create();
        CkStringBuilder_AppendBd(sbXmlErr,bdFileContents,"utf-8",0,0);
        printf("response body (if any): %s\n",CkStringBuilder_getAsString(sbXmlErr));
        printf("---\n");
        printf("LastRequestStartLine: %s\n",CkRest_lastRequestStartLine(rest));
        printf("LastRequestHeader: %s\n",CkRest_lastRequestHeader(rest));
        CkRest_Dispose(rest);
        CkAuthAzureStorage_Dispose(azAuth);
        CkBinData_Dispose(bdFileContents);
        CkStringBuilder_Dispose(sbXmlErr);
        return;
    }

    printf("Size of the downloaded file = %d\n",CkBinData_getNumBytes(bdFileContents));

    // See the online reference documentation for the BinData class for ways
    // to access the bytes.

    CkBinData_WriteFile(bdFileContents,"qa_output/penguins.jpg");


    CkRest_Dispose(rest);
    CkAuthAzureStorage_Dispose(azAuth);
    CkBinData_Dispose(bdFileContents);
    CkStringBuilder_Dispose(sbXmlErr);

    }