(Unicode C++) Download a Binary File into Memory

Downloads a binary file into memory.

Chilkat C/C++ Library Downloads
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#include <CkRestW.h>
#include <CkAuthAzureStorageW.h>
#include <CkBinDataW.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    // 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.

    CkRestW rest;

    // Connect to the Azure Storage Blob Service
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    // In this example, the storage account name is "chilkat".
    bool success = rest.Connect(L"chilkat.file.core.windows.net",port,bTls,bAutoReconnect);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // Provide Azure Cloud credentials for the REST calls.
    CkAuthAzureStorageW azAuth;
    azAuth.put_AccessKey(L"AZURE_ACCESS_KEY");
    // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    azAuth.put_Account(L"chilkat");
    azAuth.put_Scheme(L"SharedKey");
    azAuth.put_Service(L"File");
    // This causes the "x-ms-version: 2020-08-04" header to be automatically added.
    azAuth.put_XMsVersion(L"2020-08-04");
    success = rest.SetAuthAzureStorage(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")
    CkBinDataW bdFileContents;
    success = rest.FullRequestNoBodyBd(L"GET",L"/pip/wildlife/antarctic/penguins.jpg",bdFileContents);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        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 (rest.get_ResponseStatusCode() != 200) {
        // Examine the request/response to see what happened.
        wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode());
        wprintf(L"response status text = %s\n",rest.responseStatusText());
        wprintf(L"response header: %s\n",rest.responseHeader());
        CkStringBuilderW sbXmlErr;
        sbXmlErr.AppendBd(bdFileContents,L"utf-8",0,0);
        wprintf(L"response body (if any): %s\n",sbXmlErr.getAsString());
        wprintf(L"---\n");
        wprintf(L"LastRequestStartLine: %s\n",rest.lastRequestStartLine());
        wprintf(L"LastRequestHeader: %s\n",rest.lastRequestHeader());
        return;
    }

    wprintf(L"Size of the downloaded file = %d\n",bdFileContents.get_NumBytes());

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

    bdFileContents.WriteFile(L"qa_output/penguins.jpg");
    }