C++

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. C++

#include <CkRest.h>
#include <CkAuthAzureStorage.h>
#include <CkBinData.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool 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.

    CkRest 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".
    success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect);
    if (success == false) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Provide Azure Cloud credentials for the REST calls.
    CkAuthAzureStorage azAuth;
    azAuth.put_AccessKey("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("chilkat");
    azAuth.put_Scheme("SharedKey");
    azAuth.put_Service("File");
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    azAuth.put_XMsVersion("2021-08-06");
    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")
    CkBinData bdFileContents;
    success = rest.FullRequestNoBodyBd("GET","/pip/wildlife/antarctic/penguins.jpg",bdFileContents);
    if (success == false) {
        std::cout << rest.lastErrorText() << "\r\n";
        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.
        std::cout << "response status code = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "response status text = " << rest.responseStatusText() << "\r\n";
        std::cout << "response header: " << rest.responseHeader() << "\r\n";
        CkStringBuilder sbXmlErr;
        sbXmlErr.AppendBd(bdFileContents,"utf-8",0,0);
        std::cout << "response body (if any): " << sbXmlErr.getAsString() << "\r\n";
        std::cout << "---" << "\r\n";
        std::cout << "LastRequestStartLine: " << rest.lastRequestStartLine() << "\r\n";
        std::cout << "LastRequestHeader: " << rest.lastRequestHeader() << "\r\n";
        return;
    }

    std::cout << "Size of the downloaded file = " << bdFileContents.get_NumBytes() << "\r\n";

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

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