(MFC) Azure Storage: List Blobs

Azure Storage Blob Service REST API: Sample code to fetch the list of blobs in the specified container.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkRest.h>
#include <CkAuthAzureStorage.h>
#include <CkXml.h>
#include <CkDateTime.h>
#include <CkDtObj.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // Azure Blob Service Example: List the blobs in a specified container.
    // See also: https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx

    // 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".
    bool success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Provide Azure Cloud credentials for the REST call.
    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("Blob");
    // This causes the "x-ms-version: 2020-08-04" header to be automatically added.
    azAuth.put_XMsVersion("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.

    // The expected success response is a 200 response status code with an XML response body.
    // In this example, we are listing the blobs in the container named "mycontainer".
    const char *responseStr = rest.fullRequestNoBody("GET","/mycontainer?restype=container&comp=list");
    if (rest.get_LastMethodSuccess() != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // When successful, the Azure Storage service will respond with a 200 response status code,
    // with an XML response body.

    if (rest.get_ResponseStatusCode() != 200) {
        // Examine the request/response to see what happened.
        strOut.append("response status code = ");
        strOut.appendInt(rest.get_ResponseStatusCode());
        strOut.append("\r\n");
        strOut.append("response status text = ");
        strOut.append(rest.responseStatusText());
        strOut.append("\r\n");
        strOut.append("response header: ");
        strOut.append(rest.responseHeader());
        strOut.append("\r\n");
        strOut.append("response body (if any): ");
        strOut.append(responseStr);
        strOut.append("\r\n");
        strOut.append("---");
        strOut.append("\r\n");
        strOut.append("LastRequestStartLine: ");
        strOut.append(rest.lastRequestStartLine());
        strOut.append("\r\n");
        strOut.append("LastRequestHeader: ");
        strOut.append(rest.lastRequestHeader());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Load the XML response for parsing.
    // An example of the response XML is shown below.
    CkXml xml;
    success = xml.LoadXml(responseStr);

    strOut.append(xml.getXml());
    strOut.append("\r\n");

    // Let's iterate over the blobs...

    CkDateTime lastMod;

    int numBlobs = xml.NumChildrenAt("Blobs");
    int i = 0;
    while (i < numBlobs) {
        strOut.append("---- Blob ");
        strOut.appendInt(i);
        strOut.append(" ----");
        strOut.append("\r\n");
        xml.put_I(i);
        strOut.append("Name: ");
        strOut.append(xml.getChildContent("Blobs|Blob[i]|Name"));
        strOut.append("\r\n");
        strOut.append("Content-Length: ");
        strOut.append(xml.getChildContent("Blobs|Blob[i]|Properties|Content-Length"));
        strOut.append("\r\n");
        strOut.append("Content-Type: ");
        strOut.append(xml.getChildContent("Blobs|Blob[i]|Properties|Content-Type"));
        strOut.append("\r\n");
        strOut.append("Content-MD5: ");
        strOut.append(xml.getChildContent("Blobs|Blob[i]|Properties|Content-MD5"));
        strOut.append("\r\n");
        strOut.append("BlobType: ");
        strOut.append(xml.getChildContent("Blobs|Blob[i]|Properties|BlobType"));
        strOut.append("\r\n");
        strOut.append("LeaseStatus: ");
        strOut.append(xml.getChildContent("Blobs|Blob[i]|Properties|LeaseStatus"));
        strOut.append("\r\n");
        lastMod.SetFromRfc822(xml.getChildContent("Blobs|Blob[i]|Properties|Last-Modified"));
        CkDtObj *dt = lastMod.GetDtObj(true);
        strOut.append("Last-Modified YMD: ");
        strOut.appendInt(dt->get_Year());
        strOut.append(",");
        strOut.appendInt(dt->get_Month());
        strOut.append(",");
        strOut.appendInt(dt->get_Day());
        strOut.append("\r\n");
        delete dt;
        i = i + 1;
    }

    strOut.append("-------------------------");
    strOut.append("\r\n");

    // Use the ChilkatPath method to get information for a specific blob:

    // For example, let's say we want the Last-Modified date/time for
    // the blob named "helloWorld.txt"
    const char *lastModStr = xml.chilkatPath("/C/Name,helloWorld.txt|..|Properties|Last-Modified|*");
    strOut.append("helloWorld.txt Last-Modified: ");
    strOut.append(lastModStr);
    strOut.append("\r\n");

    strOut.append("Success.");
    strOut.append("\r\n");

    // <?xml version="1.0" encoding="utf-8" ?>
    // <EnumerationResults ServiceEndpoint="https://chilkat.blob.core.windows.net/" ContainerName="test">
    //     <Blobs>
    //         <Blob>
    //             <Name>hamletC.xml</Name>
    //             <Properties>
    //                 <Last-Modified>Mon, 02 May 2016 23:50:30 GMT</Last-Modified>
    //                 <Etag>0x8D372E48B6D323A</Etag>
    //                 <Content-Length>279658</Content-Length>
    //                 <Content-Type>application/octet-stream</Content-Type>
    //                 <Content-Encoding />
    //                 <Content-Language />
    //                 <Content-MD5>4E6prI9haw81xadSLeEj3Q==</Content-MD5>
    //                 <Cache-Control />
    //                 <Content-Disposition>attachment; filename="hamletC.xml"</Content-Disposition>
    //                 <BlobType>BlockBlob</BlobType>
    //                 <LeaseStatus>unlocked</LeaseStatus>
    //                 <LeaseState>available</LeaseState>
    //             </Properties>
    //         </Blob>
    //         <Blob>
    //             <Name>helloWorld.txt</Name>
    //             <Properties>
    //                 <Last-Modified>Mon, 02 May 2016 15:21:55 GMT</Last-Modified>
    //                 <Etag>0x8D3729D7EE38299</Etag>
    //                 <Content-Length>12</Content-Length>
    //                 <Content-Type>application/octet-stream</Content-Type>
    //                 <Content-Encoding />
    //                 <Content-Language />
    //                 <Content-MD5>7Qdih1MuhjZehB6Sv8UNjA==</Content-MD5>
    //                 <Cache-Control />
    //                 <Content-Disposition>attachment; filename="helloWorld.txt"</Content-Disposition>
    //                 <BlobType>BlockBlob</BlobType>
    //                 <LeaseStatus>unlocked</LeaseStatus>
    //                 <LeaseState>available</LeaseState>
    //             </Properties>
    //         </Blob>
    //         <Blob>
    //             <Name>thisIsATest.txt</Name>
    //             <Properties>
    //                 <Last-Modified>Tue, 03 May 2016 00:22:13 GMT</Last-Modified>
    //                 <Etag>0x8D372E8F9B2A62E</Etag>
    //                 <Content-Length>1600</Content-Length>
    //                 <Content-Type>application/octet-stream</Content-Type>
    //                 <Content-Encoding />
    //                 <Content-Language />
    //                 <Content-MD5>FhgUXYfePg2ItsraPmz0Xg==</Content-MD5>
    //                 <Cache-Control />
    //                 <Content-Disposition>attachment; filename="thisIsATest.txt"</Content-Disposition>
    //                 <BlobType>BlockBlob</BlobType>
    //                 <LeaseStatus>unlocked</LeaseStatus>
    //                 <LeaseState>available</LeaseState>
    //             </Properties>
    //         </Blob>
    //     </Blobs>
    //     <NextMarker />
    // </EnumerationResults>
    // 


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }