(MFC) Backblaze S3 List Bucket Objects

See more Backblaze S3 Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with the Backblaze service. However, because of some specific issues, Chilkat v9.5.0.89 or later is needed.

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

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkXml.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat HTTP API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http;

    // keyID = Access Key ID or Access Key
    http.put_AwsAccessKey("access-key");

    // applicationKey = Secret Access Key or Secret Key
    http.put_AwsSecretKey("secret-key");

    // Region is the 2nd part of your S3 Endpoint
    http.put_AwsEndpoint("s3.us-west-002.backblazeb2.com");

    const char *bucketName = "chilkat-test";

    const char *strXml = http.s3_ListBucketObjects(bucketName);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Response status code = ");
    strOut.appendInt(http.get_LastStatus());
    strOut.append("\r\n");

    CkXml xml;
    bool success = xml.LoadXml(strXml);
    if (success != true) {
        strOut.append(xml.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // If the response status code was not 200, then the XML response is not a 
    // listing of objects, but instead contains error information.
    if (http.get_LastStatus() != 200) {
        strOut.append(xml.getXml());
        strOut.append("\r\n");
        strOut.append("Failed.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // A sample response is shown below.
    strOut.append(xml.getXml());
    strOut.append("\r\n");
    strOut.append("----");
    strOut.append("\r\n");

    // Use this online tool to generate parsing code from sample XML: 
    // Generate Parsing Code from XML

    // <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Contents>
    //         <ETag>"303fb46cf341094fef6274b7789cd6aa"</ETag>
    //         <Key>orchard.json</Key>
    //         <LastModified>2021-10-30T14:45:52.000Z</LastModified>
    //         <Owner>
    //             <ID>f2ebbc5f792c</ID>
    //             <DisplayName/>
    //         </Owner>
    //         <Size>22</Size>
    //         <StorageClass>STANDARD</StorageClass>
    //     </Contents>
    //     <Contents>
    //         <ETag>"a8551f0a5437f43a796fca7623ee9232"</ETag>
    //         <Key>seahorse.jpg</Key>
    //         <LastModified>2021-10-30T14:38:53.000Z</LastModified>
    //         <Owner>
    //             <ID>f2ebbc5f792c</ID>
    //             <DisplayName/>
    //         </Owner>
    //         <Size>24388</Size>
    //         <StorageClass>STANDARD</StorageClass>
    //     </Contents>
    //     <IsTruncated>false</IsTruncated>
    //     <MaxKeys>1000</MaxKeys>
    //     <Name>chilkat-test</Name>
    //     <Prefix/>
    //     <Marker/>
    // </ListBucketResult>

    const char *ETag = 0;
    const char *Key = 0;
    const char *LastModified = 0;
    const char *ID = 0;
    int Size;
    const char *StorageClass = 0;

    const char *ListBucketResult_xmlns = xml.getAttrValue("xmlns");
    int i = 0;
    int count_i = xml.NumChildrenHavingTag("Contents");
    while (i < count_i) {
        xml.put_I(i);
        ETag = xml.getChildContent("Contents[i]|ETag");
        Key = xml.getChildContent("Contents[i]|Key");
        LastModified = xml.getChildContent("Contents[i]|LastModified");
        ID = xml.getChildContent("Contents[i]|Owner|ID");
        Size = xml.GetChildIntValue("Contents[i]|Size");
        StorageClass = xml.getChildContent("Contents[i]|StorageClass");
        i = i + 1;
    }

    const char *IsTruncated = xml.getChildContent("IsTruncated");
    int MaxKeys = xml.GetChildIntValue("MaxKeys");
    const char *Name = xml.getChildContent("Name");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }