C

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.

C

#include <C_CkHttp.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    const char *bucketName;
    const char *strXml;
    HCkXml xml;
    const char *ETag;
    const char *Key;
    const char *LastModified;
    const char *ID;
    const char *SizeDecimalStr;
    const char *StorageClass;
    const char *ListBucketResult_xmlns;
    int i;
    int count_i;
    const char *IsTruncated;
    int MaxKeys;
    const char *Name;

    success = FALSE;

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

    http = CkHttp_Create();

    // keyID = Access Key ID or Access Key
    CkHttp_putAwsAccessKey(http,"access-key");

    // applicationKey = Secret Access Key or Secret Key
    CkHttp_putAwsSecretKey(http,"secret-key");

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

    bucketName = "chilkat-test";

    strXml = CkHttp_s3_ListBucketObjects(http,bucketName);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        return;
    }

    printf("Response status code = %d\n",CkHttp_getLastStatus(http));

    xml = CkXml_Create();
    success = CkXml_LoadXml(xml,strXml);
    if (success != TRUE) {
        printf("%s\n",CkXml_lastErrorText(xml));
        CkHttp_Dispose(http);
        CkXml_Dispose(xml);
        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 (CkHttp_getLastStatus(http) != 200) {
        printf("%s\n",CkXml_getXml(xml));
        printf("Failed.\n");
        CkHttp_Dispose(http);
        CkXml_Dispose(xml);
        return;
    }

    // A sample response is shown below.
    printf("%s\n",CkXml_getXml(xml));
    printf("----\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>

    ListBucketResult_xmlns = CkXml_getAttrValue(xml,"xmlns");
    i = 0;
    count_i = CkXml_NumChildrenHavingTag(xml,"Contents");
    while (i < count_i) {
        CkXml_putI(xml,i);
        ETag = CkXml_getChildContent(xml,"Contents[i]|ETag");
        Key = CkXml_getChildContent(xml,"Contents[i]|Key");
        LastModified = CkXml_getChildContent(xml,"Contents[i]|LastModified");
        ID = CkXml_getChildContent(xml,"Contents[i]|Owner|ID");
        SizeDecimalStr = CkXml_getChildContent(xml,"Contents[i]|Size");
        StorageClass = CkXml_getChildContent(xml,"Contents[i]|StorageClass");
        i = i + 1;
    }

    IsTruncated = CkXml_getChildContent(xml,"IsTruncated");
    MaxKeys = CkXml_GetChildIntValue(xml,"MaxKeys");
    Name = CkXml_getChildContent(xml,"Name");


    CkHttp_Dispose(http);
    CkXml_Dispose(xml);

    }