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Unicode C++ Examples

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(Unicode C++) (using AWS Signature Version 2) Streaming Download to File

The main purpose of this example is to demonstrate how to use the older Signature Version 2 authentication w/ S3. It uses V2 authentication to download a file.

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#include <CkRestW.h>
#include <CkAuthAwsW.h>
#include <CkStreamW.h>

void ChilkatSample(void)
    {
    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkRestW rest;

    //  Connect to the Amazon AWS REST server.
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    //  The file is located in the bucket named "chilkat100", which becomes part of the domain:
    bool success = rest.Connect(L"chilkat100.s3.amazonaws.com",port,bTls,bAutoReconnect);

    //  Provide AWS credentials for the REST call.
    CkAuthAwsW authAws;
    authAws.put_AccessKey(L"AWS_ACCESS_KEY");
    authAws.put_SecretKey(L"AWS_SECRET_KEY");
    authAws.put_ServiceName(L"s3");

    //  For AWS Signature Version 2, the following two properties need to be set:
    authAws.put_SignatureVersion(2);
    //  See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
    authAws.put_CanonicalizedResourceV2(L"/chilkat100/starfish.jpg");

    success = rest.SetAuthAws(authAws);

    //  Send the request to download the JPG.
    success = rest.SendReqNoBody(L"GET",L"/starfish.jpg");
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    //  Read the response header.
    int responseStatusCode = rest.ReadResponseHeader();
    if (responseStatusCode < 0) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    wprintf(L"Response status code = %d\n",responseStatusCode);

    //  We expect a 200 response status if the JPG data is coming.
    //  Otherwise, we'll get a string response body with an error message(or no response body).
    if (responseStatusCode == 200) {

        CkStreamW bodyStream;

        //  The stream's sink will be a file.
        bodyStream.put_SinkFile(L"qa_output/starfish.jpg");

        //  Read the response body to the stream.  Given that we've
        //  set the stream's sink to a file, it will stream directly
        //  to the file.
        success = rest.ReadRespBodyStream(bodyStream,true);
        if (success != true) {
            wprintf(L"%s\n",rest.lastErrorText());
            return;
        }

        wprintf(L"Successfully received the JPG file.\n");

    }
    else {
        const wchar_t *errResponse = rest.readRespBodyString();
        if (rest.get_LastMethodSuccess() != true) {
            wprintf(L"%s\n",rest.lastErrorText());
        }
        else {
            wprintf(L"%s\n",errResponse);
        }

    }


    }

 

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