(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 <C_CkRestW.h>
#include <C_CkAuthAwsW.h>
#include <C_CkStreamW.h>

void ChilkatSample(void)
    {
    HCkRestW rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    BOOL success;
    HCkAuthAwsW authAws;
    int responseStatusCode;
    HCkStreamW bodyStream;
    const wchar_t *errResponse;

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

    rest = CkRestW_Create();

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

    // Provide AWS credentials for the REST call.
    authAws = CkAuthAwsW_Create();
    CkAuthAwsW_putAccessKey(authAws,L"AWS_ACCESS_KEY");
    CkAuthAwsW_putSecretKey(authAws,L"AWS_SECRET_KEY");
    CkAuthAwsW_putServiceName(authAws,L"s3");

    // For AWS Signature Version 2, the following two properties need to be set:
    CkAuthAwsW_putSignatureVersion(authAws,2);
    // See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
    CkAuthAwsW_putCanonicalizedResourceV2(authAws,L"/chilkat100/starfish.jpg");

    success = CkRestW_SetAuthAws(rest,authAws);

    // Send the request to download the JPG.
    success = CkRestW_SendReqNoBody(rest,L"GET",L"/starfish.jpg");
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkAuthAwsW_Dispose(authAws);
        return;
    }

    // Read the response header.
    responseStatusCode = CkRestW_ReadResponseHeader(rest);
    if (responseStatusCode < 0) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkAuthAwsW_Dispose(authAws);
        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) {

        bodyStream = CkStreamW_Create();

        // The stream's sink will be a file.
        CkStreamW_putSinkFile(bodyStream,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 = CkRestW_ReadRespBodyStream(rest,bodyStream,TRUE);
        if (success != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
            CkRestW_Dispose(rest);
            CkAuthAwsW_Dispose(authAws);
            CkStreamW_Dispose(bodyStream);
            return;
        }

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

    }
    else {
        errResponse = CkRestW_readRespBodyString(rest);
        if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        }
        else {
            wprintf(L"%s\n",errResponse);
        }

    }



    CkRestW_Dispose(rest);
    CkAuthAwsW_Dispose(authAws);
    CkStreamW_Dispose(bodyStream);

    }