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C# UWP/WinRT Examples

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(C# UWP/WinRT) REST Download Binary to Memory (Byte Array) (Amazon S3)

Demonstrates how to make a REST call that returns a binary response body. This example is valid for reasonably small files that fit in memory. The example shows how to download a small JPG from the Amazon S3 service. For larger files, Chilkat provides streaming functionality to stream directly to a file, or to make an asynchronous call where the foreground thread can read the response body stream.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

Chilkat.Rest rest = new Chilkat.Rest();

//  Connect to the Amazon AWS REST server.
bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
bool success = await rest.ConnectAsync("s3.amazonaws.com",port,bTls,bAutoReconnect);

//  ----------------------------------------------------------------------------
//  Important: For buckets created in regions outside us-east-1,
//  there are three important changes that need to be made.
//  See Working with S3 Buckets in Non-us-east-1 Regions for the details.
//  ----------------------------------------------------------------------------

//  Provide AWS credentials for the REST call.
Chilkat.AuthAws authAws = new Chilkat.AuthAws();
authAws.AccessKey = "AWS_ACCESS_KEY";
authAws.SecretKey = "AWS_SECRET_KEY";
authAws.ServiceName = "s3";
success = rest.SetAuthAws(authAws);

//  Set the bucket name via the HOST header.
//  In this case, the bucket name is "chilkat100".
rest.Host = "chilkat100.s3.amazonaws.com";

//  Send the request to download the JPG.
success = await rest.SendReqNoBodyAsync("GET","/starfish.jpg");
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

//  Read the response header.
int responseStatusCode = await rest.ReadResponseHeaderAsync();
if (responseStatusCode < 0) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Debug.WriteLine("Response status code = " + Convert.ToString(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) {
    byte[] jpgData = await rest.ReadRespBodyBinaryAsync();
    if (rest.LastMethodSuccess != true) {
        Debug.WriteLine(rest.LastErrorText);
    }
    else {
        Debug.WriteLine("Successfully received the JPG bytes..");
    }

}
else {
    string errResponse = await rest.ReadRespBodyStringAsync();
    if (rest.LastMethodSuccess != true) {
        Debug.WriteLine(rest.LastErrorText);
    }
    else {
        Debug.WriteLine(errResponse);
    }

}


 

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