C#

REST Asynchronous Streaming Upload File

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Demonstrates how to asynchronous streaming upload a file to cloud storage. This particular example demonstrates an upload to the Azure Cloud Storage service. The same concepts apply to S3, Google Cloud, and Google Drive. C#

bool success = false;

// 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 Azure Storage Blob Service
bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
// In this example, the storage account name is "chilkat".
success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// Provide Azure Cloud credentials for the REST call.
Chilkat.AuthAzureStorage azAuth = new Chilkat.AuthAzureStorage();
azAuth.AccessKey = "AZURE_ACCESS_KEY";
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account = "chilkat";
azAuth.Scheme = "SharedKey";
azAuth.Service = "Blob";
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = "2021-08-06";
success = rest.SetAuthAzureStorage(azAuth);

// Set some request headers.
success = rest.AddHeader("x-ms-blob-content-disposition","attachment; filename=\"thisIsATest.txt\"");
success = rest.AddHeader("x-ms-blob-type","BlockBlob");
success = rest.AddHeader("x-ms-meta-m1","v1");
success = rest.AddHeader("x-ms-meta-m2","v2");

// Note: The application does not need to explicitly set the following
// headers: x-ms-date, Authorization, and Content-Length.  These headers
// are automatically set by Chilkat.

Chilkat.Stream sendStream = new Chilkat.Stream();

// Define the source data for the stream to be a file.
sendStream.SourceFile = "qa_data/hamlet.xml";

// Create a background thread task to upload from the stream
// The name of the Azure storage container is "test".
Chilkat.Task task = rest.FullRequestStreamAsync("PUT","/test/thisIsATest.txt",sendStream);

// Start the task. 
success = task.Run();

// In this example, we'll simply sleep and periodically
// check to see if the REST upload if finished.
int curPctDone = 0;
while (task.Finished != true) {
    task.SleepMs(100);
}

// Check to see if the call to FullRequestStream in the background thread pool succeeded.
if (task.TaskSuccess != true) {
    // Show what would've been the LastErrorText had FullRequestStream been called synchronously
    Debug.WriteLine(task.ResultErrorText);

    return;
}

int responseStatusCode = rest.ResponseStatusCode;

// When successful, the Azure Storage service will respond with a 201 response code,
// with an empty body.  Therefore, in the success condition, the responseStr is empty.
if (responseStatusCode == 201) {
    Debug.WriteLine("File uploaded.");
}
else {
    // It failed, so examine the response body, if one was returned:
    // Given that FullRequestStream returns a string, the return value is obtained via GetResultString.
    string responseBodyStr = task.GetResultString();
    Debug.WriteLine("response body (if any): " + responseBodyStr);

    // Examine the request/response to see what happened.
    Debug.WriteLine("response status code = " + Convert.ToString(rest.ResponseStatusCode));
    Debug.WriteLine("response status text = " + rest.ResponseStatusText);
    Debug.WriteLine("response header: " + rest.ResponseHeader);
    Debug.WriteLine("---");
    Debug.WriteLine("LastRequestStartLine: " + rest.LastRequestStartLine);
    Debug.WriteLine("LastRequestHeader: " + rest.LastRequestHeader);
}