vendredi 24 janvier 2014

Windows Store C# Application: Reading a network stream

Here's a little snippet that will allow a Windows Store C# application send a command string to a server and then get a reply:

private async Task<string> DoCommand(string command)
{
    StringBuilder strBuilder = new StringBuilder();
    using (StreamSocket clientSocket = new StreamSocket())
    {
        await clientSocket.ConnectAsync(_serverHost, _serverPort);
        using (DataWriter writer = new DataWriter(clientSocket.OutputStream))
        {
            writer.WriteString(command);
            await writer.StoreAsync();
            writer.DetachStream();
        }
        using (DataReader reader = new DataReader(clientSocket.InputStream))
        {
            reader.InputStreamOptions = InputStreamOptions.Partial;
            await reader.LoadAsync(8192);
            while (reader.UnconsumedBufferLength > 0)
            {
                strBuilder.Append(reader.ReadString(reader.UnconsumedBufferLength));
                await reader.LoadAsync(8192);
            }
            reader.DetachStream();
        }
    }
    return (strBuilder.ToString());
}

What's important is the loop that will get the data until the end of the stream. This example is for a server that will reply some data and then close the connection; it's not suitable for an endless stream of data. I use this particular example to connect to CGMiner's api, where I send it a command string and it replies with some data, then close the connection.

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