Question

我在Windows窗体应用程序中实现了一个函数，用于从文件（sourcedata.data）捕获和读取所需的表格数据，并将其保存在另一个文件（result.data）中。我和使用该应用程序如何捕获这样的实时流数据：csv或.data文件中的https://data.sparkfun.com/streams以使用它。或者有没有直接的方法来定期直接从网站来源读取流数据？

[b -> c] -> [b] -> [c]

Answer 1

你有两个将你的问题分成两个独立的子问题：

编写一个方法public static string DownloadData(...)，它将从源代码下载数据。这可以通过您可以找到的任何HTTP客户端或库来完成，例如System.Net.Http.HttpClient或System.Net.WebClient。
- 请参阅How to download a file from a URL in C#?
添加/启动定时调用此方法的计时器。您可以使用System.Windows.Forms.Timer或System.Timers.Timer等类。
- 请参阅What is the best way to implement a "timer"?

Answer 2

@Progman 这是代码

 public partial class Download : Form
{
    public Download()
    {
        InitializeComponent();
    }

    WebClient client;
    private void btnDownload_Click(object sender, EventArgs e)
    {
        string url = txtUrl.Text;
        if (!string.IsNullOrEmpty(url))
        {
            Thread thread = new Thread(() =>
          {
              Uri uri = new Uri(url);
              string filename = System.IO.Path.GetFileName(uri.AbsolutePath);
              client.DownloadFileAsync(uri, Application.StartupPath + "/" + filename);

          });
            thread.Start();
        }

    }

    private void Download_Load(object sender, EventArgs e)
    {
        client = new WebClient();
        client.DownloadProgressChanged += Client_DownloadProgressChanged;
        client.DownloadFileCompleted += Client_DownloadFileCompleted;
    }

    private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
    {
        MessageBox.Show("Download Completed.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);

    }

    private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        Invoke(new MethodInvoker(delegate ()
        {
            progressBar.Minimum = 0;
            double recieve = double.Parse(e.BytesReceived.ToString());
            double total = double.Parse(e.TotalBytesToReceive.ToString());
            double percentage = recieve / total * 100;
            lblStatus.Text = $"Download {string.Format("{0:0.##}", percentage)}%";
            progressBar.Value = int.Parse(Math.Truncate(percentage).ToString());
        }));
    }
}

如何在Windows窗体应用程序中捕获csv或.data文件中的实时流数据

2 个答案: