C# 如何在不保存到驱动器的情况下将打印屏幕上传到 FTP

Question

我可以将打印屏幕上传到 FTP 而不将其保存在我的驱动器上吗？

在当前状态下，我将打印屏幕保存到驱动器 "E:\"，然后上传到 FTP。

保存图像：

 Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
 Screen.PrimaryScreen.Bounds.Height);
 Graphics graphics = Graphics.FromImage(bitmap as Image);
 graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
 bitmap.Save(@"E:\pic.jpg", ImageFormat.Jpeg);

上传至FTP：

using (var client = new WebClient())
 {
client.Credentials = new NetworkCredential("username", "password");
client.UploadFile("ftp://127.0.0.1/xy.jpg", WebRequestMethods.Ftp.UploadFile, @"E:\pic.jpg");
 }

Answer 1

可以将Bitmap保存到MemoryStream中，将结果加载到字节数组中，并将字节数组写入WebRequest流

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://127.0.0.1/xy.jpg");
request.Method = WebRequestMethods.Ftp.UploadFile;


request.Credentials = new NetworkCredential("username", "password");

byte[] fileContents;
using (MemoryStream sourceStream = new MemoryStream())
{
    Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
        Screen.PrimaryScreen.Bounds.Height);
    Graphics graphics = Graphics.FromImage(bitmap as Image);
    graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
    bitmap.Save(sourceStream, ImageFormat.Jpeg);
    fileContents = sourceStream.ToArray();
}

request.ContentLength = fileContents.Length;

using (Stream requestStream = request.GetRequestStream())
{
    requestStream.Write(fileContents, 0, fileContents.Length);
}

using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
{
    Console.WriteLine($"Upload File Complete, status {response.StatusDescription}");
}

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