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流转换为0字节[重复]

.net-8.0 ftp stream wpf c#

RoseTeq · 技术社区 · 1 年前

在我安装了最新版本的Visual Studio 2022和之后。NET 8.0我在将流转换为文件时遇到了一个问题,要么保存本地文件,要么上传到FTP。

到目前为止,我一直在使用以下代码,这非常棒。

var bitmap = AlbumCover0.Source as BitmapSource;
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmap));

var stream = new MemoryStream();
stream.Position = 0;
encoder.Save(stream);

SessionOptions sessionOptions = FTP.Login(); // using WinScp ftp client

using Session session = new();
session.Open(sessionOptions);
//The following line was working, but now its uploading 0 bytes.
session.PutFile(stream, "/htdocs/Music/Covers/" + ItemTxt2.Text + ".png");

所以我将流转换为byte[],结果发现它有20357个字节。

var bitmap = AlbumCover0.Source as BitmapSource;
...
encoder.Save(stream);

byte[] bytes = stream.ToArray(); // bytes[20357] for example

SessionOptions sessionOptions = FTP.Login();
...
session.PutFile(stream, "/htdocs/Music/Covers/" + ItemTxt2.Text + ".png");  //Still uploading 0 bytes.

所以我试着先把它转换成FileStream,然后上传文件。但是仍然是0字节。

using (FileStream file = new FileStream("C:\\test.png", FileMode.Create))
{
     stream.CopyTo(file); //0 bytes.
}

session.DoPutFiles("C:\\test.png", "/htdocs/Music/Covers/" + ItemTxt2.Text + ".png", false, new TransferOptions() { TransferMode = TransferMode.Binary }); // for sure its uploading 0 bytes.

附件是文件C:\test.png Properties的屏幕截图。

enter image description here 文件:C:\test.png大小:0字节

1 回复 | 直到 1 年前

Guru Stron 1 年前

您需要调整流的位置之后你已经写信给它了。试着移动 stream.Position = 0; :

var stream = new MemoryStream();
encoder.Save(stream);

stream.Position = 0; // here

SessionOptions sessionOptions = FTP.Login(); // using WinScp ftp client

using Session session = new();
session.Open(sessionOptions);
//The following line was working, but now its uploading 0 bytes.
session.PutFile(stream, "/htdocs/Music/Covers/" + ItemTxt2.Text + ".png");

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