在c#中流式传输图像时的“工件”

时间:2013-04-04 16:58:30

标签: c# image stream artifacts

我想创建一个通过网络流式传输多个图像的项目。我只是想从小的,功能性的代码开始,但我已经遇到了一个时髦的问题。收到图像,但它包含图形错误,就像它只是它的一部分。

可悲的是,无法显示图像低的原因,这里是链接。 http://img543.imageshack.us/img543/1508/buggedy.jpg

当然,百万美元的回答。 ^^

TcpListener listener;
TcpClient client;
TcpClient datatoclient;
NetworkStream stream;

主持人部分:

listener = new TcpListener(5000);
listener.Start();
datatoclient = listener.AcceptTcpClient();
NetworkStream nowystream = datatoclient.GetStream();

MemoryStream ms = new MemoryStream();
byte[] image = File.ReadAllBytes("default.jpg");

switch (trackBar1.Value)
{
      case 0:
          image = File.ReadAllBytes("mirrion.jpg");
          break;
      case 1:
          image = File.ReadAllBytes("tenis.jpg");
          break;
      case 2:
          image = File.ReadAllBytes("marisasold.jpg");
          break;
}


// get the image size in bytes
int numberOfBytes = image.Length;

// put the size into an array
byte[] numberOfBytesArray = BitConverter.GetBytes(numberOfBytes);

// send the image size 
nowystream.Write(numberOfBytesArray, 0, numberOfBytesArray.Length);

// send the image 
nowystream.Write(image, 0, numberOfBytes);

客户端部分:

client = new TcpClient("127.0.0.1", 5000);
stream = client.GetStream();

byte[] data = new byte[4];
// read the size
stream.Read(data, 0, data.Length);
int size = BitConverter.ToInt32(data, 0);
label1.Text = size.ToString();

// prepare buffer
data = new byte[size];

// load image
stream.Read(data, 0, data.Length);

// save image to file for test
File.WriteAllBytes("received.jpg", data);

MemoryStream MS = new MemoryStream(data);

pictureBox1.Image = Image.FromStream(MS);

1 个答案:

答案 0 :(得分:3)

stream.Read不保证它会读取data.Length个字节。相反,它返回读取的字节数。因此,您应检查其返回值并继续读取,直到获得所有字节。

请参阅http://msdn.microsoft.com/en-us/library/system.io.stream.read(v=vs.90).aspx(第Return Value部分)

读取方法可以是这样的

void Read(Stream stream, byte[] buffer,int offset,int len)
{
    int read = 0;
    while (read < len)
    {
        read += stream.Read(buffer, offset + read, len-read);
    }
}