我有一个android将数据（图像或文本）发送到C#应用程序的 Java 代码，以接收我使用异步套接字的这些数据。但是存在一个与BeginReceive()功能相关的问题是在发送图像时没有接收到完整的数据。那么我如何制作一种“循环”来接收完整的数据并在Picturebox上显示图像后（例如）？
形式
private Listener listener;
private Thread startListen;
private Bitmap _buffer;
public frmMain()
{
InitializeComponent();
}
private void serverReceivedImage(Client client, byte[] image)
{
try
{
byte[] newImage = new byte[image.Length - 6];
Array.Copy(image, 6, newImage, 0, newImage.Length);
using (var stream = new MemoryStream(newImage))
{
using (var msInner = new MemoryStream())
{
stream.Seek(2, SeekOrigin.Begin);
using (DeflateStream z = new DeflateStream(stream, CompressionMode.Decompress))
{
z.CopyTo(msInner);
}
msInner.Seek(0, SeekOrigin.Begin);
var bitmap = new Bitmap(msInner);
Invoke(new frmMain.ImageCompleteDelegate(ImageComplete), new object[] { bitmap });
}
}
}
catch (Exception)
{
System.Diagnostics.Process.GetCurrentProcess().Kill();
}
}
private delegate void ImageCompleteDelegate(Bitmap bitmap);
private void ImageComplete(Bitmap bitmap)
{
if (_buffer != null)
_buffer.Dispose();
_buffer = new Bitmap(bitmap);
pictureBox1.Size = _buffer.Size;
pictureBox1.Invalidate();
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
if (_buffer == null) return;
e.Graphics.DrawImage(_buffer, 0, 0);
}
private void startToolStripMenuItem_Click(object sender, EventArgs e)
{
startListen = new Thread(listen);
startListen.Start();
}
private void listen()
{
listener = new Listener();
listener.BeginListen(101);
listener.receivedImage += new Listener.ReceivedImageEventHandler(serverReceivedImage);
startToolStripMenuItem.Enabled = false;
}
听众
class Listener
{
private Socket s;
public List<Client> clients;
public delegate void ReceivedImageEventHandler(Client client, byte[] image);
public event ReceivedImageEventHandler receivedImage;
private bool listening = false;
public Listener()
{
clients = new List<Client>();
s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
}
public bool Running
{
get { return listening; }
}
public void BeginListen(int port)
{
s.Bind(new IPEndPoint(IPAddress.Any, port));
s.Listen(100);
s.BeginAccept(new AsyncCallback(AcceptCallback), s);
listening = true;
}
public void StopListen()
{
if (listening == true)
{
s.Close();
listening = false;
}
}
void AcceptCallback(IAsyncResult ar)
{
Socket handler = (Socket)ar.AsyncState;
Socket sock = handler.EndAccept(ar);
Client client = new Client(sock);
clients.Add(client);
sock.BeginReceive(client.buffer, 0, client.buffer.Length, SocketFlags.None, new AsyncCallback(ReadCallback), client);
client.Send("REQUEST_PRINT" + Environment.NewLine);
handler.BeginAccept(new AsyncCallback(AcceptCallback), handler);
}
void ReadCallback(IAsyncResult ar)
{
Client client = (Client)ar.AsyncState;
try
{
int rec = client.sock.EndReceive(ar);
if (rec != 0)
{
string data = Encoding.UTF8.GetString(client.buffer, 0, rec);
if (data.Contains("SCREEN"))
{
byte[] bytes = Encoding.UTF8.GetBytes(data);
receivedImage(client, bytes);
}
else // not is a image, is a text
{
// prepare text to show in TextBox
}
}
else
{
Disconnected(client);
return;
}
client.sock.BeginReceive(client.buffer, 0, client.buffer.Length, SocketFlags.None, new AsyncCallback(ReadCallback), client);
}
catch
{
Disconnected(client);
client.sock.Close();
clients.Remove(client);
}
}
}
客户
class Client
{
public Socket sock;
public byte[] buffer = new byte[8192];
public Client(Socket sock)
{
this.sock = sock;
}
public void Send(string data)
{
byte[] buffer = Encoding.ASCII.GetBytes(data);
sock.BeginSend(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback((ar) =>
{
sock.EndSend(ar);
}), buffer);
}
}
安卓代码
private byte[] compress(byte[] data) {
Deflater deflater = new Deflater();
deflater.setInput(data);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream(data.length);
deflater.finish();
byte[] buffer = new byte[1024];
while (!deflater.finished()) {
int count = deflater.deflate(buffer);
outputStream.write(buffer, 0, count);
}
outputStream.close();
byte[] output = outputStream.toByteArray();
return output;
}
public static DataOutputStream dos;
public static byte[] array;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
array = compress(bos.toByteArray());
//...
dos = new DataOutputStream(SocketBackgroundService.clientSocket.getOutputStream());
byte[] header = ("SCREEN").getBytes(StandardCharsets.UTF_8);
byte[] dataToSend = new byte[header.length + array.length];
System.arraycopy(header, 0, dataToSend, 0, header.length);
System.arraycopy(array, 0, dataToSend, header.length, array.length);
dos.writeInt(dataToSend.length);
dos.write(dataToSend, 0, dataToSend.length);
dos.flush();
版
我总是在此行中收到错误Invalid Parameter
var bitmap = new Bitmap(msInner);
并且使用压缩在这里也会发生同样的情况
z.CopyTo(msInner);
无效数据异常
分别在ServerReceivedImage()方法上。
使用这个
File.WriteAllBytes(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyPictures), "image.png"), newImage);
我注意到只接收 15KB（不使用压缩的文件大小）。