我正在制作一个简单的文件传输发送和接收应用程序。到目前为止,发送者将文件转换为字节数组并将该数组的块发送给接收者。
这适用于高达 256mb
的文件,但是对于大于此大小的任何内容,此行代码会抛出“内存不足”的异常:
byte[] buffer = StreamFile(fileName); //This is where I convert the file
我正在寻找一种方法以分块方式读取文件,然后写入该块而不是将整个文件加载到 byte
中。如何使用 FileStream
实现这一点?
编辑:
抱歉,这是我的糟糕代码:
private void btnSend(object sender, EventArgs e)
{
Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
byte[] fileName = Encoding.UTF8.GetBytes(fName); //file name
byte[] fileData = null;
try
{
fileData = StreamFile(textBox1.Text); //file
}
catch (OutOfMemoryException ex)
{
MessageBox.Show("Out of memory");
return;
}
byte[] fileNameLen = BitConverter.GetBytes(fileName.Length); //length of file name
clientData = new byte[4 + fileName.Length + fileData.Length];
fileNameLen.CopyTo(clientData, 0);
fileName.CopyTo(clientData, 4);
fileData.CopyTo(clientData, 4 + fileName.Length);
clientSock.Connect("172.16.12.91", 9050);
clientSock.Send(clientData, 0, 4 + fileName.Length, SocketFlags.None);
for (int i = 4 + fileName.Length; i < clientData.Length; i++)
{
clientSock.Send(clientData, i, 1 , SocketFlags.None);
}
clientSock.Close();
}
以下是我如何接收数据的方法(代码来自教程)
public void ReadCallback(IAsyncResult ar)
{
int fileNameLen = 1;
String content = String.Empty;
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
if (flag == 0)
{
Thread.Sleep(1000);
fileNameLen = BitConverter.ToInt32(state.buffer, 0);
string fileName = Encoding.UTF8.GetString(state.buffer, 4, fileNameLen);
receivedPath = fileName;
flag++;
}
if (flag >= 1)
{
BinaryWriter writer = new BinaryWriter(File.Open(receivedPath, FileMode.Append));
if (flag == 1)
{
writer.Write(state.buffer, 4 + fileNameLen, bytesRead - (4 + fileNameLen));
flag++;
}
else
writer.Write(state.buffer, 0, bytesRead);
writer.Close();
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
}
else
{
Invoke(new MyDelegate(LabelWriter));
}
}
我真的想知道如何以块的形式读取文件,以便我不需要将其转换为字节。
非常感谢到目前为止给我的回复,我觉得我开始理解了:D