/// <summary>
/// Returns information about data in the pipe
/// </summary>
public int GetBytesAvailable()
{
// check object state
if (_disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (_instance == null)
{
throw new InvalidOperationException("Pipe is not connected");
}
// check pipe buffer
int bytesRead;
int totalBytes;
int bytesLeftThisMessage;
bool error = PipeNative.PeekNamedPipe(
_instance.Handle,
IntPtr.Zero,
0,
out bytesRead,
out totalBytes,
out bytesLeftThisMessage);
if (!error)
{
// error occured
throw new PipeIOException(Marshal.GetLastWin32Error(), "Could not read data from the pipe: " + _instance.Name);
}
return(totalBytes);
}
/// <summary>
/// Copies data into a buffer without removing it from the pipe
/// </summary>
public int Peek(byte[] buffer, int offset, int size)
{
// check object state
if (_disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (_instance == null)
{
throw new InvalidOperationException("Pipe is not connected");
}
// parameters validation
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0 || offset > buffer.Length)
{
throw new ArgumentOutOfRangeException("offset");
}
if (size < 0 || size > buffer.Length - offset)
{
throw new ArgumentOutOfRangeException("size");
}
// read data from the pipe
GCHandle gcBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
int bytesRead;
int totalBytes;
int bytesLeftThisMessage;
bool error = PipeNative.PeekNamedPipe(
_instance.Handle,
Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset),
size,
out bytesRead,
out totalBytes,
out bytesLeftThisMessage);
gcBuffer.Free();
if (!error)
{
// error occured
throw new PipeIOException(Marshal.GetLastWin32Error(), "Could not read data from the pipe: " + _instance.Name);
}
return(bytesRead);
}