public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
{
IntPtr ptr = IntPtr.Zero;
try {
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0 || offset > short.MaxValue)
{
throw new ArgumentOutOfRangeException("offset");
}
// data block cannot be bigger than the value which we used in CAPI_REGISTER call.
if (count < 0 || count > _connection.Application.BDataLenght)
{
throw new ArgumentOutOfRangeException("count");
}
if ((buffer.Length - offset) < count)
{
throw new ArgumentException("Invalid offset");
}
if (_connection.Status != ConnectionStatus.Connected)
{
throw new NotSupportedException();
}
Debug.Assert(count <= short.MaxValue);
if (count >= short.MaxValue)
{
throw new NotSupportedException();
}
ptr = Marshal.AllocHGlobal(count);
Marshal.Copy(buffer, offset, ptr, count);
// build request
DataB3Request request = new DataB3Request();
request.Identifier.NCCI = _connection.NCCI;
request.Data = ptr;
request.DataLength = (short)count;
_dataHandle++;
request.DataHandle = _dataHandle;
MessageAsyncResult result = new MessageAsyncResult(this, request, callback, state);
_connection.Application.SendRequestMessage(result);
return(result);
} catch (Exception e) {
Trace.TraceError("Connection#{0}::BeginWriteData, Exception = {1}", ValidationHelper.HashString(this), e);
// clean memory
if (ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptr);
}
throw;
}
}
public override void EndWrite(IAsyncResult asyncResult)
{
try {
MessageAsyncResult result = asyncResult as MessageAsyncResult;
if (asyncResult == null || result == null)
{
throw (asyncResult == null) ? new ArgumentNullException("asyncResult") : new ArgumentException();
}
object o = result.InternalWaitForCompletion();
DataB3Request request = (DataB3Request)result.Request;
IntPtr ptr = request.Data;
if (ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptr);
}
if (o is Exception)
{
throw ((Exception)o);
}
} catch (Exception e) {
Trace.TraceError("Connection#{0}::EndWriteData, Exception = {1}", ValidationHelper.HashString(this), e);
throw;
}
}
