private void pHandleOverlappedRead(int Bytes2Read)
{
this.muOverlapped.hEvent = Rs232.CreateEvent(0, 1, 0, (string)null);
if (this.muOverlapped.hEvent == 0)
{
throw new ApplicationException("Error creating event for overlapped read.");
}
int num = 0;
if (!this.mbWaitOnRead)
{
this.mabtRxBuf = new byte[checked (Bytes2Read - 1 + 1)];
if (Rs232.ReadFile(this.mhRS, this.mabtRxBuf, Bytes2Read, ref num, ref this.muOverlapped) == 0)
{
int lastError = Rs232.GetLastError();
if (lastError != 997)
{
throw new ArgumentException("Overlapped Read Error: " + this.pErr2Text(lastError));
}
this.mbWaitOnRead = true;
}
//else if (this.DataReceivedEvent != null)
// this.DataReceivedEvent(this, this.mabtRxBuf);
}
if (!this.mbWaitOnRead)
{
return;
}
switch (Rs232.WaitForSingleObject(this.muOverlapped.hEvent, this.miTimeout))
{
case 0:
if (Rs232.GetOverlappedResult(this.mhRS, ref this.muOverlapped, ref num, 0) == 0)
{
int lastError = Rs232.GetLastError();
if (lastError == 996)
{
throw new ApplicationException("Read operation incomplete");
}
throw new ApplicationException("Read operation error " + lastError.ToString());
}
//if (this.DataReceivedEvent != null)
// this.DataReceivedEvent(this, this.mabtRxBuf);
this.mbWaitOnRead = false;
break;
case 258:
throw new Rs232.IOTimeoutException("Timeout error");
default:
throw new ApplicationException("Overlapped read error");
}
}
private bool pHandleOverlappedWrite(byte[] Buffer)
{
this.muOverlappedW.hEvent = Rs232.CreateEvent(0, 1, 0, (string)null);
if (this.muOverlappedW.hEvent == 0)
{
throw new ApplicationException("Error creating event for overlapped write.");
}
Rs232.PurgeComm(this.mhRS, 12);
this.mbWaitOnRead = true;
int num = 0;
bool flag = false;
if (Rs232.WriteFile(this.mhRS, Buffer, Buffer.Length, ref num, ref this.muOverlappedW) == 0)
{
int lastError = Rs232.GetLastError();
if (lastError != 997)
{
throw new ArgumentException("Overlapped Read Error: " + this.pErr2Text(lastError));
}
if (Rs232.WaitForSingleObject(this.muOverlappedW.hEvent, -1) == 0)
{
if (Rs232.GetOverlappedResult(this.mhRS, ref this.muOverlappedW, ref num, 0) == 0)
{
flag = true;
}
else
{
this.mbWaitOnRead = false;
//if (this.TxCompletedEvent != null)
// this.TxCompletedEvent(this);
}
}
}
else
{
flag = false;
}
Rs232.CloseHandle(this.muOverlappedW.hEvent);
return(flag);
}
