public int Read(int Bytes2Read)
{
if (Bytes2Read == 0)
{
Bytes2Read = this.miBufferSize;
}
if (this.mhRS == -1)
{
throw new ApplicationException("Please initialize and open port before using this method");
}
int num1 = 0;
try
{
if (this.meMode == Rs232.Mode.Overlapped)
{
this.pHandleOverlappedRead(Bytes2Read);
}
else
{
this.mabtRxBuf = new byte[checked (Bytes2Read - 1 + 1)];
int mhRs = this.mhRS;
byte[] mabtRxBuf = this.mabtRxBuf;
int nNumberOfBytesToRead = Bytes2Read;
int num2 = 0;
// ISSUE: explicit reference operation
// ISSUE: variable of a reference type
int lpNumberOfBytesRead = @num2;
Rs232.OVERLAPPED overlapped = (Rs232.OVERLAPPED)((object)null ?? Activator.CreateInstance(typeof(Rs232.OVERLAPPED)));
// ISSUE: explicit reference operation
// ISSUE: variable of a reference type
Rs232.OVERLAPPED lpOverlapped = @overlapped;
int num3 = Rs232.ReadFile(mhRs, mabtRxBuf, nNumberOfBytesToRead, ref lpNumberOfBytesRead, ref lpOverlapped);
if (num3 == 0)
{
throw new ApplicationException("ReadFile error " + num3.ToString());
}
if (num2 < Bytes2Read)
{
throw new Rs232.IOTimeoutException("Timeout error");
}
this.mbWaitOnRead = true;
num1 = num2;
}
}
catch (Exception ex)
{
ProjectData.SetProjectError(ex);
Exception innerException = ex;
throw new ApplicationException("Read Error: " + innerException.Message, innerException);
}
return(num1);
}
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");
}
}