Sending a byte over the serial port

  • Thread starter Thread starter Ringo
  • Start date Start date
R

Ringo

I'm trying to send numbers over the serial port as bytes, not strings.
What I mean is if I want to send a 255, that should be 1 byte, not a 2
followed by a 5 and a 5. I'm trying to convert a borland c++ app.

This is what the c++ app does
int8B = 255;
WriteFile(serialPort,&int8B,1,&bytesWritten,NULL);
int8 = gainSlider->Position;
WriteFile(serialPort,&int8,1,&bytesWritten,NULL);
int8 = offsetSlider->Position;
WriteFile(serialPort,&int8,1,&bytesWritten,NULL);
int8 = exposureSlider->Position;
WriteFile(serialPort,&int8,1,&bytesWritten,NULL);


Here is what I'm doing that does not work
int x = 255;
sp.WriteLine(String.Format("{0}", x));
sp.WriteLine(String.Format("{0}", trackBar_Gain.Value));
sp.WriteLine(String.Format("{0}", trackBar_Offset.Value));
sp.WriteLine(String.Format("{0}", trackBar_Exposure.Value));

How do I send the 255? I can't do sp.WriteLine(255) since it wants a
string.
any help will be greatly appreciated.
Ringo
 
Ringo said:
I'm trying to send numbers over the serial port as bytes, not strings.
What I mean is if I want to send a 255, that should be 1 byte, not a 2
followed by a 5 and a 5. I'm trying to convert a borland c++ app.

This is what the c++ app does
int8B = 255;
WriteFile(serialPort,&int8B,1,&bytesWritten,NULL);
int8 = gainSlider->Position;
WriteFile(serialPort,&int8,1,&bytesWritten,NULL);
int8 = offsetSlider->Position;
WriteFile(serialPort,&int8,1,&bytesWritten,NULL);
int8 = exposureSlider->Position;
WriteFile(serialPort,&int8,1,&bytesWritten,NULL);


Here is what I'm doing that does not work
int x = 255;
sp.WriteLine(String.Format("{0}", x));
sp.WriteLine(String.Format("{0}", trackBar_Gain.Value));
sp.WriteLine(String.Format("{0}", trackBar_Offset.Value));
sp.WriteLine(String.Format("{0}", trackBar_Exposure.Value));

How do I send the 255? I can't do sp.WriteLine(255) since it wants a
string.
any help will be greatly appreciated.
Click to expand...

Isn't there a .Write method that accepts a byte array? That will avoid the
conversion to ASCII text.
 
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