Sending a byte over the serial port

[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(seria lPort,&int8B,1, &bytesWritten,N ULL);
int8 = gainSlider->Position;
WriteFile(seria lPort,&int8,1,& bytesWritten,NU LL);
int8 = offsetSlider->Position;
WriteFile(seria lPort,&int8,1,& bytesWritten,NU LL);
int8 = exposureSlider->Position;
WriteFile(seria lPort,&int8,1,& bytesWritten,NU LL);
Here is what I'm doing that does not work
int x = 255;
sp.WriteLine(St ring.Format("{0 }", x));
sp.WriteLine(St ring.Format("{0 }", trackBar_Gain.V alue));
sp.WriteLine(St ring.Format("{0 }", trackBar_Offset .Value));
sp.WriteLine(St ring.Format("{0 }", trackBar_Exposu re.Value));

How do I send the 255? I can't do sp.WriteLine(25 5) since it wants a
string.
any help will be greatly appreciated.
Ringo

[Ben Voigt]

"Ringo" <ri*********@gm ail.comwrote in message
news:11******** **************@ a75g2000cwd.goo glegroups.com.. .

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(seria lPort,&int8B,1, &bytesWritten,N ULL);
int8 = gainSlider->Position;
WriteFile(seria lPort,&int8,1,& bytesWritten,NU LL);
int8 = offsetSlider->Position;
WriteFile(seria lPort,&int8,1,& bytesWritten,NU LL);
int8 = exposureSlider->Position;
WriteFile(seria lPort,&int8,1,& bytesWritten,NU LL);
Here is what I'm doing that does not work
int x = 255;
sp.WriteLine(St ring.Format("{0 }", x));
sp.WriteLine(St ring.Format("{0 }", trackBar_Gain.V alue));
sp.WriteLine(St ring.Format("{0 }", trackBar_Offset .Value));
sp.WriteLine(St ring.Format("{0 }", trackBar_Exposu re.Value));

How do I send the 255? I can't do sp.WriteLine(25 5) since it wants a
string.
any help will be greatly appreciated.

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

Ringo