Format exeption - why?

[Agrartec]

Hello,
:sign0013: i have a small problem, but can`t find the solution since hours.

I wrote a very small GPS-program and try to convert the speedoverground to Km/h.

this works fine:

textbox1.text = gps.speedoverground

this doesn`t:

textbox1.text = gps.speedoverground * 1.852


I recieve "format exeption". I tried several other ways, but always the same.

Thanks for answers.

 

[Erel]

This problem happens when there is no navigation data from the GPS.
In that case gps.SpeedOverGround returns "".
You can solve it with:
If gps.speedoverground = "" then textbox1.text = "0" else textbox1.text = gps.speedoverground * 1.852

 

[Agrartec]

Thank a lot, now I could go on very fast.

Btw, if there is a farmer speaking German here, please tell me. It would be nice to have someone who could test and understand my programs.

 

[lucifer1]

Im not a farmer But I speak german and have a GPS...