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Krocker

Wed Nov 03, 2010 4:52 pm


What Am I Doing Wrong!!!!!!!!!!!!!!!! Help!!!!!!!!!!! Urgent

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Can some one help me, what am i doing wrong. i keep getting an error and i dont understand http://compsci.ca/v3/images/smiles/icon_question.gif . the following is my coding/program: 


import GUI 

setscreen ("graphics:550;150") 

% Tells what the button has to do 
procedure Simplepressed 
Sys.Exec ("Simple.exe") 
end Simplepressed 

procedure Compoundpressed 
Sys.Exec ("Compound.exe") 
end Compoundpressed 

% Gives the buttons a variable and creates the button 
var button1 : int := GUI.CreateButton (140, 60, 2, "SIMPLE", Simplepressed) 
var button2 : int := GUI.CreateButton (20, 60, 2, "COMPOUND", Compoundpressed) 

% Intro Statement to the program 
put "WELCOME TO KB INTEREST CALCULATOR" 
colour (3) 
put "PLEASE CHOOSE ONE OF THE FOLLOWING TYPES OF INTERESTS" 

loop 
exit when GUI.ProcessEvent 
end loop 




 :?:  :?:  :?:


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TerranceN

Wed Nov 03, 2010 6:03 pm


RE:What Am I Doing Wrong!!!!!!!!!!!!!!!! Help!!!!!!!!!!! Urgent

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Next time say what error you are getting, but I'm guessing you get the error:

"Expression is not a procedure and hence cannot be called"

I don't understand why, but from reading the documentation, they always use Sys.Exec in a if statement, which works properly. So instead of


Sys.Exec("\\.\\Windows\\System32\\notepad.exe")


use


if Sys.Exec("\\.\\Windows\\System32\\notepad.exe") then
end if


which you can even use for error handling


if ~Sys.Exec("\\.\\Windows\\System32\\notepad.exe") then
    put "Error: "..
    put Error.LastMsg()
end if


Does anyone know specifically why you get that cryptic error? Why wouldn't Holtsoft just make it a procedure instead of having that error?


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TheGuardian001

Wed Nov 03, 2010 8:09 pm


Re: RE:What Am I Doing Wrong!!!!!!!!!!!!!!!! Help!!!!!!!!!!! Urgent

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"Expression is not a procedure and hence cannot be called"

I don't understand why, but from reading the documentation, they always use Sys.Exec in a if statement, which works properly
Turing enforces the difference between Functions and Procedures. If the method is stated to return a value, you MUST use that value, whether it is by assigning it to a variable, using it in a conditional, etc. It's the same reason turing uses "exit when GUI.ProcessEvent()" instead of just "GUI.ProcessEvent"

This specific method is a function because it returns a value indicating success/failure. I suppose they chose to do that because you're launching something outside of your own program, and will probably want to know if that program was successfully launched or not.