Error Checking

[232showtime]

Hello World!!!

this is the first time I use Error checking and Im really confused with this, am I doing it correctly?.

I check the help file and came up with this

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#include <MsgBoxConstants.au3>
;1st example
Local $hWndR = wtf(WinExists("[CLASS:CalcFrame]"))

If @error Then
    MsgBox($MB_SYSTEMMODAL, "Error", "calculator does not Exist!!!")
Else
    MsgBox($MB_SYSTEMMODAL, "Result", "calculator Exist!!!")
EndIf
Exit

Func wtf($hWndR)
    If $hWndR < 1 Then
        SetError(2);where did you get this "2"
    ElseIf $hWndR > 1 Then
        SetError(1); and this "1"
    EndIf
    Return $hWndR
EndFunc   ;==>wtf

;~ 2nd Example
Local $hWndR = wtf(WinExists("[CLASS:CalcFrame]"))

If Not @error Then
    MsgBox($MB_SYSTEMMODAL, "Error", "calculator does not Exist!!!")
ElseIf @error Then
    MsgBox($MB_SYSTEMMODAL, "Result", "calculator Exist!!!")
EndIf
Exit

Func wtf($hWndR)
    If $hWndR = 1 Then
        SetError(2)
    ElseIf $hWndR = -1 Then
        SetError(1)
    EndIf
    Return $hWndR
EndFunc   ;==>wtf

Please can someone enlighten me...

[water]

You have two functions with the same name ("wtf") in your scipt

[water]

You need to check the function you call in the help file.
Some denote an error in the return value (like WinExists), some other functions set macros @error / @extended.
I would simplify your script to:
 

#include <MsgBoxConstants.au3>
Local $hWndR = WinExists("[CLASS:CalcFrame]")
If $hWndR <> 1 Then
    MsgBox($MB_SYSTEMMODAL, "Error", "Calculator does not exist!")
Else
    MsgBox($MB_SYSTEMMODAL, "Result", "Calculator does exist!")
EndIf
Exit

 

Edited June 16, 2016 by water