@error and divide by zero: newbie question

[Guest timrichardson]

I'm new to AutoIt, although my first script is working well and has solved a big problem. I love you all, and promply made a small donation.

I don't understand error trapping or error detection.

Why does this not work?

That is, I do not see the MsgBox.

the test on @error evaluates as false.

Where can I find documentation about the possible values of @error depending on the error?

$answer = 1 / 0

if @error then

MsgBox("Result is an error",0,0)

endif

[Jos]

I'm new to AutoIt, although my first script is working well and has solved a big problem. I love you all, and promply made a small donation.

I don't understand error trapping or error detection.

Why does this not work?

That is, I do not see the MsgBox.

the test on @error evaluates as false.

Where can I find documentation about the possible values of @error depending on the error?

$answer = 1 / 0

if @error then

MsgBox("Result is an error",0,0)

endif

<{POST_SNAPBACK}>

The value of @Error is set by the Functions used. Each functions documentation lists the possible values for @Error..

for example

Return Value

Success: Returns the position of the substring.

Failure: Returns 0 if substring not found.

@Error 0 - Normal operation

1 - Occurance was 0. Occurance must be a positive or negative integer.

[Ejoc]

Plus MsgBox is formatted incorrectly:

MsgBox(0,"","Result it an error")

[Blue_Drache]

Where can I find documentation about the possible values of @error depending on the error?

$answer = 1 / 0

if @error then

MsgBox("Result is an error",0,0)

endif

<{POST_SNAPBACK}>

As JdbE said, @error is set by a function. You only performed a simple math operation.

The values of @error are dependant on the function and may have multiple meanings. You have to look at each function in the help file to see if it sets @error and to what value if an unexpected operation occurs.

In your case, you'd have to put yours into a function:

$answer = _divide(1, 0)
   If @error = 1 then MsgBox(0,"Error","Division by zero")

Func _divide($x, $y)
   If $y = 0 then
      SetError(1)
      Return 0
   Else
      SetError(0)
      Return $x/$y
   Endif
EndFunc

[Guest timrichardson]

As JdbE said, @error is set by a function.  You only performed a simple math operation.

The values of @error are dependant on the function and may have multiple meanings.  You have to look at each function in the help file to see if it sets @error and to what value if an unexpected operation occurs.

In your case, you'd have to put yours into a function:

thanks, I would never have expected that.