#OnAutoItStartRegister and SQlite_startup()

[Edifice]

Hello

I thought the new #OnAutoItStartRegister feature was pretty cool, so I decided to use it to initiate SQlite.

I found that if you do that, scite will give you an error:

>"C:\Program Files\AutoIt3\SciTE\..\autoit3.exe" /ErrorStdOut "C:\Users\Lasse\Documents\My Dropbox\Programmering\Auto-IT\SQlite.au3"

C:\Program Files\AutoIt3\Include\SQLite.au3 (1168) : ==> Variable used without being declared.:

If @error Then Return $SQLITE_CORRUPT

If @error Then Return ^ ERROR

>Exit code: 1 Time: 0.511

Here is the code used:

#include <SQLite.au3>
#include <SQLite.dll.au3>
#OnAutoItStartRegister "program_start"

Func program_start()
    _SQLite_Startup ()
EndFunc

However, if you replace the OnAutoItStartRegister with a regular function call, it works perfectly:

#include <SQLite.au3>
#include <SQLite.dll.au3>
;#OnAutoItStartRegister "program_start"

program_start()

Func program_start()
    _SQLite_Startup ()
EndFunc

Hope someone can use this info for something

[jchd]

You're using a very old version of AutoIt. Go to the download page and update first Scite4AutoIt3 then latest AutoIt release.

[Edifice]

You're using a very old version of AutoIt. Go to the download page and update first Scite4AutoIt3 then latest AutoIt release.

I'm using newest release 3.3.6.0

This problem is with one of the features in V3.3.6.0 so I cannot understand why you would say it's an old version.

[jchd]

Oops, sorry, _I_ was mixing versions (I had to double check I didn't goof in SQLite.au3).

I'm looking at that.

[MHz]

Your calling _SQLite_Startup () before the constants are declared with the includes at the top of the script. AutoIt jumps directly to the Func program_start() EndFunc declaration and then it starts from the top of the script down.

This code does the same thing

#OnAutoItStartRegister "program_start"
$variable = 'OK'

Func program_start()
    If $variable Then
        MsgBox(0, '', $variable)
    EndIf
EndFunc

program_start() causes error of $variable being undeclared as the $variable declaration will not happen until after the execution of program_start() as defined by #OnAutoItStartRegister.

[jchd]

I was afraid ther could be an awful boo boo in the UDF, but hopefully SQLite.au3 has nothing to do with your problem, as MHz just explained.

What you can do in functions invoked by #OnAutoItStartRegister is limited to what resides inside the function(s) called, so no #include, no global declarations,^(*) etc.

In practice, there's no need to initialize SQLite in such contrived way, simply do something like (on the fly translate):

; SQLite
    _SQLite_Startup(@ScriptDir & "\sqlite3.dll", 1)
    If @error Then
        _ByeBox("SQLite3.dll can't be found.")
    EndIf
    OnAutoItExitRegister("_SQLite_ShutDown")

    ; auto-extension Unifuzz
    _SQLite_LoadAutoExtension(@ScriptDir & "\unifuzz.dll")
    If @error Then
        _ConsoleWrite("@error = " & @error & ', @extended = ' & @extended & @LF)
        _ByeBox("Error loading extension Unifuzz.")
    EndIf

    ; open temporary memory database
    $hMemDB = _SQLite_Open()
    OnAutoItExitRegister("_MemDbClose")
    _SQLite_Exec($hMemDB, "PRAGMA foreign_keys = 1;PRAGMA recursive_triggers = 1;")
...

IMHO, OnAutoItExitRegister() is much more useful to be sure things get closed/shutdown properly in the right order in all cases (except AI crash, but that's exceptional).

Edit: (*) this isn't exactly true: you can #include something, but it can't in turn define functions (remember we're already inside a function). You may as well define globals, but hiding them inside a function can be very tricky.

Edited March 16, 2010 by jchd