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If True = "stringvalue" Then says it matches.


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I accidently pulled the wrong value for a compare, but oddly it was showing as a Match so it wasn't until I reviewed my log files closely that I noticed a problem.

I was comparing a True value against a string value and it always came back as matching.

$PropertyValue = True
$Class = "String of characters"

If $PropertyValue = $Class Then
    ConsoleWrite("it matches?" & @CRLF)
    ConsoleWrite("it DOESN'T Match" & @CRLF)


I've corrected my code to pull the proper string value for $PropertyValue but just wondering why this was happening.


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When you make a comparison AutoIt will convert the second variable into the same datatype as the first - in this case a string into a Boolean. And as any string other than empty will convert to True, you get the match.

Look in the Help file under <Language Reference - Operators> - the bottom of the page for more info.

Top Tip: Never mix datatypes in comparisons - always force to a single datatype.


Edit: Also look under <Language Reference - Datatypes> - Boolean section.

Edited by Melba23

Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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4 hours ago, Melba23 said:

When you make a comparison AutoIt will convert the second variable into the same datatype as the first

Not completely true:

vd(1 = "1")
vd("1" = 1)
vd(1 = "0")
vd("0" = 1)
vd(1 = "True")
vd("True" = 1)
vd(1 = "False")
vd("False" = 1)
vd(True = "True")
vd("True" = True)
vd(True = "False")
vd("False" = True)
vd(("True" ? 1 : 0))
vd(("False" ? 1 : 0))

The function vd() is a variable dump, showing datatype and value. Results are:

Boolean            True
Boolean            True
Boolean            False
Boolean            False
Boolean            False
Boolean            False
Boolean            False
Boolean            False
Boolean            True
Boolean            True
Boolean            True
Boolean            True
String (4)         'True'
Double             0.0
Double             0.0
Int32              0
Int32              1
Int32              1

If AutoIt was to convert the second operand to the datatype of the first, then "False" = True would yield False, which isn't the case.

Interestingly, Number() returns a double when fed with the strings "True" or "False", in contradiction with the default (integer) claimed in the help.

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