Variable not being recognized as a number - (Moved)

[juannfox]

Good morning, all. 

I have been working on this little proyect that scales images (for another OCR proyect) and I have bumped into an error:

The $Width variable (global) that has a numerical value is apparently not recognized as a number, since when I try to multiply it by the Scale factor (2) it results in 0. $Width is originated from string splitting the Resolution property of the chosen image. 

Code Below:

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#include <ExtProp.au3>
#include <MsgBoxConstants.au3>
#include <FileConstants.au3>
#include <AutoItConstants.au3>

Global $InputImage = @ScriptDir & "\Input.png"
Global $OutputImage = @ScriptDir & "\ScaledIMG.png"

GetImageSize ()
ScaleImage ()

;Obtiene dimensiones ANCHOxALTO de la imagen a procesar.
Func GetImageSize ()
    ;Obtiene propiedad nro. 31 (Windows 7) que contiene en un solo string ANCHOxALTO
    Global $ImageSize = _GetExtProperty($InputImage, 31)

    ;En caso de no obtener la resolución, será imposible luego determinar cuanto escalar la imagen.
    If $ImageSize = "0" Then
        Global $Scaleable = 0
        MsgBox ($MB_ICONERROR, "MDA-OCR", "Error al obtener dimensiones de imagen, no podrá escalarse la misma. La factura se procesará, pero su análisis no será preciso.")
    Else
        ;Separa los componentes de la dimensión en Ancho y Alto.
        Local $SizeComponent = StringSplit ($ImageSize, " x ", 1)

        Global $Scaleable = 1
        Global $Width = $SizeComponent[1]
        Global $Height = $SizeComponent[2]

    EndIf

EndFunc

Func ScaleImage ()

    Local $InfranViewExe = "IrfanViewPortable\IrfanViewPortable.exe"
;~     Local $InfranViewExe = "C:\Program Files\IrfanView\i_view64.exe"

    If $Scaleable = 1 Then
        Global $ScaleFactor = "2"
        Global $RezWidth = $Width * $ScaleFactor
        Global $RezHeight = $Height * $ScaleFactor

        RunWait ($InfranViewExe & " """ & $InputImage & """ /resize=(" & $RezWidth & "," & $RezHeight & ") /convert=""" & $OutputImage & """ /resample")

;This is the debug line, which outputs Resolution, then Width and Height (obtained from splitting resolution string) and the scaled W/H.
        MsgBox ($MB_SYSTEMMODAL, "Dimensiones", $ImageSize & "," & $Width & "," & $RezWidth & "," & $Height & "," & $RezHeight)
    Else
        FileMove ($InputImage, $OutputImage, $FC_OVERWRITE)
    EndIf

EndFunc

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The debug Message Brings me everything but the $RezWidth, which instead of being the double of $Width is "0".

 

Credits to the creator of ExtProp UDF.

[juannfox]

After many tries, I realized that converting it to binary and back to string, it would show a hidden character. So I solved it by trimming 1 character out of the string:

        Global $RawWidth = $SizeComponent[1]
        Global $Width = StringTrimLeft ($sWidth, 1)

Thanks for the help to those who took their time and read.

[JLogan3o13]

Moved to the appropriate forum.

Moderation Team

[BrewManNH]

You should never declare your global variables inside a function, just assign values to it in them. Second, don't declare variables inside an If structure, otherwise you might end up with undeclared variables later in the script if the comparison in the If structure fails for some reason. Declare them, then assign values to them in the If structure.