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Subscript used on non-accessible variable

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This is my code:

While 1
    While WinActive("PicTor - ") AND NOT WinActive("PicTor - Microsoft Visual Studio")  ; PicTor
        $pos = WinGetPos("[ACTIVE]")
        $size = WinGetClientSize("[ACTIVE]")
        If $pos[0] = 0 AND $pos[1] = 0 AND $size[0] = 1920 AND $size[1] = 1080 Then
            ; do something
        EndIf
        Sleep(10)
    WEnd
    Sleep(10)
WEnd

I get this error message sometimes when loosing focus off the "PicTor" window. When minimizing "PicTor" for example. I don't understand why... Why can't the script access $size[0]? I just declared it.

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Since WinGetClientSize() returns an array in case of success, you could also check the variable with IsArray

 


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