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Noob Question : How to compare NUL


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Hi everyone, I'm totally new to AutoIt.

Here is my script :

Dim $defaultIcon = ""
If $defaultIcon <> NUL Then
RegWrite ( "HKEY_CLASSES_ROOT\epubfile\DefaulfIcon", "", "REG_SZ", @WorkingDir & "\" & $defaultIcon)
RegWrite ( "HKEY_CLASSES_ROOT\epubfile\DefaulfIcon", "", "REG_SZ", @WorkingDir & "\cr3.exe,0")

I can't compare $defaultIcon with NUL.

Here I want my script to compare if the value of $defaultIcon is not null then it will set the default Icon of epubfile to specified icon file in $defaultIcon, otherwise it will set to exe file.

Please help. Thanks.

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Maybe this will help?

If $defaultIcon <> '' Then

All by me:

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From my dad

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Dim $defaultIcon = ""
If $defaultIcon Then
    RegWrite("HKEY_CLASSES_ROOT\epubfile\DefaulfIcon", "", "REG_SZ", @WorkingDir & "\" & $defaultIcon)
    RegWrite("HKEY_CLASSES_ROOT\epubfile\DefaulfIcon", "", "REG_SZ", @WorkingDir & "\cr3.exe,0")

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