Help With Read Dialog Text

[minhduc0904]

Hi everyone, I am trying to use getDialogText () to get the text but it doesn't work and I don't know where I went wrong. Could you please help me?
This is the code I wrote:

!9::
#include SAMP.ahk ; Connecting samp udf but I don't know if this is the latest version for samp 0.3dl. This is my samp udf i use: https://github.com/SAMP-UDF/SAMP-UDF-for-AutoHotKey
if (isDialogOpen())
text := getDialogText()
msgbox, %text%
return