PureBasic Forums - English

Posted: **Fri Apr 02, 2010 5:23 pm**

Structure zoo
  Map cat.l()
EndStructure

*buf.zoo = AllocateMemory(SizeOf(zoo))

*buf\cat("felix") = 36

Debug *buf\cat("felix")

A variable of type zoo works without error, however the structured memory block causes an IMA.

Posted: **Fri Apr 02, 2010 5:27 pm**

You have to Initialisize the structure:

Code: Select all

 Structure  zoo
  Map cat.l()
EndStructure

*buf.zoo = AllocateMemory(SizeOf(zoo))
InitializeStructure(*buf, zoo)
*buf\cat("felix") = 36

Debug *buf\cat("felix")

greetings
Thomas

Posted: **Fri Apr 02, 2010 5:29 pm**

Thanks Thomas - so that's what InitializeStructure is for. The docs don't properly explain that.

Posted: **Fri Apr 02, 2010 5:34 pm**

I have asked in the German forum for this function and freak has explained the function to me

Posted: **Fri Apr 02, 2010 6:46 pm**

makes sense, thanks for the explanation ts

Posted: **Fri Apr 02, 2010 8:19 pm**

InitializeStructure() is a very powerful command you can use for example to create trees (which are some lists in lists in lists...). Its some kind of tricky, but very powerful, example:
http://www.purebasic.fr/german/viewtopi ... =8&t=22177

PureBasic Forums - English

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Re: Structured pointer access to map fails

Re: [Done] 4.5 b2 x86 Structured pointer access to map fails

Re: [Done] 4.5 b2 x86 Structured pointer access to map fails

Re: [Done] 4.5 b2 x86 Structured pointer access to map fails