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DarkBASIC Professional Discussion / Help with array setup for items

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wickedly kick it
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Posted: 5th Sep 2014 04:38
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It's been a while since i diddled in dark basic pro, but i'm making a game engine for my games right now, and i'm working on items, and each item has a "Flag" associated that effects the way each item behaves later in code, however i need multiple flags for this type, and i know it is impossible to put arrays in UDTs, but is there a work around?
What i'm working with:


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WickedX
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Posted: 5th Sep 2014 04:50
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If you setup your array as an array of UDT's. You can use a DBPro trick and set a DWORD value equal to the UDT array. This will set the DWORD value as a pointer to the array. Then store the DWORD in your original UDT.

arrayPtr as dword
arrayPtr = myArray()

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wickedly kick it
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Posted: 5th Sep 2014 04:57
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aha! thanks

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WickedX
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Posted: 5th Sep 2014 05:06 Edited at: 5th Sep 2014 05:14
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You could also use - make memblock from array - and store the memblock ID in your UDT.

Edit: If your array contains string values the memblock will contain pointers the the strings.

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luskos
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Posted: 8th Sep 2014 05:43
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This looks interesting.I've never used pointers before.Can you give definition of a pointer and for what it's used best for.Simple example of pointer in action will be most appretiated.

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WickedX
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Posted: 8th Sep 2014 14:29
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This is a simple little demo. It is using a UDT array with a string and an integer value. Pointers are used to print the values. Look in the help file under Principles - Data types and variables, for more on pointers.



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luskos
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Posted: 8th Sep 2014 23:48
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What is "4" in the example?Why you inc ptr exactly that value?

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WickedX
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Posted: 9th Sep 2014 02:00
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After setting the pointer to the dword value, it will point to the first value. The first value is a string. So, the pointer is pointing to a dword pointer to the string. A dword occupies four bytes, thus to get the next value we increment the pointer by 4.

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