Maximum cluster size?

Hi all,
I'm using LV 7.1 and am trying to access a function in a DLL. The function takes a pointer to a data structure that is large and complex. I have calculated that the structure is just under 15kbytes.
I have built the structure as a cluster and then attempted to pass the cluster into the call library function node with this parameter set as adapt to type. I get memory error messages and when analysing the size of the cluster I am producing it appears to be much smaller than required.
I have also tried creating an array and passing that but I think that won't work as it needs to be a fixed size of array which can only be acheived, according to what I've read, by changing it to a cluster and this is limited to a size of 256.
Does anybody have a suggestion of how to overcome this?
If any more detail is required then I'm happy to supply.
Dave.

John.P wrote:
Hi Dave,
You have already received some good advice from the community but I wanted to offer my opinion.
I am unsure as to why the cluster size will not exceed 45, my only suggestion is to try using a type cast node as this is the suggested method for converting from array to cluster with greater than 256 elements.
If this still does not work then in this case I would recommend that you do use a wrapper DLL, it is more work but due to the complexity of the cluster you are currently trying to create I would suggest this is a far better option.
Have a look at this KB article about wrapper DLL's.
Hope this helps,
John P
John, I am having a hard time converting an array of greater than 256 elements to a cluster. I attempted to use the type cast node you suggested and didn't have any luck. Please see the attached files... I’m sure I’m doing something wrong. The .txt file has a list of 320 elements. I want to run the VI so that in the end I have a cluster containing equal number of integer indicators/elements inside. But more importantly, I don't want to have to build a cluster of 320 elements. I'd like to just change the number of elements in the .txt file and have the cluster automatically be populated with the correct number of elements and their values. No more, no less. One of the good things about the convert array to cluster was that you could tell the converter how many elements to expect and it would automatically populate the cluster with that number of elements (up to 256 elements only). Can the type cast node do the same thing? Do you have any advice? I posted this question with more detail to my application at the link below... no luck so far.
http://forums.ni.com/ni/board/message?board.id=170&thread.id=409766&view=by_date_ascending&page=1
Message Edited by PhilipJoeP on 05-20-2009 06:11 PM
Attachments:
cluster_builder.vi ‏9 KB
config.txt ‏1 KB

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