How to use the node function call library for a function in the dll with the data SUB type

Hi all

I would ask for your kind help

I am facing a problem with the call library node.

I have a C++ (stdcall) function, which has Sub as data type

XXXX error code (hwnd, lid, getValue, * Sub data1, * Sub data2)

data1 and data2 types are constantly changing based on the value of 'getValue '.

Mainly I can use the call library node several times and adapt each node according to the types of data data1, data2 and extract the values and use in the code. Here is no question. Real question is:

My question:

How can I use a node of library time call and make a case according to the 'getvalue', who will control the data1, data2 data type. Here I really seeking solutions.

My tests:

I used varaints as entry to the libray call node of the data1, data2 and selected parameters in the call libraby node as "Adapt to type. Here labview just crashed.

I appreciate your suggestions to feedbackand.

Thank you

Karine

You must allocate enough space for data1 and data2, and then pass a pointer to this space. An easy way to do this is the function to initialize table. Set the U8 type and size for the number of bytes required. Pass this array to the function as a pointer of table data.

After the function call returns, you need to extract the data in the table. You can do it manually, but a simple approach is to use the array of bytes to a string. Then, in a housing structure, use Unflatten chain to convert the string to the correct data type. This method also converts the "endianness" which will be probably necessary; Be sure to only set all entries for unflatten correctly.

Tags: NI Software

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