DLL, Call Library Function and IntanceDataPtr questions
Hi,
I want to create a Labview component that runs some C code. I have been trying with the Call Library Function, and I see it works to write external functions that get and return Labview data. But now, I need to store some internal data in the DLL. And, in case I have more than one CLB component calling to the same functions, the data they are going to use should related to the component that is calling the function. So, does anybody know how can I do it?
I have seen there is something call
The InstanceDataPtr is basically what the GetDSStorage() and SetDSStorage() functions provided for CINs. It is a pointer value LabVIEW maintains for each Call Library Node in a diagram and in the cases of reentrant VIs with Call Library Nodes for each instance of such a Call Library Node.
Your DLL can specifiy the three Callback functions ( I still think the name callback function is a mistake for this functionality) that all accept a reference to this InstanceDataPtr. These three functions Re
