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Problem in calling DLL file by Call Library function node

I am trying to combine labview with my previous fortran functions using Intel Visual Fortran 12.1 and labview 2012.

Actually, my VI works but I have not fully understood Call library function node's behaviour.

 

I use fortran function by below 2 steps.

 

 1. Compile Fortran functions as DLL file.

 2. Call Fortran function from LabView via "Call library function"

 

In step 2, DLL file without linker option "/DLL delayimp.lib" cannot be loaded by labview with the execution allow broken.

That is "delay load" is needed for DLL file.

 

Why delay load is needed for DLL file?

Are there any limitation or constraint in Call library function node or DLL file called by LabVIEW?

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