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You can use a Call Library Function Node to access external C functions. You must create a DLL on the host computer so you can place these nodes on the block diagram and configure them correctly. Alternatively, you can create a dummy DLL, also called a stub DLL, on the host computer. When you build a VI into a PDA or Touch Panel application that uses C code, you must include the .c file in the build specification. LabVIEW builds and links these files in the PDA or Touch Panel application.

If you wire large arrays to or from a Call Library Function Node, you might notice execution delays. You can avoid these execution delays by using a DLL function that partially updates the arrays.

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