What is the proper method to access exported functions in a DLL compiled for a CE (Arm) target?

I have been trying without success to access functions in a DLL that is targetted for Windows CE. My Labview application target is an Arm-based TouchPanel device.
Solved!
Go to Solution.

Well, you can't load an ARM DLL into a VI that is loaded on Windows. The ARM DLL has a different object format, that the Windows loader doesn't know and even if it did, the Intel CPU can't interpret the ARM opcodes in that DLL.
In order to be able to load and debug your application on your host system, you need to create a so called stub library. This is a DLL, compiled for the host system, that provides one equally named function for every function in the target DLL, that you want to call. You create such a DLL in Visual Studio, by taking the header file and adding an (empty) function body to each function you want to call, and then compiling this into a DLL.
Of course you won't be able to debug the DLL call itself on the host system, unless you fill in some sensible functionality into the stub function yourself, but you can load the VI hierarchy and debug other aspects of your application.
I haven't played with this specific part of mobile development yet but I believe that you can debug the VI in question from your host system when you start it under the mobile target. But you still need to provide the stub DLL, so that LabVIEW can load the VI into memory. The actual execution happens on the target and the data is transfered back to the host system through a debug channel to be displayed in that VI, but the stub DLL is required so LabVIEW can load the entire VI hierarchy to allow debugging the VI.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Message was edited by:
Arun Varadarajan

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What is the proper method to access exported functions in a DLL compiled for a CE (Arm) target?

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