Hello,

I have a requirement to create an API for application that C# can communicate with using dll (rather then REST). What is required by FPC to be able to create such DLL ?

Thanks,
Ido

And one other thing I forgot, it must support classes.

Thanks, Ido

That will simply not be possible. The C# class model is fundamentally different from FPC's. Even the reverse (using C# classes from FPC) is hardly possible (although crosstalk from atozed software does a good effort in Delphi).

Michael.

And one other thing I forgot, it must support classes.

You have to write an procedural wrapper around your class - each method gets an Procedure thar recieves the object as parameter and calls that object's method. These procedures are exported as stdcall as for an regular Windows DLL.

In C# you can write an class storing the FPC object as an IntPtr. The procedures from DLL are called using the P/Invoke mechanism.

Elmar

Thank you, it sounds like a good idea