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.
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