Prado, Renato (R.P.) schrieb:
You'll have to implement an wrapper, that allows to access the objects
and their methods by mere (non-OO) subroutines. That wrapper will have
to be written in the language of the library (here: C++), so that it
can
use the objects provided by the library, and can call their methods.
The
headers of the wrapper have to be converted into a unit (library?),
for
use from OPL code.
DoDi
By wrapper you mean generating a unit translating the interface from the
.h right?
A C++ library requires real code, that allows for communication with the
C++ objects. But if the header files already contain a C style
interface, no such wrapper code is required; in this case only a
translation from .h into .pas is required.
After I got the unit, how can I link the .lib into my project?
I have no experience in mixing FPC and C/C++ code into one executable.
Both languages come with their own RTL and other libraries, which can
not always coexist (initialization issues...). When the linker does not
reqest more C-specific modules than available with FPC, it might work.
The linker also must understand the object format of the compiled library.
I would not like to create a DLL in Visual C++ with the .lib inside just
to be able to use the .lib functions within Lazarus.
A DLL can be built with the Visual C++ linker, so that above issues go away.
DoDi
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