[fpc-pascal] Calling C functions from FPC
jonas.maebe at elis.ugent.be
Mon Jan 26 08:20:29 CET 2009
On 26 Jan 2009, at 01:24, Ken G. Brown wrote:
> On MacOS X 10.5.6 Intel targeting 10.3.9 PPC:
> What are the gotchas with respect to calling C functions from FPC?
Mark the external C functions you import in your Pascal code as
procedure cTest; cdecl; external;
> What other issues might I have to watch out for?
Make sure that the types in your Pascal and C code match. The easiest
is to use the ctypes unit. Then you can use the common C-types by
prefixing them with "c" (e.g., cint, clong, clonglong, cuint, culong,
culonglong, cfloat, ...). And don't try to free pointers allocated in
the C code in Pascal code and vice versa.
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