On 20.01.2017 23:36, fredvs wrote: > Re-hello. > > Ok, thanks Silvio, I will take this one from your advice, it works like > charm: > > type > TOggOpusFile = THandle; > TDArFloat = array of cfloat; > PDArFloat = ^TDArFloat; > > op_read: function(OpusFile: TOggOpusFile; pcm : PDArFloat; SampleCount: > Integer; li: pointer): Integer; > op_read_float: function(OpusFile: TOggOpusFile; pcm : PDArFloat; > SampleCount: Integer; li: pointer): Integer;
Gah! No! If a C function has a parameter of e.g. "float*" and it's an array you should use the same type in FPC, in that case "pcfloat". *DO NOT* use a Pascal dynamic array or (even worse) a pointer to a Pascal dynamic array. You can of course use a Pascal array when calling it like this: op_read_float(f, @arr[0], 42, whatever); If the C code however is the one allocating the array (in which case the type is usually a pointer to a pointer, like "float**" or "^pcfloat" in Pascal) then you *must not* use a Pascal array, but instead simply pass in a "pcfloat" variable like this: some_func(@mypcfloat); (though in that case to avoid confusion you *might* declare the parameter as "var arg: pcfloat" or "out arg: pcfloat" which would be the equivalent and then using "somefunc(mypcfloat) would work as well") You can then access the C array like you'd do with a Pascal array with "[]", like "mypcfloat[42]". Of course the C function should also tell you the resulting length somehow ;) I hope this clears up a few points for mixing C and Pascal arrays. Regards, Sven _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
