i'm no guru, but here's a couple of things that you might try:
{$PACKRECORDS C} to make sure about that struct (gives me problems on
osx if i don't use it)
BN_ULONG *d;
what is BN_ULONG? make sure it's the same size of:
d:pointer;
you forgot the calling convention here:
Type
TBN_bn2hex = function(a:BNPtr):PChar;
should have cdecl?
LibHandle := LoadLibrary('libeay32.dll');
_BnBn2Hex := GetProcAddress( BnLibHandle, 'BN_bn2hex');
i assume that LibHandle should be BnLibHandle? what are the errors you get?
to get the general idea, see:
http://community.freepascal.org:10000/docs-html/prog/progse53.html#x240-24300012.3
good luck
henry
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