Windows API: Using LoadLibrary and FreeLibary to dynamically call external procedures
2004-03-04 -- Andy Ireland
Newsgroups: softvelocity.public.clarion6
Hi Robert,
> Can you help me do that, or point me to the right direction on how to do
> that?
Yeah load the DLL using LoadLibrary / FreeLibrary
Get the addresses to the functions using GetProcAddress
Bind to functions like so....
map
module('typedefs') ! This would be the API declarion for each function
TestFunc::type(),long,type,pascal
end
module('aliases') ! a long ptr alias over the Func type decl below
TestFunc(long pf, ),long,name('__TestFunc'),pascal
end
module('mymodule')
TestFunc(TestFunc::type pf, ),long,name('__TestFunc'),pascal
end
end
TestFunc procedure(TestFunc::type pfTestFunc, )
code
return pfTestFunc()
compile('Unicode', _Unicode_)
pf = __GetProcAddress(hModule, szFuncW)
Unicode
omit('Ansi', _Unicode_)
pf = __GetProcAddress(hModule, szFuncA)
Ansi
? assert(pf)
if ~pf
return 0.
fSuccessful = true
return TestFunc(pf, )
The two overloaded defs allow you to pass the function address instead of a
clartion function type to the stub that makes the actual call to the
function in the Mapi32 DLL.
Regards
Andy
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