On Tue, 8 Jun 1999, Holger Waechtler wrote:
> Who says, that our super driver is not able to load it's subdrivers
> dynamically ??
>
> (could you explain, how dlopen() is used ?? - works it on non-Unix
> platforms (MacOS, Dos, Windows) ?? -- if not, we could put some #ifdef's
> around it and link at unsupported platforms all subdrivers in the
> library.)
dlopen is really easy to understand:
/*
Grab the C math library - load it from disk NOW!
*/
void *handle = dlopen ( "libm.so", RTLD_NOW ) ;
/*
Grab the address of the sqrt() function
*/
my_sqrt = dlsym ( handle, "sqrt" ) ;
/*
Call the function
*/
x = (*my_sqrt)( 4 ) ;
/*
Dump the library to save memory (optional)
when you don't need it anymore.
*/
dlclose ( handle ) ;
...tada! (There is also a dlerror function)
There are similar functions available under Windoze - but
not with the same API - so some #ifdef WIN32's are going to
be needed.
I understand that there are still some Unixen that don't
have dlopen/dlsym/dlclose - I don't know what the deal
is with MacOS, Amiga and some of the other more obscure
platforms. I bet BeOS has dlopen - but I don't know
for sure.
Steve Baker (817)619-2657 (Vox/Vox-Mail)
Raytheon Systems Inc. (817)619-2466 (Fax)
Work: [EMAIL PROTECTED] http://www.hti.com
Home: [EMAIL PROTECTED] http://web2.airmail.net/sjbaker1
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