dynamically load a Mach-O library

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Rolf Nilsson - 07 Mar 2004 11:22 GMT

Hi,

I want to dynamically load a library (in this case the Lame mp3 encoder)
which is located in
/usr/local/bin/
the name of the library is "lame"

what function calls should I use?

I've never did this under OS X but am used to the similar things with OS 9
and Windows

I've googled for it but really don't know what the appropriate words to use
are

Thanks for any help

Rolf

Reply to this Message

Ben EJ - 07 Mar 2004 22:26 GMT

I'm trying to do the same thing. So far, I've found (just through
research, not actually trying to do it) that it is possible to use the
gcc dlopen, dlsym, dlclose functions by including dlfcn.h. However,
Macintosh suggests that you use its newer functions from the Mach-O
SDK - NSLoadImageFileFromFile, NSLinkModule, etc. located in the
header <mach-o/dyld.h>. I've found sample source that does this, so I
tried it myself. However, as I posted a few days ago, I am getting
"illegal bitfield" errors within the file loader.h, also included by
dyld.h. Maybe there is a setting I'm supposed to look for, or some
#define I should declare.

Also, the documentation on these functions talks about only loading
filed linked with the -bundle option. Does that mean I have to
compile my library as a bundle instead of a dynamic library? Not sure
how to proceed.

Reply to this Message

Mac Forum / Programming / CodeWarrior / March 2004

dynamically load a Mach-O library