how to enumerate all available Wifi networks at range?

问题

I read on google that this is not possible, and that on OS 2.0, it was some undocumented Api to accomplish that, but then your app will got rejected ....

we are almosto on OS 4.0....any news regarding this?

回答1:

There are pre-2.0 solutions to be found on the Internet. One of them seems to be as follows:

void *libHandle;
void *airportHandle;
int (*open)(void *);
int (*bind)(void *, NSString *);
int (*close)(void *);

libHandle = dlopen("/System/Library/Frameworks/Preferences.framework/Preferences", RTLD_LAZY);
open = dlsym(libHandle, "Apple80211Open");
bind = dlsym(libHandle, "Apple80211BindToInterface");
close = dlsym(libHandle, "Apple80211Close");

open(&airportHandle);
bind(airportHandle, CFSTR("en0"));
close(&airportHandle);

dlclose(libHandle);

I'm not sure if accessing this framework is off limits. But running it causes a EXC_BAD_ACCESS. So either the code is wrong, the framework has changed or it's somehow locked. Forgive me for any obvious Objective-C faux-pas. I've only been speaking Objective-C since Thursday, so my Objective-C fluency is probably like parachuting a latin speaker into a hostile Transylvanian mountian region.

来源：https://stackoverflow.com/questions/3019336/how-to-enumerate-all-available-wifi-networks-at-range