jailbreak - iOS 6.1 Dynamic Library build and link -

i trying create dynamic library ios , load @ runtime. after taking @ this question , this answer, have been doing using iosopendev , deploying on iphone. xcode project dylib called kdylibtwo , files modiefied are:

kdylibtwo.h

#import <foundation/foundation.h>  @interface kdylibtwo : nsobject -(void)run; @end 

kdylibtwo.m

#import "kdylibtwo.h"  @implementation kdylibtwo  -(id)init {     if ((self = [super init]))     {     }      return self; }  -(void)run{     nslog(@"kdylibtwo loadded."); }  @end 

in order test if library works, after building profiling (the way iosopendev deploys on iphone), can find stored on device @ /usr/lib/libkdylibtwo.dylib , built tweak (again using iosopendev), hooking springboard follows:

#include <dlfcn.h>  %hook sbapplicationicon  -(void)launch{     nslog(@"\n\n\n\n\n\n\nsbhook libkdylibtwo.dylib");      void* dyliblink = dlopen("/usr/lib/libkdylibtwo.dylib", rtld_now);      if(dyliblink == null) {         nslog(@"loading failed.");     } else {         nslog(@"dylib loaded.");          void (*function)(void);         *(void **)(&function) = dlsym(dyliblink, "run");         if (function) {             nslog(@"function found.");             (*function)();         } else {             nslog(@"function not found");         }     }      nslog(@"end of code");     %log;     %orig; }  %end 

after installing tweak on device , tapping on icon (that fire hooked code), console output looks like:

aug 28 13:03:35 pudge springboard[18254] <warning>: sbhook libkdylibtwo.dylib aug 28 13:03:35 pudge springboard[18254] <warning>: dylib loaded. aug 28 13:03:35 pudge springboard[18254] <warning>: function not found aug 28 13:03:35 pudge springboard[18254] <warning>: end of code aug 28 13:03:35 pudge springboard[18254] <warning>: -[<sbapplicationicon: 0x1d5008c0> launch] 

my question doing wrong , the library's function not called or executed! think should clarify talking jailbroken devices , not app store development, please don't go ahead posting cannot done!

thank in advance,
panagiotis.

as victor ronin pointed out, "dlsym" c symbols. obtain objective-c class dylib linked @ runtime can use objc runtime functions. in case:

void* dyliblink = dlopen("/usr/lib/libkdylibtwo.dylib", rtld_now); id kdylibtwo = [[objc_getclass("kdylibtwo") alloc] init]; [kdylibtwo run]; 

first line linking library @ runtime. required in order use code inside of it.

second line creates instance of class kdylibtwo. objc_getclass function returns class object can later use create instances of class objective-c class - using alloc , init methods. once obtained class object objc_getclass can work him nothing happend. @ point can forget dynamically linked library @ runtime.

third line calling run method. can see, it's normal objective-c syntax. nothing changed because linked library @ runtime. can call method want.