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POiOS 6.1 Dynamic Library build and link
 

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    <p>I am trying to create a dynamic library for iOS and load it at runtime. After taking a look at <a href="https://stackoverflow.com/questions/4733847/can-you-build-dynamic-libraries-for-ios-and-load-them-at-runtime">this question</a> and <a href="https://stackoverflow.com/a/10509453/2161791">this answer</a>, I have been doing it using iOSOpenDev and deploying everything on my iPhone. The xCode project for the dylib is called KDylibTwo and the files I modiefied are:</p> <p><strong>KDylibTwo.h</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface KDylibTwo : NSObject -(void)run; @end </code></pre> <p><strong>KDylibTwo.m</strong></p> <pre><code>#import "KDylibTwo.h" @implementation KDylibTwo -(id)init { if ((self = [super init])) { } return self; } -(void)run{ NSLog(@"KDylibTwo loadded."); } @end </code></pre> <p>In order to test if my library works, after building it for profiling (the way iOSOpenDev deploys it on iPhone), I can find it stored on my device at <code>/usr/lib/libKDylibTwo.dylib</code> and built a tweak (again using iOSOpenDev), hooking the SpringBoard as follows:</p> <pre><code>#include &lt;dlfcn.h&gt; %hook SBApplicationIcon -(void)launch{ NSLog(@"\n\n\n\n\n\n\nSBHook For 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 **)(&amp;function) = dlsym(dylibLink, "run"); if (function) { NSLog(@"Function found."); (*function)(); } else { NSLog(@"Function NOT found"); } } NSLog(@"End of code"); %log; %orig; } %end </code></pre> <p>After installing the tweak on the device and tapping on an icon (that would fire the hooked code), the Console output looks like:</p> <pre><code>Aug 28 13:03:35 Pudge SpringBoard[18254] &lt;Warning&gt;: SBHook For libKDylibTwo.dylib Aug 28 13:03:35 Pudge SpringBoard[18254] &lt;Warning&gt;: Dylib loaded. Aug 28 13:03:35 Pudge SpringBoard[18254] &lt;Warning&gt;: Function NOT found Aug 28 13:03:35 Pudge SpringBoard[18254] &lt;Warning&gt;: End of code Aug 28 13:03:35 Pudge SpringBoard[18254] &lt;Warning&gt;: -[&lt;SBApplicationIcon: 0x1d5008c0&gt; launch] </code></pre> <p>My question is what am I doing wrong and the the library's function is not called or executed! I think I should clarify that I am only talking about jailbroken devices and not App Store development, so please don't go ahead posting that it cannot be done!</p> <p>Thank you in advance,<br> Panagiotis.</p>
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    1. COI'm not home and can't test right now. But, Victor is right that the technique i showed is for calling C functions, not Obj-C
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