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Question

Creating a libsubstrate for iPhone Simulator.

Answer 1

+1 A:

If you simply need to use MSHookMessageEx (which superseded MSHookMessage), you can

#define MSHookMessageEx(class, selector, replacement, result) \
 (*(result) = method_setImplementation(class_getInstanceMethod((class), (selector)), (replacement)))

Of course, MSHookMessageEx in Mobile Substrate is more complex than this, but for testing purpose this is usually enough.

KennyTM 2010-02-01 06:31:54

ohh thanks for the reply.Can you please help me in using this too? I mean how to use it if i m hooking to SBApplicationIcon?Currently i have this code`Class _$SBAppIcon = objc_getClass("SBApplicationIcon");`MSHookMessage(_$SBAppIcon,@selector(launch), (IMP) `i got this code from some forum, and trying to learn that.

raziiq 2010-02-01 06:39:51

@raziiq: Yes. But the 4th argument should be a pointer to an `IMP` to receive the original launch method.

KennyTM 2010-02-01 06:48:16

oh yes , nil should be replaced by something like "__Original_Method", right?I am using the above mentioned code, but as i described in my question, i am getting that error of _MSHookMessage. So in order to use the method you just described, how can i change my code to the one you just described?

raziiq 2010-02-01 06:51:48

@raziiq: Yes, you should use `MSHookMessageEx`. (Don't insert this macro on the actual device though, as `libsubstrate` does provide the actual implementation.)

KennyTM 2010-02-01 08:36:13

Answer 2

A:

Thanks for the reply KennyTM. I have changed my code to his after your advice.

#define MSHookMessageEx(class, selector,replacement,result) \
(*(result) = method_setImplementation(class_getInstanceMethod((class), (selector)), (replacement)))

static IMP original_Launch;

static void __$AnotherCheck_AppIcon_Launch(SBApplicationIcon *_SBApplicationIcon) 
{
    UIAlertView* __launchView = [[UIAlertView alloc] init];
    __launchView.title = @"No way muchacho";
    __launchView.message = @"You can't touch dis!";
    [__launchView addButtonWithTitle:@"Dismiss"];
    [__launchView show];

}

extern "C" void AnotherCheckInitialize() 
{   
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
    // Get the SBApplicationIcon class
    Class _$SBAppIcon = objc_getClass("SBApplicationIcon");


    MSHookMessageEx(_$SBAppIcon, @selector(launch), __$AnotherCheck_AppIcon_Launch, (IMP *) &original_Launch);


    [pool release];
}

But i m getting these 2 errors at MSHookMessageEx line

error: invalid conversion from 'void ()(SBApplicationIcon)' to 'objc_object* (*)(objc_object*, objc_selector*, ...)'

error: initializing argument 2 of 'objc_object* (* method_setImplementation(objc_method*, objc_object* (*)(objc_object*, objc_selector*, ...)))(objc_object*, objc_selector*, ...)'

Any advice on these please?

raziiq 2010-02-01 11:30:40

Seems like you're compiling in C++. Anyway, cast `__$AnotherCheck_AppIcon_Launch` into an `IMP` on that line.

KennyTM 2010-03-11 07:33:32

no no, i am compiling in xcode, but still its giving me the errors

raziiq 2010-03-11 11:11:43

Answer 3

A:

http://www.ipodtouchfans.com/forums/showthread.php?t=103558 May be this can help you. Good luck.

2010-03-11 07:19:39

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Creating a libsubstrate for iPhone Simulator.

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