Help/Support [Theos] Tweak doesn't do anything

ubyt3x · October 22, 2019

I've set up a theos project and wrote some hooks into the Tweak.x. It compiles fine and gives no errors.

But nothing wants to change inside the target app I'm trying to hook into - I'm using both MS Hooking and the method with MSHookFunction and MSFindSymbol.

I also have a hook written that should show an alert after a certain view gets loaded, but I won't get an alert either. UIKit is imported inside the Makefile.

For example, IDA gives me "___TtC5Untis6Person_firstName_" as function name, so I'm calling MSFindSymbol for that. It's an NSString so I return @"something". The default text still remains inside the app.

This is my Tweak.x:

@interface InfoCenterViewController : UIViewController
@end

NSString* firstName()
{
    return @"lol";
}

%ctor {
    MSHookFunction(
        ((void*) MSFindSymbol(NULL, "___TtC5Untis6Person_firstName_")),
        (void*) firstName,
        NULL);
}

%hook InfoCenterViewController

-(void) viewDidLoad {
    %orig;
    
    UIAlertView *alert = [[UIAlertView alloc]
        initWithTitle: @"UntisPro"
        message: @"yo this should show up bruh"
        delegate: self
        cancelButtonTitle: @"lol"
        otherButtonTitles: nil
    ];

    [alert show];
}

%end

Is something wrong? Is it even hooking correctly into the app?

I've made another project, tried hooking into SBLockScreenViewController and showing the same alert. It works fine there.

The bundle identifier is correct, I also tried it without any. Still doesn't do much.

Thanks!

Laxus · October 23, 2019

Why use mshookfunc when you can just simple mshook?

Salahah · October 23, 2019

1 hour ago, Laxus said:

Why use mshookfunc when you can just simple mshook?

Haloo

ubyt3x · October 23, 2019

11 hours ago, Laxus said:

Why use mshookfunc when you can just simple mshook?

As said, I already tried it with the MS Hooking with taking a look on the pinned tutorial about it here. It didn't work either.

AFAIK, this should look like this:

%hook Profile
 
-(bool) isPremium
{
    return true; # or YES?
}

%end
  
%hook Person

-(id) firstName # or -(NSString*) firstName
{
    return @"test";
}

%end

Just tested it in Flex 3, overriding methods there doesn't do anything either. One thing that is noticable is that when I override a name (there is a shortened name and the full name after you open the table item), the full name is not loaded and the short name will stay there. But it does not show the name I'm overriding it with.

Also, I tried hooking into different viewDidLoads, none of them shows my alert.

I think Theos will not do anything here. Overriding simple strings or booleans doesn't affect anything in-app. Maybe it is server loaded?