Help/Support Can't use MSFindSymbol

[princessXZ 580 iPhone 7 15.6]

Hey

I'm making hook code But my MSFindSymbol doesn't work

I tried to replace substrate.h with CydiaSubstrate/Framewrok one but still get error.
When I try to compile code,

I get this error

Tweak.xm:33:1: error: C++ requires a type specifier for all declarations
MSHookFunction(MSFindSymbol(NULL, "__ZN9GameScene20CalculateShootDamageEP9UserInforhf"), (void*)CalculateShootDamage, (void**)&org_CalculateShootDamage);

And this is my Tweak.xm

#import <CoreFoundation/CoreFoundation.h>
#import <substrate.h>
#import <Foundation/Foundation.h>
#define PLIST_PATH @"/var/mobile/Library/Preferences/com.zorba.prefbundle.plist"

inline bool GetPrefBool(NSString *key)
{
return [[[NSDictionary dictionaryWithContentsOfFile:PLIST_PATH] valueForKey:key] boolValue];
}

int64_t (*org_CalculateShootDamage)(void *self, unsigned char arg1, float arg2);

int64_t CalculateShootDamage(void *self, unsigned char arg1, float arg2){
  if (GetPrefBool(@"HackDamage")) {
    return 300;
  } else {
    return org_CalculateShootDamage(self, arg1, arg2);
  }
}

%hook AppController
// OpenDetected
-(void)applicationDidBecomeActive:(id)argument {
  if (GetPrefBool(@"DetectOpened")) {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"mcohack" message:@"Detected App opened!" delegate:nil cancelButtonTitle:@"Continue" otherButtonTitles:nil];
    [alert show];
    return %orig(argument);
  } else {
    return %orig(argument);
  }
}
// HackDamage
MSHookFunction(MSFindSymbol(NULL, "__ZN9GameScene20CalculateShootDamageEP9UserInforhf"), (void*)CalculateShootDamage, (void**)&org_CalculateShootDamage);
%end

 

And IDA screen

http://zorba.starfree.jp/ida.png

 

I thank this wonderful community!!

ps: I tried to hook with offset, It looks success but when called this function game crash. Is it erong type to use int64_t ? 😢

#import <substrate.h>
#import <Foundation/Foundation.h>
#import <mach-o/dyld.h>


float (*old_CalculateShootDamage)(void *self, unsigned char arg1, float arg2);

static int64_t CalculateShootDamage(void *self, unsigned char arg1, float arg2) {
    return old_CalculateShootDamage(self, arg1, arg2);
}

%ctor {
    MSHookFunction((void*)(_dyld_get_image_vmaddr_slide(0) + 0x1002B53CC),(void*)CalculateShootDamage,(void**)&old_CalculateShootDamage);
}

Next I tried to hack with vm_writedata . I set to origin hex one but game crash when function called..

@import Foundation;
@import UIKit;
#import <substrate.h>
#import "vm_writeData.h"

// To MSHook Offsets, use https://iosgods.com/topic/22718-mshook-offsets/
// To Generate Tweak.xm and Preferences Plist https://iosgods.com/topic/24138-code-inject/

#define PLIST_PATH @"/var/mobile/Library/Preferences/com.zorba.mcomods.plist"

inline bool GetPrefBool(NSString *key) {
		return [[[NSDictionary dictionaryWithContentsOfFile:PLIST_PATH] valueForKey:key] boolValue];
}


// Add your MS/Flex/MSHook Code here. Examples can be found on iOSGods.


%ctor {

	// Code Injection example
    if(GetPrefBool(@"key1")) {
      vm_writeData(0x1002B55F0, 0x15008052); //
    }

}

 

infomations:

IOS13.3.1 / iphone8 / theos latest version

Non unity game (cocos2dx)