Solved How to hook static bool(string)

Shawn_Ares · Sep 8, 2024

Code:

    // RVA: 0x135F8F4 Offset: 0x135F8F4 VA: 0x135F8F4
    public static bool JoinRoom(string RoomName) { }

As you can see, I'd like to hook this func, the bool represents whether you successfully entered a room,I have tried but it doesn't work.

This is my code:

Code:

bool JoinRoom;
bool (*old_JoinRoom)(monoString * Name);
bool OnJoinRoom(monoString * Name ) {
    if (JoinRoom) {
        old_JoinRoom(String_CreateString(get_StringInstance,RoomName));
        JoinRoom = false;
        return 1;
    }
    return old_JoinRoom(Name);
}

Code:

MSHookFunction((void *) getAbsoluteAddress("libil2cpp.so", 0x135F8F4), (void *) &OnJoinRoom, (void **) &old_JoinRoom);

Plz come to help me with this :( !

Shawn_Ares · Sep 13, 2024

Solved. Thank u bro by the way. I used any update() to help hooking and then it works :)

Shawn_Ares · Sep 8, 2024

By the way, there's no instance or update func around.

russellhunts · Sep 11, 2024

Hello, I think the signature of your OnJoinRoom function does not match the signature of the JoinRoom function you are trying to hook. The JoinRoom function takes a string parameter, not a monoString* parameter.
Here is a revised version of your code:

Code:

cpp
#include <string> // Include necessary headers

bool JoinRoomSuccess; // Declare a flag to track successful room joining
bool (*old_JoinRoom)(std::string RoomName); // Define the function pointer

bool OnJoinRoom(std::string RoomName) {
    if (JoinRoomSuccess) {
        // Call the original JoinRoom function with the provided RoomName
        old_JoinRoom(RoomName);
        JoinRoomSuccess = false;
        return true; // Indicate successful room joining
    }
    // Call the original JoinRoom function with the provided RoomName
    return old_JoinRoom(RoomName);
}

// Hooking function
MSHookFunction((void *)getAbsoluteAddress("libil2cpp.so", 0x135F8F4), (void *)&OnJoinRoom, (void **)&old_JoinRoom);

In this revised version, the OnJoinRoom function takes a std::string parameter RoomName to match the signature of JoinRoom. This function then calls the original function old_JoinRoom with the provided RoomName. Remember to adjust any other parts of your code accordingly to ensure consistency and compatibility with the rest of your implementation.

Shawn_Ares · Sep 13, 2024

Solved. Thank u bro by the way. I used any update() to help hooking and then it works :)

Numark · Sep 19, 2024

Shawn_Ares said:
Solved. Thank u bro by the way. I used any update() to help hooking and then it works :)

Don't forget, you can hook any static methods inside Update. Just make sure you don't call any instance in a static method.

quangcha · Sep 20, 2024

Numark said:
Don't forget, you can hook any static methods inside Update. Just make sure you don't call any instance in a static method.

Could you give me a few examples?

Numark · Sep 21, 2024

quangcha said:
Could you give me a few examples?

You have static methods like these. Static methods is already in a class, meaning you don't have to create an additional parameter by creating an "instance". You can call any static methods without those objects/instance. Static is shared across all INSTANCES. You can call it ANYWHERE from ANY CLASS by creating the function pointer for it. set_timeScale is from the class Time. You can call that in any classes like Player, Weapons, ETC because it's "static".

Numark · Sep 21, 2024

russellhunts said:
Hello, I think the signature of your OnJoinRoom function does not match the signature of the JoinRoom function you are trying to hook. The JoinRoom function takes a string parameter, not a monoString* parameter.
Here is a revised version of your code:

Code:

cpp #include <string> // Include necessary headers bool JoinRoomSuccess; // Declare a flag to track successful room joining bool (*old_JoinRoom)(std::string RoomName); // Define the function pointer bool OnJoinRoom(std::string RoomName) { if (JoinRoomSuccess) { // Call the original JoinRoom function with the provided RoomName old_JoinRoom(RoomName); JoinRoomSuccess = false; return true; // Indicate successful room joining } // Call the original JoinRoom function with the provided RoomName return old_JoinRoom(RoomName); } // Hooking function MSHookFunction((void *)getAbsoluteAddress("libil2cpp.so", 0x135F8F4), (void *)&OnJoinRoom, (void **)&old_JoinRoom);

In this revised version, the OnJoinRoom function takes a std::string parameter RoomName to match the signature of JoinRoom. This function then calls the original function old_JoinRoom with the provided RoomName. Remember to adjust any other parts of your code accordingly to ensure consistency and compatibility with the rest of your implementation.

You cannot use std::string, but only able to convert the std::string into using Il2cpp's string method. Unity uses it's own implementation for strings with .NET Framework. std::string differents from C++. You can either use std::string to and convert it for C-Style or just use monoString to make it easier.

quangcha · Sep 21, 2024

Numark said:
View attachment 668598

You have static methods like these. Static methods is already in a class, meaning you don't have to create an additional parameter by creating an "instance". You can call any static methods without those objects/instance. Static is shared across all INSTANCES. You can call it ANYWHERE from ANY CLASS by creating the function pointer for it. set_timeScale is from the class Time. You can call that in any classes like Player, Weapons, ETC because it's "static".

i have function:
// RVA: 0x527F868 Offset: 0x527F868 VA: 0x527F868
public bool ImmuneDamage(ref HurtDataInfo hurt) { }
and struct HurtDataInfo like this:

public struct HurtDataInfo // TypeDefIndex: 13245
{
// Fields
public PoolObjHandle<LActorRoot> atker; // 0x0
public PoolObjHandle<LActorRoot> orignalAtker; // 0x10
public PoolObjHandle<LActorRoot> target; // 0x20
public PoolObjHandle<LActorRoot> triggerActor; // 0x30
public string atkerName; // 0x40
public HurtAttackerInfo attackInfo; // 0x48
public SkillSlotType atkSlot; // 0x9C
public HurtTypeDef hurtType; // 0xA0
public ExtraHurtTypeDef extraHurtType; // 0xA4
public int hurtValue; // 0xA8
.......................
// RVA: 0x31B8560 Offset: 0x31B8560 VA: 0x31B8560
public void Init() { }

}
. I don't know how to take string atkerName, Could you help me?

DaRealPanDa · Nov 17, 2024

Thread will be set to "solved" and closed.
When you're not happy with that just send me a message and i will re-open the thread for you.

Thanks.

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