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[C#] how to add and subtract from a value?
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flash harry
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PostPosted: Sun Aug 15, 2010 6:44 am    Post subject: Reply with quote
Pingo or anyone plz help

i can read/write to static address like this:

Code:
float Val = Mem.ReadFloat(0x345291FC);
            Mem.WriteFloat(0x345291FC, Val = 0.5F);


but what about read/write to a pointer + offsets?

now i have "0x344107DC" and the offset is "18" but i dont know how to write it.

before when i was using "ProcessMemoryReaderLib" i would just write it like this:

Code:

preader.ReadProcess = myprocess[0];
            preader.OpenProcess();
           
            int byteswritten;
            int bytesread;
            int value;
            int pointerbase;
            byte[] memory;
           
            memory = preader.ReadProcessMemory((IntPtr)0x344107DC, 4, out bytesread);
            pointerbase = BitConverter.ToInt32(memory, 0);
            pointerbase += 0x18;
            value = 99;
            memory = BitConverter.GetBytes(value);
            preader.WriteProcessMemory((IntPtr)pointerbase, memory, out byteswritten);


but now using this new reader "CSharpProcessMemory" im stuck on how to write to a pointer + offsets.

im totally baffled now ive tried all sorts of combos but to no avail

a quick google for "CSharpProcessMemory" got this
pastebin . com/hyXMyUzz

which seems to be what i am using

any help is very much appreicated
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AhMunRa
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PostPosted: Sun Aug 15, 2010 8:03 am    Post subject: Reply with quote
flash harry wrote:
so i have an address (its static) 0x345287A0 FLOAT and i need to add/subtract 300 from it,


Write a dll use C# ability to use extern.

In your dll

Code:

_asm {
     push esi
     pushad
     pushaf
     mov esi, address
     sub esi, 0x0000012C
     mov  [register+offset], esi
     popad
     popaf
     pop esi
}


I think will do what you want. My asm skills suck.

Where register is the location that your address is pointed from offset if there is an offset to that location from calling function. 0x0000012C is of course 300 in hex, which is what you need to set that address to.

codeproject(dor)com/KB/cs/unmanage(dot)aspx

Gives and example and source code for using C# to process asm from a dll.

I suggest you read Geri's post about asm.

forum.cheatengine(dot)org/viewtopic(dot)php?t=515593
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atom0s
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PostPosted: Sun Aug 15, 2010 10:27 am    Post subject: Reply with quote
flash harry wrote:
Pingo or anyone plz help

i can read/write to static address like this:

Code:
float Val = Mem.ReadFloat(0x345291FC);
            Mem.WriteFloat(0x345291FC, Val = 0.5F);


but what about read/write to a pointer + offsets?

now i have "0x344107DC" and the offset is "18" but i dont know how to write it.


Read the value of the pointer first then add your offset to it and read the needed data then.

flash harry wrote:
before when i was using "ProcessMemoryReaderLib" i would just write it like this:

Code:

preader.ReadProcess = myprocess[0];
            preader.OpenProcess();
           
            int byteswritten;
            int bytesread;
            int value;
            int pointerbase;
            byte[] memory;
           
            memory = preader.ReadProcessMemory((IntPtr)0x344107DC, 4, out bytesread);
            pointerbase = BitConverter.ToInt32(memory, 0);
            pointerbase += 0x18;
            value = 99;
            memory = BitConverter.GetBytes(value);
            preader.WriteProcessMemory((IntPtr)pointerbase, memory, out byteswritten);


but now using this new reader "CSharpProcessMemory" im stuck on how to write to a pointer + offsets.

im totally baffled now ive tried all sorts of combos but to no avail

a quick google for "CSharpProcessMemory" got this
pastebin . com/hyXMyUzz

which seems to be what i am using

any help is very much appreicated


Looking that the class you are using, firstly I would suggest writing your own as the way that one is setup is not needed in .NET and can be done with few functions.

But if you plan to keep using it you could do something like this:

Code:
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;
uint uiVal = mem.ReadUInt(Convert.ToInt32(uiPtr));

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flash harry
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PostPosted: Mon Aug 16, 2010 10:13 am    Post subject: Reply with quote
Thanks Wiccaan,

so if this is to read the pointer:
Quote:
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;
uint uiVal = mem.ReadUInt(Convert.ToInt32(uiPtr));


how would i write a new value to that pointer?
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atom0s
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PostPosted: Mon Aug 16, 2010 10:40 am    Post subject: Reply with quote
Using that class: (UInt value as example.)

Code:

// Obtain pointer value.
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;
uint uiVal = mem.ReadUInt(Convert.ToInt32(uiPtr));

// Adjust and rewrite value.
uiVal -= 0x100;
mem.WriteUInt( uiPtr, uiVal );

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flash harry
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PostPosted: Tue Aug 17, 2010 9:06 am    Post subject: Reply with quote
Wiccaan wrote:
Using that class: (UInt value as example.)

Code:

// Obtain pointer value.
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;
uint uiVal = mem.ReadUInt(Convert.ToInt32(uiPtr));

// Adjust and rewrite value.
uiVal -= 0x100;
mem.WriteUInt( uiPtr, uiVal );


i gave this a try but im getting 2 error's

1. (The best overloaded method match for 'CSharpProcessMemory.ProcessMemory.WriteUInt(int, uint)' has some invalid arguments)

2. (Argument 1: cannot convert from 'uint' to 'int')

Sorry for being a pain but could you provide a "Float" example please if its not to much trouble.

Thanks in advance.
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atom0s
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PostPosted: Tue Aug 17, 2010 9:48 am    Post subject: Reply with quote
Code:
// Obtain pointer.
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;

// Obtain value.
float fValue = ReadFloat(Convert.ToInt32(uiPtr));
fValue -= 100.0f; // subtract 100

// Write new value back.
WriteFloat(Convert.ToInt32(uiPtr), fValue);


Should work, could be off though since I don't do things like this.
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flash harry
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PostPosted: Tue Aug 17, 2010 2:58 pm    Post subject: Reply with quote
Wiccaan wrote:
Code:
// Obtain pointer.
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;

// Obtain value.
float fValue = ReadFloat(Convert.ToInt32(uiPtr));
fValue -= 100.0f; // subtract 100

// Write new value back.
WriteFloat(Convert.ToInt32(uiPtr), fValue);


Should work, could be off though since I don't do things like this.


Thanks very much its all working now


Using this:
Code:

            ProcessMemory mem = new ProcessMemory("Process Name");
            uint uiPtr = Mem.ReadUInt(0x344107E0);
            uiPtr += 0x5C;
            float Val = Mem.ReadFloat(Convert.ToInt32(uiPtr));
            Val = 60000;
            Mem.WriteFloat(Convert.ToInt32(uiPtr), Val);



Big thanks to Pingo and Wiccaan for helping me on this
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flash harry
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PostPosted: Thu Aug 19, 2010 1:58 pm    Post subject: Reply with quote
Having probs with hotkeys for pointers now Sad

My hotkey for static address like this:
Code:

            float Val = Mem.ReadFloat(0x345291FC);
            if (Mem.Keystate(Keys.F1))
            Mem.WriteFloat(0x345291FC, Val = -5F);


but i cant do the same with pointer Confused

i need to make this:
Code:

            if (Mem.Keystate(Keys.F6))

work with this:
Code:

            ProcessMemory mem = new ProcessMemory("Process Name");
            uint uiPtr = Mem.ReadUInt(0x344107E0);
            uiPtr += 0x5C;
            float Val = Mem.ReadFloat(Convert.ToInt32(uiPtr));
            Val = 60000;
            Mem.WriteFloat(Convert.ToInt32(uiPtr), Val);


i was hoping to just do this:
Code:

            if (Mem.Keystate(Keys.F6))
            ProcessMemory mem = new ProcessMemory("Process Name");
            uint uiPtr = Mem.ReadUInt(0x344107E0);
            uiPtr += 0x5C;
            float Val = Mem.ReadFloat(Convert.ToInt32(uiPtr));
            Val = 60000;
            Mem.WriteFloat(Convert.ToInt32(uiPtr), Val);


but im getting 2 errors:

1. A local variable named 'Val' is already defined in this scope.

2. Embedded statement cannot be a declaration or labeled statement.


so the problem i have now is i can use hotkeys on static address but not on pointers Confused

Any help is much appriciated.

--------------------------------------------------------------------

*EDIT* Nevermind i fixed it.... i forgot the brackets doh Very Happy

Code:

            if (Mem.Keystate(Keys.F6))
            {
                ProcessMemory mem = new ProcessMemory("Process Name");
                uint uiPtr = Mem.ReadUInt(0x344107E0);
                uiPtr += 0x5C;
                Mem.ReadFloat(Convert.ToInt32(uiPtr));
                Val = 60000;
                Mem.WriteFloat(Convert.ToInt32(uiPtr), Val);

            }


Silly me Very Happy
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Pingo
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PostPosted: Tue Aug 24, 2010 2:20 am    Post subject: Reply with quote
[quote="flash harry"]Thanks Wiccaan,

so if this is to read the pointer:
Quote:
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;
uint uiVal = mem.ReadUInt(Convert.ToInt32(uiPtr));


app reads the .exe/.dll module for pointers
say the game module is 400000
344107DC - 400000 = 340107DC
read/write pointers
Mem.ReadUInt(Mem.Pointer(true, 0x340107DC, 0x18));
Mem.WriteUInt(Mem.Pointer(true, 0x340107DC, 0x18), Value);// change Value for the actual value you wanna write.
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flash harry
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PostPosted: Tue Aug 24, 2010 3:07 pm    Post subject: Reply with quote
Thanks pingo thats easier,

ive also got another prob tho m8, i done a toggle on/off with hotkey and the first one worked fine but if i add another it wont work Sad

i know it is to do with the Mybool thing but im unsure as what to do with it, i know i need to change Mybool[0] to Mybool[1] but im not having any joy, ive tried allsorts but none seem to work so i must be doing it wrong.

big thanks for your help and time m8.
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Pingo
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PostPosted: Thu Aug 26, 2010 5:04 pm    Post subject: Reply with quote
I pmed you the source again. It'l show 3 examples using 3 different bools.
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Pingo
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PostPosted: Fri Aug 27, 2010 6:17 am    Post subject: Reply with quote
Sorry dude you'l need to redownload it again. It had an error Embarassed
Just use the same link
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PostPosted: Fri Aug 27, 2010 5:17 pm    Post subject: Reply with quote
[quote="Pingo"]
flash harry wrote:
Thanks Wiccaan,

so if this is to read the pointer:
Quote:
ProcessMemory mem = new ProcessMemory("proc_name.exe");
uint uiPtr = mem.ReadUInt(0x344107DC);
uiPtr += 0x80;
uint uiVal = mem.ReadUInt(Convert.ToInt32(uiPtr));


app reads the .exe/.dll module for pointers
say the game module is 400000
344107DC - 400000 = 340107DC
read/write pointers
Mem.ReadUInt(Mem.Pointer(true, 0x340107DC, 0x18));
Mem.WriteUInt(Mem.Pointer(true, 0x340107DC, 0x18), Value);// change Value for the actual value you wanna write.


You should avoid embedding calls like this unless your functions specifically look for erroneous returns or you will get exceptions and issues, not to mention possible invalid reads/writes to locations of memory.
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