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Help with Attaching Code Cheat Engine
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newb09
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PostPosted: Wed Feb 13, 2008 4:04 pm    Post subject: Help with Attaching Code Cheat Engine Reply with quote
Need help with how cheat Engine attaches to a process.

Like for maplestory in example.

maplestory ends up having no process ID so how does Cheat Engine work around that? How does it actually edit the memory if it cant get the process ID from Maple? it doesnt have a proces handle either. Here is what i mean.


I want to know because im trying to convert CE to a different language lol. I just want to figure out how to read a process's memory that has no PID or Process handle. lol.

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PostPosted: Wed Feb 13, 2008 4:58 pm    Post subject: Reply with quote
Simply by finding the ID first and attaching to the process that holds that ID and it bypasses Read/WriteProcessMemory. (not sure what bypasses that)
You can get the window handle even if the process is hidden.
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newb09
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PostPosted: Wed Feb 13, 2008 5:35 pm    Post subject: Reply with quote
Symbol wrote:
Simply by finding the ID first and attaching to the process that holds that ID and it bypasses Read/WriteProcessMemory. (not sure what bypasses that)
You can get the window handle even if the process is hidden.


yes but how do i attach is what im asking im trying to convert to c#. btw if that matters. um. i can bypass read/writeprocessmemory but um. i just need to know how to attach.

so what i get from ur reply is that if i use the same numbers when maplestory starts lets say PID is 0248 and Phandle is 498736 then those can be used and stored as variables to attach?
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PostPosted: Wed Feb 13, 2008 5:56 pm    Post subject: Reply with quote
Yes, you can get the ID at the play screen and the handle at any time (System.Diagnostics.Process.GetProcessById(), User32.dll - FindWindow())

By "attach" do you mean OpenProcess? you don't even have to call OpenProcess, you can use the ProcessHandle to read memory, I just keep the handle in a static variable and then ReadProcessMemory(variable, params...,..,..);
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lurc
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PostPosted: Wed Feb 13, 2008 6:01 pm    Post subject: Reply with quote
Cheat Engine's driver "bypasses" Read/WriteProcessMemory
CE 5.4's source is open, you can go and analyse the source for the driver u want. (written in C)
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newb09
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PostPosted: Wed Feb 13, 2008 6:13 pm    Post subject: Reply with quote
Symbol wrote:
Yes, you can get the ID at the play screen and the handle at any time (System.Diagnostics.Process.GetProcessById(), User32.dll - FindWindow())

By "attach" do you mean OpenProcess? you don't even have to call OpenProcess, you can use the ProcessHandle to read memory, I just keep the handle in a static variable and then ReadProcessMemory(variable, params...,..,..);


i want to write to memory thats why i just want to know what i needed to actually write to the memory.
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PostPosted: Wed Feb 13, 2008 6:16 pm    Post subject: Reply with quote
I never get C++ sources like this, with all the "__whatever" and the "!@#$%^" and other symbols... Rolling Eyes
Thats why I like C#, it makes sence, DllImport and desclps or something like that... Confused
I don't know much C++...

I didn't understand any of it... Confused I guess I should learn some more C++...
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newb09
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PostPosted: Wed Feb 13, 2008 6:27 pm    Post subject: Reply with quote
Symbol wrote:
I never get C++ sources like this, with all the "__whatever" and the "!@#$%^" and other symbols... Rolling Eyes
Thats why I like C#, it makes sence, DllImport and desclps or something like that... Confused
I don't know much C++...


lol ill pm you if i need any help then lol.
i tried writing to memory but it wont work for some reason ill post code i use in a few min.

EDIT: lol im such a noobxor lol. i had to change my code a bit and now its working thank you so much Smile
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lurc
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PostPosted: Wed Feb 13, 2008 7:18 pm    Post subject: Reply with quote
Taken Straight from MSDN

Quote:
WriteProcessMemory Function

Writes data to an area of memory in a specified process. The entire area to be written to must be accessible or the operation fails.


BOOL WINAPI WriteProcessMemory(
__in HANDLE hProcess,
__in LPVOID lpBaseAddress,
__in LPCVOID lpBuffer,
__in SIZE_T nSize,
__out SIZE_T* lpNumberOfBytesWritten
);

Parameters
hProcess
A handle to the process memory to be modified. The handle must have PROCESS_VM_WRITE and PROCESS_VM_OPERATION access to the process.

lpBaseAddress
A pointer to the base address in the specified process to which data is written. Before data transfer occurs, the system verifies that all data in the base address and memory of the specified size is accessible for write access, and if it is not accessible, the function fails.

lpBuffer
A pointer to the buffer that contains data to be written in the address space of the specified process.

nSize
The number of bytes to be written to the specified process.

lpNumberOfBytesWritten
A pointer to a variable that receives the number of bytes transferred into the specified process. This parameter is optional. If lpNumberOfBytesWritten is NULL, the parameter is ignored.


Example:

// Get DWORD pID using ProcessSnapshot or w/e its called, this method kinda sux
HWND hWnd = FindWindow( "MapleStoryClass", NULL );
DWORD pID;
GetWindowTheadProcessId( hWnd, &pID );
HANDLE hProc = OpenProcess( PROCESS_ALL_ACCESS, FALSE, pID );
BYTE bNops[2] = { 0x90, 0x90 };
WriteProcessMemory( hProc, (LPVOID)0x0000151, (LPVOID)bNops, 2, NULL );


Edit:

Found a function made by Wiccaan, just a more efficiant way of finding the pID

Code:
HANDLE hProcessSnap;   // will store a snapshot of all processes
   HANDLE hProcess = NULL;   // we will use this one for the WarRock process
   PROCESSENTRY32 pe32;   // stores basic info of a process, using this one to read the ProcessID from

   hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );   // make process snapshot

   pe32.dwSize = sizeof( PROCESSENTRY32 );      // correct size

   Process32First(hProcessSnap, &pe32);   // read info about the first process into pe32

   do   // loop to find the WarRock process
   {
      if(strcmp(pe32.szExeFile, "MapleStory.exe") == 0)        {
         hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID);   // open it, assigning to the hProcess handle
         break;   // break the loop
      }
   }
   while(Process32Next(hProcessSnap, &pe32));
//Always remember to close the handle when your done with it.
CloseHandle( hProcess );

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newb09
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PostPosted: Wed Feb 13, 2008 7:47 pm    Post subject: Reply with quote
i still have a question lol.

ok i got the thing to write to an address but once maple starts it doesnt write to it it only writes to the address when it is at startup screen and not ingame even though its the same PID i used for the startup it wont write any suggestions on how to write after maple has started?
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lurc
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PostPosted: Wed Feb 13, 2008 8:12 pm    Post subject: Reply with quote
GameGuard's driver hooks API's that would be a "threat" to MapleStory or API's that have been used in the past to create bots and such.

so you have to create a driver that hooks Read and WriteProcessMemory (like CE does)
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PostPosted: Wed Feb 13, 2008 8:35 pm    Post subject: Reply with quote
oh ok thank you. so i have to make a driver ok i see hm.. time to learn how to write a driver that hooks read and writeprocessmemory. lol wish i could find a tut. lol. thank you for all your help guys
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PostPosted: Wed Feb 13, 2008 8:41 pm    Post subject: Reply with quote
lurc wrote:
Taken Straight from MSDN

Quote:
WriteProcessMemory Function

Writes data to an area of memory in a specified process. The entire area to be written to must be accessible or the operation fails.


BOOL WINAPI WriteProcessMemory(
__in HANDLE hProcess,
__in LPVOID lpBaseAddress,
__in LPCVOID lpBuffer,
__in SIZE_T nSize,
__out SIZE_T* lpNumberOfBytesWritten
);

Parameters
hProcess
A handle to the process memory to be modified. The handle must have PROCESS_VM_WRITE and PROCESS_VM_OPERATION access to the process.

lpBaseAddress
A pointer to the base address in the specified process to which data is written. Before data transfer occurs, the system verifies that all data in the base address and memory of the specified size is accessible for write access, and if it is not accessible, the function fails.

lpBuffer
A pointer to the buffer that contains data to be written in the address space of the specified process.

nSize
The number of bytes to be written to the specified process.

lpNumberOfBytesWritten
A pointer to a variable that receives the number of bytes transferred into the specified process. This parameter is optional. If lpNumberOfBytesWritten is NULL, the parameter is ignored.


Example:

// Get DWORD pID using ProcessSnapshot or w/e its called, this method kinda sux
HWND hWnd = FindWindow( "MapleStoryClass", NULL );
DWORD pID;
GetWindowTheadProcessId( hWnd, &pID );
HANDLE hProc = OpenProcess( PROCESS_ALL_ACCESS, FALSE, pID );
BYTE bNops[2] = { 0x90, 0x90 };
WriteProcessMemory( hProc, (LPVOID)0x0000151, (LPVOID)bNops, 2, NULL );


Edit:

Found a function made by Wiccaan, just a more efficiant way of finding the pID

Code:
HANDLE hProcessSnap;   // will store a snapshot of all processes
   HANDLE hProcess = NULL;   // we will use this one for the WarRock process
   PROCESSENTRY32 pe32;   // stores basic info of a process, using this one to read the ProcessID from

   hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );   // make process snapshot

   pe32.dwSize = sizeof( PROCESSENTRY32 );      // correct size

   Process32First(hProcessSnap, &pe32);   // read info about the first process into pe32

   do   // loop to find the WarRock process
   {
      if(strcmp(pe32.szExeFile, "MapleStory.exe") == 0)        {
         hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID);   // open it, assigning to the hProcess handle
         break;   // break the loop
      }
   }
   while(Process32Next(hProcessSnap, &pe32));
//Always remember to close the handle when your done with it.
CloseHandle( hProcess );



I just saw the basically same code
Code:
   HANDLE hProcessSnap;   // will store a snapshot of all processes
   HANDLE hProcess = NULL;   // we will use this one for the WarRock process
   PROCESSENTRY32 pe32;   // stores basic info of a process, using this one to read the ProcessID from
   
   hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );   // make process snapshot

   pe32.dwSize = sizeof( PROCESSENTRY32 );      // correct size

   Process32First(hProcessSnap, &pe32);   // read info about the first process into pe32

   do   // loop to find the WarRock process
   {      
      if(strcmp(pe32.szExeFile, "WarRock.exe") == 0)   // if WarRock was found
      {
         hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID);   // open it, assigning to the hProcess handle
         break;   // break the loop
      }
   }
   while(Process32Next(hProcessSnap, &pe32));   // loop continued until Process32Next deliver NULL or its interrupted with the "break" above

   CloseHandle( hProcessSnap );   // close the handle (just fuckin do it)


on http://www.mpgh.net/forum/17-tutorials/7511-writing_your_own_c_trainer.html

Why would wiccan make a function with WarRock comments. Just thought i would point this out......Anyone get what i'm saying?
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lurc
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PostPosted: Wed Feb 13, 2008 9:29 pm    Post subject: Reply with quote
iunno if Wiccaan "made" the function, but it was on Extalia, so i just c+p'd ^^
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newb09
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PostPosted: Wed Feb 13, 2008 10:01 pm    Post subject: Reply with quote
lurc wrote:
iunno if Wiccaan "made" the function, but it was on Extalia, so i just c+p'd ^^


lol its fine and thanks for the help.
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