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Cheat Engine
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Dark Byte
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Joined: 09 May 2003
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Location: The netherlands
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 Posted: Tue Feb 28, 2012 1:47 pm Post subject: |
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Are you looking for module data or allocated data?
If moduledata the the easiest is CreateToolhelp32Snapshot and module32first/module32next (search msdn)
If allocated data look into virtualquery
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Shalvaid95
How do I cheat?
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Joined: 26 Feb 2012
Posts: 9
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| Posted: Tue Feb 28, 2012 2:14 pm Post subject: |
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I'm not completely sure about the differences between each one, but I think is the module data. Now I'm reading in msdn the api calls you told me.
For example, cheat engine starts always searching from x00000000? Or does it start from the base address of the process selected to make it faster?
I would like to do something like that, to improve the performance.
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Dark Byte
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Joined: 09 May 2003
Posts: 25979
Location: The netherlands
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| Posted: Tue Feb 28, 2012 4:25 pm Post subject: |
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Cheat Engine starts from 00000000, but it uses VirtualQueryEx to pinpoint memory regions that are unreadable and skip that
The main tip for performance is to never do RPM calls smaller than 4KB. Read first, scan later
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Shalvaid95
How do I cheat?
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Joined: 26 Feb 2012
Posts: 9
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| Posted: Tue Feb 28, 2012 5:43 pm Post subject: |
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Well, you were right Dark Byte. Thank you so much... I know i suck
My loop took 5 or more minutes, now is taking seconds !!!!
I did something like you told me:
| Code: | //////////////////////////////////////////////////////////////////
// ReadString from a certain Address and return as string type (4kb)
//////////////////////////////////////////////////////////////////
std::string ReadString(int Point)
{
//char *value = (char*)malloc(Len+1) = {0};
char value[4097] = {0}; //1KB (1024 BYTES) * 4 = 4KB (4096)
SIZE_T numBytesRead;
if (ReadProcessMemory(hProcess, (LPVOID)Point, value, 4096, &numBytesRead) == 0)
{
DWORD lastError = GetLastError();
return "";
// error - return an empty string
}
return std::string(value, numBytesRead);
}
//////////////////////////////////////////////////////////////////
// Search a Certain String in a process
//////////////////////////////////////////////////////////////////
int _stdcall SearchString(char *Text)
{
size_t found;
std::string Find;
long int x;
Find = std::string(Text,7);
// 80000000 / 4096 = 19532,...
for(x = 0; x < 19532; x++)
{
found=ReadString(x * 4096).find(Find);
if (found!=std::string::npos )
{
return (x * 4096) + found; // Return the address we found
}
}
return 0; //Error Return zero
} |
What happens if my string gets in the middle of a search ? Hahaha I hope it never happens. Anyway is FAAASTEER !!! than my last code.
How I can search and do the same for int (4bytes) values (to search pointers). And also find and verify if it's the value which i'm looking for.
I guess in arrays, but i'm not sure.
Thank you booss!
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atom0s
Moderator
 Reputation: 205
Joined: 25 Jan 2006
Posts: 8588
Location: 127.0.0.1
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| Posted: Tue Feb 28, 2012 9:14 pm Post subject: |
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Here's an example using Unicode strings since its the only thing on my laptop I could think to use to test this with lol:
| Code: |
#include <Windows.h>
#include <iostream>
#include <string>
DWORD_PTR _scan_string( HANDLE hProcHandle, const wchar_t* pwszInput )
{
if (hProcHandle == INVALID_HANDLE_VALUE)
return -1;
MEMORY_BASIC_INFORMATION mbi = { 0 };
LPVOID lpStartAddress = NULL;
SYSTEM_INFO sysInfo = { 0 };
GetSystemInfo( &sysInfo );
lpStartAddress = sysInfo.lpMinimumApplicationAddress;
while( VirtualQueryEx( hProcHandle, lpStartAddress, &mbi, sizeof( mbi ) ) )
{
if ((mbi.State & MEM_COMMIT) && (mbi.Protect & ( PAGE_READWRITE | PAGE_WRITECOPY | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY )))
{
std::cout << "region: " << std::hex << mbi.BaseAddress << std::endl;
unsigned char szBuffer[ 4096 ] = { 0 };
ReadProcessMemory( hProcHandle, mbi.BaseAddress, &szBuffer, 4096, NULL );
for( int x = 0; x < 4096; x++ )
{
if (memcmp( (LPVOID)&szBuffer[ x ], pwszInput, wcslen( pwszInput ) ) == 0)
return ( ( DWORD_PTR )mbi.BaseAddress + x );
}
}
lpStartAddress = ( LPVOID )( ( DWORD_PTR )( lpStartAddress ) + mbi.RegionSize );
}
return 0;
}
int __cdecl main( int argc, TCHAR* argv[] )
{
HWND hWndWindow = FindWindow( NULL, L"Minesweeper" );
if (hWndWindow == NULL)
return ERROR_INVALID_HANDLE;
DWORD dwProcessId = 0;
GetWindowThreadProcessId( hWndWindow, &dwProcessId );
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION|PROCESS_VM_OPERATION|PROCESS_VM_READ, FALSE, dwProcessId );
if (hProcess == NULL)
return ERROR_INVALID_HANDLE;
int nTest = _scan_string( hProcess, L"Minesweeper" );
std::cout << "Scan results: " << nTest;
CloseHandle( hProcess );
return ERROR_SUCCESS;
}
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For original Windows XP Minesweeper.
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