修改器游戏内存修改器原理

游戏内存修改器原理

#include "stdafx.h"

#include <windows.h>

#include <tchar.h>

DWORD g_arList[1024] ;int g_nListCnt;

HANDLE g_hProcess;

BOOL Wr iteMemory(DWORD dwAddr, DWORD dwValue) ;void ShowList(void) ;

BOOL CompareAPage(DWORD dwBaseAddr, DWORD dwValue) ;BOOL FindNext(DWORD dwValue) ;

BOOL FindFirst(DWORD dwValue) ;

BOOL FindFirst(DWORD dwValue)

{const DWORD dwOneGB = 1024 * 1024 * 1024;const DWORD dwOnePage = 4 * 1024;if (NULL == g_hProcess)

{return FALSE;

}

DWORD dwBase;

OSVERSIONINFO vi = {si zeof(vi) } ;

: :GetVersionEx(&vi) ;i f (VER_PLATFORM_WIN32_WINDOWS == vi.dwPlatformI d){dwBase = 4 * 1024 * 1024;

}else

{dwBase = 640 * 1024;

}

f or (; dwB as e < 2 * dwOne GB; dwBas e += dwOneP age)

{

CompareAPage(dwBase, dwVa lue) ;

}return TRUE;

}

BOOL CompareAPage(DWORD dwBaseAddr, DWORD dwValue)

{

BYTE arBytes[4096] ;if ( ! : :ReadProcessMemory(g_hProcess, (LPVOID)dwBaseAddr,arBytes, 4096, NULL))

{return FALSE;

}

DWORD* p dw = NUL L;int i = 0;for (i = 0; i < (int)4 * 1024 -3; i++)

{p dw = (DWO RD*)&arBy t e s[i] ;i f (pdw[0] == dwVal ue)

{if (g_nListCnt >= 1024)

{return FALSE;

}g_arList[g_nListCnt++] = dwBaseAddr + i ;

}

}return TRUE;

}void ShowList(void)

{int i;for (i = 0; i < g_nListCnt; i++)

{printf("%08lX/n", g_arList[i]) ;

}

}

BOOL FindNext(DWORD dwValue)

{int nOrgCnt = g_nListCnt;g_nListCnt = 0;

BOOL bRet = FALSE;

DWORD dwReadValue;int i;f or (i = 0; i < nOrgCnt; i++)

{if ( : :ReadProcessMemory(g_hProcess,

(LPVOID)g_arL i st[i] , &dwReadVal ue, s i ze of(DWORD) , NULL))

{i f (dwReadVal ue == dwValue)

{g_arList[g_nListCnt++] = g_arLi st[i] ;bRet = TRUE;

}

}

}return bRet;

}

BOOL Wr iteMemory(DWORD dwAddr, DWORD dwValue)

{return : :WriteProcessMemory(g_hProcess, (LPVOID)dwAddr,

&dwValue, s i z eof(DWORD) , NULL) ;

}int main(int argc, char* argv[] )

{

TCHAR szFileName[] =_T(". ./Debug/Testor0. exe") ;

STARTUPINFO s i = {s izeof(si) } ;

PROCESS_INFORMAT ION pi ;

: :CreateProcess(NULL, szFileName, NULL, NULL, FALSE,C REATE_NEW_CONSOLE, NULL, NULL, &s i, π) ;

: :CloseHandle(pi.hThread) ;g_hProcess = pi.hProcess;int iVal;printf("Input val = ") ;scanf("%d", &iVal) ;

FindFirst(iVal) ;

ShowLi s t() ;if (g_nListCnt > 1)

{printf("Input val = ") ;scanf("%d", &iVal) ;

FindNext(iVal) ;

ShowLi s t() ;

}printf("New value = ") ;scanf("%d", &iVal) ;if (WriteMemory(g_arLi st[0], iVal) )

{printf("Write data success./n") ;

}

: :Cl oseHandle(g_hProce ss) ;return 0;

}