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homer_simpson
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Posts: 596
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 Posted: Thu Jul 10, 2008 7:53 am Post subject: [c++] Dll help |
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Im making a C++ dll for maplestory heres a chunk of the source:
| Code: | void MainThread()
{
Sleep(2500); //give time for maple to start
BypassCRC();
}
void BypassCRC()
{
FixMemEx(GetCurrentProcess(), (void*)CRCaddy, 0x1000, PAGE_EXECUTE_READWRITE, (DWORD*)oldprot);
CRC = VirtualAlloc(NULL, 0x00400000, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
memcpy((void *)MEMDUMP, (void *)0x00400000, 0x00400000);
memcpy((void *)CRC, (void *)MEMDUMP, 0x00400000);
CRCaddy = 0x0047cc9e;
*(BYTE*)CRCaddy = 0xE8;
*(DWORD*)((unsigned long)CRCaddy + 1) = JMP(CRCaddy, CRCCave);
OutputDebugString("Bypassed CRC!");
} |
But my bulder keeps telling me this:
| Code: | | [C++ Error] dll.cpp(54): E2268 Call to undefined funcion 'BypassCRC' |
What am I doing wrong?
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atom0s
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| Posted: Thu Jul 10, 2008 7:57 am Post subject: |
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Either create a function prototype for BypassCRC at the top of the file, or put the BypassCRC function above the MainThread function.
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homer_simpson
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Posts: 596
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| Posted: Thu Jul 10, 2008 8:27 am Post subject: |
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Thanks it worked but now it gives me this error:
| Code: | | [C++ Error] dll.cpp(36): E2448 Undefined label 'VPX' |
And this is the code:
| Code: | #include <windows.h>
#pragma hdrstop
#include "Unit2.h"
#pragma link "Unit2"
#pragma argsused
#define JMP(frm, to) (int)(((int)to - (int)frm) - 5);
HINSTANCE hMod;
LPVOID CRC;
DWORD oldp = 0;
PDWORD oldprot = &oldp;
BYTE MEMDUMP[0x400000];
DWORD Addy = 0x00400000, CRCaddy, ReturnMe;
static const FARPROC VPX = (FARPROC)((DWORD)GetProcAddress(GetModuleHandleA("kernel32.dll"), "VirtualProtectEx")+5);
WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
Application->Initialize();
Application->CreateForm(__classid(TForm2), &Form2);
Application->Run();
OutputDebugString("HomerTrainer activated ;)");
return 0;
}
__declspec(naked) BOOL WINAPI FixMemEx(HANDLE hProcess, LPVOID lpAddress, SIZE_T dwSize, DWORD flNewProtect, PDWORD lpflOldProtect)
{
_asm
{
mov edi,edi
push ebp
mov ebp,esp
jmp VPX
}
return 0;
}
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Guessing jmp VPX is the problem because VPX isn't properly defined?
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Zand
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| Posted: Thu Jul 10, 2008 8:30 am Post subject: |
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| get rid of all the FARPROC crap and declare it as a DWORD.
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homer_simpson
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| Posted: Thu Jul 10, 2008 8:36 am Post subject: |
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You mean like this?
| Code: | | static const DWORD VPX = ((DWORD)GetProcAddress(GetModuleHandleA("kernel32.dll"), "VirtualProtectEx")+5); |
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Zand
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| Posted: Thu Jul 10, 2008 8:41 am Post subject: |
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| That should probably work.
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homer_simpson
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| Posted: Thu Jul 10, 2008 8:56 am Post subject: |
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| Still the same error.
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oib111
I post too much
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Posts: 2947
Location: you wanna know why?
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| Posted: Thu Jul 10, 2008 9:02 am Post subject: |
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Just do this.
| Code: |
DWORD VPX = (DWORD)GetProcAddress(LoadLibrary("KERNEL32.DLL"), "VirtualProtectEx")+5;
__declspec(naked) BOOL WINAPI FixMemEx(HANDLE hProcess, LPVOID lpAddress, SIZE_T dwSize, DWORD flNewProtect, PDWORD lpflOldProtect)
{
_asm
{
mov edi,edi
push ebp
mov ebp,esp
jmp[VPX]
}
}
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cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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homer_simpson
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| Posted: Thu Jul 10, 2008 9:08 am Post subject: |
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Worked but now it gives me this:
| Code: | [C++ Error] dll.cpp(36): E2448 Undefined label '['
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And I had to add return 0;
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oib111
I post too much
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| Posted: Thu Jul 10, 2008 9:15 am Post subject: |
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Don't add return 0. And what compiler are you using? I'm assuming VC++ because you're using forms. Well if it doesn't recognize [ then just do "jmp VPX".
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| 8D wrote: |
cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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GMZorita
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| Posted: Thu Jul 10, 2008 9:16 am Post subject: |
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WOW How surprising, you are using my leaked code, just changed some vars so it doesn't looks exactly the same.
Instead of
Just use
| oib111 wrote: | | Don't add return 0. And what compiler are you using? I'm assuming VC++ because you're using forms. Well if it doesn't recognize [ then just do "jmp VPX". |
No he is using Borland Developer Studio w/ my Leaked Trainer Source,
But he changed some vars so he get those problems.
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homer_simpson
Grandmaster Cheater
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Posts: 596
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| Posted: Thu Jul 10, 2008 9:22 am Post subject: |
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| GMZorita wrote: | WOW How surprising, you are using my leaked code, just changed some vars so it doesn't looks exactly the same.
Instead of
Just use
| oib111 wrote: | | Don't add return 0. And what compiler are you using? I'm assuming VC++ because you're using forms. Well if it doesn't recognize [ then just do "jmp VPX". |
No he is using Borland Developer Studio w/ my Leaked Trainer Source,
But he changed some vars so he get those problems. |
Well at least im learning... And that gave be back to the VPX label error.
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atom0s
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| Posted: Thu Jul 10, 2008 12:09 pm Post subject: |
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Be sure you are defining things ABOVE what is calling them. Or you will get undefined errors like the one you are getting.
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GMZorita
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Posts: 1361
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| Posted: Thu Jul 10, 2008 12:11 pm Post subject: |
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| homer_simpson wrote: | | GMZorita wrote: | WOW How surprising, you are using my leaked code, just changed some vars so it doesn't looks exactly the same.
Instead of
Just use
| oib111 wrote: | | Don't add return 0. And what compiler are you using? I'm assuming VC++ because you're using forms. Well if it doesn't recognize [ then just do "jmp VPX". |
No he is using Borland Developer Studio w/ my Leaked Trainer Source,
But he changed some vars so he get those problems. |
Well at least im learning... And that gave be back to the VPX label error. |
For god sake just use this code.
| Code: |
static const FARPROC VPX = (FARPROC)((DWORD)GetProcAddress(GetModuleHandleA("kernel32.dll"), "VirtualProtectEx")+5);
DWORD oldp2 = 0;
PDWORD oldprot2 = &oldp2;
_declspec(naked) BOOL WINAPI FixMemEx(HANDLE hProcess, LPVOID lpAddress, SIZE_T dwSize, DWORD flNewProtect, PDWORD lpflOldProtect)
{
_asm
{
mov edi,edi
push ebp
mov ebp,esp
jmp VPX
}
return 0;
}
//---------------------------------
void FixMem()
{
FixMemEx(GetCurrentProcess(), (void*)0x400000, 0x400000, PAGE_EXECUTE_READWRITE, (DWORD*)oldprot2);
} |
When you need to fix the memory just use
And no you are not learning you are mostly leeching.
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Noz3001
I'm a spammer
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Location: /dev/null
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| Posted: Thu Jul 10, 2008 12:38 pm Post subject: |
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| Why not make FixMemEx void?
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