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[SOLVED] [C++] WriteProcessMemory Error 998 (ERROR_NOACCESS)

 
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Pasukaru
How do I cheat?
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Joined: 15 Dec 2011
Posts: 8

PostPosted: Sat Dec 17, 2011 7:42 pm    Post subject: [SOLVED] [C++] WriteProcessMemory Error 998 (ERROR_NOACCESS) Reply with quote

Hello again!

Now that I managed to successfully read and write memory with static pointers, I'm trying to go one step further and change Opcode.

I currently try this:
Code:
   HANDLE handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pID);
   //NOP32 is defined as 0x90909090   
   printf("Writing 0x%08x to 0x%08X\n", NOP32, ammoAddress);
   BOOL success = WriteProcessMemory(handle, (LPVOID)ammoAddress, (LPCVOID)NOP32, 4, NULL);
   if( !success )
      cout << "Error: " << GetLastError() << endl;
It always results in error #998(ERROR_NOACCESS).

However, if I add 'ammoAddress' in CheatEngine as 4 Byte and change it to 0x90909090 it works without problems.

#Edit
I also tried do add this:
Code:
VirtualProtectEx(handle, (LPVOID)ammoAddress, 4, PAGE_EXECUTE_READWRITE, NULL);
But it results in a 998 error as well.
#/Edit

What do I have to change to make this work?

Thanks in advance. Smile

#EDIT
Fixed it.
The error code was replaced with #299(ERROR_PARTIAL_COPY) at some point... I'm not sure why. But at least I knew how to fix this one.

I had to change this:
Code:
   DWORD nop32 = NOP32;
   BOOL success = WriteProcessMemory(handle, (LPVOID)ammoAddress, (LPCVOID)&nop32, 4, NULL);


Last edited by Pasukaru on Sat Dec 17, 2011 11:33 pm; edited 1 time in total
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rooski
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Joined: 31 Oct 2007
Posts: 340
Location: Siberia

PostPosted: Sat Dec 17, 2011 11:25 pm    Post subject: Reply with quote

Its been a while , but this is from an old project i pulled up.

Code:
hWindow = FindWindow(NULL, L"Plants vs. Zombies");

if (hWindow) {
cout<<"window found"<<endl;
GetWindowThreadProcessId(hWindow, &pid);
}

hProcess = OpenProcess(PROCESS_VM_READ | PROCESS_VM_WRITE | PROCESS_VM_OPERATION | PROCESS_QUERY_INFORMATION, 0, pid);
VirtualProtectEx(hProcess,(LPVOID)address,256,PAGE_EXECUTE_READWRITE, NULL);

ReadProcessMemory(hProcess,(LPCVOID)address,&valueAtAddress,sizeof(valueAtAddress),NULL);
cout << "the current sunpoint value is " << valueAtAddress << endl;
DWORD value = valueAtAddress + 500;
WriteProcessMemory(hProcess,(LPVOID)address,&value,sizeof(value),NULL);
CloseHandle(hProcess);

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Pasukaru
How do I cheat?
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Joined: 15 Dec 2011
Posts: 8

PostPosted: Sat Dec 17, 2011 11:35 pm    Post subject: Reply with quote

I just found out what my problem was. (I didn't use a pointer in WriteProcessMemory)

Thanks anyways. Smile
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ViZZion
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Joined: 17 Apr 2004
Posts: 316

PostPosted: Wed Dec 21, 2011 10:33 am    Post subject: Reply with quote

Just fyi

I also tried do add this: Code:
VirtualProtectEx(handle, (LPVOID)ammoAddress, 4, PAGE_EXECUTE_READWRITE, NULL);

But it results in a 998 error as well.
#/Edit

This is because you are putting the last param as NULL, the old access parameters variable and it fails.

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