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C++ ReadProcessMemory (Memory Access Violation)

 
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Tobilo
How do I cheat?
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Joined: 19 Jan 2018
Posts: 7

PostPosted: Mon Feb 19, 2018 5:58 am    Post subject: C++ ReadProcessMemory (Memory Access Violation) Reply with quote

Code:

DWORD read;
MEMORY_BASIC_INFORMATION mbi;

char* chunk = 0;


if (!VirtualQueryEx(readhandle, chunk, &mbi, sizeof(mbi))) {
            return GetLastError();
}

char buffer[mbi.RegionSize];

ReadProcessMemory(readhandle, mbi.BaseAddress, &buffer, mbi.RegionSize, &read);


I have a problem, because the Memory Region (Size:7864320) I want to read is actually resulting in a memory access violation, since the array is too big. Is there a way to avoid that?
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Dark Byte
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Location: The netherlands

PostPosted: Mon Feb 19, 2018 6:37 am    Post subject: Reply with quote

instead of &buffer give buffer, else you're giving the address of the buffer pointer in the stack

(Also, instead of allocating buffer in the stack, you may wish to allocate it separately. The stack might be big enough)

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Tobilo
How do I cheat?
Reputation: 0

Joined: 19 Jan 2018
Posts: 7

PostPosted: Mon Feb 19, 2018 9:32 am    Post subject: Reply with quote

Dark Byte wrote:
instead of &buffer give buffer, else you're giving the address of the buffer pointer in the stack

(Also, instead of allocating buffer in the stack, you may wish to allocate it separately. The stack might be big enough)


Thank you, I am relatively new to c++, by allocating the buffer separately and by giving the buffer directly it worked. But the main problem was that I did not wrote
Code:
 char *buffer = new char[mbi.RegionSize];
since this statement was in a loop...
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