C++ ReadProcessMemory issue - help

[vaflata]

Hi guys,
I'm trying to read some values off the d3 process. I've located the base address of the game via the getBaseAddress function. The problem is that I'm not reading any data, value stays a constant, and data read = 0. It doesn't matter what offset I give to the baseAddr. Thank you in advance!

 ...
                        cout << "Handle success...\n";
		 	DWORD baseAddr = getBaseAddress(processId, _T("Diablo III"));

			printf("Base Address: 0x%p\n", baseAddr); 
			
			float hp = 0;

			//void* value; // pointer to the current location
			DWORD value;

			unsigned int count = 4096;
			SIZE_T read = 0;

			DWORD baseAddrOffset = baseAddr + 4;

			ReadProcessMemory(hProcessHandle, (LPCVOID)(baseAddrOffset), &value, count, &read);
			

			printf("Memory Address: 0x%p\n", baseAddrOffset);
			cout << "Value: " << value << endl;
			cout << "Read: " << read << endl;

[KillerJohn]

be sure you are running your VS and/or your project as administrator.

[enigma32]

You get an error?

"If the function succeeds, the return value is nonzero.
If the function fails, the return value is 0 (zero). To get extended error information, call GetLastError.
The function fails if the requested read operation crosses into an area of the process that is inaccessible."

[vaflata]

Yes, I just tried running as administrator, same thing. I took enigma's advice and checked the returned value of ReadProcessMemory. Output:
Handle success...
8388608
GetLastError returned 3e6


I tried to see what does the error message means and it turns out this:
ERROR_NOACCESS
998 (0x3E6)
Invalid access to memory location.

hProcessHandle = OpenProcess(PROCESS_VM_READ , FALSE, processId);

is what I'm doing. Should I not set the process access to VM_READ ? :confused:

Well, I figured it out. I took the base address and tried it in a new project and I successfully read the memory of this process. Seems I've had a bad handle to the process or something.