process memory scanner

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Hi I've been trying to read a process (e.g calculator) memory, and every thing seems ok on the code, but MemoryRegion is always same in the loop!! and

mem_info.State == MEM_COMMIT

will never be true!
I thing there is some thing wrong with 32 and 64bit OS.
I'm running on 64Bit win.

code:

HWND hwin = FindWindow(0,"calculator");
cout<<hwin<<endl;

unsigned long procId;
GetWindowThreadProcessId(hwin, &procId);

HANDLE proc = OpenProcess(PROCESS_ALL_ACCESS,0,procId);

cout<<proc<<endl;

SYSTEM_INFO sys_info;
GetSystemInfo(&sys_info);
long min_address = (long)sys_info.lpMinimumApplicationAddress;
long max_address = (long)sys_info.lpMaximumApplicationAddress;


MEMORY_BASIC_INFORMATION mem_info;

while(min_address < max_address)
{
    VirtualQueryEx(proc, &min_address, &mem_info, sizeof(mem_info));

    if (mem_info.State == MEM_COMMIT)
    {
        cout<<mem_info.RegionSize<<endl;
    }
    min_address = min_address + mem_info.RegionSize;
}

Any help will be appreciated

Posted 5-Jun-14 6:56am

mehdi_k

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[no name] 5-Jun-14 22:38pm

Is it working in 32-bit?

mehdi_k 8-Jun-14 3:27am

I haven't tested it myself, but on the web, it seems to work.

Stefan_Lang 6-Jun-14 2:34am

This is just a wild guess, but have you tried MEMORY_BASIC_INFORMATION64 ? See at the bottom of this site for more info: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366775%28v=vs.85%29.aspx

mehdi_k 8-Jun-14 3:31am

I think the link is dead.
yes I have tried to use MEMORY_BASIC_INFORMATION64, but the VirtualQueryEx only accepts MEMORY_BASIC_INFORMATION !

update
Your link is ok

Rage 18-Jun-14 5:13am

What size is the VirtualQueryEx returning (as a return value) ?
Do you have a GetLastError value ?

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bling · Answer 1 · 2014-06-24T11:41:00

Your call to VirtualQueryEx looks wrong. Following Rage's advise would help you. Try this:

C++

BOOL bOK = VirtualQueryEx(proc, min_address, &mem_info, sizeof mem_info);
if (!bOK)
{
    DWORD dwErr = GetLastError();
    std::cout << "VirtualQueryEx returns " << dwErr << std::endl;
}

You may need to truncate the min_address to a page boundary. See:

http://msdn.microsoft.com/en-us/library/windows/desktop/aa366907%28v=vs.85%29.aspx[^]