VERY HARD Pointer Question

[deoblo1]

Ok I want to know how to get data at an addresss, or i dont know the address in memory but i know where it starts and i am looking for a value. I am looking for something that starts at ffff:0000 How can i scan the data starting at this address.
EX
go to msdos and type debug then type d ffff:0000 and press enter

I want to be able to look at any memory address on my computer

[Zaei]

BYTE* p = 0xffff0000;
cout << *p << endl;

Be careful of where you use that, Im not sure if you will get access violations if you try to dereference memory outside of your process.

Z.

[deoblo1]

ok im useing Turbo C++ for dos so I dont have the byte variable type. So i set it as an unsigned long

EX

unsigned long *moo = 0xffff0000;
cout << *moo << endl;

and i get an error, saying i can not convert unsigned long to unsigned long * any ideas?

[linolium]

Maybe you need to #include something to get the BYTE data type? check out MSDN

[deoblo1]

I am useing a c++ for DOS a compiler that was written back in 1990...so dont think MSDN will know what i am talking about i am not useing Visual C++.

[Zaei]

Change BYTE to char. You will also have to worry about far pointers. Your compiler should have come with help files, and you should do a bit of searching on the net for 16 bit pointers (my code uses 32 bit pointers).

Z.

[parksie]

If you're running any program under Windows you won't have access to memory outside of your program (DOS ones can sometimes get away with it for certain addresses).

The best thing is to write a virtual device driver (vxd) which can access any 32-bit memory address at will

[Zaei]

There might be Win32API functions to read and write memory at any location, but Im not sure (i think i remember something like this). Take a look around the MSDN.

Z.