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Making a pointer point to a specific address?

For Beginners

Started by robertgamble October 18, 2002 08:33 AM

3 comments, last by robertgamble 21 years, 5 months ago

robertgamble

122

Author

October 18, 2002 08:33 AM

How would I make a pointer point to a specific memory address? Say I have an integer "int *i" and when I assign a value to i it updates my memory address.. So instead of:- (int)(*0x5000)=new_value; I can do:- i=new_value; ..to write to 0x5000, Thanks.

felonius

122

October 18, 2002 08:52 AM

To make a pointer point to 0x5000 write this:

int* i = (int*)0x5000;

and now you can write:

*i = new_value;

to change the contents of adress 0x5000;

And thats it.

Jacob Marner, M.Sc.
Console Programmer, Deadline Games

Jacob Marner, M.Sc.Console Programmer, Deadline Games

SabreMan

504

October 18, 2002 08:53 AM

This sounds like you''re doing something a bit dodgy, but still...

int *pi = reinterpret_cast(0x5000);

Hamlet

122

October 18, 2002 04:27 PM

Do both of those cases work?

1. (int)(*0x5000)=new_value;

and

2.int *pi = reinterpret_cast(0x5000);

And could you tell me where the function "reinterpret_cast()"
comes from?

Thanks mates.

"... thats the rub...

mickey

100

October 18, 2002 09:34 PM

hi, reinterpret_cast is a new keyword invented for c++ to get away from the old way of casting. There are four of them,