related to c programming

Question

1.00/5 (2 votes)

See more:

C++

C

dereferencing a void pointer to a memory mapped address space of a HW device leads to what result?

Posted 7-Nov-14 0:29am

Member 11214662

Add a Solution

Comments

Richard MacCutchan 7-Nov-14 6:46am

Try it and see.

Emre Ataseven 7-Nov-14 7:28am

The compiler will not let you dereference a void* pointer because it does not know the size of the object pointed to, you need to typecast your pointer to the right type before you dereference it.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

den2k88 · Answer 1 · 2014-11-07T01:34:00

First and foremost, as Emre Ataseven answered, no compiler can dereference a void* pointer wothout a cast.

For your question it really depends on the architecture but in the general case the OS won't allow you taht because Memory Mapped addresses are right under the protective wing of the kernel - you need to use APIs to access to that locations. Normally you cannot dereference any memory location that isn't within your process memory.

Of course if you are working in kernel mode or in a microcontroller things are different, as any address is accessible.