• Bauss (10/10) Jan 13 2015 Is it possible to access a pointer by its offsets.
• Bauss (6/16) Jan 13 2015 Can't seem to edit OP so at:
• Mike Parker (13/34) Jan 13 2015 The forum is a web interface to a newsgroup, which also has a mailing
• ketmar via Digitalmars-d-learn (4/6) Jan 14 2015 yes, it is. it's same as in c/c++, except that you have to add one

"Bauss" <jj_1337 live.dk> writes:

Is it possible to access a pointer by its offsets.
Ex. write a 32bit integer to a byte pointer at ex. offset 4.


fixed (byte* Packet = Buffer) // Buffer would be a byte array

And then to set the value of a specific offset
*((TYPE*)(Packet + OFFSET))

Where TYPE could be replaced by ex. uint and OFFSET by 4

I tried to look here:
http://dlang.org/arrays.html

But couldn't seem to find anything like it.

"Bauss" <jj_1337 live.dk> writes:

On Wednesday, 14 January 2015 at 01:16:54 UTC, Bauss wrote:
 Is it possible to access a pointer by its offsets.
 Ex. write a 32bit integer to a byte pointer at ex. offset 4.


 fixed (byte* Packet = Buffer) // Buffer would be a byte array

 And then to set the value of a specific offset
 *((TYPE*)(Packet + OFFSET))

 Where TYPE could be replaced by ex. uint and OFFSET by 4

 I tried to look here:
 http://dlang.org/arrays.html

 But couldn't seem to find anything like it.

Can't seem to edit OP so at:
*((TYPE*)(Packet + OFFSET))

It should be:
*((TYPE*)(Packet + OFFSET)) = VALUE;

VALUE has to be of the same type as TYPE of course.

Mike Parker <aldacron gmail.com> writes:

On 1/14/2015 10:17 AM, Bauss wrote:
 On Wednesday, 14 January 2015 at 01:16:54 UTC, Bauss wrote:
 Is it possible to access a pointer by its offsets.
 Ex. write a 32bit integer to a byte pointer at ex. offset 4.


 fixed (byte* Packet = Buffer) // Buffer would be a byte array

 And then to set the value of a specific offset
 *((TYPE*)(Packet + OFFSET))

 Where TYPE could be replaced by ex. uint and OFFSET by 4

 I tried to look here:
 http://dlang.org/arrays.html

 But couldn't seem to find anything like it.

 Can't seem to edit OP so at:

The forum is a web interface to a newsgroup, which also has a mailing 
list interface. So no, no editing.

 *((TYPE*)(Packet + OFFSET))

 It should be:
 *((TYPE*)(Packet + OFFSET)) = VALUE;

 VALUE has to be of the same type as TYPE of course.

void main()
{
     ubyte[16] bytes;
     for( int i=0; i<4; ++i )
     {
         *(cast( int* )( bytes.ptr + (i*4))) = i;
     }

     import std.stdio : writeln;
     writeln( cast( int[] )bytes );
}

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Wed, 14 Jan 2015 01:16:52 +0000
Bauss via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:

 Is it possible to access a pointer by its offsets.
 Ex. write a 32bit integer to a byte pointer at ex. offset 4.

yes, it is. it's same as in c/c++, except that you have to add one
magic word: `cast`. D specs has it all.