C / C++ / MFC

Re: Read and Write Raw Sectors

16-Oct-07 19:59

Hi All,

Does anyone recall a good artilce on Reading and Writing Raw Sectors under the NT family?

Jeff

Jeffrey Walton16-Oct-07 20:41

Getting the length of a string of a buffer

16-Oct-07 20:41

Found it... It was the October 2006 code winner: Building your own operating system[^]

steve_rm16-Oct-07 19:55

steve_rm

16-Oct-07 19:55

Hello,

I have a buffer that contains words. However, the words comes from a client. I just want to get the words out. However, the buffer is being filled with rubbish after the words. Example "Manchester United&^&*#&#&##^&#@*&^^ etc.

How can I just get "Manchester United" out?

I have used the following using length and substring, but it displays everything

<br />
char buffer[256];		<br />
		sock.receiveFrom(buffer,sizeof(buffer), addr);<br />
		std::string message = buffer;<br />
		int strLength = 0;<br />
		strLength = message.size();<br />
		std::cout << "The length of the string is: " << strLength << std::endl;<br />
		message = message.substr(0,strLength);<br />
		std::cout << message;<br />

Many thanks,

Steve

Jeffrey Walton16-Oct-07 20:03

16-Oct-07 20:03

Hi Steve,

Perhaps Socket.Available Property[^] will be useful to you.

Jeff

Roger Broomfield16-Oct-07 20:23

Roger Broomfield

16-Oct-07 20:23

ensure the buffer is properly initialized to all zeros and make sure to tell the sock.receiveFrom to not overwrite what could be the last null terminator

char buffer[256] = { 0 }; <br />
sock.receiveFrom(buffer,sizeof(buffer)-1, addr);<br />

char buffer[256]; <br />
ZeroMemory(buffer,sizeof(buffer));<br />
sock.receiveFrom(buffer,sizeof(buffer)-1, addr);<br />

steve_rm16-Oct-07 21:30

steve_rm

16-Oct-07 21:30

Thanks,

That worked great,

Steve

David Crow17-Oct-07 3:03

David Crow

17-Oct-07 3:03

But what happens if you then receive a shorter string of characters from the socket? Parts of "Manchester United" will still be intact. While calling ZeroMemory() may to work, a better solution was suggested by chandu004.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

chandu00416-Oct-07 20:52

chandu004

16-Oct-07 20:52

what roger has suggested is good.
but i think, your receive function should return, the number of bytes actually read.
so based on that number, you can cut your string to that many number of bytes.
im not sure but just try it out.

Jeffrey Walton16-Oct-07 21:22

16-Oct-07 21:22

chandu004 wrote:
so based on that number, you can cut your string to that many number of bytes.

And then NULL terminate...

Jeff

chandu00416-Oct-07 21:54

chandu004

16-Oct-07 21:54

yah obviously.

Jeffrey Walton16-Oct-07 21:59

16-Oct-07 21:59

chandu004 wrote:
yah obviously.

Perhaps not... Smile | :)

Resizing child windows

kk.tvm16-Oct-07 19:51

kk.tvm

16-Oct-07 19:51

Hi Friends

In my program there are too many child windows arraged horizontally. How can change size of each sub windows

thanks in advance

-RisKhan-

Nibu babu thomas16-Oct-07 20:05

Nibu babu thomas

16-Oct-07 20:05

RisKhan wrote:
In my program there are too many child windows arraged horizontally. How can change size of each sub windows

Here is a hint -> http://nibuthomas.wordpress.com/2007/09/24/moving-child-windows-of-a-window-at-one-go/[^]. The demo shows how to move all windows but you can customize it to do resizing of child windows.

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Hamid_RT16-Oct-07 21:03

Hamid_RT

16-Oct-07 21:03

Does MoveWindow helpful?

David Crow17-Oct-07 2:53

David Crow

17-Oct-07 2:53

RisKhan wrote:
In my program there are too many child windows arraged horizontally.

So can't you just rearrange them via the resource editor?

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer17-Oct-07 2:59

17-Oct-07 2:59

I'm not entirely sure I see your problem. If it is your program, don't put too many in a row in the first place.

Either by using the resource editor as David suggested, or putting something in the Y parameter of CreateWindow when you call that.

If these windows can move depending on other conditions, and there are a lot of them, then you should look at the DeferWindowPos family of functions.

Iain.

Timer in SDI application

neha.agarwal2716-Oct-07 19:30

neha.agarwal27

16-Oct-07 19:30

Hi all,

I want to implement a timer in my simple sdi applcation. How to do it?

Thanks in advance

Re: Timer in SDI application

_AnsHUMAN_ 16-Oct-07 19:44

_AnsHUMAN_

16-Oct-07 19:44

neha.agarwal27 wrote:

I want to implement a timer in my simple sdi applcation. How to do it?

See Here[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Timer in SDI application

Hamid_RT16-Oct-07 21:04

Hamid_RT

16-Oct-07 21:04

You can use of WM_TIMER and SetTimer.

how to recover c++ files

rjkg16-Oct-07 19:05

rjkg

16-Oct-07 19:05

my systems all c++ .h files showing 0 bytes can i write any programme to recover my data back

RajeshGupta

Paresh Chitte16-Oct-07 19:15

Paresh Chitte

16-Oct-07 19:15

Try using data recovery softwares. I Hope you will get all your files back in working. Smile | :)

Regards,
Paresh.

Hamid_RT16-Oct-07 19:16

Hamid_RT

16-Oct-07 19:16

0 bytes? Did you delete content of these files?

rjkg16-Oct-07 19:43

rjkg

16-Oct-07 19:43

I try may data recovery softwres but could not recover the file .
can you suggest me some other softwares. i donot know how the data becomes zero bytes in every files . is there any conditions in data recovery

Rajesh

Paresh Chitte16-Oct-07 20:14

Paresh Chitte

16-Oct-07 20:14

Have you deleted the contents of the files ?

Regards,
Paresh.