Trouble Setting a KEEPALIVE Socket Option with WinSock - C / C++ / MFC Discussion Boards

Moak16-Aug-04 5:26

16-Aug-04 5:26

Check if you have declared a variable with prefix 'm_' locally in your method somewhere above the code you have showed. Microsoft debugger gets confused when you have (by accident) a member varaiable and a local variable with the same name. It gives exactly the strange behaviour you described.

/Moak

Re: Code executing that should be

BlackDice16-Aug-04 5:36

BlackDice

16-Aug-04 5:36

Sorry, I think I found out what the problem was. I still had my configuration set for 'Release'. the values it was returning were true, but I just couldn't see them when I stepped through because I was in Release Mode. Once I set my configuration back to 'Debug' I was able to see the true values. Thanks, though!!!

[insert witty comment here]

bdiamond Sleepy | :zzz:

Open a USB - Port

postamt16-Aug-04 4:16

postamt

16-Aug-04 4:16

hi,

how can open a USB - Port with CreateFile (...) function, i know how to use this function but which String should i pass for the first parameter?

i know that this => CreateFile("USB", ...) doesnt work.
does somebody has an idea?

thanks thomas.

Re: Open a USB - Port

Cedric Moonen16-Aug-04 22:12

Cedric Moonen

16-Aug-04 22:12

It depends of the device connected. Check the documentation supllied with the driver of your device.

Sniffer design

A Khan16-Aug-04 3:45

A Khan

16-Aug-04 3:45

Hi there,

i am working on "Sniffer application".... can anyone please suggest any resources for help/code examples.

Regards.

Re: Sniffer design

Ravi Bhavnani16-Aug-04 4:11

Ravi Bhavnani

16-Aug-04 4:11

See this[^] article.

/ravi

My new year's resolution: 2048 x 1536
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Re: Sniffer design

Antony M Kancidrowski16-Aug-04 4:33

Antony M Kancidrowski

16-Aug-04 4:33

You may want to take a look at WinPCap[^] And Ethereal[^]

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Trouble Setting a KEEPALIVE Socket Option with WinSock

jerry1211a16-Aug-04 3:27

jerry1211a

16-Aug-04 3:27

I have an application where I am attempting to set a socket option using "setsockopt." I want to set the KEEPALIVE feature to "ON."
The format is: setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &optval, sizeof(optval)); I am trying to detect if a socket is HUNG, or if a network wire has become disconnected. Some documentaion indicates that optval must be a pointer to a char but other places I have seen it should be an int. I cant seem to get it to work.

This code snippet will not work as some of the documentation seems to indicate:
*************************************
int value = 1; //ON
setsockopt(mysocket, SOL_SOCKET, SO_KEEPALIVE, &value, sizeof(value));
*************************************
Can someone tell me how to set up the KEEPALIVE feature.

Thanks.
Smile | :)

Jerry

Modal dialog coordinates

Johnny Peszek16-Aug-04 2:53

Johnny Peszek

16-Aug-04 2:53

Hi!

I have a dialog based application with one modal dialog as an inserted dialog resource. The modal dialog is always displayed in the middle of the dialog based application. I would like to display it not in the middle but with given coordinates e.g. in the upper left corner of the screen. Can somebody help me?

Regards.

Re: Modal dialog coordinates

Ravi Bhavnani16-Aug-04 3:42

Ravi Bhavnani

16-Aug-04 3:42

You can reposition the dialog by making a call to MoveWindow() or SetWindowPos() in the dialog's WM_INITDIALOG handler. Here's an example of how to position the dialog at the top left corner.

CRect rectDlg;
GetWindowRect (&rectDlg);
int nWidth = rectDlg.Width();
int nHeight = rectDlg.Height;
rectDlg.left = 0;
rectDlg.right = nWidth;
rectDlg.top = 0;
rectDlg.bottom = nHeight;
MoveWindow (&rectDlg);

- or -

SetWindowPos (NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOZORDER);

/ravi

My new year's resolution: 2048 x 1536
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Re: Modal dialog coordinates

Johnny Peszek16-Aug-04 5:47

Johnny Peszek

16-Aug-04 5:47

Thanks!

Re: Modal dialog coordinates

David Crow16-Aug-04 3:52

David Crow

16-Aug-04 3:52

Call SetWindowPos() from the dialog's OnInitDialog() method.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Modal dialog coordinates

Johnny Peszek16-Aug-04 5:48

Johnny Peszek

16-Aug-04 5:48

Thanks!

Problems with 256 color toolbar and theme engine

RunninRS16-Aug-04 2:07

RunninRS

16-Aug-04 2:07

I am having an issue with my toolbars when changing themes in windows XP.
In the application I have several toolbar buttons that are inactive based on the settings the user has selected.
Under some themes, a greyed out button will be displayed as a grey box the full size of the button (looks nasty).
Under other themes, the greyed out button is a normal shadow of the colored part of the button (which is what I want).
I can get it to work under different themes, but it's a matter of going back and re-doing the background color of the toolbar. Then it will work under one, and not under others.
Am I doing somethign wrong?
Is there a 'standard' background color I am supposed to use?
I use VS C++ 6.0 and RougeWave Stingray toolkit.

I can hack my 256 color bitmaps down to 16 color and those work under all themes.. but of course.. they look awful.
(no clue why VS doesn't have a 256 color editor built in).

Thanks..

Re: Problems with 256 color toolbar and theme engine

Antony M Kancidrowski16-Aug-04 2:31

Antony M Kancidrowski

16-Aug-04 2:31

I have to admit that I have not used 256 colour toolbars with Stingray toolkit. Have you asked Roguewave support the same question? It sounds like their owner drawn toolbar is not coping with the theme change correctly.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Window style for manually created CEdit

rw10416-Aug-04 0:31

rw104

16-Aug-04 0:31

I have create some dynamic CEdit controls..

e.g...

CEdit newEdit; // as a member var of class in the header

newEdit.Create(WS_VISIBLE|ES_NUMBER|WS_DLGFRAME ,startRect,this,NULL);

...

What window style flags do I need to set so the CEdit looks like a standard CEdit that you get when adding to a dialog resource?

Thanks in advance

Re: Window style for manually created CEdit

Jaime Stuardo16-Aug-04 4:17

Jaime Stuardo

16-Aug-04 4:17

WS_VISIBLE|WS_BORDER

Jaime

Carriage return- How to identify?

Deepak Samuel16-Aug-04 0:26

Deepak Samuel

16-Aug-04 0:26

Hi, how can I identify a carriage return (\n)using fscanf ?
Thanks,

Deepak Samuel.

Re: Carriage return- How to identify?

rw10416-Aug-04 0:33

rw104

16-Aug-04 0:33

It has an ascii value of decimal 13, eg.

if(nChar==13)AfxMessageBox("Carriage Return");

Re: Carriage return- How to identify?

Deepak Samuel16-Aug-04 2:21

Deepak Samuel

16-Aug-04 2:21

I am scanning the file for interger values what happens if my file itself contains a integer value of 13 ? How can I differentiate between my data and a carriage return?`
Thanks,

Deepak Samuel

Re: Carriage return- How to identify?

jerry1211a16-Aug-04 3:32

jerry1211a

16-Aug-04 3:32

Maybe you can tell by looking for CR, LF...at the end of each line.

Re: Carriage return- How to identify?

David Crow16-Aug-04 3:56

David Crow

16-Aug-04 3:56

Character 13 and number 13 are totally different things. When using fscanf(), you must tell it what type of data is being read. In other words:

char c;
fscanf(pFile, "%c", &c);

This will not read the number 13 from the file. Likewise:

int n;
fscanf(pFile, "%d", &n);

This will not read the character 13 from the file.

Make sense?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

image processing in VC

wejahat15-Aug-04 23:21

wejahat

15-Aug-04 23:21

i've to implement Gabor filter for feature extraction from an face image in VC++6 would any body help me?

Re: image processing in VC

Maximilien16-Aug-04 0:55

Maximilien

16-Aug-04 0:55

Gabor filter ... ?!?!

is it the filter to find Zsa Zsa Gabor in an image ?!

seriously, any problem in particular or the whole algorithm ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: image processing in VC

Ravi Bhavnani16-Aug-04 4:09

Ravi Bhavnani

16-Aug-04 4:09

This[^] library will do it for you. It's compatible with VC6 and VC7.1.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
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