C / C++ / MFC

7-Aug-03 5:19

You can either pass NULL, or a handle to the desktop window. You can retrieve this with GetDesktopWindow().

Hope this helps,

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

SetDlgItemText problems

keegan7-Aug-03 4:32

7-Aug-03 4:32

Harumph. I have 2 problems, one directly related to this function, the other is not.

First, i need to use SetDlgItemText() to display an integer in a static text thingy. At least, i assume this is what i should use. I can do it just fine displaying strings, but when i try to display an int, it says it can't convert int to LPCTSTR or something similar to that. Whats the best way to fix this? Should i use some sort of integer to string conversion?

Second, i need this integer to constantly update in my dialog. What i'm doing is reading a value from a volt meter, and for each reading i get, i want to display the new value. I tried putting my SetDlgItemText() in side an infinite for loop ( for(;;) ), but when i launch the dialog window, the program crashes. This is all opccuring in the dodataexcahnge.

Grr. its the simple problems that really tick me off. :P

*.*
cin >> knowledge;

Ryan Binns7-Aug-03 4:45

7-Aug-03 4:45

1. SetDlgItemInt()
2. Using SetDlgItemInt() should solve this problem.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

keegan7-Aug-03 4:53

7-Aug-03 4:53

doh, new it was a simple one. thanks.

I still have my refreshing problem tho, any ideas? Frown | :(

*.*
cin >> knowledge;

Ryan Binns7-Aug-03 5:04

7-Aug-03 5:04

Do you know what's causing the crash? You mentioned it was in DoDataExchange(). Post your DoDataExchange() function and tell us which line is crashing.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

keegan7-Aug-03 5:13

7-Aug-03 5:13

void ReadAnalog::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);


	int value;
	value = 1;
	
        for(;;)
	{
              SetDlgItemInt( IDC_READ_ANALOG_01, value );
        }
}

at some point i will add code to read in from a meter and store a number into 'value' but until then, i just set it = 1.

I don't exactly get an error when i open the dialog window, however, the window does not open and i get the (Not Responding) thing in the title bar of my program. My assumption is that this for loop executes forever, and the page will not get created until it is finished. (I just made the loop go from 0-20, and the program worked fine.)

Is there some other place i can update the value of the static text after it has been displayed?

*.*
cin >> knowledge;

Ryan Binns7-Aug-03 5:18

7-Aug-03 5:18

keegan wrote:
My assumption is that this for loop executes forever, and the page will not get created until it is finished.

That's correct. An application is considered to be responding if it checks its message queue. You are not checking the message queue, and therefore cannot do anything (including updating the screen), and therefore the program is not responding.

The method I would use is to set a timer (for 10ms or something like that), and update the value whenever the timer message handler gets called.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

keegan7-Aug-03 5:29

7-Aug-03 5:29

ok, suppose i use Sleep(10) to wait 10 miliseconds, then display the data. This provides a problem, being that it still only updates once. You said to update whenever the timer message gets called, well, if i put this in my ddx, it will only get called once, when the page is created, correct? Is there someplace else i can add the data, after the page has been created?

I guess is what i'm asking is how do i put a an infinite for loop in a dialog box.

*.*
cin >> knowledge;

Ryan Binns7-Aug-03 5:33

7-Aug-03 5:33

keegan wrote:
I guess is what i'm asking is how do i put a an infinite for loop in a dialog box.

I hope not. That's a bad bad idea Smile | :)

What I meant was to use SetTimer() to start a timer that posts a WM_TIMER message to your message queue every 10ms or so. You then handle the WM_TIMER message, and whenever the message is received, update your dialog - don't use an infinite loop. In your WM_TIMER handler (OnTimer()), call SetDlgItemInt() to set the new value. It's not necessary to use DoDataExchange() at all.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

keegan7-Aug-03 5:48

7-Aug-03 5:48

works like a dream Big Grin | :-D

you da man Wink | ;)

*.*
cin >> knowledge;

JWood7-Aug-03 6:28

JWood

7-Aug-03 6:28

Does anyone use the undocumented PushMessage Commnad anymore? This was my solution to this problem. I geuss it is undocumented for a reason in that if you use it improproperily it can cause strange slow down and crashes, but it seems more elegent to me.

Ryan Binns7-Aug-03 13:18

7-Aug-03 13:18

JWood wrote:
PushMessage

Confused | :confused:

I've never seen that function. And if I had, I probably wouldn't use it because it's undocumented, which basically means it could change or be removed at any time Smile | :)

. I generally stick to the documented functions if possible.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Changing http_user_agent in webbrowser control

vcplusplus7-Aug-03 4:45

vcplusplus

7-Aug-03 4:45

Answer to first question.

You need to convert your int to a string;

INT MyInt = 5;
CString MyString;
MyString.Format("%d", MyInt);

SetDlgItemText(STATIC_ID, MyString);

hkulten7-Aug-03 4:21

hkulten

7-Aug-03 4:21

All is in the subject !
I would like to change the header which is sent to server by the webbrowser control from Microsoft, but how to do that ?

Any clues ?

Thanks.

Sleepy | :zzz:

How to hide process in Windows NT/XP

breakpoint7-Aug-03 3:51

breakpoint

7-Aug-03 3:51

How can I hide process from task list in Windows NT/XP?

John M. Drescher7-Aug-03 4:20

John M. Drescher

7-Aug-03 4:20

I don't think that can be done.

But you can use rundll32 to execute your dll and it will show up in the process list as rundll32...

John

Ryan Binns7-Aug-03 4:23

7-Aug-03 4:23

Why do you want to do this?

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

John M. Drescher7-Aug-03 4:36

John M. Drescher

7-Aug-03 4:36

I agree. Maybe he is writing a virus or one of those internet spy programs... Or maybe he does not want users to stop his program using the task manager...

John

Vitali Halershtein7-Aug-03 4:36

Vitali Halershtein

7-Aug-03 4:36

Hi,

this is Rare task! Are you want to write virus?
I hope NOT.

You can study technical side of this question
on the following links:

http://win32assembly.online.fr/files/hidden.zip
or
http://www.sysinternals.com
or hmmm ...
just put search string similar: " "hide process" and C++ and source " to the yahoo and read retrieved links.

breakpoint7-Aug-03 18:58

breakpoint

7-Aug-03 18:58

Thanks for your suggestions!

I am writing a program for internet cafe where i have a server and a client program. I don't want that my client program to be terminated by customers so that the server will always have control to its client pcs.

Have already done this in Windows 9x using RegisterServiceProcess() but not in Windows NT/XP. Some suggests that i should run my program as service but i don't know how to do it(how to run my program as a service in NT using MFC).