C / C++ / MFC

7-Aug-03 17:54

From MSDN:

If the hWnd parameter is not NULL and the window specified by hWnd already has a timer with the value nIDEvent, then the existing timer is replaced by the new timer. When SetTimer replaces a timer, the timer is reset. Therefore, a message will be sent after the current time-out value elapses, but the previously set time-out value is ignored.

So there's no need to "reset" a timer (which you can't actually do anyway, you can only create it or kill it).

--Mike--
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Re: How to reset Timers

gc_18-Aug-03 9:02

gc_1

8-Aug-03 9:02

Michael, thanks for your response.

I tested with the example program and WM_TIMER message is sent after the current time-out value elapsed.

Absolute 0 - Boot Sector

Like2Byte7-Aug-03 8:15

Like2Byte

7-Aug-03 8:15

Hi, I'm looking to access the Boot Sector (Absolute 0) and posibly edit the contents there (or slightly beyond there, so as not to adversly effect the OS).

I know that quicken tried this and ticked off their customer-base - me included. However, the powers that be in my life deem that I must do this also.

So, the question is: How can I access the Boot Sector on a FAT32 system using VC++ 6.0? Or do I have to use Assembly (Which I don't know - at all )?

Anyone?

Nish Nishant7-Aug-03 8:24

Nish Nishant

7-Aug-03 8:24

You can use CreateFile to open \\.\C: and then start redaing/writing. I guess by default it'd be at the beginning of the disk. If you want some working code see my CFloppyDisk class that uses this technique for floppy disks. This won't work on non-NT OSes like 98 and ME. For them you gotta use DeviceIoControl and access vwin32.vxd (this is also demonstrated in the class)

Good luck Smile | :)

Nish

p.s. the url you will need is http://www.codeproject.com/system/cfloppydisk.asp

Extending MFC Applications with the .NET Framework [NW] (My book with Tom)
Summer Love and Some more Cricket [NW] (My first novel)
Shog's review of SLASMC [NW]
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Like2Byte7-Aug-03 8:29

Like2Byte

7-Aug-03 8:29

While I've got your attention, I wanted to say thank you for some of your articles on The Code Project! They were extremely helpful. Big Grin | :-D

Oh, and thanks!

Nish Nishant7-Aug-03 8:32

Nish Nishant

7-Aug-03 8:32

Like2Byte wrote:
While I've got your attention, I wanted to say thank you for some of your articles on The Code Project! They were extremely helpful.

Extremely glad to hear this Smile | :)

Thanks

Nish

Extending MFC Applications with the .NET Framework [NW] (My book with Tom)
Summer Love and Some more Cricket [NW] (My first novel)
Shog's review of SLASMC [NW]
Come with me if you want to live

Michael Dunn7-Aug-03 17:58

7-Aug-03 17:58

Be aware that on NT, if you modify the MBR or any boot sector, the OS will come along a few seconds later and restore the sector from a backup copy that it keeps. You have to lock the volume before writing to the sector (however I don't know off-hand how to do this).

--Mike--
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Error

Zak_7-Aug-03 7:50

Zak_

7-Aug-03 7:50

Hi (for the second time today),

I'm getting the following error and im not sure why -

d:\projects\common\winctrls.cpp(145) : fatal error C1010: unexpected end of file while looking for precompiled header directive

When you double click the error (in VC6) it takes me to the end of "WinCtrls.cpp", which is the implementations of all of the class functions defined in "WinCtrls.h". Now I dont know much about the compilation process, but the only "non code" bits I have are a #IFNDEF, a #DEFINE, and a #ENDIF. Does anyone know what may be wrong. I'll try and explain further if needed.

Many thanks again

Zak

Maximilien7-Aug-03 8:03

Maximilien

7-Aug-03 8:03

did you forget to add #include <stdafx.h> as the FIRST include statement in your .cpp file ?

have you forgotten something in a .h file somewhere ?

maybe an #endif or a closing brace } or a ;

Maximilien Lincourt
"Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )

Like2Byte7-Aug-03 8:27

Like2Byte

7-Aug-03 8:27

In addition to the other reply you got you should also check to ensure that any third-party installed headers in 'some' directory are listed in your include paths in the Project Settings tool.

In the C++ tab under 'include directories' Add the *.h/hpp file to your 'include directories' settings:
ie: C:\thirdpartysdk\inc

In the Link tab under the 'Input' category, add the name that contains the library (*.lib file) to the class you're implementing.

As above, enter the path to the directory containing the lib file in the 'Additional Library Path.'

I know this is more than you need at this moment but I think it will help out in the future.

Michael Dunn7-Aug-03 18:16

7-Aug-03 18:16

See the FAQ http://www.codeproject.com/cpp/cppforumfaq.asp#cl_nopch[^]

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Maximilien7-Aug-03 18:23

Maximilien

7-Aug-03 18:23

speaking of which, didn't the faq appeared on the top of the window ? I had to search for it yesterday

Maximilien Lincourt
"Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )

Michael Dunn9-Aug-03 6:56

9-Aug-03 6:56

I asked Chris about it yesterday. He said he's redoing some parts of the site layout, and the FAQ link will come back soon (but it will only be visible when you're in the C++ forum).

--Mike--
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print preview ???

_skidrow_vn_7-Aug-03 7:23

_skidrow_vn_

7-Aug-03 7:23

I want to call print preview window of IE to preview "myfile.htm"
which similar with File/Print Preview... in IE command
Is it possible?

Problem with CMenu

Ph@ntom7-Aug-03 6:26

Ph@ntom

7-Aug-03 6:26

Hi all,

I am using this code to make my Menu disabled.

CMenu theMenu ;
theMenu.LoadMenu(IDR_MNU_MUM_MAIN) ;
CMenu *submenu = (CMenu*)theMenu.GetSubMenu(0) ;
submenu->EnableMenuItem(ID_FILE_SIGNOUT, MF_DISABLED |MF_GRAYED) ;

Kindly help me how to figure out why this is not working.

Thanks.

The Phantom.

Re: Problem with CMenu

Rage7-Aug-03 6:42

Rage

7-Aug-03 6:42

http://www.codeproject.com/cpp/cppforumfaq.asp#mfc_disablemenu[^]

~RaGE();

Desktop window

Zak_7-Aug-03 5:13

Zak_

7-Aug-03 5:13

Hi,

I want to make a dialog only based program without using MFC or anything. Problem is I need a parent HWND variable to send to the DialogBox() function. Im assuming I should pass the HWND of the desktop but Im not sure. If this is what I should be doing, how do I retrieve this, but if not, how should I go about this?

Thanks

Zak

Re: Desktop window

Ryan Binns7-Aug-03 5:19

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