Re: interesting problem - C / C++ / MFC Discussion Boards

what does this menu command error warning message mean?

trustno115-Dec-02 15:39

15-Dec-02 15:39

hi everybody,

i made a couple customized commands on my menu. i bind all the event handlers to the commands and they work correctly.. when i was running/testing my program, i check out the debug/output windows and i noticed i keep on getting error warning messages on the commands that i defined.. can someone please tell me what does this message mean? altho it doesn't affect the functionality of the program, i want to know what does it mean exactly.. thx in advance..

the error message:

Warning: no message line prompt for ID 0x0098.

Re: what does this menu command error warning message mean?

Michael Dunn15-Dec-02 16:06

Michael Dunn

15-Dec-02 16:06

When your main frame has a status bar, MFC shows flyby help in the status bar for the selected menu item. The debug msg is saying that you don't have a flyby help string for the menu item with ID 0x98. You can set a help string by double-clicking the menu item in the menu editor, then filling in the "Prompt" field in the property sheet.

--Mike--
If it doesn't move and it should: WD-40. If it moves and it shouldn't: duct tape.

1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Temperature Sensors

zenboy15-Dec-02 14:52

zenboy

15-Dec-02 14:52

Anyone have any references for detecting temperature sensors on a motherboard and reading them?? Confused | :confused:

PRETTY PLEASE

Re: Temperature Sensors

567890123415-Dec-02 20:00

5678901234

15-Dec-02 20:00

http://www.codeguru.com/forum/showthread.php?s=&threadid=173109&highlight=temperature

http://www.codeguru.com/forum/showthread.php?s=&threadid=209801&highlight=temperature

Easier Tab control?

Mr.Freeze15-Dec-02 14:45

Mr.Freeze

15-Dec-02 14:45

Hi,

I have an application with many tab controls (and in many of them I have other sub-tab controls) and I feel that it is heavy/troublesome to create new tabs or to maintain the existing ones.
Is there a way where I could just edit new tab controls visualy without having to create a new dialog for its content everytime?

I imaging being able to add a tab control to my dialog. Then I would simply specify the labels for my different sheets and by clicking a specific label, its content would be displayed and editable.

Now I always have to create a new dialog for every tiny sheet, then programatically set up everything and see the result only when running the application.

Thanks for your help Smile | :)

interesting problem

Sunnygirl15-Dec-02 14:04

Sunnygirl

15-Dec-02 14:04

hello @all,

i have a dialogbased program.
there a two buttons (eg. button1 and button2).
if i press button1 first i get a new dialog (ID_DIALOG_COMBO) with a combobox (m_ctrlComboBox).
if i press the button2 a CString (CString mystring) should be enterd into the combobox from the ID_DIALOG_COMBO.

how can i do this????
thank you very much

this is only an example, to explain the real background would be take to much time

sunny

Re: interesting problem

Colin Urquhart15-Dec-02 14:48

Colin Urquhart

15-Dec-02 14:48

Looks like you need a modeless dialog.

Take a look at Nish's tutorial..
http://www.codeproject.com/dialog/gettingmodeless.asp[^]

Re: interesting problem

zarzor15-Dec-02 14:59

zarzor

15-Dec-02 14:59

"Think about what you want the program to do. How would you do it manually ?" Christian Graus- Dec 02

Roll eyes | :rolleyes:

ZARZOR13

Re: interesting problem

kjessee15-Dec-02 15:01

kjessee

15-Dec-02 15:01

Put button 2 on ID_DIALOG_COMBO

Kevin

Re: interesting problem

Sunnygirl15-Dec-02 21:11

Sunnygirl

15-Dec-02 21:11

i would be happy if i could do this, but the real program is more complicated...

i must have to different buttons, because if you have not a right password (somewhere before) you cannot see the ID_DIALOG_COMBO

thanks sunny

Re: interesting problem

Anonymous15-Dec-02 17:06

Anonymous

15-Dec-02 17:06

I would create the dialog in a thread, use a CStringArray for the contents of the combo box and create a function to refresh the combo.

_beginthread( ShowDialog, 0, ID_DIALOG_COMBO );

LRESULT ShowDialog( LPVOID pVoid )
{
CDialog Dlg;
Dlg.Create( pVoid );
Dlg.DoModal();
return TRUE;
}

or

CMyDialog* pDlg = new CMyDialog;
pDlg->... // initialize members
_beginthread( ShowDialog, 0, (void*)pDlg );

LRESULT ShowDialog( LPVOID pVoid )
{
CDialog* pDlg = (CDialog*)pVoid ;
pDlg->DoModal();
delete pDlg;
return TRUE;
}

The pointer method is preferable because you can store the pointer(s) and control the dialog using these pointers. Make a function to refresh your combo and call it through any initialized pointers. Maybe use a CPtrArray.

'sqrt' : undeclared identifier

rbc15-Dec-02 13:03

rbc

15-Dec-02 13:03

Why is that Visual C++'s GUI knows about sqrt yet the compiler doesn't? Confused | :confused:

As I edit my source I typed in sqrt and as I start to
type in the paramters the GUI presents me with 3 different prototypes of sqrt ... I think cool Visual C++ knows about sqrt ... so I typed sqrt( myDouble ); as per
the GUI. Yet I get a compiler error? Dead | X|

Re: 'sqrt' : undeclared identifier

Christian Graus15-Dec-02 13:15

Christian Graus

15-Dec-02 13:15

Because the IDE searchs all the headers in the include paths, but the compiler requires that you include them. It's probably math.h, or cmath ( which, if it works, is preferred ). Also cmath may require you use std::sqrt. All of this is a guess, but I am pretty sure that math.h at least will be the right one, and it's certainly a missing #include.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: 'sqrt' : undeclared identifier

rbc15-Dec-02 13:23

rbc

15-Dec-02 13:23

My code looks kinda like this ...

#include "math.h"
#include "stdafx.h"
.
.
.
double BlahBlah::Blah_Abs ( double real, double img ) {
	double rc = real * real + img * img;
	return sqrt( rc );
}
.
.
.

Yet the compiler does not complain about not be able to find math.h in the include path so I must assume that VC++ knows about math.h and since the compiler errors on sqrt ( rc ); I guess that sqrt( double ) is not declared in math.h Confused | :confused:

Re: 'sqrt' : undeclared identifier

kjessee15-Dec-02 13:45

kjessee

15-Dec-02 13:45

include the math.h file

I bet it will work.

Kevin

Re: 'sqrt' : undeclared identifier

Ravi Bhavnani15-Dec-02 13:49

Ravi Bhavnani

15-Dec-02 13:49

sqrt requires #include <math.h>

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: 'sqrt' : undeclared identifier

Christian Graus15-Dec-02 14:51

Christian Graus

15-Dec-02 14:51

Just to reiterate and add my voice to the cacophany, the intellisense parses all include paths, but the compiler will only compile if you actually include the bits you need in your code.

I suggest that it's a wise course of action when people answer your question to try the suggested solution before arguing about it.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: 'sqrt' : undeclared identifier

rbc15-Dec-02 15:33

rbc

15-Dec-02 15:33

I am including math.h but codeproject thinks le math.h ge is somekind of
HTML tag! Dead | X|

And WTF is this ...

I suggest that it's a wise course of action when people answer your question to try the suggested solution before arguing about it.

... about? I am not arguing about anything OMG | :OMG:

Re: 'sqrt' : undeclared identifier

Christian Graus15-Dec-02 15:42

Christian Graus

15-Dec-02 15:42

My apologies - you didn't check the 'display message as is' option, nor did you use the buttons above the emoticons which would replace a < with a < and so on, making it show OK. As a result I presumed you were saying what you said in the first place, as did all the other people who replied.

I see you have edited the code now Blush | :O

)

#include "math.h"
#include "stdafx.h"

Anything before stdafx.h is ignored. Move it down and it will work.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: 'sqrt' : undeclared identifier

Nick Parker15-Dec-02 16:18

Nick Parker

15-Dec-02 16:18

Christian Graus wrote:
Anything before stdafx.h is ignored. Move it down and it will work.

As noted on page 216 of Programming Windows with MFC. Poke tongue | ;-P

I knew I had read that before and I had to look it up.

Nick Parker

You see the Standards change. - Fellow co-worker

Re: 'sqrt' : undeclared identifier

rbc17-Dec-02 17:11

rbc

17-Dec-02 17:11

DOH!

Thanks!

setting the behavior of the context popup menu

trustno115-Dec-02 11:04

trustno1

15-Dec-02 11:04

hi everybody,

i had a sdi project, based on treeview. i want to setup context popup menu in such way so that the popup menu only pops up whenever the user right click on a node of the tree, sorta like how the popup menu works in windows explorer. any suggestion is welcome.. thanx in advance.

Re: setting the behavior of the context popup menu

Joseph Dempsey15-Dec-02 11:42

Joseph Dempsey

15-Dec-02 11:42

you will need to setup a handler for a message that is reflected from the tree view back to the parent. Check this message, NM_RCLICK. Then you need to use the tree controls hittest functions to determine if the mouse position is on one of the nodes in question. Once you have that you can display your context menu. Hope that helps. For more info search msdn for the NM_RCLICK message and also lookup message reflection for a broader overview of the topic. Good luck.

Joseph Dempsey
joseph_r_dempsey@yahoo.com

"Software Engineering is a race between the programmers, trying to make bigger and better fool-proof software, and the universe trying to make bigger fools. So far the Universe in winning."
--anonymous

GetMailslotInfo returns incorrect lpMessageCount

mwilliamson15-Dec-02 10:48

mwilliamson

15-Dec-02 10:48

I've got a program that uses mail slots. My problem is that when I send a mail message to the local machine the message is recieved twice. I have narrowed this down to my sending code by changing it to send to the microsoft messenger service. The messeneger service recieves the message twice too. However, it I use net send to send the message it is only recieved once. I think net send uses the NetMessageBufferSend function, but I should still only recieve once. If I send to a remote machine with the same code, it is only recieved once. I have tested it on two machines and both have the problem. My code to send is as follows:

{
int nResult;
HANDLE pHandle;
DWORD dwBytesSent;
CString strMailslotName;

strMailslotName = _T("\\\\");
strMailslotName += m_sComputerName;
strMailslotName += _T("\\mailslot\\messngr");

pHandle = CreateFile( strMailslotName, GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
if( pHandle == INVALID_HANDLE_VALUE )
{
AfxMessageBox("Error accessing mail slot \"" + strMailslotName + "\"");
CloseHandle( pHandle );
return;
}
else
{
nResult = WriteFile( pHandle, strMsgText, ( DWORD )strMsgText.GetLength(), &dwBytesSent, NULL );
if( nResult == 0 || ( DWORD )strMsgText.GetLength() != dwBytesSent )
{
CString Error;
LPVOID lpMsgBuf;

if (!::FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL ))
{
AfxMessageBox("An unknown error occured.");
}
else
{
Error = "Error writing to mailslot: ";
Error += (LPCTSTR)lpMsgBuf;
AfxMessageBox(Error);
}
LocalFree( lpMsgBuf );
}
}
CloseHandle( pHandle );
}

Any ideas whats wrong with this? I don't see how it could be sending two messages. m_sComputerName is the local computer's name.

Thanks for you help!

Re: GetMailslotInfo returns incorrect lpMessageCount

Joel Lucsy16-Dec-02 5:19

Joel Lucsy

16-Dec-02 5:19

This is actually by design. Sending on a mailslot goes across all the available protocals installed on the machine. This means if you have both TCP/IP and IPX installed, you'd get two messages. If you peruse the documentaion more carefully you'll see that this is documented. You need to include some kind of ID with the message to you can throw out duplicates. Also note that this protocal does not ensure order of deliverly. Just because msg 1 went out before msg 2 doesn't mean you'll get msg 1 before msg 2. In testing i've found that 99% of the time you'll get them in order, but the documentation say's it this isn't guaranteed. If you need further help, let me know.

Joel Lucsy (jjlucsy@concentric.net)

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.