C / C++ / MFC Discussion Boards

RChin23-Mar-04 0:24

23-Mar-04 0:24

If you are using the MFC in your application, you can handle the ON_UPDATE_COMMAND_UI handler for your menu item (you can do this via Class wizard). Then its a matter of setting the state of your item pCmdUI->Enable(isEnabled?TRUE:FALSE);

I Dream of Absolute Zero

Re: How to disable a menu button

Steve S23-Mar-04 2:07

Steve S

23-Mar-04 2:07

If you aren't using MFC, then you can get the menu handle for the window (normally the top level window), and then get a handle for the sub-menu from there (they start at zero, of course!), and finally modify the state of a given item.

APIs to check out are:

HMENU GetMenu( HWND hWnd );
HMENU GetSubMenu( HMENU hMenu, int nSub );
BOOL SetMenuItemInfo( HMENU hMenu, UINT uItem,
BOOL fByPos, LPMENUITEMINFO lpmii);

That should take care of most things.

Steve S

Re: How to disable a menu button

Caoimh23-Mar-04 2:32

Caoimh

23-Mar-04 2:32

I'm using MFCs

How to create chm format files?

wood22-Mar-04 23:57

wood

22-Mar-04 23:57

Hi,everybody,I want to know how to create chm format files?I know that the Microsoft compiler must be used,but I really don't know how to use it.Can you tell me what I should to do ?Help me,Please! Frown | :(

Re: How to create chm format files?

RChin23-Mar-04 0:20

RChin

23-Mar-04 0:20

You can use the HTML Help Workshop[^] from the Microsoft website to create these.

I Dream of Absolute Zero

Re: How to create chm format files?

wood23-Mar-04 13:57

wood

23-Mar-04 13:57

Oh,I think I didn't represented it clearly,sorry!
I want to create chm files by my program,I want to know how to use the Microsoft's compiler in my program.Thanks!

How to get the current item in combo box?

ansontong22-Mar-04 23:51

ansontong

22-Mar-04 23:51

Dear All,

I just created a combo box in VC++ 6.0 enviroment. but dont know how to get the selected item. I am using MFC to create this combo box

Regards,
Anson Tong

Re: How to get the current item in combo box?

ansontong22-Mar-04 23:58

ansontong

22-Mar-04 23:58

Sorry, i am NOT using MFC to create this combo box

Regards,
Anson Tong

Re: How to get the current item in combo box?

Monty²23-Mar-04 0:19

Monty²

23-Mar-04 0:19

Without MFC

int nCurSel = (int)SendMessage(hWndComboBox, CB_GETCURSEL, 0, 0);

will give the Currently Selected Item.
or

char szText[255];
GetWindowText(hWndComboBox,szText,255);

Hope it helps Smile | :)

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Re: How to get the current item in combo box?

Branislav23-Mar-04 2:36

Branislav

23-Mar-04 2:36

It is better to use SendMessage(hWndComboBox, CB_GETLBTEXT, nCurSel, (LPARAM) (LPCSTR) szText) instead GetWindowText.

Re: How to get the current item in combo box?

David Crow23-Mar-04 2:51

David Crow

23-Mar-04 2:51

Why?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: How to get the current item in combo box?

rrrado23-Mar-04 3:07

rrrado

23-Mar-04 3:07

If i rememeber good, GetWindowText won't returns text oly if you're using editable combo box,
it won;t return you selection in droplist combobox

rrrado

Re: How to get the current item in combo box?

David Crow23-Mar-04 3:11

David Crow

23-Mar-04 3:11

I use GetWindowText() for all three styles.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: How to get the current item in combo box?

Branislav23-Mar-04 3:12

Branislav

23-Mar-04 3:12

This windows message is used for a combo box. If you have multiple choice what you expected to get, and GetWindowText copies the text specified window's title bar, but if you have a window control, the text of the control is copied but you never be sure which text will be copied.

Re: How to get the current item in combo box?

David Crow23-Mar-04 3:21

David Crow

23-Mar-04 3:21

Branislav wrote:
This windows message is used for a combo box.

Which is what the OP was inquiring about.

Branislav wrote:
If you have multiple choice...

You can't have multiple choices with a combobox.

Branislav wrote:
...but if you have a window control, the text of the control is copied but you never be sure which text will be copied.

This makes no sense. How could you not be sure what text will be retrieved?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: How to get the current item in combo box?

Branislav23-Mar-04 3:57

Branislav

23-Mar-04 3:57

Yes, you are right I am thinking about list box but in MSDN about potential message-map:
ON_CBN_SELCHANGE The selection in the list box of a combo box is about to be changed as a result of the user either clicking in the list box or changing the selection by using the arrow keys. When processing this message, the text in the edit control of the combo box can only be retrieved via GetLBText or another similar function. GetWindowText cannot be used.

Re: How to get the current item in combo box?

David Crow23-Mar-04 4:06

David Crow

23-Mar-04 4:06

Branislav wrote:
ON_CBN_SELCHANGE The selection in the list box of a combo box is about to be changed

Wrong. The CBN_SELCHANGE message is sent after the selection has changed.

Branislav wrote:
When processing this message, the text in the edit control of the combo box can only be retrieved via GetLBText or another similar function. GetWindowText cannot be used.

Wrong again. GetWindowText() can most certainly be used at this point, as the combobox has already been updated to reflect the new selection.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: How to get the current item in combo box?

rrrado23-Mar-04 4:53

rrrado

23-Mar-04 4:53

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_ccombobox.3a3a.ccombobox.asp
says this :

ON_CBN_SELCHANGE The selection in the list box of a combo box is about to be changed as a result of the user either clicking in the list box or changing the selection by using the arrow keys. When processing this message, the text in the edit control of the combo box can only be retrieved via GetLBText or another similar function. GetWindowText cannot be used.

rrrado

Re: How to get the current item in combo box?

David Crow23-Mar-04 5:34

David Crow

23-Mar-04 5:34

That's all well and good, but MSDN is not always correct. Reality dictates that GetWindowText() can be used, and is what I always use in response to the CBN_SELCHANGE message. Go ahead, give it a try.

BTW, the link you meant to specify is here.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: How to get the current item in combo box?

David Crow23-Mar-04 2:52

David Crow

23-Mar-04 2:52

Are you wanting the index of the selected item, or the value of the selected item? In other words, if your listbox contained the following items:

Apple
Orange <<-- selected item
Kiwi

The index of the selected item would be 1, while the value of the selected item would be Orange.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Autocad objects and VC++

super22-Mar-04 23:13

super

22-Mar-04 23:13

Hi,
hi i need some info abt using of autocad objects in VC++ application..
Basically its manipulation of autocad files via VC++ application...
So any links, books , any material will be useful..

cheers,
Super
------------------------------------------
Too much of good is bad,mix some evil in it

How to do Application Initialization while showing a SplashScreen ?

ppp00122-Mar-04 23:05

ppp001

22-Mar-04 23:05

Hi all,

How should I show up a splashscreen while my application init ?
I am using MFC application wizard to create it(dialog based)

Thanks

Re: How to do Application Initialization while showing a SplashScreen ?

MyttO22-Mar-04 23:23

MyttO

22-Mar-04 23:23

There's a wonderfull class for it!
goto:
CSplashScreenEx : a non rectangular splash screen class with Alpha blending

-MyttO

Re: How to do Application Initialization while showing a SplashScreen ?

David Crow23-Mar-04 2:55

David Crow

23-Mar-04 2:55

Search MSDN for an October 1999 article by Paul DiLascia. It has a good splash screen implementation.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

CTime's 2,038 year bug!

k52322-Mar-04 22:49

k523

22-Mar-04 22:49

my project use CFile and CTime objects classes of the MFC foundation class libraries. CTime objects can be used to represent dates between January 1, 1970, and January 18, 2038.

but problem will appear, when change the time of computer more then 2038, my software crack!!!

so... of cause I can replace the CTime object with COleDateTime object, but the other MFC object CFile use CTime object in his class, ......

What can I do for resolve this bug?

help me! Cry | :((

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