C / C++ / MFC

13-Jun-04 2:00

Hi guys,

I have a CListCtrl control inserted to my dialog app (MFC). I needed to customise the text display on the control and from Michael's suggestion (Thanks, Mr. Dunn!), I tried using LVN_GETDISPINFO message, which calls my OnGetDispInfo function. The problem is that the callback doesn't seem to get call when already using LPSTR_TEXTCALLBACK.

The message map is created as below:

<code>
	ON_NOTIFY_REFLECT(LVN_GETDISPINFO, OnGetDispInfo)

and the callback function is decalred in my CMyDlg class.

<code>
	afx_msg void OnGetDispInfo(NMHDR* pNMHDR, LRESULT* pResult);

I add items to the control (m_TaskList) using the way below:

<code>
	m_TaskList.InsertItem(LVIF_TEXT|LVIF_STATE, itemCount, LPSTR_TEXTCALLBACK, LVIS_SELECTED, LVIS_SELECTED, 0, 0);

and the following callback function is never called,

<code>
void CMyDlg::OnGetDispInfo(NMHDR *pNMHDR, LRESULT *pResult)
{
	LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;

	if (pDispInfo->item.mask & LVIF_TEXT)
		pDispInfo->item.pszText = _T("Testing");	
	*pResult = 0;
}

Can anyone spot where I have done wrong?
Thanks alot

valikac13-Jun-04 6:04

valikac

13-Jun-04 6:04

What change?

You have to explicitly notify the list control upon a change. One example is LVM_INSERTITEM.

Kuphryn

J.B.13-Jun-04 7:27

13-Jun-04 7:27

Thanks for the reply Kuphryn,

I'm not quite sure if I understand what you mean. In MFC, when I'm calling InsertItem() on the CListCtrl control, it euqally means sending the notification LVM_INSERTITEM to the control. Doesn't it? Confused | :confused:

Thanks again.

valikac13-Jun-04 7:40

valikac

13-Jun-04 7:40

You're not receiving the LVN_GETDISPINFO message, correct? I'm saying that you have to update the list control via sending its a message if you want to to make the change.

Kuphryn

J.B.13-Jun-04 19:58

13-Jun-04 19:58

Doesn't the call

<code>m_TaskList.InsertItem(LVIF_TEXT|LVIF_STATE, itemCount, LPSTR_TEXTCALLBACK, LVIS_SELECTED, LVIS_SELECTED, 0, 0);

mean sending a message (LVM_INSERTITEM) to the control and update it according to specified information?

LPSTR_TEXTCALLBACK tells the control the text is a callback item, so will call OnGetDispInfo()

Why do I have to explicitly send message to the control again? Am I missing something?

Thanks again

Chris Richardson14-Jun-04 11:15

Chris Richardson

14-Jun-04 11:15

Don't use ON_NOTIFY_REFLECT. That macro would be used if you were trying to do this in a class that was derived from CListCtrl. Since you are catching this message in a dialog (I suppose, based on the name CMyDlg), use ON_NOTIFY.

Good luck,

Chris Richardson

J.B.14-Jun-04 16:40

Small Challenge for all you experts

14-Jun-04 16:40

Thanks Chris,

that works for me Big Grin | :-D

bikram singh13-Jun-04 1:46

13-Jun-04 1:46

How to intercept a WM_LBUTTONDOWN on the drop-down list of a combo box?

Without using sucky MFC.

Bikram Singh

Johan Rosengren13-Jun-04 3:10

Johan Rosengren

13-Jun-04 3:10

would have loved to answer, but i dont care to experiment with SDK-programming. SDK-programming sucks big time. Stop using it dude! Give MFC a try, and you'll never come back to SDK-programming for any of your UI-related tasks. Infact, the only reason SDK is good is: none... Thats it. From a professional programmers perspective.

*laughter*

bikram singh13-Jun-04 19:34

13-Jun-04 19:34

Good for you. I dont use SDK programming except for "lower-level" tasks such as this. I assure you, if you use C++ Builder once, you would probably know why I think MFC sucks.

Bikram Singh

Johan Rosengren13-Jun-04 19:57

Johan Rosengren

13-Jun-04 19:57

Well, you said "without using MFC". Do you think this is a C++ Builder forum?

Now, as you don't seem very experienced, let me explain a few things:

MFC is a framework. You can use MFC with MSCVC++, but also CodeWarrior and the old Borland C++.

C++ Builder is a development environment. I don't know the name of the current underlying framework - in the pre-Builder days, it was OWL. VCL, perhaps?

Comparing the development environments, C++ Builder (which I have not used) was loosely built on Delphi, (which I have used). Delphi is a RAD-tool, and if you have difficulties with other development tools, you might want to stay with C++ Builder, and ask questions in appropriate foras. I'm sure that there are newsgroups targetted specifically to C++ Builder.

But of course, you are what is commonly called a troll, which I am - sad to say - currently feeding.

To summarize, my suggestion is that you either get a life, or haunt foras where you will actually get some answers. I have used more development environment than you can comfortably shake a stick at, so I think I'll leave your puerile suggestion where it belongs Laugh | :laugh:

bikram singh13-Jun-04 20:26

13-Jun-04 20:26

Johan Rosengren wrote:
Do you think this is a C++ Builder forum?

Does the board say "Visual C++" or does it say "MFC"? Or cant you read?

Johan Rosengren wrote:
But of course, you are what is commonly called a troll, which I am - sad to say - currently feeding.

I guess you get your kicks out of abusing people. You obvisouly have a rigid mindset. I said "sucky MFC" not "sucky Mr. X so-and-so".

You need to grow up.

And finally,

Stop Flaming. Stick with the program.

Bikram Singh

Johan Rosengren13-Jun-04 20:45

Johan Rosengren

13-Jun-04 20:45

bikram singh wrote:
Does the board say "Visual C++" or does it say "MFC"? Or cant you read?

I explained the difference between MFC and C++ Builder - which you seem to have gotten mixed up.

bikram singh wrote:
I guess you get your kicks out of abusing people.

Where did I abuse you?

bikram singh wrote:
You need to grow up.

And finally,

Stop Flaming. Stick with the program.

I'll leave this speaking for itself Cool | :cool:

toxcct13-Jun-04 3:10

toxcct

13-Jun-04 3:10

ah ah ah, there you need help.

hem, let me see, yess, this is easy. oh s**t, you don't want to ear about "sucky MFC"... too bad for you...
Sleepy | :zzz:

TOXCCT >>> GEII power

bikram singh13-Jun-04 19:35

13-Jun-04 19:35

ha ha !

Bikram Singh

Ravi Bhavnani13-Jun-04 11:53

Ravi Bhavnani

13-Jun-04 11:53

Will handling CBN_DROPDOWN help?

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

bikram singh13-Jun-04 19:32

13-Jun-04 19:32

Yes, that would be the starting point I know, but i am unable to capture any mouse-events on the drop-down listbox itself...

Bikram Singh

Ravi Bhavnani14-Jun-04 1:26

Ravi Bhavnani

14-Jun-04 1:26

Would CBN_SELCHANGE help? That notifies you when the active selection in the dropdown list changes. You get another notification (CBN_SELENDOK or CBN_SELENDCANCEL, depending on whether the user made a selection or pressed Esc) when the listbox closes.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

bikram singh14-Jun-04 2:54

14-Jun-04 2:54

That doesnt work either Frown | :(

The only notification I'm getting on the dropped-down listbox is WM_CTLCOLORLISTBOX, which I get each time I do a mouse-over on an item.

Nothing else! I can "capture" a right-click on an item, using GetKeyState(VK_RBUTTON), but that only works bcos I change the item-selection while keeping the R button pressed, which causes a WM_CTLCOLORLISTBOX message , in which I call GetKeyState() as above.

But this isnt a solution for me! Frown | :(

Spy++ shows no messages except WM_CTLCOLORLISTBOX Frown | :(

And thank you for helping out !

Bikram Singh

Done it !

bikram singh14-Jun-04 3:01

how to add menu on dialog?

14-Jun-04 3:01

Ultimately, I had to subclass the combobox' listbox.
Was wanting to avoid doing it though. But well, if you cant fight em join em i guess!

Bikram Singh

vividtang13-Jun-04 1:19

vividtang

13-Jun-04 1:19

hi: all
my program is based on dialog,but i want to add menu for it, i insert a menu resource and with the instruction of classwizard select associate the menu with my dialog,but when i do this ,once runing i found no menu on dialog,why , please lend me a hand.
thx

Re: how to add menu on dialog?

bikram singh13-Jun-04 1:33