C / C++ / MFC

Re: Quick question about combobox [modified]

3-Jul-08 15:35

Hi all,

first of all i am using WTL but since its similar to mfc i am posting it here. I was helped here before about NOTIFY_HANDLER for WTL so that the code can monitor everytime a change has been made to my treeview and created this function:

LRESULT CMainDlg::OnSelChange(int idCtrl, LPNMHDR pnmh, BOOL& bHandled)
{	
pNMTreeView = (NMTREEVIEW*)pnmh;	
Select = pNMTreeView->itemNew.hItem;	
return 0;
}

I just want to know how I can make a version of this for a combobox change. What can i use for a combobox? If NMTREEVIEW is for treeview what is for combobox control? Select is a CTreeItem what can i use for that?

Is this still applicable:

NOTIFY_HANDLER( IDC_UPDATEDAY, TVN_SELCHANGED , OnSelChange )

Thanks,
Jayjay

Nibu babu thomas3-Jul-08 17:10

Nibu babu thomas

3-Jul-08 17:10

monsieur_jj wrote:
I just want to know how I can make a version of this for a combobox change. What can i use for a combobox? If NMTREEVIEW is for treeview what is for combobox control? Select is a CTreeItem what can i use for that?

Is this still applicable:

NOTIFY_HANDLER( IDC_UPDATEDAY, TVN_SELCHANGED , OnSelChange )

Selection change notification for a combo is CBN_SELCHANGE, CBN_SELENDOK. The latter is sent when selection change becomes permanent, and the former is sent when user is changing the selection using arrow keys/mouse but new selection is not yet permanent, also called if the selection becomes permanent (bit of live action).

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

modified on Thursday, July 3, 2008 11:47 PM

monsieur_jj3-Jul-08 17:37

3-Jul-08 17:37

Nibu,

I tried that CBN_SELCHANGED however it doesnt call my OnSelChange if ever a selection change has occured. this is my code

NOTIFY_HANDLER( IDC_UPDATEDAY, CBN_SELCHANGE , OnSelChanges )

LRESULT CPrefDlg::OnSelChanges(int idCtrl, LPNMHDR pnmh, BOOL& bHandled)
{
	pNMCombobox = (NMCOMBOBOXEX*)pnmh;
	pNMCombobox->ceItem.iItem;
	return 0;
}

It doesnt even go there. What seems to be the problem
is that right?

Thanks,
Jayjay

Nibu babu thomas3-Jul-08 17:40

Nibu babu thomas

3-Jul-08 17:40

monsieur_jj wrote:
What seems to be the problem
is that right?

monsieur_jj wrote:
NOTIFY_HANDLER( IDC_UPDATEDAY, CBN_SELCHANGE , OnSelChanges )

Is IDC_UPDATEDAY id of the combo or the tree? From your OP it looks to me as the tree id.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

monsieur_jj3-Jul-08 17:42

3-Jul-08 17:42

Its an ID of a combo-box control

Nibu babu thomas3-Jul-08 18:46

Nibu babu thomas

3-Jul-08 18:46

monsieur_jj wrote:
Its an ID of a combo-box control

So is this a CComboBoxEx control, since you are casting the notification structure to NMCOMBOBOXEX type?

If so then you've got to handle notifications...

CBEN_BEGINEDIT, CBEN_ENDEDIT.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

monsieur_jj3-Jul-08 19:05

3-Jul-08 19:05

it is a CComboBox

Naveen3-Jul-08 18:59

Naveen

3-Jul-08 18:59

The CBN_SELCHANGE message is send with WM_COMMAND where as TVN_SELCHANGED was with WM_NOTIFY. That why we have to use NOTIFY_HANDLER for handling the TVN_SELCHANGED. So if you want to handle the CBN_SELCHANGE, the macro to be used is COMMAND_HANDLER

COMMAND_HANDLER( IDC_UPDATEDAY, CBN_SELCHANGE , OnSelChanges )

and the proto of OnSelChanges should be

LRESULT OnSelChanges(WORD wNotifyCode,WORD wID,HWND hWndCtl,BOOL& bHandled );

nave

[OpenedFileFinder]

monsieur_jj3-Jul-08 19:16

Re: from file to other file

3-Jul-08 19:16

Thanks Naveen!

from file to other file

sofia_1113-Jul-08 14:27

sofia_111

3-Jul-08 14:27

when i read from file1 then write to athor file2, file 1 writen on file 2 but if file 2 contain lines more than file 1 ,this lines stay in the file 2
don't empty the file2 then write on
is there any solove to this problem?

Luc Pattyn3-Jul-08 16:42

Luc Pattyn

3-Jul-08 16:42

Hi,

I don't think it behaves like you seem to imply.
most file systems I have encountered have this behavior:
- for sequential writing, when a file gets opened normally, it gets truncated to
zero length, then grows according to the new data; the exception is when it gets
opened for "append", in which case all new data comes at the end of the existing data.
- for random-access writing, all pre-existing data remains where ever you don't
write new data; and you could truncate at will.

I am pretty sure both good old C file system, and .NET File class, behave as explained
above, so I suggest you revisit your observations.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: from file to other file

CPallini3-Jul-08 21:15

CPallini

3-Jul-08 21:15

Please post the relevant code.
Smile | :)

Trap/wrap CListCtrl messages

john john mackey3-Jul-08 8:42

john john mackey

3-Jul-08 8:42

I am actually using Hans Dietrich's XListCtrl, but the question I have is general CListCtrl.

When I press the mouse in my CListCtrl resource, I don't know exactly which message I should be trapping and handling the event for. There are like HUNDRES of LVM_, LVN_, NM_, ...) messages.

I want to trap the message, do my operation, and then pass the normal message-handling onto the associated message in XListCtrl class.

I just want to trap a Left-Mouse Click, check the row/col (iItem, iSubItem), get which row was clicked, and then pass along to XListCtrl operation....

Thanks,
John John

Re: Trap/wrap CListCtrl messages

led mike3-Jul-08 9:09

led mike

3-Jul-08 9:09

john john mackey wrote:
I just want to trap a Left-Mouse Click

You mean like NM_CLICK?

led mike

Re: Trap/wrap CListCtrl messages

john john mackey3-Jul-08 9:33

john john mackey

3-Jul-08 9:33

If that be the one (obvious), then I will give it a try.

Thanks.
John John

Drawing a BitMap

Cozmo233-Jul-08 7:05

Cozmo23

3-Jul-08 7:05

Im writing a function that draws a titleblock in the bottom corner of the page and have it all drawn and still need to place a bitmap in the titleblock. Is there a simple way to do this, all my searches have come up with really complicated explanations.

Mark Salsbery3-Jul-08 7:28

Mark Salsbery

3-Jul-08 7:28

Are you drawing a bitmap on a bitmap or drawing a bitmap to a window?

Are the bitmaps DDBs or DIBs (or something else)?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Cozmo233-Jul-08 7:39

Cozmo23

3-Jul-08 7:39

Drawing on a window page, similar to a visio page. Im just wanting to take a logo, either jpeg,bmp or some other picture file and be able to insert it into the title block I drew.

Mark Salsbery3-Jul-08 7:52

Mark Salsbery

3-Jul-08 7:52

I suppose the easiest way is using GDI+

#include <gdiplus.h>

#pragma comment(lib, "gdiplus.lib" )

...
	ULONG dwToken;
	Gdiplus::GdiplusStartupInput input;
	Gdiplus::GdiplusStartupOutput output;
	Gdiplus::Status status = Gdiplus::GdiplusStartup(&dwToken, &input, &output);
	if(status == Gdiplus::Ok)
	{
		Gdiplus::Bitmap SrcBitmap(L"c:\\my.jpg", FALSE);
		Graphics DestGraphics(hwndWindowToDrawOn);
		DestGraphics.DrawImage(&SrcBitmap, 0, 0);

		Gdiplus::GdiplusShutdown(dwToken);
	}

Note that if you use gdi+, all that initialization code only needs to be done once at application
startup and shutdown, so it really only takes 3 lines of code to load and render a bitmap.

Mark