C / C++ / MFC

Re: Problem with messages reaching the appropriate class

21-Oct-07 11:01

Hi,

I have a simple GUI in which I currently have a CDialog and a CListCtrlEx. Now, I need to add a event handler for detecting and handling right click on my extended version of CListCtrl (i,e. the CListCtrl class) ... I am adding the following in the message map -

ON_NOTIFY(NM_RCLICK, IDC_LIST_CTRL, &CListCtrlEx::OnNMRclickAllEvents)

If I try it out, the function 'OnNMRclickAllEvents' never gets called. However, if I move this line to CDialog .. it works fine! I don't know what I am missing here...

Any help is appreciated.

Thanks..

Mark Salsbery21-Oct-07 11:47

Re: Problem with messages reaching the appropriate class

21-Oct-07 11:47

Try using ON_NOTIFY_REFLECT to catch the notification in the
control class.

This is an MFC feature - normally notification messages from a control
go to the control's parent window.

Mark

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

neil478121-Oct-07 12:27

Re: Problem with messages reaching the appropriate class

21-Oct-07 12:27

I used the following in my Clistctrlex :

ON_NOTIFY_REFLECT(NM_RCLICK, &CSivoListCtrl::OnNMRclickAllEvents)

That didn't work =( Do I need to add anything in the CDialog as well to make this work?

Mark Salsbery21-Oct-07 13:12

Re: Problem with messages reaching the appropriate class

21-Oct-07 13:12

Do you still have an ON_NOTIFY in the dialog class?
If so, that will override the reflected message and you should remove it.

Mark

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

neil478121-Oct-07 13:15

Re: Problem with messages reaching the appropriate class

21-Oct-07 13:15

Nope I don't have it in the main Dialog. Ok, when I described the problem I thought I would keep it simple. But I guess I should describe my exact setup..

So I have main CDialog .. in there there is a CTabCtrl. The CTabCtrl's contents are displayed by another CDialog say CSubCDialog .. not this sub dialog contains my custom CListCtrlEx. The sub dialog is able to receive the nm_rclick message fine, but CListctrlEx doesn't receive it with on_notify_refelct ..

Mark Salsbery21-Oct-07 13:38

Re: Problem with messages reaching the appropriate class

21-Oct-07 13:38

Regardless of the window hierarchy, this should work.

All notifications are between the control and its parent window,
so the main dialog and tab stuff should be irrelevant.

The control's parent window has no WM_NOTIFY handler or OnNotify()
override, correct?

Again, no ON_NOTIFY() in the parent's message map, right?

And you put the ON_NOTIFY_REFLECT90 in the control's message map, right?

The reflection is done in the control's parent, so if you override any
WM_NOTIFY processing in the control's parent, that may break the
reflection.

Mark

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

neil478121-Oct-07 13:40

Re: Problem with messages reaching the appropriate class

21-Oct-07 13:40

Answer is 'yes' for:

The control's parent window has no WM_NOTIFY handler or OnNotify()
override, correct?

Again, no ON_NOTIFY() in the parent's message map, right?

And you put the ON_NOTIFY_REFLECT90 in the control's message map, right?

It's not working. Is there any property called 'notify' = true I need to set for the list control?

Mark Salsbery21-Oct-07 14:20

Re: Problem with messages reaching the appropriate class

21-Oct-07 14:20

Hmm beats me what's going on.

Are you sure you're using a variable of the derived list control type and
not a CListCtrl?

I did a quick test....this wizard-generated code worked fine for me:

IMPLEMENT_DYNAMIC(CReflectedListCtrl, CListCtrl)

CReflectedListCtrl::CReflectedListCtrl()
{

}

CReflectedListCtrl::~CReflectedListCtrl()
{
}


BEGIN_MESSAGE_MAP(CReflectedListCtrl, CListCtrl)
    ON_NOTIFY_REFLECT(NM_RCLICK, &CReflectedListCtrl::OnNMRClick)
END_MESSAGE_MAP()



// CReflectedListCtrl message handlers


void CReflectedListCtrl::OnNMRClick(NMHDR *pNMHDR, LRESULT *pResult)
{
    LPNMITEMACTIVATE pNMItemActivate = reinterpret_cast<LPNMITEMACTIVATE>(pNMHDR);
    // TODO: Add your control notification handler code here
    *pResult = 0;
}

There's always WM_CONTEXTMENU too... Smile | :)

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

neil478121-Oct-07 14:49

Re: Problem with messages reaching the appropriate class

21-Oct-07 14:49

Thanks Mark for your prompt replies.

Well I think I am doing something wrong. I just created a test mfc application, with a simple CDialog and added a list control to it. Through the resource view, I right clicked on the list control, selected add class and create a class derived from CListCtrl. Then added a variable of type CListCtrlEx. Now again, in the similar fashion, I added on_notify_reflect(as above) in my CListCtrlEx class. I ran the app with this, and it doen't go to the handler ...

Mark Salsbery21-Oct-07 15:21

Re: Problem with messages reaching the appropriate class

21-Oct-07 15:21

What version of Visual Studio?

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

neil478121-Oct-07 15:22

Re: Problem with messages reaching the appropriate class

21-Oct-07 15:22

Visual Studio 2005.

Mark Salsbery21-Oct-07 16:06

Re: Problem with messages reaching the appropriate class [modified]

21-Oct-07 16:06

Try this in your test app...

1) get rid of the other CListCtrl class you made

2) In project menu (or class view window, right-click the project) choose Add.../Class...
choose the mfc category....go through the wizard to create the CListCtrl-derived class.
Note this is NOT from the dialog editor!

3) You should now have an empty class derived from CListCtrl. In class view, find your
new class, right-click it, and choose properties.

4) In the properties window, click the messages button - scroll down to "=NM_RCLICK" and
add a reflected handler for it using the drop-down to the right of "=NM_RCLICK".

5) Back in the dialog class, make sure you use a control variable of your new class type.
Also make sure you have a DDX_Control() entry in the dialog's DoDataExchange override
so the control object properly attaches to/subclasses the control window.

Maybe you were missing step 5 above??

Mark

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

neil478121-Oct-07 17:35

Re: Problem with messages reaching the appropriate class

21-Oct-07 17:35

It worked just fine! =) Thank you so much. What was going wrong with my initial approach?

-- modified at 23:52 Sunday 21st October, 2007

Mark Salsbery23-Oct-07 7:46

Re: Problem with messages reaching the appropriate class

23-Oct-07 7:46

Cool. Sorry it took so long to reply. The wind and fires here in
Southern California took out my power yesterday.

neil4781 wrote:
What was going wrong with my initial approach?

I'm going to take a look at that - I'm not sure what happens when you create
a class from the dialog editor like that.

I'm testing the release candidate for VS 2008 right now so I want to take
a look at it and see if there's a bug to report to MS.

I'll let you know.

Mark

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

neil478123-Oct-07 10:23

23-Oct-07 10:23

No problem. Thank you so much for your help again to resolve this problem for me.

Convert TIFF to bmp

Romiks21-Oct-07 8:58

Romiks

21-Oct-07 8:58

Hi all,
I need to convert tiff file to bmp file.
I found libtiff library.
Maybe anybody using this library?
If it possable, give me some ideas how to do that?
(TIFF encoded to CMYK)

image processing toolkits | batch image processing

C^hris L^osinger21-Oct-07 9:22

C^hris L^osinger

21-Oct-07 9:22

the easiest way to use LibTiff is with its RGBA interface:

it goes something like this:

TIFF *tif = TIFFOpen(...)
UINT32 width, height;
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);

if (TIFFRGBAImageOK(tif, msg)==0)
{
   BYTE * pBuffer = new BYTE[w * h * 4];

   TIFFReadRGBAImage(tif, width, height, pBuffer, 1);

 ... etc
}

TIFFClose(tif)

and then you will have an RGBA image from your TIFF file...

but, there are plenty of libraries out there that can do all of for you.

Romiks21-Oct-07 19:01

Romiks

21-Oct-07 19:01

Many thanks Smile | :)

, I'll try it.

but, there are plenty of libraries out there that can do all of for you.

I need it for my cross-platform application, which uses wxWidgets library.

Romiks22-Oct-07 1:53

Romiks

22-Oct-07 1:53

Now I need to show TIFF, but I have another problem with scalling the image.
Is it possable to scale the image by libtiff?
My TIFF is width:13700; height:9300.

JudyL_MD22-Oct-07 4:06

JudyL_MD

22-Oct-07 4:06

Romiks wrote:
I need it for my cross-platform application, which uses wxWidgets library

I haven't tried it, but could you use the wxImage class to open the TIFF file and then save it as a BMP file?