C / C++ / MFC

Re: How to use WM_WTSSESSION_CHANGE?

18-Mar-02 7:47

The docs clearly states that WTS_xxx gets passed in wParam. lParam is the pointer to WTSSESSION_NOTIFICATION structure.

Tomasz Sowinski -- http://www.shooltz.com

Blake Miller15-Apr-04 9:36

Blake Miller

15-Apr-04 9:36

On Windows XP Professional SP1 -FOR CERTAIN- the lParam is merely a number - the session ID. Several General Protection Faults will prove this to you.

I think the WTSSESSION_NOTIFICATION structure is passed to the HandlerEx routine in a Windows service application (have not tried that one yet...)

The wParam lets you know what is happening, and the lParam identifies the session ID.

You can use the session id in call to WTSQuerySessionInformation to get more details for a specific session identifier.

I am currently trying to get Microsoft to document specific recommendations for applications to follow in response to each of these messages. More specific than 'avoid anything troublesome'... WTF | :WTF:

DUN

AusBloke18-Mar-02 6:28

AusBloke

18-Mar-02 6:28

<--- dummy

I want to add the capability to connect via dial up PPP to my code.. (like MS DUN)... except I have no idea where to start. Any ideas fellas.. or anyone know of any source code sample I can peruse?

Ok.. come on you smart bastards.. help on Aussie wanker out here will ya!

Aus

Vladimir Georgiev18-Mar-02 7:58

Vladimir Georgiev

18-Mar-02 7:58

Look at the msdn.microsoft.com for something called RASDIAL-something... Type RASDIAL and search for it.

"Needless redundancy is the hobgoblin of software engineering." - Peter Darnell

AusBloke18-Mar-02 9:25

AusBloke

18-Mar-02 9:25

Great!.. That has given me a start.. thanks mate. Have a good one.

Aus

Aus

Carlos Antollini18-Mar-02 8:42

Carlos Antollini

18-Mar-02 8:42

You can get a good class for ras from Dundas, or use the RasApi. Look for the fuctions RasDial into Remote Access Service Functions

Best Reagars.

Carlos Antollini.
Sonork ID 100.10529 cantollini

AusBloke18-Mar-02 9:24

AusBloke

18-Mar-02 9:24

Thanks mate.. appreciate it!!

Aus

Aus

19-Mar-02 7:16

Get the free RAS class library from Dundas Software.

This class library should do everything you need for your dialup. Plus it comes with complete source code. This class library is part of the Dundas TCP/IP product line, but was made available for free to help promote the product line.

Just to to www.dundas.com

Troy

Drag & Drop

Li Mu Bai18-Mar-02 5:53

Li Mu Bai

18-Mar-02 5:53

Hi Chaps,

Anyone got any drag & drop code examples?
having a bit of trouble with the leftbuttonup function and the HitTest() not working properly

I did this:

void CRunEICDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
if( m_bDragging )
{
ASSERT(m_pimagelist != NULL);
m_pimagelist->EndDrag();
CImageList* pTemp = m_pimagelist;
m_pimagelist = NULL;
delete pTemp;
ReleaseCapture();
m_bDragging = false;
}
// CPoint point;
// GetCursorPos( &point );
m_cTestSeq.ClientToScreen( &point );

UINT flags;
int item;
item = m_cTestSeq.HitTest( point, &flags );

item = item;

if( LVHT_NOWHERE | flags )
{
// add to end
item = item;
}
else if( LVHT_ONITEM | flags )
{
// insert before the item
item = item;
}

// }

CDialog::OnLButtonUp(nFlags, point);
}

But it doesnt recognise when the leftbutton was let go in the listControl window
any comments greatfully received

The Wudan Master

Re: Drag & Drop

Tomasz Sowinski18-Mar-02 5:55

18-Mar-02 5:55

You've used bitwise-or instead of bitwise-and with LVHT_xxx flags.

Tomasz Sowinski -- http://www.shooltz.com

Flickering list control

Andrew Stampor18-Mar-02 5:26

Andrew Stampor

18-Mar-02 5:26

I am updating a list control with several operations, including deleting some entries and adding others. Due to the speed at which the new entries must be made, I have found that I need to do a SetDraw(FALSE) prior to adding and removing the entries to ensure that all of the time critical messages that are the basis of the entries are entered and none are missed. Although I am now catching all of the messages, I now find that the list control constantly flickers irritatingly. Is there a way to prevent this flickering? Any ideas are appreciated.

Thanks. Smile | :)

Tomasz Sowinski18-Mar-02 5:43

18-Mar-02 5:43

What messages are you catching? What does it have in common with blocking the redraws of list control?

Tomasz Sowinski -- http://www.shooltz.com

Andrew Stampor18-Mar-02 6:36

Andrew Stampor

18-Mar-02 6:36

The messages are from a queue that is being populated by a program that is external to my application. Essentially, the program is on a network and maintains its own queue of the messages that are being sent on the network. When a message is processed, it is removed from the queue. My application taps into the queue and dumps each entry one-by-one into the list control. Since my app maintains a max size for the list control, when an entry is added to the list control, if it is at the max size, it will first delete the oldest entry and then add the new entry. The reason for the SetRedraw was that the list control was being redrawn both after the delete and the add. The messages in the other application are so quick that my app was missing messages because of this extra redraw.

Now, I no longer miss the messages, but the screen flickers. Any ideas? Confused | :confused:

Tomasz Sowinski18-Mar-02 7:06

18-Mar-02 7:06

Maybe you should switch into virtual list mode (LVS_OWNERDATA style) - you'd keep the strings in your own data structures and list would notify you that it needs repainting. You could even move message retrieval/storing into separate thread.

Tomasz Sowinski -- http://www.shooltz.com

Same caption problem as before, what am I doing wrong?

Andrew Stampor18-Mar-02 10:36

Andrew Stampor

18-Mar-02 10:36

I currently have the message retrieval in a separate thread. I have reservations about changing the structures being used; the application currently works and has gone through the testing process and a structural change would mean more retesting time than is allotted for the project.

If you know of any other way, I would really appreciate it. I was kinda hoping that you would tell me about the little known "StopFlickering()" method.;)

Thanks a lot.

generic_user_id18-Mar-02 5:10

Re: Same caption problem as before, what am I doing wrong?

18-Mar-02 5:10

I'm trying to draw the caption of a dialog myself, but windows keeps painting the button on the caption bar.

Kilowatt said I had to put SetWindowLong(hDlg, DWL_MSGRESULT, FALSE); in the WM_NCACTIVATE handler, but adding that doesn't work with me.

Probably I made a stupid mistake somewhere, or I forgot some obvious code, but simply adding the above code doesn't do anything at all. (SetWindowLong returns 0, when hDlg == m_hDlg)

[edit]
I forgot to mention that I return TRUE in WM_NCACTIVATE
[/edit]

What can I possibly be doing wrong, please help me.

Thanks a lot in advance!

Paul M Watt18-Mar-02 5:32

Paul M Watt

18-Mar-02 5:32

What are you using to develop your code? MFC, SDK, WTL I will post an example.

Also, what exactly are you trying to accomplish, do you want to custom color the caption with different text and whatnot.

Are you trying to custom draw the buttons in the corner?

Re: Same caption problem as before, what am I doing wrong?

generic_user_id18-Mar-02 5:57

Re: Same caption problem as before, what am I doing wrong?

18-Mar-02 5:57

An example would be great! thanks!

I'm using MFC, I need to change the hight of the caption, and therefore I need to paint it myself. Also I'm thinking about moving/drawing the buttons, but that's not as important.

I think that covers about it, and again thanks.

Ravi Bhavnani18-Mar-02 6:21

Ravi Bhavnani

18-Mar-02 6:21

See this article.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Same caption problem as before, what am I doing wrong?

generic_user_id18-Mar-02 6:56

Re: Same caption problem as before, what am I doing wrong?

18-Mar-02 6:56

I read that article, but it didn't help me...

Only the caption of a CView is modified in that example, it's a bit different for a CDialog.

Thanks anyway

Paul M Watt18-Mar-02 7:50

Paul M Watt

18-Mar-02 7:50

I do not have very much time, so here is a code snippet from a WTL dialog example, you should be able to simply translate teh code to MFC. This will not repaint any custom parts, however it will prevent any portion of the borders and caption from being painted.

LRESULT OnNCActivate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
        //Perform your custom activation here.
 
        //This is the key to prevent the caption from being painted 
        //by the system
	::SetWindowLong(m_hWnd, DWL_MSGRESULT, FALSE);
	return TRUE;
}

LRESULT OnNCPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
        //You should call the defDlgProc for here.

        //Preform your custom caption painting here.

return TRUE;
}

Re: Same caption problem as before, what am I doing wrong?

generic_user_id18-Mar-02 9:24

Re: Same caption problem as before, what am I doing wrong?

18-Mar-02 9:24

Thanks for your reply.

I translated this part to mfc, with this as result:

LRESULT CAnothertestDlg::OnNCPaint(WPARAM wParam, LPARAM lParam)
{
	::SetWindowLong(m_hWnd, DWL_MSGRESULT, FALSE);
	return TRUE;
}

LRESULT CAnothertestDlg::OnNCActivate(WPARAM wParam, LPARAM lParam)
{
	return TRUE;
}

This is pretty much the same as what you told me before and I still don't get it working.

I'm getting pretty desperate to get this working....

Paul M Watt18-Mar-02 9:48

Paul M Watt

18-Mar-02 9:48

You have the examples backwards. it should be like this.

LRESULT CAnothertestDlg::OnNCPaint(WPARAM wParam, LPARAM lParam)
{
	return TRUE;
}

LRESULT CAnothertestDlg::OnNCActivate(WPARAM wParam, LPARAM lParam)
{
	::SetWindowLong(m_hWnd, DWL_MSGRESULT, FALSE);
	return TRUE;
}

please run this and let me know what you see. You should see a window where the borders and caption never get painted. The minimize and maximize buttons will however still be painted.

By the way, the custom caption article that somebody else posted loks pretty good, teh key to making this work in the dialog is the SetWindowLong call in WM_NCACTIVATE.

Re: Same caption problem as before, what am I doing wrong?

generic_user_id18-Mar-02 11:06