Re: How do i know when the mouse leaves an area? - C / C++ / MFC Discussion Boards

ben214-Jun-04 14:11

14-Jun-04 14:11

I found that using PDH these can be done. Was wondering if this can be done for individual processes, from within the program.

HQUERY m_hQuery; // the query to the PDH
PdhOpenQuery(NULL, 1, &m_hQuery);
PdhAddCounter(....)
How to use above function for individual processes?

CDateTimeCtrl

sschilachi14-Jun-04 10:29

sschilachi

14-Jun-04 10:29

I have a Date Time Picker in a toolbar, and I have a derived class of CDateTimeCtrl managing the UI object.

What I want to know is how do I specify which days in the month are bold when the user clicks the dropdown button to select the date?

Any help would be greatly appreciated.

Thanks

Re: CDateTimeCtrl

palbano14-Jun-04 11:15

palbano

14-Jun-04 11:15

You can call CMonthCalCtrl::SetDayState() (MESSAGE: MCM_SETDAYSTATE) to set them or better yet respond to the MCN_GETDAYSTATE message that the control sends when it needs new information. This usually occurs when the month changes.

From my memory, there is an array of 32 bit values where each value represents a month and each bit represents a day. The on BITS cause the day to be bolded in the calendar if it has the MCS_DAYSTATE style set. There is all sorts of documentation on MSDN.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

(Nt)Zw Registry calls

Dan Madden14-Jun-04 9:26

Dan Madden

14-Jun-04 9:26

Hi, I created a class that uses the NtNative APIs found in the ntdll.dll. Everything works except the "Hive File" functions. Below is the "LoadKey" function:

<br />
BOOL CKey::LoadKey(CString csHiveFilePathName, ULONG ulFlags /* 0x0000 */)<br />
{<br />
<br />
	ASSERT(csHiveFilePathName != _T(""));<br />
	ASSERT((m_csRootPath == _T("\\Registry\\User") || <br />
			m_csRootPath == _T("\\Registry\\Machine")));<br />
<br />
	BOOL bSuccess = TRUE;<br />
<br />
	HANDLE hRootKey = NULL, hHiveFile = NULL;<br />
<br />
	NT::UNICODE_STRING usRootKeyName, usHiveFileName, usHiveFile;<br />
    NT::OBJECT_ATTRIBUTES DestinationKeyName, RegHiveFileName, RegHiveFile;<br />
<br />
	int n=0;<br />
<br />
<br />
	// Make sure the filenames is setup correctly<br />
	if (csHiveFilePathName.Left(4) != _T("\\??\\"))<br />
		csHiveFilePathName.Insert(0,_T("\\??\\"));<br />
<br />
	// Enable the restore privilege<br />
	m_NtStatus = EnablePrivilege(SE_RESTORE_NAME, TRUE);<br />
	if(!NT_SUCCESS(m_NtStatus))<br />
	{<br />
		bSuccess = FALSE;<br />
		goto end_it;<br />
	}<br />
<br />
	WCHAR wszHiveFile[1024];<br />
	for (n=0; n<csHiveFilePathName.GetLength(); n++)<br />
		wszHiveFile[n] = (WCHAR)csHiveFilePathName[n];<br />
<br />
	wszHiveFile[n++] = L'\0';<br />
<br />
	usHiveFileName.Buffer = wszHiveFile;<br />
	usHiveFileName.Length = wcslen(wszHiveFile) * sizeof(WCHAR);<br />
<br />
	InitializeObjectAttributes(&RegHiveFileName, &usHiveFileName, <br />
								OBJ_CASE_INSENSITIVE, NULL, NULL );<br />
<br />
	WCHAR wszRootKey[2048];<br />
	for (n=0; n<m_csRootPath.GetLength(); n++)<br />
		wszRootKey[n] = (WCHAR)m_csRootPath[n];<br />
<br />
	wszRootKey[n++] = L'\0';<br />
<br />
	usRootKeyName.Buffer = wszRootKey;<br />
	usRootKeyName.Length = wcslen(wszRootKey) * sizeof(WCHAR);<br />
<br />
	InitializeObjectAttributes(&DestinationKeyName, &usRootKeyName, <br />
								OBJ_CASE_INSENSITIVE, NULL, NULL );<br />
<br />
	if (ulFlags == 0x0000)<br />
	{<br />
		if (m_ntModeType == 0) // UserMode = 0, KernalMode = 1<br />
			m_NtStatus = NT::ZwLoadKey(&DestinationKeyName, &RegHiveFileName);<br />
		else<br />
//			m_NtStatus = NT::NtLoadKey(&DestinationKeyName, &RegHiveFileName);<br />
	}<br />
	else<br />
		m_NtStatus = NT::ZwLoadKey2(&DestinationKeyName, &RegHiveFileName, ulFlags);<br />
<br />
	if (!NT_SUCCESS(m_NtStatus)) <br />
	{<br />
		bSuccess = FALSE;<br />
	}<br />
<br />
end_it:<br />
<br />
	m_csFunction = _T("LoadKey()");<br />
	if (ulFlags == 0x0004)<br />
		m_csFunction = _T("LoadKey(2)");<br />
<br />
	if (!bSuccess) <br />
		Output(DisplayError(m_NtStatus), MB_OK|MB_ICONERROR);<br />
<br />
	// Now remove the privilege (back to its prior state).<br />
	// This is not strictly necessary, since we're going<br />
	// to terminate the process anyway, and the token we've<br />
	// adjusted will be destroyed, but in real life you might<br />
	// have processes that do a little more than this :-)<br />
	m_NtStatus = EnablePrivilege(SE_RESTORE_NAME, FALSE);<br />
<br />
//	NT::ZwClose( hRootKey );<br />
//	NT::ZwClose( hHiveFile );<br />
<br />
	if (!NT_SUCCESS(m_NtStatus)) <br />
	{<br />
		Output(DisplayError(m_NtStatus), MB_OK|MB_ICONERROR);<br />
		m_csFunction = _T("");<br />
		return FALSE;<br />
	}<br />
	else if (!bSuccess) <br />
	{<br />
		m_csFunction = _T("");<br />
		return FALSE;<br />
	}<br />
<br />
	return TRUE;<br />
}<br />

Appreciate any help you can give me!!!

Regards,

Dan

Re: How do i know when the mouse leaves an area?

Maximilien14-Jun-04 8:53

Maximilien

14-Jun-04 8:53

to check if the mouse is outside a CWnd, have a look at TRACKMOUSEEVENT ( with TME_LEAVE ) and _TrackMouseEvent.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: How do i know when the mouse leaves an area?

kfaday14-Jun-04 9:27

kfaday

14-Jun-04 9:27

hmm.. i'm using mfc, that's some winapi stuff.. i never merged both things, tough i know that mfc is over winapi. How could i manage those messages if i can't see them in classwizard?

Re: How do i know when the mouse leaves an area?

Maximilien14-Jun-04 9:45

Maximilien

14-Jun-04 9:45

you can use it with MFC with no problem; the _TrackMouseEvent will generate a WM_MOUSELEAVE event/notification

ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
/// for example I use it on a CView ... 
void CView::OnMouseMove( UINT nFlags, CPoint point ) 
{
 if ( ! ( nFlags & MK_LBUTTON ) )
 {
  if (!m_bTracking)
  {
   TRACKMOUSEEVENT tme;
   tme.cbSize = sizeof(tme);
   tme.hwndTrack = m_hWnd;
   tme.dwFlags = TME_LEAVE;
   m_bTracking =  (_TrackMouseEvent(&tme) == 1 )? true: false;
  }
 }
}

LRESULT CView::OnMouseLeave(WPARAM wparam, LPARAM lparam)
{
 m_bTracking = false;
 return 0;
}

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: How do i know when the mouse leaves an area?

kfaday14-Jun-04 10:32

kfaday

14-Jun-04 10:32

Hi, your code seems like it's going to work, but i don't quite understand it. I added the message and the OnMouseLeave function. That's ok. What i can't understand is what's inside your OMouseMove function.
what i basically want to do is this:

void CAreaPizarra::OnMouseMove(UINT nFlags, CPoint point) 
{

		if ((nFlags == MK_LBUTTON) && (mouse is inside))
		{
			do_one_thing();
		}
		else
			if ((nFlags == MK_LBUTTON) && (mouse is outside))
			{
				do_another_thing();
			}

would you mind explaining me what you did in your function so i can add it in this code?

thanks!

Re: How do i know when the mouse leaves an area?

Johan Rosengren14-Jun-04 9:10

Johan Rosengren

14-Jun-04 9:10

You might for example check http://www.codeproject.com/gdi/mousecapture.asp[^]

There also is info on tracking in http://www.codeproject.com/miscctrl/cmouseaction.asp[^]

Well, in short, search for TrackMouseEvent in the articles.

Re: How do i know when the mouse leaves an area?

toxcct14-Jun-04 11:23

toxcct

14-Jun-04 11:23

have a look at this[^], it can be very interesting for you...

TOXCCT >>> GEII power

Re: How do i know when the mouse leaves an area?

kfaday14-Jun-04 11:59

kfaday

14-Jun-04 11:59

i've solved it with:

ClientToScreen(&this->m_RectArea);
ClipCursor(this->m_RectArea);

Now, how do i unclip the cursor?

Those lines are in OMouseMove, while the lbutton is clicked.
I want to unclip it in OnLButtonUp

how could i do it?
thanks!

Re: How do i know when the mouse leaves an area?

toxcct14-Jun-04 20:46

toxcct

14-Jun-04 20:46

set a flag (a bool) into your class for example.
otherwise, i don't really understand... sorry...

TOXCCT >>> GEII power

Re: How do i know when the mouse leaves an area?

kfaday15-Jun-04 8:12

kfaday

15-Jun-04 8:12

With ClipCursor(Rect); , the mouse is trapped in that rect.
what should i call if i want the mouse to be free!.. so that i can move it over all the screen of my monitor?
something like ClipCursor(desktop) or something like that?

Re: How do i know when the mouse leaves an area?

kfaday15-Jun-04 9:19

kfaday

15-Jun-04 9:19

ClipCursor(NULL) did the job
thanks for reading the question!

Re: How do i know when the mouse leaves an area?

toxcct15-Jun-04 9:20

toxcct

15-Jun-04 9:20

TOXCCT >>> GEII power

How do i know when the mouse leaves an area?

kfaday14-Jun-04 8:46

kfaday

14-Jun-04 8:46

Hi, i'm drawing in a 'CWnd derived' custom control. I want to know which message handles the following event:
When i'm moving the mouse over the control i click the button to insert points over a list. How do i know, when i'm still clicking the left mouse button, that the mouse has 'left' the area. I'm still clicking, but outside the area.
I want to know that, because when you stop clicking the mouse button, a cpoint -1,-1 is sent to the list, so a lineTo isn't drawn to that point.
I get the rect with Getclientrect, but i can't validate with that.
any ideas?

thanks!!

CreateCompatibleBitmap and mem allocation

IGeorgeI14-Jun-04 8:46

IGeorgeI

14-Jun-04 8:46

Hello everyone

I am using CreateCompatibleBitmap to create bitmaps of my list of worksheets. The problem is, when I hit around 20 bitmaps in a loop, the CreateCompatibleBitmap call begins to fail. I have traced into the MFC function calls and I discovered that the memory allocation on the HEAP has reached its limit for creating more resources.

Has anybody ever seen this before??

If not, does anybody have any suggestions??

Thank you for you help

IGeorgeI

George W

Software Developer
www.zsystems.ca

Re: CreateCompatibleBitmap and mem allocation

Johan Rosengren14-Jun-04 9:14

Johan Rosengren

14-Jun-04 9:14

I've seen it when the bitmaps are very large, or leaked. I would try to structure the code so that I didn't need more than one bitmap at any given time, making sure to properly deselect them from any CDC , if appropriate. And, of course, calling DeleteObject , either directly or by having the dtor of the CBitmap invoked.

Re: CreateCompatibleBitmap and mem allocation

Vadim Tabakman14-Jun-04 16:59

Vadim Tabakman

14-Jun-04 16:59

How big are the bitmap sizes?
I used CreateCompatibleBitmap often in code I work with, and have not come across this issue. I very interested in what the bitmap sizes are, that cause the heap to fill up.

thanx

Sending small strings through sockets (lag problem)

kfaday14-Jun-04 7:44

kfaday

14-Jun-04 7:44

Hello.
I'm doing a small drawing application, which is multi-client.
I've implemented a pen. When you press the button and keep the mouse pressed you insert CPoints in a list, and i create a string with the points and send it with the socket.
The problem is, that i'm sending many points a second (i send in OnMouseMove) and the other user receives them, but sometimes not in order.
For example i send a,b,c,d,e,f and the user receives a,b,d,c,e,f.
How could i solve that? i tought of a buffer of ten points, so when ten points are written, a string with points is sent, to avoid the order problem.
i am sure somebody has had this problem before (or something similar).. what could i do?

thanks!!!

Re: Sending small strings through sockets (lag problem)

Ravi Bhavnani14-Jun-04 8:58

Ravi Bhavnani

14-Jun-04 8:58

I suggest sending the array of points when the user releases the mouse.

/ravi

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

Re: Sending small strings through sockets (lag problem)

gamitech14-Jun-04 9:10

gamitech

14-Jun-04 9:10

My suggestion would be this:

try to monitor the sent string and when the client reveives something just send it back and check what he has reveived. If it is the correct string pass on to the next if not send the client a string telling him that he should wait for another string.
This might make even more lag but at least you will know you got it right.

gabby

Re: Sending small strings through sockets (lag problem)

kfaday14-Jun-04 9:32

kfaday

14-Jun-04 9:32

well, i should have explained the scenario better. It's a jabber client, something like msn messenger. I send the strings to the server, and the server sends the strings to the other client.
that's why i have the order problem. Every point is sent, so there are no errors when i send them.

javi's idea is fine i think.

How to capture "network cable unplugged" event

bikram singh14-Jun-04 7:43

bikram singh

14-Jun-04 7:43

Is it possible to capture the "network cable unplugged" event that appears in a balloon tip on the notification area in Windows NT 5+?

I tried by making a thread to monitor the appearance of the balloon, but I cant get it to work.

Is there a better way of doing this??

Bikram Singh

Re: How to capture "network cable unplugged" event

David Crow14-Jun-04 8:49

David Crow

14-Jun-04 8:49

Rather than bother with a tooltip that may or not may not be available, go directly to the source.

On a WAN (e.g., VPN), you can use SENS, specifically the ISensNetwork interface. If it is a LAN, you'd need to use WSAIoctl(SIO_ADDRESS_LIST_CHANGE).

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.