C / C++ / MFC Discussion Boards

First Prev Next

Re: CRgn::DeleteObject

WynApse13-May-01 6:43

WynApse

13-May-01 6:43

Thanks for your response, Igor, except I'll give you a quote from my posting:

"I might add that the regions are NOT selected into any device contexts or attached to any windows at the time they're being deleted."

Dave Campbell

Skinning Specialist
Touch Technology Int.

Re: CRgn::DeleteObject

Andrew Peace13-May-01 13:25

Andrew Peace

13-May-01 13:25

It seems to me as though it has nothing at all to do with the regions. Are you sure that the handle count is increasing when you are creating the regions. Also, remember when you use DC's you must do this;

void MyFunc( )
{
   CPaintDC pdc(this);
   CBrush b(RGB(0,0,0))

   CBrush *pOldBrush = pdc.SelectObject(&b); // MUST STORE OLD POINTER

   // --> USE YOUR BRUSH HERE (or whatever kind of object you'ev select in

   pdc.SelectObject(pOldBrush); // SO YOU CAN RESTORE IT HERE
}

If you don't reselect the old pens, brushes etc. into the device context then they will not be deleted when their destructor is called.

Hope that helps,
Andrew.

Excute program from a memory block

11-May-01 9:57

I store an exe image in my program as a resource,then I load this block in the memory but now I want to execute this exe block wihout need to write it in exe file

Confused | :confused:

Re: Excute program from a memory block

Andrew Peace13-May-01 13:28

Andrew Peace

13-May-01 13:28

Not too sure about this one, but (and I'm sure someone will verify the correctness of this for me) instead of doing what you said can you not just use ShellExecute with the 'res:' protocol?

> Andrew.

CRecordset GetRecordCount

Dave Carkeet11-May-01 9:14

Dave Carkeet

11-May-01 9:14

Ive found myself on more than one ocassion writing code in MFC which imlements a database query using a CRecordset, and churns through the records one at a time doing something to each record.

This type of operation is typically time consuming, and therefore I would like to present the user with a percentage complete indicator (Progress Bar).

My problem of course is that I dont know the size of the record set
a priori (GetRecordCount returns only the highest numbered record so far accessed). Of course I dont want to churn thru the record set before hand to determine its size.

Any ideas on an elegant way to attack this? Other ways to produce satisfactory progress feedback to the user?

Thanks very much in advance!
Smile | :)

Dave Carkeet,
Santiago, Chile

Re: CRecordset GetRecordCount

Tomasz Sowinski11-May-01 9:30

Tomasz Sowinski

11-May-01 9:30

Ok, so MoveLast before GetRecordCount is not an option. Seems that percentage is absolutely necessary you need to perform query with 'SELECT COUNT(*)' and identical WHERE clause before traversing the recordset. Of course, number of records could change between two queries in multi-user scenario, so value returned from first query should be treated with care. COUNT(*) can also be pretty expensive, depending on WHERE.

I don't know your exact requirements, but maybe it's enough to just display a message like 'Please wait, processed 19002 records so far...'.

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

Tree Control Question

Richard Cheng11-May-01 6:31

Richard Cheng

11-May-01 6:31

I have the following tree:
.ABC
.|_A
.|_B
.|_C

.XYZ
.|_X
...|_XX
.|_Y
.|_Z

I want to display something when i use a mouse to click on particular item. How to do that?
For example, if I highlight XX, then pop up a message box say "XX"....etc...

Thanks

Re: Tree Control Question

Tomasz Sowinski11-May-01 6:38

Tomasz Sowinski

11-May-01 6:38

Handle the NM_CLICK notification. You can implement the handler in the parent dialog box or (using message reflection) in CTreeCtrl-derived class.

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

Re: Tree Control Question

Richard Cheng11-May-01 7:27

Richard Cheng

11-May-01 7:27

Thanks for your reply.

I know I can use NM_CLICK, but I don't know which function in CTreeCtrl i should use. Seems liked they just return a HTREEITEM variable. The following is how i make a tree:

HTREEITEM ABC, XYZ, node;

ABC = m_Tree.InsertItem("ABC", TVI_ROOT);
node = m_Tree.InsertItem("A", ABC);
node = m_Tree.InsertItem("B", ABC);
...etc...
if I want to choose B...but it returns a HTREEITEM....how can i know which "node"....

Re: Tree Control Question

Tomasz Sowinski11-May-01 7:40

Tomasz Sowinski

11-May-01 7:40

Use GetMessagePos and CTreeCtrl::HitTest. Assuming that you're handling NM_CLICK in CTreectrl-derived object, you'd write your code like this:

CPoint pt = ::GetMessagePos();
ScreenToClient(&pt);
UINT flags;
HTREEITEM hItem;
hItem = HitTest(pt, &flags);

And do whatever you want with hItem and flags.

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

Re: Tree Control Question

netsky12-May-01 22:48

netsky

12-May-01 22:48

Please use TVN_SELCHANGED,

ON_NOTIFY_REFLECT(TVN_SELCHANGED, OnSelchanged)

OnSelchanged is a Function.

welcome you to Sky...

How to detect subdirectories

11-May-01 5:52

e.g I have a variable CString path;

How can I find out the subdirectories of this folder?

Re: How to detect subdirectories

l a u r e n11-May-01 5:58

l a u r e n

11-May-01 5:58

look at FindFirstFile() FindNextFile()
its in the returned flags value

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Re: How to detect subdirectories

11-May-01 6:13

Thanks!

can I use FILE_ATTRIBUTE_DIRECTORY in the WIN32_FIND_DATA structure, to find subdirectories?

One more question: these functions return a handle. How can I find out what the name of the directories is?

Re: How to detect subdirectories

l a u r e n11-May-01 21:11

l a u r e n

11-May-01 21:11

as far as i remember the cFileName member holds the file / directory name
Smile | :)

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Re: How to detect subdirectories

netsky12-May-01 22:53

netsky

12-May-01 22:53

WIN32_FIND_DATA is a struct:

typedef struct _WIN32_FIND_DATA {
DWORD dwFileAttributes;
FILETIME ftCreationTime;
FILETIME ftLastAccessTime;
FILETIME ftLastWriteTime;
DWORD nFileSizeHigh;
DWORD nFileSizeLow;
DWORD dwReserved0;
DWORD dwReserved1;
TCHAR cFileName[ MAX_PATH ];
TCHAR cAlternateFileName[ 14 ];
} WIN32_FIND_DATA, *PWIN32_FIND_DATA;

this is in MSDN

welcome you to Sky...

Microsoft Money Framework -

11-May-01 5:17

I've noticed that Microsoft is building their commercial products (Money, Encarta, Tax..) using a completely flat look that resembles a web page and it seems to me that they are using a set of controls/views not included in VC++ 6. Does anybody knows were this framework comes from? Confused | :confused:

Jose Lago

Re: Microsoft Money Framework -

Andrew Peace13-May-01 13:30

Andrew Peace

13-May-01 13:30

Not all of them use that style, but how they are implemented differs. I don't have Encarta to hand at the moment, but you could try using Spy++ on it. Money 2000 (and 98 I think) is just a basic web-browser shell and the pages are actually HTML.

> Andrew.

Hangining up the modem

11-May-01 3:28

What is the best way to hang up the modem in JP Naughter's lib or in the Win32 API?

Currently, I'm trying the +++ATH0 trick which is evidently not reliable.

Can it be as simple as closing the port? Is that reliable?

Thanks in Advance!

Re: Hangining up the modem

Ghazi H. Wadi11-May-01 8:43

Ghazi H. Wadi

11-May-01 8:43

RasEnumConnections()
Then call
RasHangUp ()

Cheers
Alfadhly

It is Illogical to define an inventor by his invention

Press a key in a MFC ActiveX control

11-May-01 3:12

I wrote a MFC ActiveX control with the Wizard. I want to do something when
the user press a key and the control has the focus, so I wrote:

void CMyControlCtrl::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
AfxMessageBox("Key pressed") ;
COleControl::OnChar(nChar, nRepCnt, nFlags);
}

Now if I insert the control in a Visual Basic Form it works right, but if I
insert it in the dialog of a MFC Dialog based application it doesn't work.

Can someone help me?
Thanks Paolo

Re: Press a key in a MFC ActiveX control

chenzhu11-May-01 4:08

chenzhu

11-May-01 4:08

I think that you need do some thing at the control PreTranslateAccelerator method
function like following code.

BOOL CInPlaceEdit::PreTranslateAccelerator(LPMSG pMsg, HRESULT& hRet)
{
if( ( pMsg->message == WM_KEYDOWN || pMsg->message == WM_KEYUP ) &&
( pMsg->wParam == VK_LEFT || pMsg->wParam == VK_RIGHT ||
pMsg->wParam == VK_UP || pMsg->wParam == VK_DOWN || pMsg->wParam == VK_TAB) )
{
hRet = S_FALSE;
return TRUE;
}

return FALSE;
}
Cool | :cool:

Re: Press a key in a MFC ActiveX control

11-May-01 4:47

Thanks for your answer, I'm not an expert on MFC and I didn't find any documentation on PreTranslateAccelerator and how to use it so I'm not so good to try your advice. I'm not sure that the problem is on Accelerator because in VB it works fine.
To try my problem just create a new MFC ActiveX ControlWizard (in the second windows check the "Available in "Insert object" dialog") then add the Window message handler WM_CHAR like in my previous message. Now compile and register it. Try to insert in a VB form and in a Dialog based MFC program.
Thanks in advance. Paolo

Re: Press a key in a MFC ActiveX control

chenzhu11-May-01 18:22

chenzhu

11-May-01 18:22

Yes, PreTranslateAccelerator is for ATL control and you can use PreTranslateMessage method
as the another person's suggest.

Please read MSDN following article:
PRB: MFC ActiveX Control Ignores ARROW Keys on VB Container
Good Luck!

Re: Press a key in a MFC ActiveX control

13-May-01 21:12

I read the article that you suggest me. But my problem isn't about the accelerator keys, I have the problem with each kind of keys. It seems that the control hasn't the focus (or something similar). If you read the article "MFC ActiveX Control in IE Doesn't Detect Keystrokes" (Q168777) they speak about the activation of the control within IE. I tried their suggestions but I didn't solve my problem. If you have time to check just create an MFC ActiveX control with the wizard (confirm all the default properties and set the "available in insert object dialog"), then add the function OnChar (WM_CHAR) and write inside it AfxMessageBox("Key pressed"). Now insert the object in a VB form and it works, but if you insert in a VC MFC dialog based application (with the wizard) it doesn't work.
I'm using Visual Studio 6.0.
Thanks Paolo.
Confused | :confused:

Last Visit: 31-Dec-99 18:00 Last Update: 8-Jun-24 2:54

Refresh

ᐊ Prev 1...18354 18355 18356 183571835818359 18360 18361 18362 18363 Next ᐅ

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