C / C++ / MFC

27-Nov-02 0:51

I have an application that has a tab-page on which some controls can be placed. These controls are created in a DLL. When I try to delete these controls from within the DLL I get an assertion failure in the CWnd::DestroyWindow of the controls at ASSERT(m_hWnd == hWndOrig);.
Anyone know how to fix this? ...it is realy anoying me.

<br />
BOOL CWnd::DestroyWindow()<br />
{<br />
	if (m_hWnd == NULL)<br />
		return FALSE;<br />
<br />
	CHandleMap* pMap = afxMapHWND();<br />
	ASSERT(pMap != NULL);<br />
	CWnd* pWnd = (CWnd*)pMap->LookupPermanent(m_hWnd);<br />
#ifdef _DEBUG<br />
	HWND hWndOrig = m_hWnd;<br />
#endif<br />
<br />
#ifdef _AFX_NO_OCC_SUPPORT<br />
	BOOL bResult = ::DestroyWindow(m_hWnd);<br />
#else //_AFX_NO_OCC_SUPPORT<br />
	BOOL bResult;<br />
	if (m_pCtrlSite == NULL)<br />
		bResult = ::DestroyWindow(m_hWnd);<br />
	else<br />
		bResult = m_pCtrlSite->DestroyControl();<br />
#endif //_AFX_NO_OCC_SUPPORT<br />
<br />
	// Note that 'this' may have been deleted at this point,<br />
	//  (but only if pWnd != NULL)<br />
	if (pWnd != NULL)<br />
	{<br />
		// Should have been detached by OnNcDestroy<br />
#ifdef _DEBUG<br />
		ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);<br />
#endif<br />
	}<br />
	else<br />
	{<br />
#ifdef _DEBUG<br />
		ASSERT(m_hWnd == hWndOrig);<br />
#endif<br />
		// Detach after DestroyWindow called just in case<br />
		Detach();<br />
	}<br />
	return bResult;<br />
}<br />

Rage27-Nov-02 1:37

27-Nov-02 1:37

What's the value of bResult before the assertion fails ?

~RaGE();

Brian van der Beek27-Nov-02 1:43

27-Nov-02 1:43

When the assertions fails:

bResult = TRUE
m_hWnd = 0x00000000
hWndOrig = 0x000408e6

Rage27-Nov-02 1:57

27-Nov-02 1:57

I do not understand why it souhld _not_ cause an assertion here. You destroy the window (since bResult is true) so m_hWnd is NULL, so pWnd is NULL, so m_hWnd cannot be equal to m_hWnd since it takes the original value of hWndOrig with HWND hWndOrig = m_hWnd;. Confused | :confused:

I really do not see the point in all this Frown | :(

~RaGE();

Brian van der Beek27-Nov-02 2:04

27-Nov-02 2:04

I cannot figure it out either, some source comment would have been handy. Also, I can not find anything about this problem on the whole damn internet (google search). Frown | :(

I guess I just have to put up with it and try to restain myself from smashing my keyboard.

dabs27-Nov-02 2:44

dabs

27-Nov-02 2:44

Are you using the AFX_MANAGE_STATE( ) macro at the top of the function in the dll that destroys the window?

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

Brian van der Beek27-Nov-02 2:58

List Control in place editing

27-Nov-02 2:58

That's It! I thought I already added it, but I hadn't done so in the destructor. Thanx !

devvvy27-Nov-02 0:36

devvvy

27-Nov-02 0:36

hi, just implemented in-place editing for list control as illustrated by:S.Prabhakarreddy / CodeProject

Reference: http://www.codeproject.com/listctrl/editing_subitems_in_listcontrol.asp

QUESTION 1: How can I use arrow keys (Keyboard) to navigate around the list control?

QUESTION 2: The implementation at the moment is such that you click on a cell, type and press ENTER. But what's better is click, type and press ARROW key. But how? I tried OnKeyDown for the dialog class. But not much luck.

QUESTION 3: Seems like ListView_GetSubItemRect is not doing its job properly... the following is code in message handler for click on list control:

// this macro is used to retrieve the Rectangle
// of the selected SubItem
ListView_GetSubItemRect(
hWnd1,
temp->iItem,
temp->iSubItem,
LVIR_BOUNDS,
&rect);

//Why +13? It's just trial and error. Seems like ListView_GetSubItemRect is not doing its job properly.
::SetWindowPos(::GetDlgItem(m_hWnd,IDC_EDIT1),
HWND_TOP,
rect.left +13, //You need to compensate for the deviation u get from ListView_GetSubItemRect!?!
rect.top +13,
rect.right-rect.left,
rect.bottom-rect.top,
NULL);

Thanks!

norm

Re: List Control in place editing

dabs27-Nov-02 3:04

dabs

27-Nov-02 3:04

If you want to be able to jump between cells using arrow keys you have to intercept them in the editbox itself because the editbox receives the keydown event. I did similar things once (using the TAB key to move between cells) and the code looked something like this:

<br />
<br />
void CInPlaceEdit::OnChar( UINT nChar, UINT nRepCnt, UINT nFlags )<br />
{<br />
  if ( nChar == VK_TAB )<br />
  {<br />
    if ( GetKeyState( VK_SHIFT ) < 0 )<br />
    {<br />
      m_pListCtrlParent->OnPreviousCell( );<br />
    }<br />
    else<br />
    {<br />
      m_pListCtrlParent->OnNextCell( );<br />
    }<br />
  }<br />
}<br />
<br />

where m_pListCtrlParent is a pointer to the parent Listctrl. It contains the method called in the code and these methods basically do this:

- grab the focus (because the edit box knows that it should disappear when it loses focus)
- calculate the next cell to be edited
- initiate the edit for that cell

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

logonuser with CreateProcessAsUser

r i s h a b h s26-Nov-02 23:55

r i s h a b h s

26-Nov-02 23:55

how do i use the LogonUser and CreateProcessAsUser functions together to create processes in windows xp?

Re: logonuser with CreateProcessAsUser

techno_guru27-Nov-02 5:41

techno_guru

27-Nov-02 5:41

The solution here =)

http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q180548

Simplicity is the supreme sophistication.
-------------------------------------------
http://www.borie.org/

Encryption

AJ12326-Nov-02 23:44

AJ123

26-Nov-02 23:44

Hi,

I am storing password with a database table and would like to encrypty them to a reasonable level. Is there any standard windows api function that could help me? relucltant to use a third-party library.

Can anyone offer me any advice.

Cheers
Rich

Re: Encryption

Rage27-Nov-02 1:41

Voice over Internet - HOW

27-Nov-02 1:41

There is a MFC Sample for _file_ encryption, but you won't escape CryptoAPI for passwords, I think.

~RaGE();

Re: Encryption

Scott H. Settlemier27-Nov-02 3:46

Scott H. Settlemier

27-Nov-02 3:46

Just pass the password through a suitable one way hash function
like MD5 or SHA. Store the hash value. When the user enters
password, compute the hash and check against stored value.
The algorithms are pretty easy to just include in your source
files.
example here.[^]

[edit] That assumes you just need to validate entered passwords, not use them... [edit]

Kunal Khairnar26-Nov-02 23:42

Kunal Khairnar

26-Nov-02 23:42

Hi,
What I have to use to develop a stand alone application with which one can VOICE CHAT with other OVER INTERNET

I don't want to use TAPI or DirectPlay or NetMeeting SDK. What are other options with which I can develop Voice Conferencing over Internet application.

Re: Voice over Internet - HOW

Scott H. Settlemier27-Nov-02 4:58

Scott H. Settlemier

27-Nov-02 4:58

Check out the Open H323[^] project.

Dialog in CWinThread

rrrado26-Nov-02 23:25

rrrado

26-Nov-02 23:25

I have a CWinThread derived class CMyThread. I create modalless dialog :

BOOL CManThread::InitInstance()
{
    m_dlg.Create(IDD_DIALOG);
    m_dlg.ShowWindow(SW_SHOW);
    return TRUE;
}

Dialog works fine, but how to notify my thread when dialog is closed, so that i could sent WM_QUIT message to end the thread ?

Thanks

rrrado

Re: Dialog in CWinThread

Rage27-Nov-02 1:32

CListCtrl item editing and OnNotify

27-Nov-02 1:32

You may override OnOK() or OnCancel() function in your dialog class, and send a WM_QUIT at that moment.

~RaGE();

Re: Dialog in CWinThread

rrrado27-Nov-02 4:04

rrrado

27-Nov-02 4:04

thanks, but I tried to call m_thread->PostThreadMessage(WM_QUIT,0,0) inside of OnCancel. But after closing of dialog some Asssertion fails and application crashes.

rrrado

Re: Dialog in CWinThread

Alvaro Mendez27-Nov-02 11:31

Alvaro Mendez

27-Nov-02 11:31

If all your thread does is create the modeless dialog, you don't need the thread at all. Just create the dialog and presto.

Regards,
Alvaro

Well done is better than well said. -- Benjamin Franklin
(I actually prefer medium-well.)

devvvy26-Nov-02 22:49

devvvy

26-Nov-02 22:49

i failed to intercept WM_NOTIFY when i attempt to edit fields of my CListCtrl control in my dialog application..?

Here's my OnNotify code:

BOOL CQGenInstallDlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
// TODO: Add your specialized code here and/or call the base class

//<norman: 27-nov-2002="" handle="" editing="" on="" list="" view="" control="" this-="">m_lvSettingList>
UINT nNotCode = 0; //Notification code.
INT nCtrlID = 0; //wParam
LV_DISPINFO* pDispInfo = NULL; //lParam

pDispInfo = (LV_DISPINFO*) lParam;
nNotCode = pDispInfo->hdr.code;

if(nNotCode==LVN_BEGINLABELEDIT)
{
//Pre-edit processing.

}

if(nNotCode==LVN_ENDLABELEDIT)
{
//Post-edit processing.
UINT itemindex = pDispInfo->item.iItem;
CString newText = pDispInfo->item.pszText;
if(newText!="")
{
this->m_lvSettingList.SetItemText(itemindex, 1, newText);
}
}
//

return CDialog::OnNotify(wParam, lParam, pResult);
}

Hope someone can spot this for me. Thanks!

norm

Re: CListCtrl item editing and OnNotify

Rage26-Nov-02 22:52