CListCtrl in CListView and screen font question
David Harvey -- dharvey@aros.net
Friday, January 17, 1997
Environment: VC4.2b NT 4.0 Win 95
I am using the CListView in report mode in an MDI
doc/view application. I needed to access the font
used to display the CListCtrl's item and subitems
in OnBeginPrinting() in my view class directly
derived from CListView. I finally got the
font information needed but it seems to me there
must be an easier way.
First I tried:
CDC *pCtrlDC = GetListCtrl().GetDC();
TEXTMETRIC tmCtrl;
pCtrlDC->GetTextMetrics(&tmCtrl);
This returns the font used to display window title
of the child window hosting the list view!
Then I tried:
HFONT hFont = (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
CFont * pCtrlFont;
pCtrlFont->FromHandle(hFont);
LOGFONT lf;
pCtrlFont->GetLogFont(&lf);
This caused an assertion at the GetLogFont() call
CGdiObject::m_hObject == NULL.
After several other permutations of the above methods
this finally worked:
HFONT hCtrlFont = (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
LOGFONT lf;
BOOL bReturn = ::GetObject(hCtrlFont, sizeof(LOGFONT), &lf);
Anyone care to elaborate?
Thanks,
David Harvey, Developer, Wasatch Interactive Learning, Inc.
dharvey@aros.net, Business Account
harvey@aros.net, Private Account
Syed -- sxs296@psu.edu
Monday, January 20, 1997
[Mini-digest: 3 responses]
>
>Then I tried:
> HFONT hFont = (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> CFont * pCtrlFont;
> pCtrlFont->FromHandle(hFont);
> LOGFONT lf;
> pCtrlFont->GetLogFont(&lf);
>
>This caused an assertion at the GetLogFont() call
>CGdiObject::m_hObject == NULL.
>
>After several other permutations of the above methods
>this finally worked:
>
> HFONT hCtrlFont = (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> LOGFONT lf;
> BOOL bReturn = ::GetObject(hCtrlFont, sizeof(LOGFONT), &lf);
>
>Anyone care to elaborate?
Actually the correct way using FromHandle is like this:-
pCtrlFont = CFont::FromHandle(hFont);
then do whatever you want. If you browse through the online documentation,
the member function FromHandle is declared as static from which you can
guess the correct usage.
Or, you can think of the error this way - pCtrlFont itself is not
initialized yet, so it's incorrect to use it right away (pCtrlFont->FromHandle).
And one more thing, the variable pCtrlFont is safe to be used for a short
period - probably within the function. Therefore, it should be declared as a
local variable rather than member function of a class (eg your derived
CFileView).
-----From: Amir Shoval
I have an owner drawn CListView and I use the following code in my
MeasureItem method:
LOGFONT lf;
CFont* pFont =3D GetFont ();
pFont->GetLogFont (&lf);
lpmis->itemHeight =3D abs ((int) lf.lfHeight) + 6;
and it works OK. I can't see a reason it won't be good for what you
need.
Amir
--------------------------------------
Amir Shoval N.C.C.=20
amirs@ncc.co.il
--------------------------------------
>----------
>From: David Harvey[SMTP:dharvey@aros.net]
>Sent: =E9=E5=ED =F9=E9=F9=E9 17 =E9=F0=E5=E0=F8 1997 20:12
>To: MFC List
>Subject: CListCtrl in CListView and screen font question
>
>Environment: VC4.2b NT 4.0 Win 95
>
>I am using the CListView in report mode in an MDI
>doc/view application. I needed to access the font
>used to display the CListCtrl's item and subitems =20
>in OnBeginPrinting() in my view class directly
>derived from CListView. I finally got the=20
>font information needed but it seems to me there=20
>must be an easier way. =20
>
>First I tried:
> CDC *pCtrlDC =3D GetListCtrl().GetDC();
> TEXTMETRIC tmCtrl;
> pCtrlDC->GetTextMetrics(&tmCtrl);
>
>This returns the font used to display window title=20
>of the child window hosting the list view! =20
>
>Then I tried:
> HFONT hFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> CFont * pCtrlFont;
> pCtrlFont->FromHandle(hFont);
> LOGFONT lf;
> pCtrlFont->GetLogFont(&lf);
>=09
>This caused an assertion at the GetLogFont() call=20
>CGdiObject::m_hObject =3D=3D NULL. =20
>
>After several other permutations of the above methods
>this finally worked:
>
> HFONT hCtrlFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> LOGFONT lf;
> BOOL bReturn =3D ::GetObject(hCtrlFont, sizeof(LOGFONT), &lf);
>
>Anyone care to elaborate?
>Thanks,=20
>
>David Harvey, Developer, Wasatch Interactive Learning, Inc.=20
>dharvey@aros.net, Business Account
>harvey@aros.net, Private Account
>
-----From: David Little
HFONT hFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
CFont * pCtrlFont;
pCtrlFont->FromHandle(hFont);
LOGFONT lf;
pCtrlFont->GetLogFont(&lf);
>> Why didn't you try pCtrlFont =3D CFont::FromHandle(hFont); ? I dont =
think that pCtrlFont->FromHandle() will do anything except ASSERT...I am =
actually surprised that it didn't fail in FromHandle, since it is an =
uninitialized pointer.
Dulepov Dmitry -- dima@ssm6000.samsung.ru
Wednesday, January 22, 1997
[Mini-digest: 2 responses]
[Mailer: "Groupware E-Mail". Version 1.03.000]
>From: David Harvey[SMTP:dharvey@aros.net]
>Subject: CListCtrl in CListView and screen font question
>
>I am using the CListView in report mode in an MDI
>doc/view application. I needed to access the font
>used to display the CListCtrl's item and subitems =20
>in OnBeginPrinting() in my view class directly
>derived from CListView. I finally got the=20
>font information needed but it seems to me there=20
>must be an easier way. =20
>
>First I tried:
> CDC *pCtrlDC =3D GetListCtrl().GetDC();
> TEXTMETRIC tmCtrl;
> pCtrlDC->GetTextMetrics(&tmCtrl);
>
>This returns the font used to display window title=20
>of the child window hosting the list view! =20
>
>Then I tried:
> HFONT hFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> CFont * pCtrlFont;
> pCtrlFont->FromHandle(hFont);
> LOGFONT lf;
> pCtrlFont->GetLogFont(&lf);
>
>This caused an assertion at the GetLogFont() call=20
>CGdiObject::m_hObject =3D=3D NULL. =20
>
>After several other permutations of the above methods
>this finally worked:
>
> HFONT hCtrlFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> LOGFONT lf;
> BOOL bReturn =3D ::GetObject(hCtrlFont, sizeof(LOGFONT), &lf);
>
>Anyone care to elaborate?
I just received mini-digest (I have no original message).
1. If CWnd::GetFont() returns NULL, it is very likely that you have NULL hFont returned from SendMessage(WM_GETFONT). CFont::FromHandle will also return NULL.
2. This code is incorrect:
> HFONT hFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> CFont * pCtrlFont;
> pCtrlFont->FromHandle(hFont);
> LOGFONT lf;
> pCtrlFont->GetLogFont(&lf);
FromHandle() returns a pointer to CFont but not attaches 'hFont' to your 'pCtrlFont'. Use
pCtrlFont = CFont::FromHandle(hFont);
and check result for NULL pointer. If it is NULL - you have no font.
Dmitry A. Dulepov
Samsung Electronics Co., Ltd.
Russian Research Center
Phone: +7 (095) 213-9207
Fax: +7 (095) 213-9196
E-mail: dima@src.samsung.ru
====================================
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Date: Mon, 20 Jan 1997 12:23:57 +0800
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From: Syed
Subject: Re: CListCtrl in CListView and screen font question
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[Mini-digest: 3 responses]
>
>Then I tried:
> HFONT hFont = (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> CFont * pCtrlFont;
> pCtrlFont->FromHandle(hFont);
> LOGFONT lf;
> pCtrlFont->GetLogFont(&lf);
>
>This caused an assertion at the GetLogFont() call
>CGdiObject::m_hObject == NULL.
>
>After several other permutations of the above methods
>this finally worked:
>
> HFONT hCtrlFont = (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> LOGFONT lf;
> BOOL bReturn = ::GetObject(hCtrlFont, sizeof(LOGFONT), &lf);
>
>Anyone care to elaborate?
Actually the correct way using FromHandle is like this:-
pCtrlFont = CFont::FromHandle(hFont);
then do whatever you want. If you browse through the online documentation,
the member function FromHandle is declared as static from which you can
guess the correct usage.
Or, you can think of the error this way - pCtrlFont itself is not
initialized yet, so it's incorrect to use it right away (pCtrlFont->FromHandle).
And one more thing, the variable pCtrlFont is safe to be used for a short
period - probably within the function. Therefore, it should be declared as a
local variable rather than member function of a class (eg your derived
CFileView).
-----From: Amir Shoval
I have an owner drawn CListView and I use the following code in my
MeasureItem method:
LOGFONT lf;
CFont* pFont =3D GetFont ();
pFont->GetLogFont (&lf);
lpmis->itemHeight =3D abs ((int) lf.lfHeight) + 6;
and it works OK. I can't see a reason it won't be good for what you
need.
Amir
--------------------------------------
Amir Shoval N.C.C.=20
amirs@ncc.co.il
--------------------------------------
>----------
>From: David Harvey[SMTP:dharvey@aros.net]
>Sent: =E9=E5=ED =F9=E9=F9=E9 17 =E9=F0=E5=E0=F8 1997 20:12
>To: MFC List
>Subject: CListCtrl in CListView and screen font question
>
>Environment: VC4.2b NT 4.0 Win 95
>
>I am using the CListView in report mode in an MDI
>doc/view application. I needed to access the font
>used to display the CListCtrl's item and subitems =20
>in OnBeginPrinting() in my view class directly
>derived from CListView. I finally got the=20
>font information needed but it seems to me there=20
>must be an easier way. =20
>
>First I tried:
> CDC *pCtrlDC =3D GetListCtrl().GetDC();
> TEXTMETRIC tmCtrl;
> pCtrlDC->GetTextMetrics(&tmCtrl);
>
>This returns the font used to display window title=20
>of the child window hosting the list view! =20
>
>Then I tried:
> HFONT hFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> CFont * pCtrlFont;
> pCtrlFont->FromHandle(hFont);
> LOGFONT lf;
> pCtrlFont->GetLogFont(&lf);
>=09
>This caused an assertion at the GetLogFont() call=20
>CGdiObject::m_hObject =3D=3D NULL. =20
>
>After several other permutations of the above methods
>this finally worked:
>
> HFONT hCtrlFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
> LOGFONT lf;
> BOOL bReturn =3D ::GetObject(hCtrlFont, sizeof(LOGFONT), &lf);
>
>Anyone care to elaborate?
>Thanks,=20
>
>David Harvey, Developer, Wasatch Interactive Learning, Inc.=20
>dharvey@aros.net, Business Account
>harvey@aros.net, Private Account
>
-----From: David Little
HFONT hFont =3D (HFONT) GetListCtrl().SendMessage(WM_GETFONT);
CFont * pCtrlFont;
pCtrlFont->FromHandle(hFont);
LOGFONT lf;
pCtrlFont->GetLogFont(&lf);
>> Why didn't you try pCtrlFont =3D CFont::FromHandle(hFont); ? I dont =
think that pCtrlFont->FromHandle() will do anything except ASSERT...I am =
actually surprised that it didn't fail in FromHandle, since it is an =
uninitialized pointer.
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