Re: Copying Bitmap
Create a sample MFC dialog app.
On the dialog place two buttons, "Copy Window" and "Copy Client".
Also place a static Image control and create its corresponding variable
m_picture in the dialog class. Using Wizard, it'll generate something like
CStatic m_picture;
in the dialog definition.
Define the following function in the dialog:
p[ublic/rotected/rivate]:
void CMyDlg::CopyWindowAreaToStatic( CDC& cdc )
{
CClientDC dcStatic( &m_picture );
CRect rcStatic;
m_picture.GetClientRect( rcStatic );
dcStatic.BitBlt( 0, 0, rcStatic.Width(), rcStatic.Height(), &cdc, 0, 0,
SRCCOPY );
}
Handle two button clicks for Copying window and client area:
void CMyDlg::OnBnClickedButtonwindow()
{
// TODO: Add your control notification handler code here
CopyWindowAreaToStatic( CWindowDC( this ) );
}
void CMyDlg::OnBnClickedButtonclient()
{
// TODO: Add your control notification handler code here
CopyWindowAreaToStatic( CClientDC( this ) );
}
Done...
"Charles Tam" <CharlesTam@discussions.microsoft.com> wrote in message
news:969926C2-418B-4598-BDE9-1BAA3941DC5F@microsoft.com...
I'm trying to copy the bitmap onto a CStatic object for display purposes
insteads of the clipboard. Unfortunately, I cannot got it to work. How
could I correct it?
/////////////////////////////////
CDC dc;
HDC hdc;
hdc = ::GetWindowDC(this->m_hWnd);
dc.Attach(hdc);
CDC memDC;
memDC.CreateCompatibleDC(&dc);
CBitmap bm;
CRect r;
this->GetWindowRect(&r);
CString s;
this->GetWindowText(s);
CSize sz(r.Width(), r.Height());
bm.CreateCompatibleBitmap(&dc, sz.cx, sz.cy);
CBitmap * oldbm = memDC.SelectObject(&bm);
memDC.BitBlt(0, 0, sz.cx, sz.cy, &dc, 0, 0, SRCCOPY);
m_copy.SetBitmap(bm); // display the bitmap onto a CStatic object
memDC.SelectObject(oldbm);
bm.Detach();
::ReleaseDC(this->m_hWnd, dc.Detach());
/////////////////////////////////
"Ashot Geodakov" wrote:
There are also nice classes like CWindowDC and CClientDC available, why
go
through all this Attach(), Detach() and ReleaseDC() ?
"Charles Tam" <CharlesTam@discussions.microsoft.com> wrote in message
news:064C6EBA-A49D-4873-973F-843F781B702B@microsoft.com...
Hi Joseph, I've tried your code
"http://www.flounder.com/screencapture.htm"
in an example MFC app (VS6 C++).
Unfortunately, the compiler has returned an error on the line
"::ReleaseDC(dc.Detach());" with an error message of "error C2660:
'ReleaseDC' : function does not take 1 parameters".
Could you please tell me how to correct it?
"Joseph M. Newcomer" wrote:
It captures whatever pixels are on the screen.
joe
On Fri, 1 Jun 2007 11:43:01 -0700, Charles Tam
<CharlesTam@discussions.microsoft.com>
wrote:
Thanks for your reply and reference information.
I've another question on screen capturing.
For example, my MFC app contains a Windows Media Player ActiveX
control
and
is displaying a video session. Could I try out your screen capture
technique to copy the current video frame on the control into a
CBitmap
object?
"Joseph M. Newcomer" wrote:
Depends on how the data is created and whether or not all
information
is displayed on the
screen.
For example, see my essay on Screen Capture on my MVP Tips site.
But
this only works if
the image contains everything you need to see, and is not obscured
by
other windows. If
the actual image is is larger, then what you would have to do is
create a memory DC,
select a bitmap into it, and then call your OnDraw handler to write
into the bitmap. The
catch here is that you have to know how large to make the bitmap,
which means that you
will somehow have to track this. One way to handle this is to
simply
call OnDraw with the
default (one-pixel) bitmap and track the largest physical pixel
coordinate you write
(taking into account mapping modes), then create a bitmap, call
OnDraw
again, only this
time with a correctly-sized correct-color-depth bitmap selected in.
Unless you have an
independent way to compute the bitmap size, this may be the only
solution that works.
joe
On Thu, 31 May 2007 23:55:00 -0700, Charles Tam
<CharlesTam@discussions.microsoft.com>
wrote:
I've a CWnd derived class e.g. CWMPPlayer4.
How do I copy the current displayed data from the CMPPlayer4
object
into a
CBitmap object?
Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm
Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm
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