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Screen Capture to the Clipboard

, 5 Apr 2001
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How do you capture the bitmap of a window? This little download shows how, and places the bitmap on the clipboard.

Introduction

One of the common questions that I find on the microsoft.public forums is "How do I get a bitmap of a window on the screen?" Well, here's a little subroutine I used extensively in writing Win32 Programming, because I realized that for the number of illustrations I wanted for the book, there was no hope of doing screen captures and then hand-editing just the control I wanted to show. So all my Explorers have a little button somewhere that performs a screen capture of the example window and drops it into the clipboard. I could then paste it into the document, or paste it into an editor and save it as a TIFF or JPEG as well.

ToClip.h:

void toClipboard(CWnd * wnd, BOOL FullWnd);

ToClip.cpp

#include "stdafx.h"
#include "toclip.h" 
/****************************************************************
*                                 toClipboard
* Inputs:
*       CWnd * wnd: Window whose contents are to be sent 
*                   to the clipboard
*       BOOL FullWnd: TRUE for entire window, 
*                     FALSE for client area
* Result: void
*       
* Effect: 
*       Copies the contents of the client area or the window
*       to the clipboard in CF_BITMAP format.
*****************************************************************/

void toClipboard(CWnd * wnd, BOOL FullWnd)
    {
     CDC dc;
     if(FullWnd)
        { /* full window */
         HDC hdc = ::GetWindowDC(wnd->m_hWnd);
         dc.Attach(hdc);
        } /* full window */
     else
        { /* client area only */
         HDC hdc = ::GetDC(wnd->m_hWnd);
         dc.Attach(hdc);
        } /* client area only */

     CDC memDC;
     memDC.CreateCompatibleDC(&dc);

     CBitmap bm;
     CRect r;
     if(FullWnd)
        wnd->GetWindowRect(&r);
     else
         wnd->GetClientRect(&r);

     CString s;
     wnd->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);

     wnd->GetParent()->OpenClipboard();
     ::EmptyClipboard();
     ::SetClipboardData(CF_BITMAP, bm.m_hObject);
     CloseClipboard();

     memDC.SelectObject(oldbm);
     bm.Detach();  // make sure bitmap not deleted with CBitmap object
    }

The views expressed in these essays are those of the author, and in no way represent, nor are they endorsed by, Microsoft.

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About the Author

Joseph M. Newcomer

United States United States
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Comments and Discussions

 
QuestionHow can i detect a global screen capture? PinmemberMiguel Lopes27-Oct-03 13:38 
AnswerRe: How can i detect a global screen capture? PinmemberJoseph M. Newcomer2-Nov-03 13:29 
QuestionHow can I print it? PinmemberAlex Evans30-Sep-03 14:32 
GeneralCapturing the whole window PinsussArne Diegenbach25-Sep-03 11:35 
GeneralI rate 5 for this article! Pinmemberxxxyyyzzz12-Feb-03 10:17 
Generalsomething that you don't need PinsussAnonymous10-Oct-02 3:44 
GeneralRe: something that you don't need PinmemberJoseph M. Newcomer10-Oct-02 15:23 
Generalthere's a bug Pinsusspangtao17-Jul-02 17:45 
when I use
wnd = CWnd::GetDesktopWindow();
there's an error caused by
wnd->GetParent()->OpenClipboard();
I have to modify this clause to be following:
wnd->OpenClipboard();
Hmmm | :|
GeneralPossible Resource Leakage PinmemberLim Bio Liong7-Jan-02 22:27 
GeneralRe: Possible Resource Leakage PinmemberDoug Hagerman1-Mar-02 15:49 
GeneralRe: Possible Resource Leakage PinmemberLim Bio Liong1-Mar-02 17:19 
GeneralRe: Possible Resource Leakage PinmemberJoseph M. Newcomer1-Mar-02 20:10 
GeneralRe: Possible Resource Leakage PinmemberJoseph M. Newcomer1-Mar-02 20:03 
GeneralRe: Possible Resource Leakage PinmemberLim Bio Liong2-Mar-02 23:39 
QuestionAn easier way? PinmemberLrdElder6-Jan-02 9:25 
QuestionHow To Capture Mouse Pointer Image Also PinmemberSujeet1-Nov-01 21:41 
AnswerRe: How To Capture Mouse Pointer Image Also PinmemberJoseph M. Newcomer4-Nov-01 6:12 
AnswerRe: How To Capture Mouse Pointer Image Also PinmemberJoseph M. Newcomer4-Nov-01 6:16 
GeneralRe: How To Capture Mouse Pointer Image Also PinmemberKunjan Shah26-Nov-01 21:49 
QuestionHow to capture mediaplayer window ? PinmemberAnonymous4-Sep-01 5:02 
QuestionHow to receive list of Working applications with their windows' handles? PinmemberSash22-Jun-01 23:17 
AnswerRe: How to receive list of Working applications with their windows' handles? PinmemberJoseph M. Newcomer23-Jun-01 6:55 
AnswerRe: How to receive list of Working applications with their windows' handles? PinmemberAmit_0910-Oct-03 0:42 
QuestionResource leaking?? PinmemberAnonymous7-Jun-01 15:28 
Questionhow to capture a menu on the menubar? Pinmemberbenben11-May-01 22:57 

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