Click here to Skip to main content
11,639,305 members (64,979 online)
Click here to Skip to main content

Screen Capture to the Clipboard

, 5 Apr 2001 312.4K 90
Rate this:
Please Sign up or sign in to vote.
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.

Send mail to newcomer@flounder.com with questions or comments about this article.
Copyright © 1999 All Rights Reserved
www.flounder.com/mvp_tips.htm

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

Share

About the Author

Joseph M. Newcomer
Retired
United States United States
PhD, Computer Science, Carnegie Mellon University, 1975
Certificate in Forensic Science and the Law, Duquesne University, 2008

Co-Author, [i]Win32 Programming[/i]

You may also be interested in...

Comments and Discussions

 
GeneralTake a snapshot of a hidden window Pin
Member 368961631-Mar-08 3:39
memberMember 368961631-Mar-08 3:39 
GeneralRe: Take a snapshot of a hidden window Pin
Joseph M. Newcomer31-Mar-08 4:02
memberJoseph M. Newcomer31-Mar-08 4:02 
GeneralRe: Take a snapshot of a hidden window Pin
Member 368961631-Mar-08 4:58
memberMember 368961631-Mar-08 4:58 
GeneralRe: Take a snapshot of a hidden window Pin
Joseph M. Newcomer31-Mar-08 7:53
memberJoseph M. Newcomer31-Mar-08 7:53 
GeneralRe: Take a snapshot of a hidden window Pin
Member 368961631-Mar-08 8:20
memberMember 368961631-Mar-08 8:20 
GeneralRe: Take a snapshot of a hidden window Pin
Joseph M. Newcomer31-Mar-08 12:43
memberJoseph M. Newcomer31-Mar-08 12:43 
GeneralCapture MineSweeper Window Pin
SwimmerDave20-Jun-06 7:32
memberSwimmerDave20-Jun-06 7:32 
GeneralRe: Capture MineSweeper Window Pin
vikrant kpr25-Jan-08 0:25
membervikrant kpr25-Jan-08 0:25 
GeneralOther bitmap formats Pin
NeWi13-Oct-05 7:14
memberNeWi13-Oct-05 7:14 
GeneralRe: Other bitmap formats Pin
NeWi13-Oct-05 7:35
memberNeWi13-Oct-05 7:35 
GeneralRe: Other bitmap formats Pin
Joseph M. Newcomer18-Oct-05 7:46
memberJoseph M. Newcomer18-Oct-05 7:46 
Generalwindows on top interfere Pin
bbrehm0430-Aug-05 16:10
memberbbrehm0430-Aug-05 16:10 
GeneralRe: windows on top interfere Pin
Joseph M. Newcomer5-Sep-05 16:07
memberJoseph M. Newcomer5-Sep-05 16:07 
GeneralRe: windows on top interfere Pin
bbrehm046-Sep-05 14:13
memberbbrehm046-Sep-05 14:13 
GeneralCapture in Win32 - code Pin
powerpop30-Jun-05 16:20
memberpowerpop30-Jun-05 16:20 
once you have an hwnd for the window you want to get an image of:


RECT rc;
GetWindowRect(hWnd, &rc);

Bitmap* bmp = new Bitmap(rc.right-rc.left, rc.bottom-rc.top);

// create a graphics object from the bitmap
Graphics* gfxBitmap = Graphics::FromImage(bmp);

// get a device context for the bitmap
HDC hdcBitmap = gfxBitmap->GetHDC();

// get a device context for the window
HDC hdcWindow = GetWindowDC(hWnd);

// bitblt the window to the bitmap
BitBlt(hdcBitmap, 0, 0, rc.right-rc.left, rc.bottom-rc.top,
hdcWindow, 0, 0, SRCCOPY);

// release the bitmap's device context
gfxBitmap->ReleaseHDC(hdcBitmap);

ReleaseDC(hWnd, hdcWindow);



at the end you have bmp to either save as a file or to the clipboard
QuestionHow to send captured screen shot through a socket? Pin
bijut6-May-05 7:39
memberbijut6-May-05 7:39 
AnswerRe: How to send captured screen shot through a socket? Pin
James R. Twine6-May-05 8:18
memberJames R. Twine6-May-05 8:18 
AnswerRe: How to send captured screen shot through a socket? Pin
Joseph M. Newcomer6-May-05 11:31
memberJoseph M. Newcomer6-May-05 11:31 
AnswerRe: How to send captured screen shot through a socket? Pin
jags_vc8-May-05 22:52
memberjags_vc8-May-05 22:52 
Questionhow to get image in memory? Pin
jags_vc25-Feb-05 1:00
memberjags_vc25-Feb-05 1:00 
AnswerRe: how to get image in memory? Pin
Joseph M. Newcomer25-Feb-05 6:18
memberJoseph M. Newcomer25-Feb-05 6:18 
GeneralRe: how to get image in memory? Pin
jags_vc27-Feb-05 18:13
memberjags_vc27-Feb-05 18:13 
GeneralRe: how to get image in memory? Pin
Joseph M. Newcomer27-Feb-05 22:02
memberJoseph M. Newcomer27-Feb-05 22:02 
GeneralRe: how to get image in memory? Pin
jags_vc7-Mar-05 1:13
memberjags_vc7-Mar-05 1:13 
GeneralRe: how to get image in memory? Pin
Joseph M. Newcomer9-Mar-05 10:40
memberJoseph M. Newcomer9-Mar-05 10:40 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

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

| Advertise | Privacy | Terms of Use | Mobile
Web03 | 2.8.150728.1 | Last Updated 6 Apr 2001
Article Copyright 2001 by Joseph M. Newcomer
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid