Solved

Extract a CBitmap from a CImageList

Posted on 1998-04-17
2
1,274 Views
Last Modified: 2013-11-20
I've used the resource editor to specify a toolbar-like bitmap (that is, it has about 30 images all concatenated together).

I then use the CImageList.Create() function to load that resource and turn it into an image list for use with tree and list controls, etc:

Create(UINT nBitmapID, int cx, int nGrow, COLORREF crMask);

Problem is, I can't see a way to get an individual CBitmap out of the image list for a specific image; that is,

CBitmap bmpToExtract;
RetrieveBitmap(CImageList *myList, UINT iImageNumber, &bmpToExtract);

The GetImageInfo() function apparently retrieves the entire bitmap, not just a bitmap for the image I want to extract.

I sure hope there's any easy answer I'm blindly missing....

Thanks,

--JWimbish
0
Comment
Question by:JSW
2 Comments
 
LVL 7

Accepted Solution

by:
galkin earned 100 total points
ID: 1300213
HBITMAP CImageListEx::GetImageBitmap(int i)
{
IMAGEINFO imInfo;

// get screen DC
CDC *pDC = CDC::FromHandle(::GetDC(NULL));

// use GetImageInfo to get image size, since all images have the // same size use 0 index
BOOL res  = GetImageInfo(0, &imInfo);

if( res == NULL )
      return NULL;
      
CSize imSize = CSize(imInfo.rcImage.right - imInfo.rcImage.left,
            imInfo.rcImage.bottom - imInfo.rcImage.top );

// create compatible DC, bitmap, selecting bitmap into memory DC
// and force image list to draw desired image onto memory DC
CDC memDC;
memDC.CreateCompatibleDC(pDC);
HBITMAP hBm = ::CreateCompatibleBitmap(pDC->GetSafeHdc(), imSize.cx, imSize.cy);
HBITMAP hOldBm = (HBITMAP)::SelectObject(memDC.GetSafeHdc(), hBm);
Draw(&memDC, i, CPoint(0, 0), ILD_NORMAL);
::SelectObject(memDC.GetSafeHdc(), hOldBm);

// return bitmap      
return hBm;

}
0
 

Author Comment

by:JSW
ID: 1300214
Many thanks for the timely answer! I've tried it and it does the trick.
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
Have you tried to learn about Unicode, UTF-8, and multibyte text encoding and all the articles are just too "academic" or too technical? This article aims to make the whole topic easy for just about anyone to understand.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question