Imagelist, Visual Basic Programming

IMAGELIST

The CImageList object is a collection of the same sized images, all of which can be referred to by its index. The ImageList are used to proficiently manage the large sets of icon or bitmaps. The ImageList is not a control as it is not a window. They are used with some various types of controls like list control, tree control & tab control.

Steps to form an image list:

1. Make an SDI application

2. Generate a CImageList object as m_ImageList by choosing the class tabpage and right clicking on the CimagelistView object. Now Choose the add member variable.

3. Type the coding as shown below in the constructor.

CImagelistView::CImagelistView()

{

m_ImageList.Create(32,32,TRUE,4,1);

}

The first 2 parameters for Create are the dimensions of each image in the pixels and it is represented as cx of type int and cy of the type int. Both the cx and cy are 32 in this illustration. The fourth parameter is the initial number of images and it is four in this situation. The last parameter is by how much it can grow and it is 1 in this situation.

4. Override the user defined function Addbitmaptoimagelist.

5. To override the user defined function Right Clicking on the CImagelistView . The menu will pop up.

6. Then Add member function is choosen.

7. Specify the return type in the Function type text box. Now type BOOL for this illustration.

8. In the Function Declaration type the signature of the function, that is the function name followed by the parameter list.

9. For this illustration type Addbitmaptoimagelist(UINT resid) in the function declaration.

10. Generate 4 bitmaps namely the IDB_BITMAP2, IDB_BITMAP3, IDB_BITMAP4,

IDB_BITMAP5 and pass it to the Addbitmapimagelist function as the parameter.

11. To create a bitmap follow the steps as shown below.

Click the resource tabpage.

Expand the resources tree control

Right click on the bitmap resource.

Choose insert bitmap.

The editor will be exhibited.

Generate a bitmap with the drawing tools available and save.

The name of the bitmap will be automatically formed.

Addbitmaptoimagelist(IDB_BITMAP2);

Addbitmaptoimagelist(IDB_BITMAP3);

Addbitmaptoimagelist(IDB_BITMAP4);

Addbitmaptoimagelist(IDB_BITMAP5);

}

12 Type the coding as shown below in the Addbitmaptoimagelist function.

BOOL CImagelistView::Addbitmaptoimagelist(UINT resid)

{

BOOL b;

CBitmap bmp;

b=bmp.LoadBitmap(resid);

if(b != FALSE)

{

b=m_ImageList.Add(&bmp,RGB(255,255,255));

bmp.DeleteObject();

}

return b; }

The LoadBitmap member function of the CBitmap is used to initialize the bitmap object bmp. The Add member function of the CImagelist relates the bitmap with the image list. The DeleteObject recover the memory engaged by the gdi object, namely the bitmap in this situation.

13. Type the coding as shown below in OnDraw.

void CImagelistView::OnDraw(CDC* pDC)

{ The parameter pDC is a pointer to a device context. If it is null then the function

generates a memory device context that is compatible with the system display.

CPoint pt(0,0);

for(int i=0; i<4; i++)

{

m_ImageList.SetBkColor(RGB(123,111,222));

m_ImageList.Draw(pDC,i,pt,ILD_NORMAL);

ILD_NORMAL is the style & the images are drawn using the background color.

pt.x += 50;

}

}

14. Construct & then execute the project.

15. Four-bitmaps will be displayed side by side.

Posted Date: 10/10/2012 2:29:41 AM | Location : United States







Related Discussions:- Imagelist, Assignment Help, Ask Question on Imagelist, Get Answer, Expert's Help, Imagelist Discussions

Write discussion on Imagelist
Your posts are moderated
Related Questions
outline and explain in detail any 10 applications of vb.net

A For Each...Next loop is similar to a For...Next loop. Rather than repeating the statements a particular number of times, For Each...Next loop repeats group of statements for each

In this unit you have learned how to develop Web pages which use VBScript. You have learned to insert logic to your Web pages as along with any other programming application. You h

I have a problem with Visual Basic: exchangeable 2 images of place I have 2 picturebox''s placed a button when I click on the button, the 2 pictures of this place change with e

Software With Inappropriate Behavior: You would save a document; print it, and then you'll try to close it. The program will ask you if you want to save. This is because; the

Adding Records: 1. As in the earlier case Set the DatabaseName property as "C:\ex.mdb", now Set the Record Source for the data control as Customer and Set the Record Type to 0

Visual Interface  Based On Visual Patterns: The visual user interface should create recognizable patterns and text will be used for differentiating the objects with similar pa

Just like normal objects Dictionary object also has definite properties. These properties can be set to any valid value & can be retrieved as and while required. Pr


Executesql: The ExecuteSQL is used for executing the query on the database. The CRecordset uses the RFX mechanism to replace data between field data members of the record set