CImageList Class

CImageList Class

An "image list" is a collection of same-sized images, each of which can be referred to by its zero-based index. Image lists are used to efficiently manage large sets of icons or bitmaps. All images in an image list are contained in a single, wide bitmap in screen device format. An image list may also include a monochrome bitmap that contains masks used to draw images transparently (icon style). The Microsoft Win32 application programming interface (API) provides image list functions that enable you to draw images, create and destroy image lists, add and remove images, replace images, merge images, and drag images.

 

CImageList::Create

Initializes an image list and attaches it to a CImageList Class object.

BOOL Create(

   int cx,

   int cy,

   UINT nFlags,

   int nInitial,

   int nGrow 

);

BOOL Create(

   UINT nBitmapID,

   int cx,

   int nGrow,

   COLORREF crMask 

);

BOOL Create(

   LPCTSTR lpszBitmapID,

   int cx,

   int nGrow,

   COLORREF crMask 

);

BOOL Create(

   CImageList& imagelist1,

   int nImage1,

   CImageList& imagelist2,

   int nImage2,

   int dx,

   int dy 

);

BOOL Create(

   CImageList* pImageList 

);

Parameters

cx

Dimensions of each image, in pixels.

cy

Dimensions of each image, in pixels.

nFlags

Specifies the type of image list to create. This parameter can be a combination of the following values, but it can include only one of the ILC_COLOR values.

Value	Meaning
ILC_COLOR	Use the default behavior if none of the other ILC_COLOR* flags is specified. Typically, the default is ILC_COLOR4; but for older display drivers, the default is ILC_COLORDDB.
ILC_COLOR4	Use a 4-bit (16 color) device-independent bitmap (DIB) section as the bitmap for the image list.
ILC_COLOR8	Use an 8-bit DIB section. The colors used for the color table are the same colors as the halftone palette.
ILC_COLOR16	Use a 16-bit (32/64k color) DIB section.
ILC_COLOR24	Use a 24-bit DIB section.
ILC_COLOR32	Use a 32-bit DIB section.
ILC_COLORDDB	Use a device-dependent bitmap.
ILC_MASK	Uses a mask. The image list contains two bitmaps, one of which is a monochrome bitmap used as a mask. If this value is not included, the image list contains only one bitmap. See Drawing Images from an Image List for additional information on masked images.

nInitial

Number of images that the image list initially contains.

nGrow

Number of images by which the image list can grow when the system needs to resize the list to make room for new images. This parameter represents the number of new images the resized image list can contain.

nBitmapID

Resource IDs of the bitmap to be associated with the image list.

crMask

Color used to generate a mask. Each pixel of this color in the specified bitmap is changed to black, and the corresponding bit in the mask is set to one.

lpszBitmapID

A string containing the resource IDs of the images.

imagelist1

A reference to a CImageList object.

nImage1

Index of the first existing image.

imagelist2

A reference to a CImageList object.

nImage2

Index of the second existing image.

dx

Offset of the x-axis of the second image in relationship to the first image, in pixels.

dy

Offset of the y-axis of the second image in relationship to the first image, in pixels.

pImageList

A pointer to a CImageList object.

  

Return Value

 

Nonzero if successful; otherwise 0.

 Example

m_myImageList.Create(32, 32, ILC_COLOR8, 0, 4);

CImageList::Add

Call this function to add one or more images or an icon to an image list.

int Add(

   CBitmap* pbmImage,

   CBitmap* pbmMask 

);

int Add(

   CBitmap* pbmImage,

   COLORREF crMask 

);

int Add(

   HICON hIcon 

);

Parameters

pbmImage

Pointer to the bitmap containing the image or images. The number of images is inferred from the width of the bitmap.

pbmMask

Pointer to the bitmap containing the mask. If no mask is used with the image list, this parameter is ignored.

crMask

Color used to generate the mask. Each pixel of this color in the given bitmap is changed to black and the corresponding bit in the mask is set to one.

hIcon

Handle of the icon that contains the bitmap and mask for the new image.

Return Value

 

Zero-based index of the first new image if successful; otherwise – 1.

Example

// Add my icons.

m_myImageList.Add(AfxGetApp()->LoadIcon(IDI_ICON1));

m_myImageList.Add(AfxGetApp()->LoadIcon(IDI_ICON2));

// Add my bitmap, make all black pixels transparent.

CBitmap bm;

bm.LoadBitmap(IDB_BITMAP1);

m_myImageList.Add(&bm, RGB(0, 0, 0));

CImageList::Attach

Call this function to attach an image list to a CImageList object.

BOOL Attach(

   HIMAGELIST hImageList 

);

Parameters

hImageList

A handle to an image list object.

Return Value

 

Nonzero if the attachment was successful; otherwise 0.

 Example

void AddQuestion(HIMAGELIST hmyImageList)

{

   CImageList imgList;

   // Attach the image list handle to the CImageList object.

   imgList.Attach(hmyImageList);

   // Add a new icon to the image list.

   imgList.Add(AfxGetApp()->LoadStandardIcon(IDI_QUESTION));

   // Detach the handle from the CImageList object.

   imgList.Detach();

}

CImageList::Write

Call this function to write an image list object to an archive.

BOOL Write(

   CArchive* pArchive 

);

Parameters

pArchive

A pointer to a CArchive object in which the image list is to be stored.

Return Value

Nonzero if successful; otherwise 0.

Example

// Open the archive to store the image list in.

CFile   myFile(_T("myfile.data"), CFile::modeCreate | CFile::modeWrite);

CArchive ar(&myFile, CArchive::store);

// Store the image list in the archive.

m_myImageList.Write(&ar);

How to Draw Triangle in VC++

FileName : TriangleView.h

class CTriangleView : public CView
{
 ...
 CPoint tr[3],ct;
 int rad;
 double rd;
 CRect rc;
...
};


FileName : TriangleView.cpp


 #include "math.h"
...

CTriangleView::CTriangleView()
{
    // TODO: add construction code here
    rd=0.0174532935;
}

void CTriangleView::OnDraw(CDC* pDC)
{
    CTriangleDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // TODO: add draw code for native data here
    int i=0;
    GetClientRect (rc);
    ct.x = (rc.left + rc.right )/2;
    ct.y = (rc.top + rc.bottom )/2;
    rad=ct.x/2;
    while(i<3)
    {
    tr[i].x = ct.x + rad * sin(i*120*rd);
    tr[i].y = ct.y - rad * cos(i*120*rd);
    i++;
    }
    pDC->Polygon (tr,3);
}

CDC Text Functions

CDC::DrawText	Draws formatted text in the specified rectangle.
CDC::DrawTextEx	Draws formatted text in the specified rectangle using additional formats.
CDC::ExtTextOut	Writes a character string within a rectangular region using the currently selected font.
CDC::GetCharABCWidthsI	Retrieves the widths, in logical units, of consecutive glyph indices in a specified range from the current TrueType font.
CDC::GetCharacterPlacement	Retrieves various types of information on a character string.
CDC::GetCharWidthI	Retrieves the widths, in logical coordinates, of consecutive glyph indices in a specified range from the current font.
CDC::GetOutputTabbedTextExtent	Computes the width and height of a character string on the output device context.
CDC::GetOutputTextExtent	Computes the width and height of a line of text on the output device context using the current font to determine the dimensions.
CDC::GetOutputTextMetrics	Retrieves the metrics for the current font from the output device context.
CDC::GetTabbedTextExtent	Computes the width and height of a character string on the attribute device context.
CDC::GetTextAlign	Retrieves the text-alignment flags.
CDC::GetTextCharacterExtra	Retrieves the current setting for the amount of intercharacter spacing.
CDC::GetTextExtent	Computes the width and height of a line of text on the attribute device context using the current font to determine the dimensions.
CDC::GetTextExtentExPointI	Retrieves the number of characters in a specified string that will fit within a specified space and fills an array with the text extent for each of those characters.
CDC::GetTextExtentPointI	Retrieves the width and height of the specified array of glyph indices.
CDC::GetTextFace	Copies the typeface name of the current font into a buffer as a null-terminated string.
CDC::GetTextMetrics	Retrieves the metrics for the current font from the attribute device context.
CDC::GrayString	Draws dimmed (grayed) text at the given location.
CDC::SetTextAlign	Sets the text-alignment flags.
CDC::SetTextCharacterExtra	Sets the amount of intercharacter spacing.
CDC::SetTextJustification	Adds space to the break characters in a string.
CDC::TabbedTextOut	Writes a character string at a specified location, expanding tabs to the values specified in an array of tab-stop positions.
CDC::TextOut	Writes a character string at a specified location using the currently selected font.

Question List

Practical Question

Dialog Based Program

1. Write an Application to show the current ProgressBar value in EditBox as it incremented 1 to 100.
2. Create Dialog based Application with command button and MessageBox () (Use all Parameters) to print the message with no of clicks whenever user clicks on command button.
3.Write an Application to Split the Entered Text in EditBox and then enter them in ListBox with Uppercase.
(Hint : EditBox :"this is my book"
List Box: THIS
IS
MY
BOOK
4. Write a program to move values from one ListBox to another (1. One by One as User Select, All at Once).
5.Create a Dialog based Application with Static Texts to get the information like Computer Name, Total Memory, Free Memory and Total Load on processor.
6.Create Dialog Based Application to Read and Write a Data from Text file. Use EditBox to Show data.
7.Craete Dialog based Application Which read data from Text file in Reverse order. Show data in EditBox.


SDI/MDI Program

1. Write a program to Animate Circle.
2. Write a program to draw a line using three different mouse events.
3.Write an Apllication to Change Font in SDI.
(Hint : Use Menu for Opening CFontDialog)
4.Write a VC++ project that Draws a Polygon. And Clicking within it Changes its Border Color.
5.Write an Application to Show Current Cursor Position of Mouse in StatusBar.
6.Write an Application to Show Current Date(DD-MM-YYYY) format in StatusBar.
7. Write an Application to Make Simple Web Browser using HtmlView and ReBar.
8. Write an Application to Manipulate Database using (ODBC/ADO/DAO) Connectivity. User can perform Add, Update, Delete, MoveNext, MovePrevious, MoveLast and MoveFirst.

Important Questions

Visual C++ Question List

Theory Question

1. What is OOP ? Explain Inheritance and Polymorphism.
2. Explain Visual C++ Development Environment.
3. Explain CFile and CArchive with suitable example.
4. Explain Microsoft Foundation Class in VC++.
5. What is Serialization? Explain with Example.
6. Explain VC++ Development Environment.
7. List and Explain Different Extension used in VC++ project file.
8. List out different category of Messages. Explain Message Mapping with Example.
9. What is Document/View Architecture? Explain in Brief.

10. What is Device Context? Explain in Brief.

11. Explain Exception Handling in VC++.

12. List out Classes for GDI objects. Explain any two.

13. What is Active-X? Explain in Brief.

VC++ Question Paper

M.Sc Sem - I (IT) Examination

December - 2004

103 : Building Application Using VC++

(NEW)

1. Attemp any FOUR of the following.

(1) What is OOP?Explain Inheritance in brief.

(2) Diffrentiate : SDI v/s MDI

(3) What is Resource View? Explain its utility in VC++ Project.

(4) List the Tools of Dialog Toolbar. Explain any Four of them.

(5) Explain the process of setting Tab Order.

VC++ Code For Drawing Analog and Digital Clock

//CGDIClockView.h
class CGDIClockView : public CView
{
...
// Attributes
public:
      CString str;
      bool start;
 ...
};

// CGDIClockView.cpp
 CGDIClockView::CGDIClockView()
{
    // TODO: add construction code here
    start=false;
}

void CGDIClockView::OnStart()
{
    // TODO: Add your command handler code here
    start = true;

    int x=125,y=125;
    int a=125,b=50;
    int r=75;
    long int i=0,m=0,s=0,h=0;
    int j=12;
    double dtor=0.0174532935;

    CClientDC *pDC = new CClientDC (this);
   
    CPen cp;
    cp.CreatePen(2,1,RGB(255,0,255));
    pDC->SelectObject(&cp);
//Draw Clock

   

while(start)
  {
 

    cp.DeleteObject();
    cp.CreatePen(PS_SOLID,1,RGB(0,0,0));
    pDC->SelectObject(&cp);
   
    //Code for Drawing Circle with Number 1 to 12
    pDC->Ellipse (10,10,240,240);
    while(i<360)
    {
    a = x - x * sin(i*dtor);
    b = y - y * cos(i*dtor);
    str.Format("%d",j);
    pDC->TextOut(a-3,b-3,str);
    j--;
    i=i+30;
    }

    //Code for Drawing Second Hand
    cp.DeleteObject();
    cp.CreatePen(1,2,RGB(255,0,0));
    pDC->SelectObject(&cp);
   
    a = 125 + 110 * sin(s*dtor);
    b = 125 - 110 * cos(s*dtor);
   
    pDC->MoveTo(a,b);
    pDC->LineTo(x,y);
   
   
   //Code for Drawing Minute Hand
    cp.DeleteObject();
    cp.CreatePen(1,2,RGB(0,255,255));
    pDC->SelectObject(&cp);

       a = 125 + 90 * sin(m*dtor);
       b = 125 - 90 * cos(m*dtor);
   
    pDC->MoveTo(a,b);
    pDC->LineTo(x,y);

    //Code for Drawing Hour Hand
    cp.DeleteObject();
    cp.CreatePen(1,3,RGB(255,255,0));
    pDC->SelectObject(&cp);
   
    a = 125 + 70 * sin(h*dtor);
        b = 125 - 70 * cos(h*dtor);
   
    pDC->MoveTo(a,b);
    pDC->LineTo(x,y);
   
    s=s+6;
   
    str.Format("Hour : %ld Min : %ld Second : %ld",((s/6)/3600)%24,((s/6)/60)%60,(s/6)%60);
    pDC->TextOut (20,300,"                                                   ",50);
    pDC->TextOut (20,300,str);
    Sleep(500);
   
    //Code for Incrementing Value of Minute and Hour as per value of Seconds
    if(s%360==0 && s>0)
    {
       m=m+6;

       if(m%72==0 && m>0)
       {
          h=h+6;
       }

    }

    //Code for Reseting All Values after 24 Hours
    if(s==86400)
    {
       s=0;
    }

    Sleep(500);
    UpdateWindow();
   
  }
}

void CGDIClockView::OnStop()
{
    // TODO: Add your command handler code here
    start=false;
}