C / C++ / MFC

6-Jun-10 21:59

I need to render a image in progress bar control. Can anyone please help me how to do this.

Thanks in advance

Niklas L6-Jun-10 22:50

6-Jun-10 22:50

The steps are:
1. Subclass the control
2. Handle WM_PAINT
3. Draw the graphics as you like.

AbhiHcl6-Jun-10 23:07

6-Jun-10 23:07

Thanks for ur reply,

But my question is " How I can render a image in the progress bar, Suppose I hv a line image with green color and I want that line image should increase in progress bar ".

I hope u will help me. If possible plz send some code.

Thanks

Niklas L6-Jun-10 23:31

6-Jun-10 23:31

If the image can be stretched you can do the following. (Its MFC and without error checking)

void CMyProgressCtrl::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	
	CRect rc;
	GetClientRect(rc);

	int nLower, nUpper;
	GetRange(nLower, nUpper);

	int nPos = GetPos();

	int nWidth = (int) ((nPos / (float) (nUpper - nLower)) *rc.Width());

	BITMAP bm;
	m_bitmap.GetBitmap(&bm);

	CDC dc2;
	dc2.CreateCompatibleDC(&dc);
	CBitmap *pOldBitmap = dc2.SelectObject(&m_bitmap);

	dc.StretchBlt(rc.left, rc.top, nWidth, rc.Height(), &dc2, 0, 0, bm.bmWidth, bm.bmHeight, SRCCOPY);

	dc2.SelectObject(pOldBitmap);
}

AbhiHcl7-Jun-10 0:02

7-Jun-10 0:02

Thanks For ur response..
Could u plz tell me what is m_bitmap.GetBitmap(&bm) does. Becose I am getting assertion error at that line while running .

Niklas L7-Jun-10 1:14

7-Jun-10 1:14

It's getting some general properties for the bitmap. In this case we are interested in the size of the image bmWidth and bmHeight members of the BITMAP struct, to be able to know how much to stretch the image.

If you get an ASSERT it could be because you have not loaded any bitmap yet. I assume m_bitmap is of type CBitmap and that it is declared as a member of CMyProgrssCtrl.

In the constructor (or Create and PreSubclassWindow) do m_bitmap.LoadBitmap(IDB_BITAMP) where IDB_BITMAP is the bitmap you have in your resources.

AbhiHcl7-Jun-10 1:28

7-Jun-10 1:28

Thanks dear..
I have done it with Image class and its working fine, only I hv to do some modification..

Thanks a lot...

Niklas L7-Jun-10 1:44

7-Jun-10 1:44

no problem

David Crow7-Jun-10 4:12

David Crow

7-Jun-10 4:12

AbhiHcl wrote:
Becose I am getting assertion error at that line while running .

What line of what file is asserting?

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fatal error C1900

T.RATHA KRISHNAN6-Jun-10 18:07

T.RATHA KRISHNAN

6-Jun-10 18:07

When I compile my project, it shows the following linker error.

fatal error C1900: Il mismatch between 'P1' version '20080116' and 'P2' version '20070207'

How do I resolve this error?

Stephen Hewitt6-Jun-10 18:08

Stephen Hewitt

6-Jun-10 18:08

Reinstall your development environment. It look like it's using a mixture of two tool-set versions.

Steve

T.RATHA KRISHNAN7-Jun-10 0:21

T.RATHA KRISHNAN

7-Jun-10 0:21

Reinstalling VC++ didn't work. Cry | :((

Stephen Hewitt7-Jun-10 14:03

Stephen Hewitt

7-Jun-10 14:03

The error message is explained here[^]. Can you quote the exact message?

Steve

Doxygen is melting my face, need pointers

David Crow7-Jun-10 4:14

David Crow

7-Jun-10 4:14

C1900 is not a linker error, but a compiler error. Have you tried Googling for C1900?

Trevor Johansen6-Jun-10 8:24

Trevor Johansen

6-Jun-10 8:24

I am attempting to document my code and its turning into a huge mess. The syntax for doxygen is making my code look terrible as theirs so many commenting styles now and I have parts of the code that the user does not need to be aware of that doxygen automatically adds. For example I have a structure and even with no commenting it shows up on the modules page and variables.

I also dislike how the functions are in random order, their should be a way to define their order as having the init() 3rd from the bottom makes no since.

Can anyone recommend a site that shows an empty source file and section by section they add the commenting and go over how to include/exclude variables & functions and how to modify the generated HTML layout?

Documentation is a project onto itself isn't it...

Aescleal6-Jun-10 8:29

Aescleal

6-Jun-10 8:29

Just pass the headers to your interfaces through Doxygen - then only things that matter to the users of your code will be documented. Things like internal implementation details won't show up. Then you can concentrate on presenting your interfaces using Doxygen and you won't have to worry about any dirty implementation details.

Cheers,

Ash

Trevor Johansen6-Jun-10 8:46

Trevor Johansen

6-Jun-10 8:46

I like to have clean header files that just give the relevant data and functions to the user, I use to just block document the header but figured as things got more complex I should use doxygen as then I can give examples and everything is in a organized place. Do you guys usually keep a copy of the header with all the doxygen markups and then include a clean unmarked copy with the library or something as my header looks like confetti.

Aescleal6-Jun-10 11:01

Aescleal

6-Jun-10 11:01

To be honest I don't tend to use Doxygen anymore - I find a decent set of unit tests usually works better to describe how to use something. However when I did use it a couple of years ago everything got piled in a single copy of the interface files. I've never tried it but I can imagine things getting a bit hairy and hard to keep synched if you keep two versions of things.

Cheers,

Ash

Moak6-Jun-10 10:18

Moak

6-Jun-10 10:18

Just in case you looking for a less invasive alternative, see Wikipedia's comparison of documentation generators[^]

Hope this helps! Smile | :)

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Bitblt Transparency question

Trevor Johansen6-Jun-10 12:29

Trevor Johansen

6-Jun-10 12:29

Thanks for that link, I just discovered Natural Docs. It was created with exactly what I had in mind, generate help files from human readable in code comments!

Doxygen comments where cryptic to read in code with all its //! \bried /** */ stuff going on but Natural Docs has a very natural layout. I changed a few wordings in my existing comments and I got nice clean output. Also it has a proper walk through which is nice.

I recommend you guys check it out.

http://www.naturaldocs.org/[^]

ForNow5-Jun-10 23:31

ForNow

5-Jun-10 23:31

Hi,

I have bitmap with a white background and a yellow arrow I would like to convert the background to gray

So I have the following code

       CBitmap *bm = new CBitmap;           // Bitmap Object

bm->LoadBitmap((UINT) IDD_BITMAP);   // load the yellow arrow with white background

  CDC *cdcwindow = this->GetDC();        // get dc

  CDC cdcimage;

 cdcimage.CreateCompatibleDC(cdcwindow);     // create a memory bitmap

CBitmap *oldbit = cdcimage.SelectObject(bm);   // select the it in






   cdcimage1.CreateCompatibleDC(&cdcimage);      // create another memory bitmap
   cdcimage1.SelectObject(bm);                      // select the color bitmap

   cdctrans.CreateCompatible(&cdcimage);             //Create another memory DC

   CBitmap bmask;                                     //  Create mask

   bmask.CreateBitmap(bm_struct.bmWidth,bm_struct.bmHeight,1,1,NULL);   // create a mono bitmap
   cdctrans.SelectObject(&bmask);                                   // select it


    COLORREF clr = cdcimage1.GetPixel(0,0);                               // get the backgroundd color

     cdcimage1.SetBkColor(clr);                                           //    set it

      cdctrans.BitBlt(0,0,bm_struct.bmWidth,bm_struct.bmHeight,&cdcimage1,0,0,SRCCOPY);  // copy color to mono settting backgound bits to to the background
                                                                                             // which is white and the arrow to black

       cdcimage.SetBkColor(RGB(125,125,125));                                                // set gray background
   cdcimage.SetTextColor(RGB(255,255,0));                                                // set yellow foreground


       cdcimage.BitBlt(0,0,bm_struct.bmWidth,bm_struct.bmHeight,&cdctrans,0,0,SRCCOPY);     // this should change white background to gray
                                                                                                // and black arrow to yellow

       stgm.hBitmap = (HBITMAP)*bm;                                                             get bit map handle

later on when I use the bit map handle in "OLE" it sets the bitmap as all yellow

Re: Bitblt Transparency question

Niklas L6-Jun-10 9:07

6-Jun-10 9:07

Would not CDC::FloodFill() be easier to use?

Select your image into a device context, FloodFill it, unselect it from DC.