Re: Bitblt Transparency question - C / C++ / MFC Discussion Boards

Re: Doxygen is melting my face, need pointers

Trevor Johansen6-Jun-10 8:46

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.

Re: Doxygen is melting my face, need pointers

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

Re: Doxygen is melting my face, need pointers

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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Re: Doxygen is melting my face, need pointers

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/[^]

Bitblt Transparency question

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

Niklas L

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.

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Re: Bitblt Transparency question

ForNow6-Jun-10 10:33

ForNow

6-Jun-10 10:33

unchaged still has white background

here is my code

CBitmap *bm = new CBitmap;           // Bitmap Object

	  bm->LoadBitmap((UINT) IDD_BITMAP);             // LOAD THE ARROW
     
      CDC *cdcwindow = this->GetDC();

      CDC cdcimage;

     cdcimage.CreateCompatibleDC(cdcwindow);

	CBitmap *oldbit = cdcimage.SelectObject(bm);

	 cdcimage.SetDCBrushColor(RGB(125,125,125));
     
	 COLORREF cr = cdcimage.GetPixel(0,0);

	 cdcimage.FloodFill(0,0,cr);

	 bm = cdcimage.SelectObject(oldbit);
		 


    later stgm.hBitmap = (HBITMAP)*bm;

Re: Bitblt Transparency question

Niklas L6-Jun-10 10:59

Niklas L

6-Jun-10 10:59

You are filling it with the color you had at (0, 0). That will change nothing.

The color (last arg in FloodFill) should be the new color value. As far as I see, you dont need the GetPixel() call at all.

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Re: Bitblt Transparency question

ForNow6-Jun-10 11:20

ForNow

6-Jun-10 11:20

Thought it filled it with the Brush okay thankx

Re: Bitblt Transparency question

ForNow6-Jun-10 11:30

ForNow

6-Jun-10 11:30

How does it know How much to fill I only want to fill the BackGround

Re: Bitblt Transparency question

Niklas L6-Jun-10 11:42

Niklas L

6-Jun-10 11:42

It will fill every pixel adjacent to the given pixel that has the same original color recursively. It will not touch pixels containing other colors, and not groups of pixels not 'connected' to the original 'pixel group'.

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Re: Bitblt Transparency question

ForNow6-Jun-10 11:48

ForNow

6-Jun-10 11:48

Thakx I appreciate your help

Re: Bitblt Transparency question

ForNow6-Jun-10 17:42

ForNow

6-Jun-10 17:42

Filled the entire bitmap all white

from the MSDN doc says that area will be filled with the current brush till the color boudry

I would think boudry is the RGB of the yellow arrow

Here is the code

CBitmap *bm = new CBitmap;           // Bitmap Object

 bm->LoadBitmap((UINT) IDD_BITMAP);             // LOAD THE ARROW

 CDC *cdcwindow = this->GetDC();

 CDC cdcimage;

  cdcimage.CreateCompatibleDC(cdcwindow);

   CBitmap *oldbit = cdcimage.SelectObject(bm);

  cdcimage.SetDCBrushColor(RGB(125,125,125));

    clr = RGB(125,125,125);

  cdcimage.FloodFill(0,0,clr);

  bm = cdcimage.SelectObject(oldbit);

MFC Library Reference
CDC::FloodFill

Fills an area of the display surface with the current brush.

Copy
BOOL FloodFill(
int x,
int y,
COLORREF crColor
);

Parameters
x
Specifies the logical x-coordinate of the point where filling begins.

y
Specifies the logical y-coordinate of the point where filling begins.

crColor
Specifies the color of the boundary.

reading the doc on MSDN for Flood fill says it will fill the Color with the Current

brush

Re: Bitblt Transparency question

Niklas L6-Jun-10 20:48

Niklas L

6-Jun-10 20:48

ForNow wrote:
reading the doc on MSDN for Flood fill says it will fill the Color with the Current brush

The brush they speak of is the pattern. In your case you want a solid brush (filling every pixel) which is the default brush of a DC. You don't need the SetDCBrushColor call for FloodFill to work.

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Re: Bitblt Transparency question

ForNow7-Jun-10 2:27

ForNow

7-Jun-10 2:27

commentend out the SetDCBrushColor still getting a all white picture I am going to

CBitMap::GetBitmapBits and look at memory to see whats the bitmap looks like GetPixel just got the first byte

there is something strange here

thankx again

Asynchronous sockets

onyxbird5-Jun-10 19:06

onyxbird

5-Jun-10 19:06

Hello,

I'm trying to write a asynchronous server that accepts (non-blocking) clients receives data from the client and reponds.

I have managed to write and get it to work a single threaded server blocking & a multithreaded server that blocks also. But now I have to make one that doesn't block and only a single thread.

I know that I setup the socket to async mode with ioctlsocket(). but after that how do I do a non-blocking
listen() & accept(). Also I have been reading that I need to use select() for when a client needs to read, write, etc...

I have been staring at the following example at CP (Code Project) at Programming Windows TCP Sockets in C++ for the Beginner[^]

which is a great example, but mine is console based. So I understand that code for the most part. But since I'm not use MFC with it just C or C++ it is a little a different and I could really use some help. any help will be greatly appreciate, and ty in advance.

Gemini S....

Re: Asynchronous sockets

Aescleal5-Jun-10 19:36

Aescleal

5-Jun-10 19:36

This[^] isn't a bad example of how to use select() in a traditional C application. There's only one non-portable thing in there as far as I can tell and that could be easily replaced.

Hope that helps,

Cheers,

Ash

Re: Asynchronous sockets

Moak6-Jun-10 8:06

Moak

6-Jun-10 8:06

Hi, can you tell if you have a specific question or rather want to be pointed to some examples?

/M

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Re: Asynchronous sockets

onyxbird6-Jun-10 8:21

onyxbird

6-Jun-10 8:21

If I could get a specific example of how to use an asynchronous socket ( I know how to create), but how do I use it to get/send information to the client and it has to be non-blocking. That would help greatly thank you.

Gemini S.

Re: Asynchronous sockets

Moak6-Jun-10 10:13

Moak

6-Jun-10 10:13

Here is the theory: An asynchronous server will notify you when something interesting happens, e.g. about a new incoming connection, when data could be sent, or data could be received on a socket. So you do not have to to start a new thread for every incoming client connection. Instead you can handle many sockets within a single thread context, on Windows for example WSAAsyncSelect[^] will notify you if any of your socket status changes (see FD_READ and FD_WRITE).

Here are two practical examples with source code:
- Programming Windows TCP Sockets in C++ for the Beginner[^]
- CAsyncSocketEx - Replacement for CAsyncSocket with proxy and SSL support[^]

Btw, there are also a couple of C++ network libraries with asynchronous sockets. You sounded like you wanted to implement it on you own, so just wanted to let you know that there are working solutions.

Happy coding Smile | :)

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Re: Asynchronous sockets

onyxbird7-Jun-10 12:02

onyxbird

7-Jun-10 12:02

nice kicka$$ that is what I thought needed to hear it to have it clear it up now I just need to get the syntax down and learn how to implement it and that will work. Thanks for the help /M

Gemini S...

Re: Asynchronous sockets

Mauro Leggieri6-Jun-10 9:11

Mauro Leggieri

6-Jun-10 9:11

Hi,

With select you check if you can write to a socket or read data from it. But there are some things about performance...

If you target Linux... it is best to use poll.

If you can, group many sockets in one select call (usually max is 64 sockets).

It you target Win2000 or later... try advanced io completion ports. The best thing.

Best regards,
Mauro H. Leggieri

P.D.: Check setsockopt to make a socket non-blocking.

Re: Asynchronous sockets

onyxbird7-Jun-10 12:03

onyxbird

7-Jun-10 12:03

thaanks alot this is helpful too... Mauro preciate the help.

Gemini S...

How to Save Picture(Image)

voo doo125-Jun-10 15:44

voo doo12

5-Jun-10 15:44

Hi everyone

I've a project where i have webBrowser control to display web page contents. When a user wants to save pictures(image(s)) to hard drive instead of he/she right clicking the picture(image) and clicking 'Save Picture As...', I have a button the user click that button and programatically saves the picture(image).

I googled, post my question at MSDN, here, for a year and half no luck. I found some codes but they only save the portion of picture (image) which is displayed by screen. When ever the picture(image) is larger than the computer's physical screen size, I endes up saving partial picture(image).

This forum seems more live than any other forum I know. Please help. Help.

Re: How to Save Picture(Image) [modified]

Niklas L6-Jun-10 9:51

Niklas L

6-Jun-10 9:51

By image, do you mean the rendered html page as an image, or individual images on the page (img tags)?

I assume the first since the latter is not very difficult.

Have you tried IHTMLElementRender.DrawToDC on the root element, and supplying your own DC with a selected bitmap?

Edit: maybe it was the latter case anyway. I looked to see if there was an easy way, but it seems you cannot easily get a handle to the actual bitmap of the image. But you could still use IHTMLElementRender.DrawToDC on the img element itself I suppose.

See also:
Capture an HTML document as an image[^]
http://www.nathanm.com/ihtmlelementrender-opacity/[^]

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modified on Sunday, June 6, 2010 4:21 PM

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