C / C++ / MFC

4-Jan-07 8:31

can someone explain what im doiing wrong here:

<br />
HBRUSH backBrush = ::CreateSolidBrush(RGB(pLevels->frequency[0][0],0,0));<br />
<br />
HDC memDC = CreateCompatibleDC ( hdc );<br />
HBITMAP bitmap1 = CreateCompatibleBitmap(memDC,prc->left,prc->bottom);<br />
HBITMAP oldBitmap = SelectObject(memDC,bitmap1);<br />
<br />
::FillRect(memDC,prc,backBrush);<br />
::Ellipse(memDC,20,20,120,120);<br />
::BitBlt(hdc,0,0,prc->left,prc->bottom,memDC,0,0,SRCCOPY);<br />
<br />
::DeleteObject( backBrush );<br />
::SelectObject(memDC, oldBitmap);<br />
::DeleteObject(bitmap1);<br />
::DeleteDC(memDC);<br />

It just doesnt display anything.

Mark Salsbery4-Jan-07 8:36

4-Jan-07 8:36

Is prc->left what you intended as the bitmap width in the call to
CreateCompatibleBitmap(memDC,prc->left... ??

It's used in BitBlt too...

Mark

ceejeeb4-Jan-07 8:38

4-Jan-07 8:38

yes it is the width

Mark Salsbery4-Jan-07 8:42

4-Jan-07 8:42

ceejeeb wrote:
yes it is the width

If that's the case then how will this work...

::FillRect(memDC,prc,backBrush);

Are you sure you don't mean to use prc->right?

Mark

ceejeeb4-Jan-07 8:45

4-Jan-07 8:45

ahh yes my mistake it was menat to be right.
Now its draws to the screen but not as intended the back background is dotted black and white.

Mark Salsbery4-Jan-07 8:47

4-Jan-07 8:47

try changing
HBITMAP bitmap1 = CreateCompatibleBitmap(memDC,prc->left,prc->bottom);
to
HBITMAP bitmap1 = CreateCompatibleBitmap(hdc,prc->right,prc->bottom);

The default bitmap for a dc is monochrome - you want a bitmap compatible with the original dc.

Smile | :)

ceejeeb4-Jan-07 8:56

dynamic CImageList icons - possible? [modified]

4-Jan-07 8:56

Thanks alot mark all is working fine now. Big Help.

neilsolent4-Jan-07 8:13

neilsolent

4-Jan-07 8:13

I have a CTreeCtrl and an associated CImageList. Is there any way I can load images into the CImageList at runtime (e.g. from an .ico file supplied by the user) without them being hardcoded into the executable files ?

-- modified at 14:21 Thursday 4th January, 2007

cheers,
Neil

Mark Salsbery4-Jan-07 8:26

4-Jan-07 8:26

You can add/remove images from image lists dynamically.

Check out CImageList::Add() (::ImageList_AddIcon()), ::LoadImage(), etc.

Mark

James R. Twine4-Jan-07 8:29

James R. Twine

4-Jan-07 8:29

   Yes - although if dealing with a lot of images it is better to initially size the ImageList control to hold a bunch of images.

   The CImageList::GetImageInfo(...) function or the ImageList_GetImageInfo(...) macro can be used to write data into the images maintained by the ImageList control.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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CPallini4-Jan-07 8:38

CPallini

4-Jan-07 8:38

see
here

Note: you can dynamically load an image using the LoadImage API.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Hamid_RT4-Jan-07 18:11

Hamid_RT

4-Jan-07 18:11

Yes you have many good function in CImageList Add,Remove,Replace

WhiteSky

neilsolent6-Jan-07 0:09

neilsolent

6-Jan-07 0:09

Thanks to everyone for the posts.

I know these functions, but they don't realy explain how to load icons from files or "external" data sources - this is what I meant by dynamic (the icons aren't already hardcoded as resources in the executables). I found the functions I was looking for, which are:

ExtractIcon() - load icon from disk
CreateIconFromResourceEx() - load icon from memory

Sorry, I think I should have explained what I was after a bit better..

cheers,
Neil

Restricting access to Windows

Hamid_RT6-Jan-07 19:13

Hamid_RT

6-Jan-07 19:13

I think you need to SHGetFileInfo to get information about file and... and also if you dont know about CImageList and its functions search on the codeproject it has a lot of good articles Smile | :)

WhiteSky

pcfilho4-Jan-07 7:26

pcfilho

4-Jan-07 7:26

Good afternoon,

I would like to restrict access to Windows in my program. More especifically, I want to block some "key combinations" (Ctrl-Alt-Del, Alt-Tab, Windows key). Until now, I did not find anything to help me.

Can someone help me?

Thanks for the attention,
Paulo Cezar

PCFilho
Rio de Janeiro, Brazil

Mark Salsbery4-Jan-07 7:57

4-Jan-07 7:57

Maybe you can use SetWindowsHookEx(WH_KEYBOARD,...) and eat the keyboard messages.

David Crow4-Jan-07 8:03

David Crow

4-Jan-07 8:03

But not all keyboard combinations are passed on by Windows.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Mark Salsbery4-Jan-07 8:08

4-Jan-07 8:08

Thanks.

James R. Twine4-Jan-07 8:16

James R. Twine

4-Jan-07 8:16

I think a global keyboard hook can catch everything except the SAS. If not a keyboard hook, then a CBT hook can... I am pretty sure one of them can catch everything except the SAS...

Peace!

Mark Salsbery4-Jan-07 8:18

4-Jan-07 8:18

I'm drawing a blank....what is "the SAS"?

Thanks,
Mark

David Crow4-Jan-07 8:23

David Crow

4-Jan-07 8:23

Secure Attention Sequence, which is what's required for access to Ctrl-Alt-Del.

More

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Mark Salsbery4-Jan-07 8:28