C / C++ / MFC Discussion Boards

Ivo Beltchev16-Dec-09 13:39

16-Dec-09 13:39

Hi
I am trying to use the theme images for the start menu in Vista. It has areas that are fully transparent (around the corners), areas that are fully opaque (for the menu items) and translucent areas for the black frame.

I tried DrawThemeBackground but the translucent areas show opaque. So basically I get either alpha 0 or alpha 255. Nothing inbetween. I looked up the image in the msstyles file (it is image #717) and it has the correct opacity values. Here's my code:

BITMAPINFO dib = {sizeof(dib)};
dib.bmiHeader.biWidth = rc.right;
dib.bmiHeader.biHeight = rc.bottom;
dib.bmiHeader.biPlanes = 1;
dib.bmiHeader.biBitCount = 32;
dib.bmiHeader.biCompression = BI_RGB;
unsigned int *bits;
HBITMAP bmp=CreateDIBSection(hdc,&dib,DIB_RGB_COLORS,(void**)&bits,NULL,0);
SelectObject(hdc,bmp);
SetDCBrushColor(hdc,0x0);
FillRect(hdc2,&rc,(HBRUSH)GetStockObject(DC_BRUSH));
DrawThemeBackground(theme,hdc,SPP_PLACESLIST,0,&rc,&rc);

I then check the alpha values in the bits array and besides couple of pixels with alpha=0 all the rest are 255.

Any ideas how to get the true opacity?

Re: Use theme elements with alpha

Adam Roderick J16-Dec-09 17:05

Adam Roderick J

16-Dec-09 17:05

Did you tried AlphaBlend [^]

Величие не Бога может быть недооценена.

Re: Use theme elements with alpha

Ivo Beltchev16-Dec-09 17:31

Ivo Beltchev

16-Dec-09 17:31

AlphaBlend will not help me. It is used for copying an image from one DC to another. I still need to get the correct alpha in the source DC somehow. And that's where the problem lies.

Re: Use theme elements with alpha

Rozis17-Dec-09 9:56

Rozis

17-Dec-09 9:56

Ivo Beltchev wrote:
AlphaBlend will not help me. It is used for copying an image from one DC to another. I still need to get the correct alpha in the source DC somehow. And that's where the problem lies.

If you need a code snippet to merge an alpha channel in from another bitmap, feel free to mail me.

Rozis

Re: Use theme elements with alpha

Code-o-mat16-Dec-09 20:25

Code-o-mat

16-Dec-09 20:25

Does DrawThemeBackground touch the alpha channel of the bitmap at all? I mean, are the alpha channel values different before and after using DrawThemeBackground?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: Use theme elements with alpha

Ivo Beltchev16-Dec-09 20:42

Ivo Beltchev

16-Dec-09 20:42

Kind of. First I fill the whole DC with 0, which is transparent black. After the call to DrawThemeBackground almost all pixels are opaque (255), except a few pixels in the corner (that make up the rounded corner). So those few pixels in the corner are not touched.

BTW, if instead of SPP_PLACESLIST I use LVP_LISTITEM+LISS_SELECTED and set the theme to "explorer", I get a translucent blue rectangle. Most pixels have alpha 179. That's the blue highlight of the listview items in Explorer. So it IS possible to get some alpha out of DrawThemeBackground. It just doesn't work with the start menu elements...

Re: Use theme elements with alpha

Code-o-mat16-Dec-09 20:59

Code-o-mat

16-Dec-09 20:59

Odd, i would have expected it to not touch the target's alpha channel...anyways, try maybe filling the bitmap with 255s for alpha rather than zeroes (you might need to do this manually or using GDI+ for example because as far as i can remember normal GDI calls will either ignore the alpha or set it to zero) and see if anything changes. It could also be possible -althorough it would be kinda stupid- that DrawThemeBackground expects the background onto which it draws to be filled with some system-set start-menu background color...

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

can I run notepad.exe inside View window?

rambojanggoon16-Dec-09 9:20

rambojanggoon

16-Dec-09 9:20

hi,

I'd like to know..
is it possible to run notepad.exe in my CView window?

my Cview window coule be parent window of notepad.exe?
so notepad.exe can move only inside my view window?
thanks.

Re: can I run notepad.exe inside View window?

Nemanja Trifunovic16-Dec-09 9:40

Nemanja Trifunovic

16-Dec-09 9:40

Notepad is pretty much a wrapper on top of the edit control. Just use CEditView[^] and you have your Notepad.

utf8-cpp

minimize notification of MFC application

kasi1416-Dec-09 7:45

kasi14

16-Dec-09 7:45

Hi All,

I am working on a tabbed application for my current project.

In the process of development i have see that my application behaves differently if i minimize and maximize the application using the minimize/maximize application button of the window and if i minimize/maximize it by clicking the application icon on the task bar.

what happens:

In the tabbed dialog d1 for a special case i am overlaying another dialog d2 so that i can see d2 only.
if i minimize the application using the minimize button and again maximize using the button, i can see the d2 dialog.

if i click on the application icon on taskbar to minimize and again maximize, d2 dissapers and d1 shows up.

I will appreciate if any one have inputs on this issue.

Kasi

Re: minimize notification of MFC application

Abhi Lahare16-Dec-09 9:52

Abhi Lahare

16-Dec-09 9:52

I hope you are calling SetActivePage( page index) and your code may need to remember which is current active page

HTH
abhi

How to get a thread's exit code

masnu16-Dec-09 5:24

masnu

16-Dec-09 5:24

Hi guys,

I'm creating a multi-threaded application using _beginthreadex() and _endthreadex(). If my thread executes correctly I call _endthreadex( 0 ) but if it doesn't I call _endthreadex( <some error code> ). How can I capture the thread's exit code in the main thread?

Thanks.

Re: How to get a thread's exit code

«_Superman_»16-Dec-09 5:38

«_Superman_»

16-Dec-09 5:38

GetExitCodeThread[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Re: How to get a thread's exit code

Rajesh R Subramanian16-Dec-09 7:56

Rajesh R Subramanian

16-Dec-09 7:56

masnu wrote:
If my thread executes correctly I call _endthreadex( 0 )

Just returning would be the best way to exit a thread.

“Follow your bliss.” – Joseph Campbell

Re: How to get a thread's exit code

masnu16-Dec-09 8:07

masnu

16-Dec-09 8:07

Hi Rajesh,

I know that returning from a thread will call _endthreadex() but everything I have read says that "terminating a thread with a call to endthread or _endthreadex helps to ensure proper recovery of resources allocated for the thread". Is it safe to assume that returning will accomplish this?

Thanks,
Paul

Re: How to get a thread's exit code

Rajesh R Subramanian16-Dec-09 8:25

Rajesh R Subramanian

16-Dec-09 8:25

Hi Paul,

masnu wrote:
but everything I have read says that

The documentation is confusing (I presume you read the documentation? If there's some other source which recommends _endthreadex instead of just returning the control, please ignore it. It's wrong). The documentation could have better been:

"Do not call _endthread() or ExitThread() or TerminateThread(), etc., on a thread that was created by a call to _beginthreadex(). That will lead to resource leak. If you have to explicitly "end" a thread that was created by _beginthreadex(), then you should only call _endthreadex(). But just returning from the function is a better alternative." (similarly, _endthread and _beginthread is a pair)

It's been explained very elaborately on the book Windows via C/C++ (and probably in a couple of other books too). I remember Dr. Joseph Newcomer had written on this too, which I'm lazy to search for now.

masnu wrote:
Is it safe to assume that returning will accomplish this?

Yes! The resource cleanup will happen perfectly if you simply return the control. To conclude, there's simply no reason to call _endthreadex (or any of their akin functions that explicitly "ends" a thread) from your code. Returning the control is the best thing to do! Let me know if you need more information.

“Follow your bliss.” – Joseph Campbell

Re: How to get a thread's exit code

Rajesh R Subramanian16-Dec-09 8:30

Rajesh R Subramanian

16-Dec-09 8:30

OK, I just searched Dr. Joseph's article and it's here: http://www.flounder.com/badprogram.htm#AfxExitThread[^] (He's a man that has earned a lot of respect in the community, and he says "Doing this will result in erroneous programs").

Now it's 12.59 AM here and I better hit the bed or I'll wake up late. Good night (probably good day) to you! Smile | :)

“Follow your bliss.” – Joseph Campbell

Re: How to get a thread's exit code

masnu16-Dec-09 8:33

masnu

16-Dec-09 8:33

Thanks Rajesh. I appreciate the help.

Paul

re: Building a static linked VS C++ executable

Alan Kurlansky16-Dec-09 2:44

Alan Kurlansky

16-Dec-09 2:44

I want to create a custom build configuration that creates an executable that is statically linked to all the run-time libraries. That way I do not need to worry about making sure all the necessary dll's are on the target machine. How do I do that in VS?
Thanks

Re: re: Building a static linked VS C++ executable

Rajesh R Subramanian16-Dec-09 3:38

Rajesh R Subramanian

16-Dec-09 3:38

Have you looked into project settings? In VS 2008, its' under Configuration properties -> General.

“Follow your bliss.” – Joseph Campbell

fatal error C1001: INTERNAL COMPILER ERROR

wangningyu16-Dec-09 1:52

wangningyu

16-Dec-09 1:52

Hello everybody !

I don't have this folder("E:\8186") on my computer , How can I solve this error ?

Deleting intermediate files and output files for project 'Test - Win32 Release'.
--------------------Configuration: Test - Win32 Release--------------------
Compiling resources...
Compiling...
StdAfx.cpp
Compiling...
Test.cpp
TestDlg.cpp
Generating Code...
D:\Project\Test\TestDlg.cpp(349) : fatal error C1001: INTERNAL COMPILER ERROR
  (compiler file 'E:\8168\vc98\p2\src\P2\main.c', line 494)
    Please choose the Technical Support command on the Visual C++
    Help menu, or open the Technical Support help file for more information
Error executing cl.exe.

Test.exe - 1 error(s), 0 warning(s)

Re: fatal error C1001: INTERNAL COMPILER ERROR

Fatbuddha 116-Dec-09 2:04

Fatbuddha 1

16-Dec-09 2:04

Suggestions from secrete tool google:

http://www.google.at/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&hl=de&source=hp&q=fatal+error+C1001%3A+INTERNAL+COMPILER+ERROR&meta=&btnG=Google-Suche[^]

Cheers

You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)

Re: fatal error C1001: INTERNAL COMPILER ERROR

wangningyu16-Dec-09 2:29

wangningyu

16-Dec-09 2:29

thanks !

I google is before,but still have no solution.

Cry | :((

Re: fatal error C1001: INTERNAL COMPILER ERROR

Abhi Lahare16-Dec-09 3:09

Abhi Lahare

16-Dec-09 3:09

I got this error few days back (because of code base is complied from mapped network drive)
Once network was OK, Rebuilt and done.
.
HTH
Abhi

Re: fatal error C1001: INTERNAL COMPILER ERROR

Fatbuddha 116-Dec-09 5:55

Fatbuddha 1

16-Dec-09 5:55

No prob, I just thought you might have not.
http://support.microsoft.com/kb/195738[^]

This was just the first hit that I got and I thought it might help.

Cheers

You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)

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