Is there any way to verify a HHOOK? - C / C++ / MFC Discussion Boards

Re: Which Performance value for checking leakage?

S. Senthil Kumar7-Dec-05 1:09

7-Dec-05 1:09

Virtual bytes should be fine. It represents the total address space used up by the application, including memory mapped files, DLLs, EXEs etc.

Regards
Senthil
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Re: Which Performance value for checking leakage?

Graham Bradshaw7-Dec-05 2:35

Graham Bradshaw

7-Dec-05 2:35

I would suggest you monitor Private Bytes and Handle Count (private bytes for memory leaks and handle count for handle leaks)

Re: Which Performance value for checking leakage?

S. Senthil Kumar7-Dec-05 5:34

S. Senthil Kumar

7-Dec-05 5:34

But private bytes wouldn't show leaks like memory mapped files which didn't get unmapped. Admittedly, such leaks are rare, but why take the risk?

Regards
Senthil
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Re: Which Performance value for checking leakage?

Graham Bradshaw7-Dec-05 5:59

Graham Bradshaw

7-Dec-05 5:59

I was suggesting additional counters, not replacements. It's useful to monitor Private Bytes and Virtual Bytes, because how one changes relative to the other gives further clues about the nature of the leak.

How to add and remove a toolbar?

Franken6-Dec-05 23:56

Franken

6-Dec-05 23:56

Hi folks,

I've written and SDI program. In this program I've created a dialogbar and added it to a rebar control in the OnCreate method in CMainFrame. I would like to have the ability to let this control appaer and disappaer with a click in the view menu but I don't know how to do this.

Thanks for your help.

Re: How to add and remove a toolbar?

kakan7-Dec-05 1:07

kakan

7-Dec-05 1:07

Have you tried
GetDlgItem(TOOLBAR_ID)->ShowWindow(SW_SHOW|SW_HIDE)

Re: How to add and remove a toolbar?

Franken7-Dec-05 1:12

Franken

7-Dec-05 1:12

yes, I've tried it and it shows and hide the dialogbar but the additional rebar control for this dialogbar is still visible.

Is there any way to verify a HHOOK?

Abin6-Dec-05 23:49

Abin

6-Dec-05 23:49

In a recent project I used WH_JOURNALRECORD to moniter certain events occur in a particular application window, but as MSDN said, as soon as the user press "CTRL+ESC" or "CTRL+ALT+DEL", all installed WH_JOURNALRECORD hooks will be wiped out by the OS... When this happens, my application does not know, so it would still wait for messages(which will never come anymore) from the target window.

My questions is that, is there any way to verify whether a HHOOK handle is still on a "valid" state, so I can reinstall the hook if needed? Thanks

Re: Is there any way to verify a HHOOK?

S. Senthil Kumar7-Dec-05 1:15

S. Senthil Kumar

7-Dec-05 1:15

=[ Abin ]= wrote:
When this happens, my application does not know, so it would still wait for messages(which will never come anymore) from the target window.

You actually can detect eviction of the hook by the OS. From this[^] article,
"Windows sends a WH_CANCELJOURNAL Windows message when it evicts the hook. The trouble is, the message doesn't have a Windows handle, i.e., it is not directed at any window, so how do we get to know about it? By now, the answer should be obvious, use another systemwide hook, this time a Windows Message Hook (idHook = WH_GETMESSAGE). This hook will get called whenever any Windows application calls GetMessage or PeekMessage, so we can catch WH_CANCELJOURNAL there and inform our UI that recording/playback has been interrupted."
If you want source code, you can take a look at the linked article.

Regards
Senthil
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Re: Is there any way to verify a HHOOK?

Abin7-Dec-05 1:43

Abin

7-Dec-05 1:43

You are a lifesaver!

Re: Is there any way to verify a HHOOK?

Abin7-Dec-05 3:29

Abin

7-Dec-05 3:29

Well, for some odd reasons the GetMsgProc function in my application was never called, even though SetWindowsHookEx(WH_GETMESSAGE,GetMsgProc,m_hInstance,0) had succeeded... Weird isn't it?

It was an MFC dialog based application.

Re: Is there any way to verify a HHOOK?

S. Senthil Kumar7-Dec-05 4:07

S. Senthil Kumar

7-Dec-05 4:07

One possibility is that some other app installed a GETMESSAGE hook and is not forwarding it to subsequent hooks in the chain.

I also realized that my code (the one in the article) is potentially buggy. According to MSDN, global hooks, except for journal hooks, need to reside in a DLL. But my GetMsgProc doesn't. Could you try making it a thread specific hook instead, by providing the current thread id as the last parameter?

Regards
Senthil
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Re: Is there any way to verify a HHOOK?

Blake Miller7-Dec-05 5:06

Blake Miller

7-Dec-05 5:06

If he makes it a thread-specific hook, then it might still not receive the expected message notifying the journal hook was cancelled. Better to make it global and place it in a DLL.

No shirt, no shoes, no brains, no service.

Re: Is there any way to verify a HHOOK?

S. Senthil Kumar7-Dec-05 5:24

S. Senthil Kumar

7-Dec-05 5:24

The MSDN[^] documentation does say that Windows sends the message to the application that set the journal hook, so I guess a thread hook should be okay.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Is there any way to verify a HHOOK?

Blake Miller7-Dec-05 5:34

Blake Miller

7-Dec-05 5:34

The hook's thread identifier should be the same thread identifier as the thread containing the window that will receive the message. If you set the hook from some secondary thread, it might not receive the message.

No shirt, no shoes, no brains, no service.

Color processing

Dk_20006-Dec-05 23:42

Dk_2000

6-Dec-05 23:42

I have CDC* or HDC.
I want to change any color parameters such as contrast.
Please help me.

Dk_2000

Re: Color processing

Matt Godbolt7-Dec-05 1:55

Matt Godbolt

7-Dec-05 1:55

Hi; you'll need to get an RGB (red, green, blue) colour for the element you wish to alter; and then once you have that RGB you'll need to run various algorithms on it to adjust contrast, colour etc.

One way of doing this is to convert the RGB colour into hue, saturation and value space (HSV - see link on wikipedia below). Once as an HSV value, adjusting the saturation is similar to adjusting the 'colour' on your TV. Adjusting the 'value' adjusts brightness, and if you apply a non-linear function (like raise-to-a-power) to the value, you can get a constrast effect. (more: on the Wikipedia)

Once you've adjusted the HSV value you'll need to convert it back to RGB, then set it back into your HDC.

Matt Godbolt
Engineer, ProFactor Software
StyleManager project

Re: Color processing

C^hris L^osinger7-Dec-05 2:13

C^hris L^osinger

7-Dec-05 2:13

here's how you do a gamma adjustment:

double fGammaInverse = 1.0 / fGammaAdjust;
BYTE lut[256]
for each pixel, p
  for each color component c in p
    double ind = (double) c / 256.0;
    c = (BYTE) (256 * pow (ind, fGammaInverse));

Cleek | Image Toolkits | Thumbnail maker

Porting from WIN32 to MAC: HELP

vishix16-Dec-05 23:17

vishix1

6-Dec-05 23:17

I have made an application which can convert PPT slides to JPG images using powerpoint type library.
Now i want to port the application to MAC. I m not able to find any developing environment in which i can port it to mac. I have a MAC G4 iBook and Office 2004 for MAC .. Please help me...

my mail address is catbbs7@yahoo.com

Regards

Vishal

Documentation in VC++

vikas amin6-Dec-05 23:11

vikas amin

6-Dec-05 23:11

do any one know any good method or
have good tips for doing documentation
of VC++ code

thank you
Cool | :cool:

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Re: Documentation in VC++

Cedric Moonen6-Dec-05 23:19

Cedric Moonen

6-Dec-05 23:19

Doxygen[^] is a usefull tool for that. I just used it once but it was working quite well. I think there is a tutorial (not sure anymore) on codeproject about how to use it and how to integrate it with VC++.

Re: Documentation in VC++

G. Steudtel7-Dec-05 0:54

G. Steudtel

7-Dec-05 0:54

Hi,

probably you might try this one?

GSte

Re: Documentation in VC++

toxcct7-Dec-05 0:58

toxcct

7-Dec-05 0:58

seems that you forgot the link...

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20] | soon : [VisualCalc 3.0]

Re: Documentation in VC++

G. Steudtel7-Dec-05 0:58

G. Steudtel

7-Dec-05 0:58

Sorry forgot the link: http://www.codeproject.com/tools/HeaderDocumentor.asp[^]
GSte

Re: Documentation in VC++

peterchen7-Dec-05 1:02

peterchen

7-Dec-05 1:02

I recommend doxygen as well.

Here[^] you find one of my articles how to get started Cool | :cool:

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