C / C++ / MFC Discussion Boards

vc++

8-Jan-01 8:49

why flickering during motion of text

Re: vc++

Christian Graus8-Jan-01 11:04

Christian Graus

8-Jan-01 11:04

given the great depth of information provided, I would suggest one of the following

1/ you are drunk

2/ your monitor is stuffed

3/ your glasses are dirty

4/ you need glasses

5/ you have a nervous twitch

6/ presuming for a moment that you are moving text in a window, the problem may be ( making gross assumptions about what you are doing and what your code looks like ) that you are using the dc provided in OnPaint directly ( or OnDraw ), when you should be drawing to a memory dc and blting it in one go, or using onPrepareDC, depending on which of the two methods mentioned you may, or may not be using.

In other words, I might know the answer, but it's hard to tell if you are not going to bother giving any details when asking the question.

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Re: vc++

Marc Richarme9-Jan-01 9:11

Marc Richarme

9-Jan-01 9:11

Try to do something like this in the drawing routine:

CPaintDC dc(this); // device context for painting<p>
Crect rcClient;
GetClientRect(&rcClient);<p>
// create memory DC
CDC memDC;
memDC.CreateCompatibleDC(&dc);<p>
// create bitmap
CBitmap memBmp;
memBmp.CreateCompatibleBitmap(&dc,rcClient.Width(),rcClient.Height());<p>
// select bitmap into memory DC
CBitmap *pOldBmp = memDC.SelectObject(&memBmp);<p>
//
// Add your drawing code here, but instead of drawing to dc, use memDC
// f.e. instead of doing dc.DrawText(...); use memDC.DrawText(...);
//<p>
// copy content of memory DC back to paint DC
dc.BitBlt(0,0,rcClient.Width(),rcClient.Height(),&memDC,0,0,SRCCOPY);
memDC.SelectObject(pOldBmp);

Hope you can use this.

Enjoy!

Marc

vc++

8-Jan-01 8:47

why flickering during motion of text

HtmlHelp

8-Jan-01 7:24

Hi,
I am trying to invoke HtmlHelp from a MFC SDI Application by using the 'HtmlHelp' API call. I have obtained a compiled html file (*.chm) from a third party. The problem is that when I invoke HtmlHelp, it comes up fine but when the application terminates (Normal shut down - pressing the close button of the FrameWnd) an exception is raised (in debug version of the application, a debug assertion is raised).
I have tried creating a sample MFC (SDI) exe and call the *.chm file from it. In this case it works fine. So I guess there must not be any problem with the *.chm file
Regarding my application, some points are
1. I am using Sting Ray Objective Grid to implement Grid facility in some dialogs
2. When my application was initially generated using MFC AppWizard, I had selected Context-Sensitive Help. But I am not using that anymore as I am going for HtmlHelp. Is there any way to turn Context-sensitive Help off. Could that be causing the problem?
3. Is there anything specific to be taken care when 'HtmlHelp' API is used? I have tried using NuMega BoundsChecker to locate the problem. BoundsChecker says that 'possible wrong usage of CreateThread function, _beginthreadex has to be used' Does HtmlHelp API create a new thread by itself?

I would be grateful if any one can help me out...
Thanks,
Unni

Re: HtmlHelp

Tim Deveaux10-Jan-01 7:06

Tim Deveaux

10-Jan-01 7:06

What's the ASSERTion?

Possibly involved with trying to free up the help path string, which is now kafuffed (sp) because you are bypassing the regular help init? BoundsChecker would probably flag that one as well though. Press 'retry' on the assert dialog...

HTMLEncode is VC++

JoeW8-Jan-01 5:12

JoeW

8-Jan-01 5:12

I wonder if anybody can help.
I want to do an HTMLEncode in VC++ with minimal runtime dependencies. A lot of ASP/Site Server/Index Server objects have this - but surely this is a utility function and shouldn't be associated with a server instance ?
Does anybody have any code to do this, or know of any library routines - that will probably be installed on the client machine ?

TIA

JoeW

"Open with..." dialog

8-Jan-01 2:03

Does anyone know how to display the "Open with.." dialog? The solution doesn't have to be MFC - a hint towards the solution would be great.

With best regards,
Daniel

Re: wopen with dialig

10-Jan-01 6:35

You can open the dialog the following way:

At the dos prompt: start <filename>

If filetype (extension) does not have a registered application, the openwith dialog will open automatically.

Mark.

Re: oopen

10-Jan-01 6:36

OOps, part of the command did not show, it is:

start filename.ext

Re: oopen

11-Jan-01 10:27

usually the files are asociated with some EXE in the registry. So if you want a file with any certain extension to be not associated with any EXE or in case you want to change the associated entry; then must you go to the registry using the regedit by going to Start->Run and typing it in the open box.

You have to find the extension of the file you want to change, then delete the old registry and come back and right click on the desired file
and there you go! The Open With... option is in the menu! Smile | :)

Re: wopen with dialig

13-Jan-01 3:04

First, I'm pretty sure he wanted to know how to get the open with dialog from code (i.e. double click on a file name and if there's no associated .exe, then open the dialog for them to choose an app).

Second, you don't need to go to all that trouble to get open with... on the right-click menu. Just hold down shift when you right click the file.

As for the answer to the first question, I really hope someone will figure that out and post it...

RichEditCtrl

7-Jan-01 23:40

Hello,

I want to add my own OLE object into a RichEditCtrl directly ( not via
insert dialog).

How can I do ???

Thanks

Pascal

Antialiasing question

neil7-Jan-01 23:24

neil

7-Jan-01 23:24

Hi,

Does anyone know how to send a message or set a style for a control (such as a RichEdit box) to turn on/off antialiasing?

Thanks

Neil

Re: Antialiasing question

l a u r e n11-Jan-01 22:11

l a u r e n

11-Jan-01 22:11

as far as i understand font anti-aliasing is a system-wide property available if you are running in hi-color mode or better ... i would have no idea how to switch it on / off for an individual control or if thats even possible
Suspicious | :suss:

mostly watching the human race is like watching dogs watch tv ... they see the pictures move but the meaning escapes them

Re: Antialiasing question

11-Jan-01 23:41

Why reply then...

Persistent CFileDialog

Mark de Leeuw7-Jan-01 4:31

Mark de Leeuw

7-Jan-01 4:31

For a project i need to make a persistent file open dialog. I mean i want to remember the latest view mode (icon,detail,thumbnail) and if in detail then also the latest sort order. I thought of 2 possible ways to handle this.

1. I found out that the list control is created throught COM. MSDN states that a IShellBrowser interfaces is exposed by the common dialog. through IShellBrowser you can get a IShellView and call it's SaveViewState() member. But how do you get the IShellBrowser object ??

2. Using a message hook and try to intercept the column click messages, and the menu commands sent when the user changes the view-mode through the toolbar button and the then popped up menu. But i can't see/find thoose messages ...

Any help would be appreciated.
Gr. Mark
Confused | :confused:

Keyboard hook

6-Jan-01 23:44

I am using a keyboard hook and everything is getting called correctly except I can't seem to change the keycode for instance when you press 'a' i want the output to be 'z' ... here is my code for the KeyboardProc()

LRESULT LOCKSCR_API CALLBACK KeyProc(int nCode, WPARAM wParam, LPARAM lParam)
{
return CallNextHookEx(hKeyHook, nCode, wParam, lParam);
}

I've tried returning CallNextHookEx(hKeyHook, nCode, (WPARAM) 'z', lParam);

but it seems to ignore the 'z' and get the wParam from somewhere else anyways.

any help would be appreciated.

Thanks,
Vince

BACKGROUND THREAD

5-Jan-01 15:37

How can I create an invisible thread? I mean I want my thread not to be visible when you press CTRL+ALT+DEL. For example kernel32.dll is such a thread. If I create a thread within an application, my app name is shown when I press ctrl+alt+del. If I terminate the application, the thread is automaticaly terminated too. I heard that in UNIX you can leave a thread running forever (zombie thread). What is the equivalent of this for Visual C++ (MFC) ???

Sorin
PS: pls answer to subso@yahoo.com Thankss

Re: BACKGROUND THREAD

Jonahtan1-Feb-01 8:16

Jonahtan

1-Feb-01 8:16

ah it seems that im at the same road block
but i cant get my dll(thread) to evan start Confused | :confused:

Spell Checker - array list speed improvements

Peter Pearson5-Jan-01 11:43

Peter Pearson

5-Jan-01 11:43

I recently needed a spell checker for one of my applications, and after trying to find one that existed already, DLL, ActiveX etc, and using OLE and Word to do things, I decided to make one myself.

I started, but after experimenting, decided I needed a dictionary first to test results accurately, so for the last four months I've been compiling one (almost 75,000 words - UK English).

I'm using a CObArray to store the words, and this was fine to begin with until I got to around 15,000 words, and then things slowed down drastically.

What I'm basically doing is finding each word in a text box, then going through the dictionary list (the CObArray) and see if it exists, otherwise try and find words that start with the same characters from the left.

It's so slow though, it's completely unusable, and the intelligence is ridiculous (I also need to do things like vowel swapping, etc.)

I'd just like to know what the best way speed wise is of using an array or list - I've never had any problems before, but that was will arrays < 20,000.

I'm using MFC (CStrings and all that), so that's probably half the problem, but even trying chars and strncmp etc. didn't really make that much of a difference.

I was going to post the project to CodeProject when I'd finished, but since it's slow, doesn't work, and the code probably needs a complete re-write and I haven't got the expertise in that area, is it worth just submitting the code and project anyway, and everyone has a look and tries to improve it?

Regards,
Peter Peason

Re: Spell Checker - array list speed improvements

David Cunningham5-Jan-01 12:03

David Cunningham

5-Jan-01 12:03

Peter,

My vote is go ahead and post it, I think it will be a project that quite a few people would like to spend some brain-time on. I'd be clear in the opening paragraph of your article that you're posting it to encourage people to help improve and refine it, I've noticed that people can be pretty harsh here sometimes (which certainly has the effect of keeping the quality high, but can be daunting to those considering making a submission).

I for one would love to add a spell checker to CodeProject's forums and lounge, so if you post your code maybe that would make for a good starting point Smile | :)

David

Re: Spell Checker - array list speed improvements

Steve Driessens5-Jan-01 13:40

Steve Driessens

5-Jan-01 13:40

G'day Peter,

I know next to nothing about spell checker implementation and you may already know about this stuff, but here goes...

I suspect that some spell checkers may use a Soundex[1] algorithm (or variation thereof) to encode their master word list. When checking the spelling on an individiual word, you'd generate a soundex code for the check word, and look for words with matching soundex codes in your master word list. This soundex comparison search may turn up lots of 'hits', but you could then refine matters bu searching the soundex hit list with a more exact word comparison.

[1] Soundex encodes the 'sound' of words by sripping out the vowels and representing similar sounding consonants with numerics (i.e 'd' and 't' are represented by the numeral 3) . A search on Google for 'soundex algotithm' will turn up plenty of pages detailing the original Soundex algorithm and several refined versions.

Hope this helps,
Steve

--------------------------------------
Steve Driessens

Re: Spell Checker - array list speed improvements

Peter Pearson8-Jan-01 11:41

Peter Pearson

8-Jan-01 11:41

Hi,

Thanks for the information - I notice that Matt Gullett also posted an article on using this type of algorithm in spell checkers, so I'll have a look around.

Regards,
Peter

Re: Spell Checker - array list speed improvements

Wilka5-Jan-01 13:46

Wilka

5-Jan-01 13:46

Programming Pearls 2nd (ISBN 0201657880) has a section that will probably be useful for this (column 13), you should probably take a look if you can.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.