C / C++ / MFC Discussion Boards

Re: Advice on Enumerating and Searching Folders Needed

ColinDavies31-Jan-04 20:55

31-Jan-04 20:55

Roger Wright wrote:
Should I enumerate the top level folders and process them first, then move down a layer and repeat, or should I follow a directory chain to its end before processing the next top level folder?

I don't think it will make any difference, to the outcome, if you do it right.

Regardz
Colin J Davies

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Re: Advice on Enumerating and Searching Folders Needed

Neville Franks31-Jan-04 22:58

Neville Franks

31-Jan-04 22:58

Directory searches are typically done using a recursive routine and going depth first. Using this approach you don't need to keep track of where you've been. You can get into a mess if you are moving files around etc. under the feet of code that is iterating files. It can be easier and certainly safer to use two passes, one to build the list of files that need to be moved (or whatever) and a second to do the work.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: Advice on Enumerating and Searching Folders Needed

Roger Wright1-Feb-04 3:22

Roger Wright

1-Feb-04 3:22

Good thought, and similar to the approach I was discussing with Colin in the wee hours this morning. But then it occurred to me (apparently in my sleep I was still working on it) this morning that the app could get really confused if some process made a change to the file structure after the first pass. That's probably a small risk, though. It might be entertaining and instructive to populate a tree control on the first pass and display it, then expand each node as it is being processed, changing colors or something to indicate completion. It certainly will be a good exercise for my edification! Smile | :)

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Boost smart pointers - can I do this?

Neville Franks31-Jan-04 19:04

Neville Franks

31-Jan-04 19:04

I'm using code like the following to Post some information and instead of using new and delete I'd like to use a smart pointer so I don't need to manually do the delete. I've read over the Boost smart pointer library but can't really see if this is possible. I do use boost scoped_ptr<> to good effect.

CMyClass::MyFunc()
{
   CMyClass* pMyClass = new CMyClass;
   PostMessage( WM_USER_MYMSG, reinterpret_cast<WPARAM>( pMyClass ), 0 );
}

// Message handle for WM_USER_MYMSG
LRESULT CMainFrame::OnUser_MyMsg( WPARAM wParam, LPARAM lParam )
{
    CMyClass* pMyClass= reinterpret_cast<CMyClass*>( wParam );
    // do stuff with pMyClass
    delete pMyClass;   // I want to loose this!!
}

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: Boost smart pointers - can I do this?

Joaquín M López Muñoz1-Feb-04 2:12

Joaquín M López Muñoz

1-Feb-04 2:12

Well, you can modify the receiving code like this:

LRESULT CMainFrame::OnUser_MyMsg( WPARAM wParam, LPARAM lParam )
{
  boost::scoped_ptr<CMyClass> pMyClass(reinterpret_cast<CMyClass*>(wParam));
  // do stuff with pMyClass, no need to explicitly delete
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Boost smart pointers - can I do this?

Neville Franks1-Feb-04 12:01

Neville Franks

1-Feb-04 12:01

Hi Joaquín,
Thanks for the reply. I assume you mean by changing the new to use a boost smart ptr. If so which one, shared_ptr?

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Create a Popup IE window from C++

Shutter31-Jan-04 16:32

Shutter

31-Jan-04 16:32

I know I can launch an HTML page with IE by using ShellExecute. But how do you create a popup window that doesn't have toolbars, status bar, etc.? Much like window.open in javascript.

Re: Create a Popup IE window from C++

Neville Franks31-Jan-04 18:52

Neville Franks

31-Jan-04 18:52

Shutter wrote:
I know I can launch an HTML page with IE by using ShellExecute. But how do you create a popup window that doesn't have toolbars, status bar, etc.? Much like window.open in javascript.

You can create a dialog and embed the MSHTML control in it. See: http://msdn.microsoft.com/downloads/samples/internet/default.asp?url=/downloads/samples/internet/browser/htmldlg/default.asp[^] amonst others on MSDn and here on CP.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Adobe Acrobat Reader OCX problem

Alex Korchemniy31-Jan-04 16:23

Alex Korchemniy

31-Jan-04 16:23

When I load a xfdf file into the control it stops responding. This is strange since acrobat reader.exe loads xfdf's without a hitch. Anyone have a solution or ran into this before?

Re: Adobe Acrobat Reader OCX problem

S^nyp31-Jan-04 16:59

S^nyp

31-Jan-04 16:59

I don't understand... are you trying to implement the OCX on your application? Or is it that your getting an error with Adobe Acrobat Reader.. you should ask them, but if you mean like using it in your own application... I think you need a license for it and there is a lot of security built into it, probably the Adobe style Smile | :)

anyways, you should ask them for more info.

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Re: Adobe Acrobat Reader OCX problem

Alex Korchemniy31-Jan-04 17:14

Alex Korchemniy

31-Jan-04 17:14

Very simple. Just drop the activex control from adobe acrobat reader into a form. When the src property is set to the path of an xfdf file the control hangs. Note that xfdf files are fully supported in the (free) adobe acrobat reader.exe.

&*%&*&(*)$)(#@*& Edit box problem!

Terry O'Nolley31-Jan-04 16:11

Terry O'Nolley

31-Jan-04 16:11

I have a long CString that I am displaying in a multi-line edit box control using m_EditBoxVarName.SetWindowText("string");

Works great except that the line breaks (which I have as \n) show up as squirrely little vertical lines.

How do you format a CString so that the Edit Box will display:

This is the first line!
This is the second line!

instead of:

This is the first line!|This is the second line!

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Re: &*%&*&(*)$)(#@*& Edit box problem!

S^nyp31-Jan-04 16:18

S^nyp

31-Jan-04 16:18

I forgot myself but I think its something like \n\t or something like that... Can anyone else help? I don't have alot of time to look into this problem since I am programming with DX and forgot some MFC.

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Re: &*%&*&(*)$)(#@*& Edit box problem!

Terry O'Nolley31-Jan-04 16:54

Terry O'Nolley

31-Jan-04 16:54

I got it - thanks. It is \r\n I forgot about PCs needing that extra character.

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Re: &*%&*&(*)$)(#@*& Edit box problem!

Jim Crafton1-Feb-04 14:05

Jim Crafton

1-Feb-04 14:05

As an FYI if you use the richedit control you won't run into this. It can handle \n, \r, or \n\r without a problem. It's only the simple edit control that is this brain dead.

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C++ Question.

WREY31-Jan-04 13:04

WREY

31-Jan-04 13:04

Is there a (shortcut) way to convert a numeric to a character? For example, a numeric 9 to a character "9", or a numeric 365 to a character "365".

Neither 'static_cast', 'reinterpret_cast', nor '(char)' does it, and it doesn't matter if the number is signed or unsigned, no cast seems to do it.

Thanks for any insight.

Smile | :)

William

Fortes in fide et opere!

Re: C++ Question.

User 665831-Jan-04 13:24

User 6658

31-Jan-04 13:24

_itoa(), _ltoa(), _ultoa() or simply sprintf() Smile | :)

modified 12-Sep-18 21:01pm.

Re: C++ Question.

WREY31-Jan-04 13:32

WREY

31-Jan-04 13:32

Thanks for replying.

itoa() did it!!

I appreciate the help.

Smile | :)

William

Fortes in fide et opere!

Libraries

Darek Ali31-Jan-04 12:51

Darek Ali

31-Jan-04 12:51

Recently I tried to compile a file with Devcpp, but I couldn´t because it doesn´t have file.h.
do you know what compiler has this libraries?

Thanx!

Max command line length

Jon Sagara31-Jan-04 12:39

Jon Sagara

31-Jan-04 12:39

From CreateProcess's documentation I have gathered that the max command line length is 32K. Is there a predefined macro similar to _MAX_PATH, or do I have to define my own?

Jon Sagara
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Re: Max command line length

Neville Franks31-Jan-04 18:56

Neville Franks

31-Jan-04 18:56

Jon Sagara wrote:
From CreateProcess's documentation I have gathered that the max command line length is 32K. Is there a predefined macro similar to _MAX_PATH, or do I have to define my own?

Not that I am aware of. Also be aware that different (older) versions of windows have much shorter command line length limits.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: Max command line length

Jon Sagara31-Jan-04 21:45

Jon Sagara

31-Jan-04 21:45

Thanks for the response, Neville.

Neville Franks wrote:
Also be aware that different (older) versions of windows have much shorter command line length limits.

We specifically target Win2k and above. By older, do you mean Winnt4 and Win9x/Me?

Jon Sagara
Vegetarianism is unhealthy. Humans need protein, and lots of it. Put down those sprouts and pick up a T-bone!
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Re: Max command line length

Neville Franks31-Jan-04 22:52

Neville Franks

31-Jan-04 22:52

Jon Sagara wrote:
We specifically target Win2k and above. By older, do you mean Winnt4 and Win9x/Me?

I can't recall when it increased by I think you're fine with W2K and later.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: Max command line length

Jon Sagara1-Feb-04 3:46

Jon Sagara

1-Feb-04 3:46

Cool. Thanks again.

Jon Sagara
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Dialog

Member 75213731-Jan-04 12:21

Member 752137

31-Jan-04 12:21

How can I write a text in a dialog with a different class this mean without use a default class ( Dlg )

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