Re: STL Container of classes - ATL / WTL / STL Discussion Boards

Re: CreateThread / CloseHandle cleanly

Paul Farry22-Aug-02 5:29

Paul Farry

22-Aug-02 5:29

thanks so much

set compiler error

_Magnus_22-Aug-02 3:43

_Magnus_

22-Aug-02 3:43

Can anyone explain why i have to use a namespace specifier in the code below?

#include <set>
using std::set;

class myclass
{
  ...
  set<CString,strcmpfn> myset; // no problem
  ...
 
  myfunc()
  {
      ...
      // this gives a compile error, have to be std::set
      set<CString, strcmpfn>::iterator it = myset.find(szPath);
      ...
   }
};

/Magnus

- I don't necessarily agree with everything I say

Re: set compiler error

Michael Dunn25-Aug-02 21:32

Michael Dunn

25-Aug-02 21:32

Add using std::set::iterator;

--Mike--
Just released - RightClick-Encrypt v1.4 - Adds fast & easy file encryption to Explorer
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STL Container of classes

[James Pullicino]21-Aug-02 21:39

[James Pullicino]

21-Aug-02 21:39

Hi,

I tried to make a std::map of classes like this:

<br />
class A<br />
{ ... };<br />
<br />
typedef map<long, A> AMAP;<br />

As soon as I began experimenting I realized that things were not as simple as I hoped. For example, this code:

<br />
AMAP amap;<br />
amap[10];<br />

Will generate 1 call to A's default constructor and two calls to A's copy constructor. Before I continue experimenting to find the best way to make a map of classes I'd like to hear some advice from people who have already tried this sort of thing. Two specific questions I have are:

1) Is it advisable to have a map of classes?
2) Does anyone know the best way to acheive this?

Any other advice/comments/talk about the subject will be appriciated.

P.S. My class will not only consist of built-in types, but will also have pointers.

Thanks,

James

Drinking In The Sun
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Re: STL Container of classes

Anonymous21-Aug-02 22:07

Anonymous

21-Aug-02 22:07

One solution I found was to use pointers instead:

typedef map<long, a="" *=""> AMAP;

amap[10] = new A;

This negates the cost of default and copy constructors. However, it does mean that you then have to manage the deletion of the pointers yourself, as empyting the map will just remove them from the map, not from memory. Unfortunatley, auto_ptr does not work here!

I would be interested to see if there are any other solutions, as it seems to be very costly to use anything other than basic types in a container

Re: STL Container of classes

Neville Franks21-Aug-02 22:40

Neville Franks

21-Aug-02 22:40

I agree that using new and storing pointers is the way to go for any of the STL containers if you don't want the default ctor's and dtor's called unneccessarily. I'd prefer to delete them myself, however the Boost shared_pointer should work fine here, not that I've tried such a thing.

Re. your original question. I guess it depends why you need a collection (multiple instances) of the class in the first place.

Neville Franks, Author of ED for Windows. www.getsoft.com

Re: STL Container of classes

[James Pullicino]21-Aug-02 23:08

[James Pullicino]

21-Aug-02 23:08

I have in fact resorted to pointers for now, which I agree is the best way to go overall.

I would like to find out the best way to have a collection of classes without resorting to pointers, even if it worse than using pointers. I do not have any particular reason why I need a collection of the class - this is purley research.

Thanks,

James

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Re: STL Container of classes

peterchen27-Aug-02 20:32

peterchen

27-Aug-02 20:32

both the default CTor and the 2 copies come from the insertion of a default value, if the requested key is not found. So if you use:

tmap::iterator it = map.find(key);

if (it != map.end())
   // it->second is a ref to the value, you can use, or assign it
else
   // key is not found - what do you want to do?

Frankly, map is my single most used STL class, and I find myself always coding around the operator[].

The two copies come from
1) creating a temp pair<const key,="" value=""> that is passed to insert, and
2) copying the pair<const key,="" value=""> into the map
(frankly, a good library design would not need one of the copies)

You can ignore that if you have classes with "cheap" Copy-CTor's for default-constructed classes, and do complex construction after inserting a default, like this:

value & v = map[10];
v.ReadDataFromHugeFileAndKeepIt();

the same is true for classes that hold System resources (like HANDLE's that are closed in the DTor) and have no acceptable copy contructor.

Peter

One day I might find it quite amusing how touching tongues make life so confusing Anne Clark again [sighist]

Re: STL Container of classes

[James Pullicino]29-Aug-02 23:38

[James Pullicino]

29-Aug-02 23:38

Good advice, thanks.

James

Drinking In The Sun
Forgot Password?

Regular Expression Template Archive

Idefix21-Aug-02 5:30

Idefix

21-Aug-02 5:30

Has someone experience with greta?

void example()
{
string sText="er.r.n.i.e";
match_results results;
rpattern pat("(\\w+\\.)+");
match_results::backref_type brip = pat.match(sText, results);

for(int i=0;i

Re: Regular Expression Template Archive

Neville Franks21-Aug-02 23:06

Neville Franks

21-Aug-02 23:06

Idefix wrote:
I think the parser works but how can i get the single items? Is that possible?

Try:
rpattern pat("{\\w+}\\.");

iterate through your string and extract the text matching the {} tag. Note that I don't know Greta, but this is what you would do with a typical Regex.

Idefix wrote:
Where can I find more documention and information?

Have you tried: http://research.microsoft.com/projects/greta/gretauserguide.htm[^]

Neville Franks, Author of ED for Windows. www.getsoft.com

Activex which itself a control container?

tomer dror21-Aug-02 4:36

tomer dror

21-Aug-02 4:36

Hi,
I want to create ATL control like MS Tab control to use on VB form

How can i create this control in such a way that user can select other controls from VB toolbox and insert it on my control
i tried to register drag and drop target
inside my control but it wouldnt work if user just put the control and not drag it.

i understand that i need to use CComCompositeControl inside my control

but do i need to expose other interfaces for VB?

thanks

tomer

Re: Activex which itself a control container?

Rashid Thadha21-Aug-02 6:11

Rashid Thadha

21-Aug-02 6:11

You need to create an ATL Project from the main wizard, then add the composite control from the 'Add ATL Object' Wizard.

This gives you the basic composition control that you can use in VB.

Professional ATL COM Programming by Richard Grimes has a good chapter on this suject.

OLEMISC_SIMPLEFRAMESITE?

tomer dror21-Aug-02 6:18

tomer dror

21-Aug-02 6:18

Thanks Rashid, i already tried to create a composite control,but it didnot work on vb,i mean i could not add controls to the composite from VB

i found that MFC use OLEMISC_SIMPLEFRAMESITE and
ISimpleFrameSite
to create a simple frame container

thanks.

tomer dror

Re: OLEMISC_SIMPLEFRAMESITE?

Rashid Thadha21-Aug-02 6:39

Rashid Thadha

21-Aug-02 6:39

I recently created a composite control using pure ATL and WTL (No MFC) and I had no problems.

You might need to give me more details on what goes wrong ?

Re: OLEMISC_SIMPLEFRAMESITE?

tomer dror21-Aug-02 7:09

tomer dror

21-Aug-02 7:09

Rashid here is what i did

1.create a composite control
2.put it on a VB form
3.choose a command button control from the VB toolbox and put it on the atl composite control

the result is that the command button control didnot become a child control of the composite control,if i move the composite control the command button control stay in his place

i just want to create a control like SSTab,of FRAME

ATL remove Apply button on Properties...

Braulio Dez20-Aug-02 0:06

Braulio Dez

20-Aug-02 0:06

Hi,

I want to remove the "Apply" button in my ATL properties ( I only want to show the "Ok" button), is that possible without completly rewriting the code for the ActiveX property pages container ?

Thanks in advance, greetings
Braulio

WTL 7 MTPad Example Errors

Ancient Dragon15-Aug-02 19:39

Ancient Dragon

15-Aug-02 19:39

I downloaded the WTL 7 from the link provided in a previous thread. When I tried to compile the MTPad example program using VC6 on XP computer I get 59 errors. There is a message at the beginning that reads:

****************************************************
Compiling...
stdatl.cpp
NOTE: WINVER has been defined as 0x0500 or greater which enables
Windows NT 5.0 and Windows 98 features. When these headers were released,
Windows NT 5.0 beta 1 and Windows 98 beta 2.1 were the current versions.
For this release when WINVER is defined as 0x0500 or greater, you can only
build beta or test applications. To build a retail application,
set WINVER to 0x0400 or visit http://www.microsoft.com/msdn/sdk
to see if retail Windows NT 5.0 or Windows 98 headers are available.
See the SDK release notes for more information.
Compiling...
****************************************************

Then it produces lots of errors. I'll only show the first one.

****************************************************
mtpad.cpp
c:\wtl70\include\atlframe.h(274) : error C2146: syntax error : missing ';' before identifier 'lpnm'
c:\wtl70\include\atlframe.h(905) : see reference to class template instantiation 'WTL::CFrameWindowImplBase<tbase,twintraits>' being compiled
c:\wtl70\include\atlframe.h(274) : error C2501: 'LPNMREBARCHEVRON' : missing storage-class or type specifiers
****************************************************

Re: WTL 7 MTPad Example Errors

Paul M Watt15-Aug-02 19:58

Paul M Watt

15-Aug-02 19:58

I believe that you will need to load the latest version of the windows SDK.

First off, the note about WINVER 5.0 means that the program enabled all of the features only available in Windows 2000 and above.

Second, I get the same basic set of errors, I only get about 14 errors though.

LPNMREBARCHEVRON is not defined in any of the header files that I have as well as IPrintDialogCallback and PRINTERDLGEX, but I believe they will be found in the latest header files in the SDK.

Good luck!

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: WTL 7 MTPad Example Errors

Stuart Dootson15-Aug-02 20:51

Stuart Dootson

15-Aug-02 20:51

I've just had a look in the SDK on my PC (May 2002) and all those symbols are defined (well, PRINTDLGEX, not PRINTERDGLEX).

It's a big download, but it's worth it in the long run.

Stuart Dootson

'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'

Re: WTL 7 MTPad Example Errors

Ed Gadziemski19-Aug-02 12:07

Ed Gadziemski

19-Aug-02 12:07

If you don't have the latest SDK, change the WINVER define in stdafx.h to 0x0400 and that will eliminate the errors. However, you won't be able to use the IE-style chevron and a few other new toys.

owner-draw menu

Gabriel.P.G13-Aug-02 12:57

Gabriel.P.G

13-Aug-02 12:57

Hi, i want to program an owner-draw popup menu class with WTL. My actual implementation inherits from CMenu, COwnerDraw and CMessageMap, and the user of the class chains to the msg map of the menu class. But it seems to me that is an overkill, i mean, if i´m getting it right ( i don´t really know ), i´m getting all the messages from the parent window of the class just to process DrawItem and MeasureItem. I don´t know much about WTL, so i suppose there is a better design solution...

Any ideas???

Gabriel

Old C programmers never die. They just cast into void

Re: owner-draw menu

Michael Dunn13-Aug-02 13:13

Michael Dunn

13-Aug-02 13:13

That's how message maps work in general. Throw everything at them, and the class acts on only the messages it's interested in.

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
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ATL Service and hidden windows

Michael P Butler13-Aug-02 1:09

Michael P Butler

13-Aug-02 1:09

I have an ATL service (ATL 3). I'd like to create a hidden window to send messages to from one of my threads.

What is the best way to approach this? Is WTL needed or would the standard ATL window classes do the job?

Any recommended reading and examples so that I can understand the principles better?

Michael Smile | :)

Time flies like an arrow. Fruit flies like a banana

Re: ATL Service and hidden windows

Michael Dunn13-Aug-02 13:14

Michael Dunn

13-Aug-02 13:14

For a plain-jane window, just use CWindowImpl.

class CMySvcWindow : public CWindowImpl<CMySvcWindow>

and give it a message map.

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

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