ATL / WTL / STL

Re: XP Themes not woking in an ActiveX control in IE

21-Jan-04 13:03

Ah, I think you also need to #define ISOLATION_AWARE_ENABLED 1 in stdafx.h before all #includes. Check out this article[^] for all the hairy details.

--Mike--
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Jason De Arte21-Jan-04 14:37

Jason De Arte

21-Jan-04 14:37

Wow, thanks Michael - that did the trick!

I removed my ComCtl32.lib linker entry & the call to InitCommonControls & it still worked!

So for future users that are having similar issues, All I needed for my ActiveX control was..
* A valid manifest resource type=24 with an ID=2
* #define ISOLATION_AWARE_ENABLED 1 in stdafx.h before all other #includes

(I think that this is the article[^] you ment)

Now I just want to know what the heck all this isolation stuff is & why it added 4k to the size of my DLL Poke tongue | ;-P

I'll google for it later.

putting template objects in a container

Joo Andras19-Jan-04 3:33

Joo Andras

19-Jan-04 3:33

(This is the correct version, with < >) Smile | :)

)

Hi,

Consider the following template

template<typename T>
class X
{
//...
};

Now, I would like to put pointers to the different instantiations of the above template for ex

X<int>* xi;
X<double> *xd;

in a single stl container, let's say a vector. Can I do it in an elegant way ?
(Well, actually I can, using a vector<void*>. But after that how do I get back my objects ?)

Thank you,

Andras

Joaquín M López Muñoz19-Jan-04 6:15

Joaquín M López Muñoz

19-Jan-04 6:15

This can be handled in a number of ways that depend on what you want to do with these objects later. Probably the most obvious solution is to write an abstract class from which all X instantiations derive from, and use this as the type of the pointers stored in te container:

class X_base
{
  virtual foo()=0;
  ...
}
 
template <class T>
class X: public X_base
{
  ...
};
 
vector<X_base*> X_vector;

Is this suitable for you?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Joo Andras19-Jan-04 21:14

Joo Andras

19-Jan-04 21:14

Yes, making an abstract base class solves my problem.
But I'm curiuos what other solutions might exist.

Andras

Lim Bio Liong20-Jan-04 5:02

Lim Bio Liong

20-Jan-04 5:02

Hello Joo,

I think Joaquin's solution is really cool. But I think we may have missed your earlier concern : how to obtain the actual derived class object contained within the vector.

If we used a vector of pointers to X_base objects, we will obtain only pointers to X_base objects when we iterate through the vector.

We need to be able to determine at runtime the following information :

1. What is the X_base-derived-template-class of each vector item.

2. What is the type that is actually used to instantiate the X_base-derived template class (in your earlier example, this is actually 'int' or 'double').

Inspired by Joaquin, I went on to refine his example source codes and produced the following :

#include <vector>
#include <iostream>
#include <typeinfo.h>

using namespace std;

class X_base
{
public :
X_base()
{
}

virtual operator const type_info&() = 0;
};

template <class T>
class X: public X_base
{
public :
typedef T MyType;

X(MyType t) :
m_t(t),
m_ti(typeid(t))
{
}

virtual operator const type_info&()
{
return m_ti;
}

MyType& GetValue()
{
return m_t;
}

protected :

MyType m_t;
const type_info& m_ti;
};

typedef X<int> X_int;
typedef X<double> X_double;
typedef std::vector<X_base*> X_base_vector;

int _tmain(int argc, _TCHAR* argv[])
{
X_int* pxi = new X_int(5);
X_double* pxd = new X_double(0.85);
X_base_vector x_base_vector;
X_base_vector::iterator theIterator;
const type_info& ti_int = typeid(int);
const type_info& ti_double = typeid(double);
int i = 0;

cout << ti_int.name() << endl;
cout << ti_double.name() << endl;

x_base_vector.push_back(pxi);
x_base_vector.push_back(pxd);

for (theIterator = x_base_vector.begin(); theIterator != x_base_vector.end(); theIterator++)
{
X_base* px = *theIterator;

if (ti_int == (const type_info&)(*px))
{
X_int* pxi = dynamic_cast<X_int*>(px);

cout << "px == X<int>" << endl;
cout << "Value : " << pxi -> GetValue() << endl;
}

if (ti_double == (const type_info&)(*px))
{
X_double* pxd = dynamic_cast<X_double*>(px);

cout << "px == X<double>" << endl;
cout << "Value : " << pxd -> GetValue() << endl;
}

cout << ((const type_info&)(*px)).name() << endl;
}

return 0;
}

Essentially, I used Run-Time-Type-Information (RTTI) to help determine the class (X_base-derived) of each vector item as well as to determine the type that is actually used to instantiate the X_base-derived template class.

Hope the above code will be helpful to you and Joaquin.

Thanks,
Bio.

different template objects into a container

Jörgen Sigvardsson19-Jan-04 12:15

Jörgen Sigvardsson

19-Jan-04 12:15

You could also use the boost::any as container item type. Please see http://www.boost.org/doc/html/any.html[^] for more information.

If you think this is something you would like to use, then you do not need to download the entire boost source code. You can download any.hpp and use it. No link libraries required.

--
Seraphim Shock. Gold for your ears.

Joo Andras19-Jan-04 3:27

Joo Andras

19-Jan-04 3:27

Hi,

Consider the following template

template<typename t="">
class X
{
//...
};

Now, I would like to put pointers to the different instantiations of the above template for ex

X<int>* xi;
X<double> *xd;

in a single stl container, let's say a vector. Can I do it in an elegant way ?
(Well, actually I can, using a vector<void*>. But after that how do I get back my objects ?)

Thank you,

Andras

How to load a MFC dll to a WTL project?

freehawk18-Jan-04 15:21

18-Jan-04 15:21

Hello everyone
How to load a MFC dll to a WTL project? If having some sample, could you send me by email?

Thank you .

-Freehawk

Michael Dunn18-Jan-04 16:41

18-Jan-04 16:41

If it's an MFC extension DLL, you can't. An extension DLL can only be used by an MFC app. (You could add MFC support to the WTL app, though).
If it's an MFC regular DLL, there's nothing special you have to do to use it.

--Mike--
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-- Rico Mariani, CLR perf guy

freehawk18-Jan-04 16:53

18-Jan-04 16:53

Hello.

Could you teach me the details about "add MFC support to the WTL app"?
Thank you.

-Freehawk

Michael Dunn18-Jan-04 16:58

18-Jan-04 16:58

It'd be easier if you made a dummy ATL project with the appwizard, and check the "support MFC" checkbox so you can see where the CWinApp object is created & initialized.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0.1! | RightClick-Encrypt
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freehawk18-Jan-04 17:18

18-Jan-04 17:18

Hello
Thank you for the reply.
Now I am using WTL7.1, and I cannot find "check the "support MFC" checkbox ".
how to do?

-Freehawk

Michael Dunn18-Jan-04 19:38

18-Jan-04 19:38

It's in the ATL appwizard, not the WTL one.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0.1! | RightClick-Encrypt
"Just because the box has 2 gigabytes of memory doesn't mean you get to use it all!"
-- Rico Mariani, CLR perf guy

freehawk18-Jan-04 19:48

18-Jan-04 19:48

Hello.

Thank you very much. I want to know a way by which I can use MFC in a WTL project.
If know it, please tell me.

-Freehawk.

Jörgen Sigvardsson19-Jan-04 12:10

Jörgen Sigvardsson

19-Jan-04 12:10

You have to ask yourself this question; If I need MFC support, then why am I not writing an MFC based application?

--
Seraphim Shock. Gold for your ears.

freehawk19-Jan-04 13:34