Re: WTL Community - ATL / WTL / STL Discussion Boards

Mehdi Mousavi14-Dec-02 3:48

14-Dec-02 3:48

Dear folks,

Consider 2 components, COuter that implements IOuter and CInner that implements IInner. OTOH, CInner is *auto aggregated* within COuter. By auto aggregation I mean it's aggregated within the COuter class using COM_INTERFACE_ENTRY_AUTOAGGREGATE ATL's macro.

Moreover, I've got some regular member methods on CInner, say, SetId, SetOrigin, and the like. These method *are not* on my IInner interface, they are placed as member functions of the class (as mentioned above). The IInner contains "Get" accessors, say, GetId, GetOrigin and the like so that the user could *only* obtain some information using the IInner interface. She cannot set anything on the object, since there's no "Set" accessors on IInner.

Now, I'm going to use the objects mentioned above, so that I can call those Set accessors within the program and the user could successfully get these values using the Get methods on IInner. I tried the following:

IOuterPtr spOuter;
HRESULT hRes = COuter::_CreatorClass::CreateInstance(NULL, IID_IOuter, (void **)&spOuter);
if(FAILED(hRes))
return FALSE;

CComAggObject<cinner> *pInner;
hRes = CComAggObject<cinner>::CreateInstance(spOuter, &pInner);
if(FAILED(hRes))
return FALSE;

pInner->m_contained.SetId(24950);

IInnerPtr spInner;
hRes = pInner->QueryInterface(IID_IInner, (void **)&spInner);
if(FAILED(hRes))
return FALSE;

But this is basically wrong, since the Inner object is *auto aggregated* ! Do you have any idea how I can create such things? Something like ITCallInfoChangeEvent that gives the user some informaiton via it's Get accessors, (get_Call and get_Cause to name a few) and user cannot set anything on this object, since it's got no Set accessor.

Any help would be highly appreciated,

Cheers

Mehdi Mousavi

Re: Regular methods on the class object

AlexO19-Dec-02 4:25

AlexO

19-Dec-02 4:25

How about plain old approach of simple object with two interfaces?

Re: Regular methods on the class object

Mehdi Mousavi19-Dec-02 6:27

Mehdi Mousavi

19-Dec-02 6:27

Well, I finally ended up in having 2 different interface on my inner object, one for initialization and the other one for Get accessors.

Cheers,

Mehdi Mousavi

ATL 7.0 Creating Clients for COM Components

jparsons13-Dec-02 14:56

jparsons

13-Dec-02 14:56

I'm at the edge right now. I've spent all afternoon trying to create a client for the simplest of COM components.

I started an ATL project library. I added a class Calculator with the interface ICalculator.

Now I just want to make a trivial client that calls the Add method. I can't get anything to work. I try to include "../Calculator.h" into the Client code but I get errors with DECLARE_PROTECT_FINAL_CONSTRUCT. Including _Utils.tlb isn't helping at all.

Can anyone point me to where I can find a simple tutorial for creating clients for ATL 7.0 com objects?

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Re: ATL 7.0 Creating Clients for COM Components

Jörgen Sigvardsson16-Dec-02 10:44

Jörgen Sigvardsson

16-Dec-02 10:44

You're including the wrong file I'm afraid.

If your COM-dll projects is named XYZ, include the autogenerated XYZ.h. Also make sure you include XYZ_i.c somewhere, perhaps stdafx.cpp? It contains the GUIDs related to your interfaces and classes.

Either that or #import "XYZ.dll"

--
Only in a world this sh*tty could you even try to say these were innocent people and keep a straight face.

Child Dialog and the XP visual styles

Chad Busche13-Dec-02 11:32

Chad Busche

13-Dec-02 11:32

In a tabbed property page I found out MS uses a gradiant to fill the the client area when using the XP visual styles & new common control library. On one of my property pages I have a child dialog derived from CAxDialogImpl<myclass>. Since this child control is at the bottom of property page I get a big white rectangle where my child dialog is.... it just looks bad.

The only solution i can come up with is move the controls on the child dialog into the property page. Anybody have any ideas, thanks in advance.

WTL Community

Michael P Butler13-Dec-02 2:07

Michael P Butler

13-Dec-02 2:07

Where do all the WTL programmers hang out, is it just the Yahoo WTL mailing list. I'm trying to improve my WTL skills and I'm looking for good code examples and components besides the ones here at CP.

A Google search tends just to point me at the mailing list or at CodeProject and a few foreign language pages. Any suggestions on where I need to be hanging out.

Michael

Fat bottomed girls
You make the rockin' world go round -- Queen

Re: WTL Community

Paul Selormey13-Dec-02 2:24

Paul Selormey

13-Dec-02 2:24

I do not think you need special codes besides the ones here. All the MFC codes (at least most) translate into WTL easily, so just pick the basis and you will be fine.

Start some project yourself and you will have enough to learn. I just started my WTL project and is it a good learning process.

Best regards,
Paul.

Jesus Christ is LOVE! Please tell somebody.

Re: WTL Community

Ramon Casellas13-Dec-02 2:54

Ramon Casellas

13-Dec-02 2:54

You may know this one, but just in case

Bjarke Viksoe Home Page, see the URL:

viksoe.dk

ATL/WTL section.

Bjarke has been very nice publishing his work. Although there is not a lot of documentation, I've learnt a lot from his sources.

Best Regards,

Ramon

Re: WTL Community

AlexO19-Dec-02 5:08

AlexO

19-Dec-02 5:08

What is it we are not good enough for you? Big Grin | :-D

Using CComPtr<IHTMLDocument2Ptr>? (first time in ATL...)

Joan M13-Dec-02 0:10

Joan M

13-Dec-02 0:10

Hello,

INTRODUCTION
Using VC++6 sp5
MS W2k sp3

I'm using CHtmlView in order to show web pages (that are modified from my dialog based VC++ program) to the user.
In order to be able to do that I'm using Paul Di Lascia's HTMLCtrl and since today this code:

pIDispatchPtr.QueryInterface(pHTMLDocPtr);

if (lpDispatch)
{
    hr = lpDispatch->QueryInterface(IID_IHTMLDocument2, (LPVOID*)&pHTMLDocument2);
    lpDispatch->Release();

    hr = pHTMLDocument2->get_body(&pBody);
    pHTMLDocument2->Release();

    bstr = csCodiHTML.AllocSysString();

    if (pBody)
    {
        pBody->put_innerHTML(bstr);
        pBody->Release();
    }

    SysFreeString(bstr);
}

The main problem is that for some reason the memory "allocated" is not being freed.

After posting "ho can I free this" in the VC++6 forum, somebody has told me to do it using ATL and COM smart pointers...

I've added this line to the "stdafx.h":

#include <atlbase.h>

QUESTION
I have no idea how to do this, since is my first time in ATL...

I've used this...

CComPtr<IHTMLDocument2Ptr> spHTMLDocPtr;
CComPtr<IDispatchPtr> spIDispatchPtr;
spIDispatchPtr = this->m_HTMLCtrl.GetHtmlDocument();

and I'm getting this error message (when I compile):
error C2679: binary '=' : no operator defined which takes a right-hand operand of type 'struct IDispatch *' (or there is no acceptab
le conversion)

could you tell me how to use those smart pointers in order to link them to the HTML document and to free them when finished?

SUMMARY
I need to know:
- How to link com pointers to the HTML document.
- The HTML document is intended to be taken from a CHtmlView derived class.
- How to free those pointers.

Thanks in advance.

Re: Using CComPtr? (first time in ATL...)

Paul M Watt13-Dec-02 5:20

Paul M Watt

13-Dec-02 5:20

First, click the "Display this message as-is (no HTML)" in order to make sure that all of your < and > tags appear in your code.

Next it looks like you are declaring your smart pointers like this:

CComPtr<IHTMLDocument2Ptr> spHTMLDocPtr;
CComPtr<IDispatchPtr> spIDispatchPtr;

When you declare a smart pointer with CComPtr you only need to define the type, you don't need to define it as a pointer. So change your code to this:

CComPtr<IHTMLDocument2> spHTMLDocPtr;
CComPtr<IDispatch> spIDispatchPtr;

I believe this will fix your problem.

When ever these items are assigned, Addref is automatically called on your interfaces, and when the smart pointer goes out of scope, the reference is Released. If you would like to get a hold of a pointer without AddRef or Release being called, use Attach adn Detach respectively.

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: Using CComPtr? (first time in ATL...)

Joan M13-Dec-02 5:37

Joan M

13-Dec-02 5:37

Thank you very much for your reply!

I'd solved the problem doing what you've suggested...

But I'm still having one problem:

CComQIPtr<IHTMLDocument2> spHTMLDocument = this->m_HTMLCtrl.GetHtmlDocument();
if(spHTMLDocument)
{
    CComQIPtr<IHTMLElement> spHTML;

    spHTMLDocument->get_body(&spHTML);

    if (spHTML)
    {
        bstr = csCodiHTML.AllocSysString();

        spHTML->put_innerHTML(bstr);

        spHTML.Release();
    }
    else
    {
        //spHTMLDocument->write(); <code>what I'm trying now...</code>
        //bstr = csCodiHTML.AllocSysString();
        //spHTMLDocument->createElement(bstr,&spHTML); <code>THIS DON'T MAKES ANYTHING...</code>
    }

OK, as you can see In the else clause I'm trying to write the HTML directly to the document. This is interesting for me because for some reason the first time that I try to get access to the document it's a null pointer... (all the other times it works fine).

Moreover if I can do it I'll avoid the usage of the second pointer making the code easier...

The only problem (I expect) is that I need to use a SAFEARRAY type in order to write directly to the document pointer and I don't know how to do it...

I've searched into the MSDN but there are not examples...

Thank you for your help!

Re: Using CComPtr? (first time in ATL...)

AlexO19-Dec-02 3:23

AlexO

19-Dec-02 3:23

Here is a sample; error handling is omitted (but required):

HRESULT hr = S_OK;
SAFEARRAY * pArray = ::SafeArrayCreateVector(VT_VARIANT, 0, 1);
if (pArray)
{
VARIANT* pElement = 0;
hr = ::SafeArrayAccessData(pArray,(LPVOID*) &pElement);
pElement->vt = VT_BSTR;
pElement->bstrVal = _bstr_t(L"Hello world.").copy();
hr = ::SafeArrayUnaccessData(pArray);
hr = spHTMLDocument->write(pArray);
::SafeArrayDestroy(pArray);
}

Re: Using CComPtr? (first time in ATL...)

Joan M19-Dec-02 3:44

Joan M

19-Dec-02 3:44

THANK YOU! (infinite times!)

Now I'm able to load memory contents into my HTML Control directly from memory giving a great look to my app without more effort than the one required to design a web page!

Thank you again!

list of VARIANT

bojinyu12-Dec-02 2:31

bojinyu

12-Dec-02 2:31

I want do built a list of VARIANT

#include <list> typedef std::list<variant> VARIANTLIST;
VARIANTLIST varList;

and I add a VARIANT into list varList;
VARIANT pp;
pp.vt=VT_I2;
pp.iVal=1;
varList.push_back(pp);

then length of vatList is increased 1, but the comment is not right.
What is the matter? Can you help me, Thanks.

Re: list of VARIANT

Daniel Strigl12-Dec-02 2:49

Daniel Strigl

12-Dec-02 2:49

What do you mean with "then length of vatList is increased 1, but the comment is not right"?

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: list of VARIANT

bojinyu12-Dec-02 3:22

bojinyu

12-Dec-02 3:22

Sorry, I spell a word wrong.
I means then sizes of varList si increased 1, and now varList.size() return 1.
but the element VARIANT whose vt is not VT_I2.

Re: list of VARIANT

Daniel Strigl12-Dec-02 4:30

Daniel Strigl

12-Dec-02 4:30

Sorry, but I think I don't understand OMG | :OMG:

!!!

I have tested your code:

// variant.cpp : Definiert den Einsprungpunkt für die Konsolenanwendung.
//

#include "stdafx.h"
#include <atlbase.h>
#include <list>

typedef std::list<VARIANT> VARIANTLIST;
VARIANTLIST varList;

int main(int argc, char* argv[])
{
    for (int n = 0; n < 100; n++)
    {
        VARIANT var;
        var.vt = VT_I2;
        var.iVal = 1;

        varList.push_back(var);
    }

    printf("size = %d \n", (int) varList.size());

    return 0;
}

There is all right with the code! I have a std::list of VARIANT and add 100 members of VARIANT to the list!

The varList.size() function returns the count of elements in the list and so it returns 100 and that's right!

The VT_I2 says that the VARIANT holds short members. I2 says that the member is an integer who need 2 byte of space in the memory (sizeof(short) = 2).

Take a look in the MSDN:

typedef struct tagVARIANT  {
   VARTYPE vt;
   unsigned short wReserved1;
   unsigned short wReserved2;
   unsigned short wReserved3;
   union {
      Byte                    bVal;                 // VT_UI1.
      Short                   iVal;                 // VT_I2. <===== LOOK HERE !!!
      long                    lVal;                 // VT_I4.
      float                   fltVal;               // VT_R4.
      double                  dblVal;               // VT_R8.

      ...
      ...
      ...
   };
};

Hope this helps you!

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: list of VARIANT

bojinyu12-Dec-02 18:07

bojinyu

12-Dec-02 18:07

Thanks Daniel S.
I have remove the problem. All the code really run in the right way, the fault was my wrong checking. I check by the watch window of Visual Stdio.
The results of the list element showed there are upset.

Thanks again.

Re: list of VARIANT

bojinyu12-Dec-02 3:22

bojinyu

12-Dec-02 3:22

Sorry, I spell a word wrong.
I means then sizes of varList si increased 1, and now varList.size() return 1.
but the element VARIANT whose vt is not VT_I2.

STL Tree ?

Nick Parker11-Dec-02 7:28

Nick Parker

11-Dec-02 7:28

Does the STL support a tree as it does with other data structures like the linked-list and vector, or do I need to write my own implementation?

Nick Parker

Not everything that can be counted counts, and not everything that counts can be counted. - Albert Einstein

Re: STL Tree ?

Neville Franks11-Dec-02 9:25

Neville Franks

11-Dec-02 9:25

Nick Parker wrote:
Does the STL support a tree as it does with other data structures like the linked-list and vector, or do I need to write my own implementation?

It depends on what you mean be a tree. I think you'll find that map and set use trees, but these probably are the sort of trees you want.

There are a few articles here on CP:
Tree data class for C++ http://www.codeproject.com/cpp/treedata_class.asp[^]
C++ AVL Tree Template. http://www.codeproject.com/cpp/avl_tree.asp[^]
An STL like Tree Class. http://www.codeproject.com/vcpp/stl/wrk.asp[^]

I think I've got a few more references around if this isn't enough. I'm big into trees. Wink | ;)

Hope that's of some help.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

Re: STL Tree ?

Nick Parker11-Dec-02 9:37

Nick Parker

11-Dec-02 9:37

Neville Franks wrote:
Hope that's of some help.

Thanks for the feedback Neville, I am looking for something that will compile under Unix with GCC. I was hoping (thinking it doesn't exist now) that I could do something like:

tree<int> m_tree;
m_tree.AddNode(1);
m_tree.AddNode(2);
m_tree.AddNode(3);

or at least something like it. Guess I was hoping I wasn't going to have to write a whole bunch of code here as it is due on Friday Eek! | :eek:

(last project for my data structures class). I have already started the implementation last night and I can get it done, I was just looking for a quicker method. Thanks again for the extra info.

Nick Parker

Not everything that can be counted counts, and not everything that counts can be counted. - Albert Einstein

Re: STL Tree ?

Todd Smith12-Dec-02 11:36

Todd Smith

12-Dec-02 11:36

boost.org has a tree class I beleive.

Todd Smith

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