Re: list of VARIANT - ATL / WTL / STL Discussion Boards

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

Paul M Watt13-Dec-02 5:20

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

Re: STL Tree ?

Paul M Watt13-Dec-02 5:26

Paul M Watt

13-Dec-02 5:26

Look up Red-Black tree on Google, that is what STL uses for its internal tree mechanism.

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: STL Tree ?

Jörgen Sigvardsson14-Dec-02 10:57

Jörgen Sigvardsson

14-Dec-02 10:57

Do you need a specialized tree such a binary search tree or a general n-tree?

A general n-tree can be hacked up as:

template <typename T>
struct Node {
    T data;
    Node* parent; // Optional member, can make navigation easier
    std::list<Node*> children;
};
 
// Then you can write simple functions like: 
template <typename T>
Tree_AppendChild(Node<T>* node, const T& value) {
   ...
}
 
template <typename T>
Tree_InsertChild(Node<T>* node, const T& value, int pos) {
   ...
}
// etc...

And then you could of course wrap all this into a single class if you want a more object-oriented approach.

N.B. you need to interpret (Node*)NULL as the base case - an empty tree.

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

How do I raise events.

acosmin11-Dec-02 3:15

acosmin

11-Dec-02 3:15

I'm completely new to ATL OMG | :OMG:

. I use VB. Mad | :mad:

I know C++ && API. I have next
questions:
1.How do I define and raise an event from a class defined inside atl. Confused | :confused:

2.How do I raise errors to the clients that use my DLL. Confused | :confused:

I'd appreciate if you give me some MSDN refferences or even articles inside CodeProject.
- Any suggestions how to make subclassing for a window through the pass of hWnd parameter inside an ATL DLL? (I have some ideas that worked well under vb using API functions but I really appreciate the experience of the coders that visit this site, so I expect your opinion.)
- I want to use ATL to build an DLL that takes as parameter the hWnd and subclass certain messages secified through an AttachMessage method. When the message is received I want to raise an event WndProc(...) into the caller. Confused | :confused:

Thanx to all of you. Rose | [Rose]

I have a lot to learn from you.

Cosmin Amza

Re: How do I raise events.

xi90412-Dec-02 2:07

xi904

12-Dec-02 2:07

Answer
Q1.http://msdn.microsoft.com/library/en-ccore/html/vcconATLEventHandling.asp
Q2.AtlReportError() or CComCoClass::Error()

SetSite

suresh_sathya11-Dec-02 1:09

suresh_sathya

11-Dec-02 1:09

When i select the object as internetexplorerobject,i would like to call the setsite function onstartup.

How should i call that function.

How to use m_spClientSite

hdi99kf@syd.kth.se6-Dec-02 2:42

hdi99kf@syd.kth.se

6-Dec-02 2:42

Hello.

I have an ActiveX control which I run in Internet Explorer. I want to be able to do some

changes it the html when the control is closed.

I have seen a code example on MSDN:

// Get the document.<br />
CComPtr<IOleContainer> spContainer; <br />
m_spClientSite->GetContainer(&spContainer); <br />
CComQIPtr<IHTMLDocument2, &IID_IHTMLDocument2> spDoc(spContainer); <br />
if (spDoc)<br />
    spDoc->put_bgColor(CComBSTR(_T("pink")));

My problem is I don't know how to obtain the member variable m_spClientSite. Do I have to

implement an interface to use this variable? I tried to include <atlctl.h> but that gave me

a lot of errors.

Any help is greatly appriciated.

Thanks in advance.

/Charlie.

Re: How to use m_spClientSite

geo_m6-Dec-02 5:25

geo_m

6-Dec-02 5:25

Hmm, I though I answered this already Smile | :)

m_spClientSite is a member of CComControlBase and as you placed this to ATL forum, I expect, you did that in ATL, so only thing you have to do in your ATL component, which is derived from the CCCBase, is to enjoy using the member Wink | ;)

Re: How to use m_spClientSite

Anonymous6-Dec-02 6:57

Anonymous

6-Dec-02 6:57

Hello.

I have an ATL-object in my project, I guess that's not enough then...

Thanks anyway.

Re: How to use m_spClientSite

geo_m6-Dec-02 8:39

geo_m

6-Dec-02 8:39

Then if your object is derived from IOleObjectImpl, you have the GetClientSite() possibility (see IOleObjectImpl::GetClientSite() in ATL Library Reference

STL Q : find_if = poop. any better?

C^hris L^osinger5-Dec-02 15:50

C^hris L^osinger

5-Dec-02 15:50

find_if is no better than running down the collection yourself, comparing items.

is there anything that will do a binary search (with a predicate) on a sorted vector?

please don't say "binary_search" because that is a totally useless P.O.S. that only tells you if an item exists in the collection (it returns bool)- it doesn't actually give you the item. "Q: can you tell me what time it is? A: yes".

-c

There's one easy way to prove the effectiveness of 'letting the market decide' when it comes to environmental protection. It's spelt 'S-U-V'.
--Holgate, from Plastic

Smaller Animals Software

Re: STL Q : find_if = poop. any better?

Taka Muraoka5-Dec-02 16:07

Taka Muraoka

5-Dec-02 16:07

You might be able to use lower_bound() or equal_range()?

I'd wear a miniskirt and pimp myself for an extra ten grand a year. - David Wulff

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