Re: Connection points - ATL / WTL / STL Discussion Boards

Martin Walker10-Mar-04 3:19

10-Mar-04 3:19

I have created a simple mfc activex control which works in the activex control test container.
Now I have have created an stl program and use #import to pull in definitions of the control and a wrapper class.

Next I have a function:

HRESULT hr;
_DMysearch *pSearch;

const IID IID_DMysearch = { 0x2887adc2, 0xeba1, 0x4ca9, { 0xb3, 0x58, 0x15, 0xae, 0xf, 0xd2, 0xb9, 0x6a } };

const CLSID CLSID_mysearch = {0x4ae8deda, 0xee97, 0x47ee,{ 0x9c, 0xcc, 0xd, 0x1b, 0x4b, 0x99, 0x6b, 0x88}};

::CoInitialize(NULL);

hr = CoCreateInstance (CLSID_mysearch, // CLSID of coclass
NULL, // not used - aggregation
CLSCTX_INPROC_SERVER, // type of server
IID_Dmysearch, // IID of interface
(void**) &pSearch ); // Pointer to our interface pointer

if ( SUCCEEDED ( hr ) )
{
long res = pSearch->test();

}
else
{
// Couldn't create the COM object. hr holds the error code.
}

I get as far as pSearch->test() which is a simple long function with no parameters and I get an exception from com_dispatch_method.

any ideas?

jema

Service problem.

Prakash Nadar9-Mar-04 17:18

Prakash Nadar

9-Mar-04 17:18

I have created a ATL exe service and added a interface to it....
I registered it and run it.
But for somereason sometimes the atl service starts automatically on its own making multiple copies in the memory..
can any one explain why it happens ?
here is createservice that is called, i belive something is in here but not able to figure it out.

SC_HANDLE hService = ::CreateService(
hSCM, m_szServiceName, m_szServiceName,
SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS,
SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL,
szFilePath, NULL, NULL, _T("RPCSS\0"), NULL, NULL);

Thanx in advance.

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How to implement a MFC CFormView in WTL?

Aizz9-Mar-04 14:59

Aizz

9-Mar-04 14:59

The MFC CFormView is a view but using a dialog resource for UI, which makes modifying the UI layout very easy, I think this class is great(at least for me). But when shifted to WTL, I cannot find a class(or I missed?) like the CFormView. So anyone got a clue or has implemented such a class would mind to share with me?

I'm new in WTL(even in ), and I've searched this forum with keyword "FormView"/"Form View" but just got "no results". Cry | :((

So if you think my question is stupid, please forgive me. ^_&

Thanks for any reply.

=================
Sorry for my poor English.

Re: How to implement a MFC CFormView in WTL?

_Magnus_9-Mar-04 21:43

_Magnus_

9-Mar-04 21:43

You can create a app with a form view with the WTL appwizard but there is no FormView class, the view uses CDialogImpl

/Magnus

- I don't necessarily agree with everything I say

Re: How to implement a MFC CFormView in WTL?

Aizz10-Mar-04 16:05

Aizz

10-Mar-04 16:05

Thanks for your reply， I'll try it later.
Thank you.

How can I add a tab control on a ATL Property Page?

larsibam9-Mar-04 4:36

larsibam

9-Mar-04 4:36

I've created a Connection Page (in the Data Source Object of my OLE DB Provider) to be displayed by the Data Link core component.
Now I'm trying to add a tab control on the page using CreateWindow with the WC_TABCONTROL class (being registered through InitCommonControlsEx(...).
But I can't get the Instance Handle needed by CreateWindow,
because
hInst = (HINSTANCE)::GetWindowLong(hwndParent, GWL_HINSTANCE);

always returns 0x0000000.
(I've received the hwndParent through the IPropertyPage::Activate Method, that's being called by the Data Link core component)

How can I get that Instance Handle? Or is there another way of using a tab control on my property page?

Connection points

Member 169778-Mar-04 3:14

Member 16977

8-Mar-04 3:14

Hi All,

I have a COM component which supports outgoing interface IDataCallback,which calls OnDataChange event.
When client Get Connectionpoints and Call Advise for Server,i want to fire OnDataChange.Where should i Know that Client has called Advise so that i should send him OnDataChange callback,just to show that callback is working.

In normal working i am sending OnDataChange whenever data Changes in my server,but i want to send this first OnDataChange as soon as Client call Advise.
Where should i write the code for this?

Code for my server is like this:

class MyServer;
typedef IConnectionPointImpl <myserver,&iid_idatacallback,ccomdynamicunkarray> DataCallback;

class ATL_NO_VTABLE MyServer :
public IInterface1,
public IInterface2,
public IConnectionPointContainerImpl<myserver>,
public DataCallback,
public CComObjectRootEx<ccommultithreadmodel>
{
---
}

Thanks in advance
Tushar.

Re: Connection points

Steve S8-Mar-04 4:29

Steve S

8-Mar-04 4:29

Because you're deriving from IConnectionPointContainerImpl, then it's doing all the hard work for you.
You might be able to provide your own implementation of Advise, but you'd need to make sure you called the templated implementation first, then fired the event (if successful). Don't know whether (a) this is possible or (b) it's allowed, since you're effectively firing an event before Advise has completed, so I don't know if there's COM runtime magic involved.

Steve S

Atl Composite Control don´t draw

Luis Ricardo8-Mar-04 0:56

Luis Ricardo

8-Mar-04 0:56

Hi, i need an ADDin for Word 2000 ( XP and 2003 too) that has an dialog box
like a ATL Composite Control ( VC 7.1).

The problem is when this control is inserted in the Word (insert object) and lost focus,the dialog disapear (seems like the WM_PAINT don´t be triggered).

The control draws it self only when i "double click" the control.
I read some articles that this behavior is because the Word Container
don´t give us an Window to draw when the control is without the focus.

In VB, the control don´t disapear only in the Word.

Can anyone help me ?

thanks

How to save web page to jpeg

AWebDude4-Mar-04 10:21

AWebDude

4-Mar-04 10:21

Is there a way to save the web page contents to an image. Just the contents, no toolbar, no status bar. In other words print web page to image file??

Thanks a lot.

How to have access to the members of a class

Roozbeh694-Mar-04 9:51

Roozbeh69

4-Mar-04 9:51

Hi everybody

I have written an ATL 3.0 project including two sample classes named CAttachment & CAttachments. These classes have interfaces IAttachment & IAttachments in order. IAttachments has got a method named "Item" that returns a result of the type of IAttachment. But before returning the IAttachment, I want to call some member functions of the CAttachment class to setup the IAttachment properly. I know how to create the IAttachment interface, but I don't know how to have access to the members of the CAttachment from the "Item" method. I will be thankful if anybody replies to me.

Regards,
Roozbeh.

Re: How to have access to the members of a class

Prakash Nadar5-Mar-04 22:11

Prakash Nadar

5-Mar-04 22:11

CAttachement *pAttach;
IAttachment pIAttach;
pAttach = (CAttachement*) pIAttach;

pAttach can now call the class members of the its class.

This space is empty.

Re: How to have access to the members of a class

Jörgen Sigvardsson5-Mar-04 23:11

Jörgen Sigvardsson

5-Mar-04 23:11

*bzzt* Wrong way. This should never ever be done. You can never be certain what pIAttach points to. Any COM book will tell you this at least a dussin times. Smile | :)

A better way to gain access to members of CAttachment is to use CComObject<CAttachement> instead. CComObject<CAttachement>* pObj; HRESULT hr = CComObject<CAttachement>::CreateInstance(&pObj); pObj->AddRef(); // CComObject<CAttachement>::CreateInstance does not addref! pObj->member = value; pObj->InterfaceMethod(); IAttachment* pAtt = pObj; // can safely be passed along as interface pointer to other apartments, etc -- Unser Tanz ist so wild! Ein neuer böser Tanz. Alle gegen Alle!

Re: How to have access to the members of a class

Prakash Nadar12-Mar-04 23:04

Prakash Nadar

12-Mar-04 23:04

yeah correct. D'Oh! | :doh:

Code Review Correction.

if(pObList == NULL)
{
   pObList = NULL;
   delete pObList;
}

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Re: How to have access to the members of a class

Steve S14-Mar-04 22:02

Steve S

14-Mar-04 22:02

Surely not.

if (pObList != NULL)
{
delete pObList;
pObList = NULL;
}

unless, of course, you've worked where I'm working at the moment, where apparently that would be an acceptable style of coding. Frown | :(

Steve S

Re: How to have access to the members of a class

Prakash Nadar14-Mar-04 22:29

Prakash Nadar

14-Mar-04 22:29

Steve S wrote:
Surely not.

sure i aggree with you, it was the code review correction that i gave to my coworker (its a mistake that i asked him to correct it)

but for some reason, that piece code works perfectly, coz deleteing null pointer is ignored. Smile | :)

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Re: How to have access to the members of a class

Steve S15-Mar-04 0:32

Steve S

15-Mar-04 0:32

Indeed

However, unless somewhere there is a corresponding delete for non-null pointers, I suspect you might have at the very least some diagnostics about leaks when running under the debugger.

Steve S

Re: How to have access to the members of a class

Prakash Nadar15-Mar-04 0:52

Prakash Nadar

15-Mar-04 0:52

Steve S wrote:
unless somewhere there is a corresponding delete for non-null pointers

no this is was the only delete for that object in the dtor. Yes there was a memory leak in this case and other places.

I just placed it in my sig to show that how stupid anyone can get to write that kinda of code.
But then i removed it coz i thought it was not rite to make a joke of others programming pratice.

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Resize ATL control in IE

benglish723-Mar-04 14:23

benglish72

3-Mar-04 14:23

Hi, I've an ATL activeX control that is a dialog with some windows. When it's hosted in IE there are resizing problems (it has resizing border) when IE isn't maximized. The dialog will not draw outside its original size, even though the border seems to drag out to a much larger size (the controls and dialog size, but are clipped to the original width and height). This doesn't happen when IE is maximized, as the dialog and controls are drawn to new sizes/positions.
I've no idea of the cause, is it a bug in IE or just a special case I need to account for in the code?
Thanks in advance.
Brian.

clicking on IE

Monty²3-Mar-04 2:41

Monty²

3-Mar-04 2:41

in a BHO, if the user clicks on any word how can i know which word user clicked on

there is a function elementFromPoint but that will give the whole Element i want the specific text

how does IE know that the stuff under the mouse is Text cause the mouse pointer changes to a carat when the mouse moves over text on a HTML page

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Re: clicking on IE

Prakash Nadar4-Mar-04 6:21

Prakash Nadar

4-Mar-04 6:21

mailMonty wrote:
how does IE know that the stuff under the mouse is Text

IE..err God knows everything.

Solution

Monty²5-Mar-04 0:01

Monty²

5-Mar-04 0:01

In OnClick Event Write this :

CComPtr<IHTMLTxtRange> spHTMLTxtRange;
m_pHTMLBody->createTextRange(&spHTMLTxtRange);

spHTMLTxtRange->collapse(VARIANT_TRUE);
long x,y;
pEvent->get_clientX(&x);
pEvent->get_clientY(&y);

spHTMLTxtRange->moveToPoint(x,y);
spHTMLTxtRange->expand(CComBSTR("word"),&vtBool);

spHTMLTxtRange->get_text(&bstrText);

//bstrText now contains the Word which user clicked

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Re: Solution

Prakash Nadar5-Mar-04 22:07

Prakash Nadar

5-Mar-04 22:07

Nice!!!
good to see that you posted the solution when you got it, ppl usally forget about it.

This space is empty.

COmposite Control

hongzter2-Mar-04 22:16

hongzter

2-Mar-04 22:16

i have an full control ImageControl.
i have a composite control imageDisplay.
i want to put imagecontrol into imagedisplay. that's fine.
but when i want to invoke a method in imageControl, i can't. not even to compile. i am using code i found in txts and websites:

CComPtr<iimagecontrol> pImg;
GetDlgControl(IDC_IMAGECONTROL, IID_IImageControl, reinterpret_cast<void**> (&pImg));

error: IImageControl unknown identifier.

must i import something? when i inserted the ImageControl, a h.file and cpp.file is added to the project. but neither defines the interface of imagecontrol.

must both source codes be in the same project to work?

help....

SysTreeView32 and WTL

The Arabundi2-Mar-04 7:01

The Arabundi

2-Mar-04 7:01

Hello,

I’m looking for a way to display the SysTreeView32 control in a WTL application. Is there an easy way to do this or is there a custom WTL control that can be used? Should I resign to my fate and implementing my own?

If I have to implement my own, what are your recommendations? IShellFolder interface?

Thanks in advance,
-mass

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