Hello. - COM Discussion Boards

hishhash2-Dec-06 0:16

2-Dec-06 0:16

i am a final year student in b.tech(computer science)..i would like to get some interesting topics in .net & c# so that i could carry it on as my main project(which is a part that is compulsory in our syllabus)..

dasdsd

WMI Win32_pingStatus

abhiramsss1-Dec-06 7:13

abhiramsss

1-Dec-06 7:13

how to ping remote system running on Windows 2000 using WMI
is there any patch for windows 2000 to ping remote system using win32_pingstatus class
thanks

abhi

Changing the size of ToolBand Dynamically

georgekjolly1-Dec-06 0:59

georgekjolly

1-Dec-06 0:59

Hai All,

I have made an InternetExplorer toolband .

In that I can fix the size of toolband in GetBandInfo() function

using the structure DESKBANDINFO .

But I need to change the size of my toolband in a function other than

GetBandInfo(), is it possible.

Thanks
George

How to take X , Y Coordinates of HTML Element Collections

georgekjolly30-Nov-06 22:13

georgekjolly

30-Nov-06 22:13

Hai all,

I am doing a Programme in COM. That will retrieve the x,y Position of all the

HTML Element Collections ,

I have done upto getting HTML Element Collections using IHTMLElementCollection

Interface.

That means I have a pointer of IHTMLElementCollection that contains all the

HTML Element Collections .

But now How I can take X and Y positions of these elements. Or is there any

other way of taking these things.

Please Help me.
Thanks in Advance
George

How do I use a third party Windows Forms control (VB.NET)

tintinchasm30-Nov-06 3:13

tintinchasm

30-Nov-06 3:13

I have failed to figure out how to use a third party control.
I downloaded this

http://www.codeproject.com/cs/miscctrl/CollapsibleGroupBox.asp?df=100&forumid=68831&exp=0&select=1648587#xx1648587xx

Added the DLL as a reference.

I cant see the control on the tool box.

Forgive me, I'm totally new

Activex GUI project

jfuhrer30-Nov-06 2:09

jfuhrer

30-Nov-06 2:09

Hi I am a newbie with COM & ActiveX and would like to ask for some advice.

I'm developing a GUI for real time systems, written in ANSI C and C++, it will provide drawing functions, a windowing system, widgets, bitmaps etc.

I want to add a possibility to use it aswell as an ActiveX control, so people can create a VisualC++ project and develop on it as a way of simulating the real hardware. So the ActiveX control should display what at the end will be seen in a real screen running the GUI in an embedded real time system.

Any hints on the best way to do this? I am just starting my research on ActiveX possibilities. My first thought is to use an ActiveX dialog with a picture control on it the size of the real screen. Then make it get the picture content from a memory area provided by the container application. When the container changes that memory, changes should be displayed in the ActiveX picture. Should the picture control be a bitmap or a "owner draw" type? Any help will be much appreciated.
Thanx!!

Re: Activex GUI project

lafleon4-Dec-06 12:44

lafleon

4-Dec-06 12:44

Hello,

Just try to create ATL Project and add ATL Full Control. Please reed ATL Tutorial on MSDN for more details.

Regards

Hello.

planC29-Nov-06 14:09

planC

29-Nov-06 14:09

Hi~

I am programming a customized web browser with IWebBrowser2 in windows ce 5.0
And I want to embody some functions which copy/cut/paste.

I made it in Win32 Application already..
Using by these ways

Way1
HRESULT hr = m_pWeb->ExecWB(
OLECMDID_COPY, OLECMDEXECOPT_DODEFAULT, NULL, NULL);
if (FAILED(hr))
{
int n = GetLastError();
ASSERT(false);
}

Way2
IHTMLDocument2 *pHtmlDoc;
hr = pDispatch->QueryInterface<ihtmldocument2>(&pHtmlDoc);
EHResult::CheckException(
L"CMainFrame.Copy.QueryInterface<ihtmldocument2> Fail (0x%08x)", hr);

IHTMLSelectionObject *pHtmlObj;
hr = pHtmlDoc->get_selection(&pHtmlObj);
EHResult::CheckException(L"CMainFrame.Copy.get_selection Fail (0x%08x)", hr);
{
IDispatch *pRange;
hr = pHtmlObj->createRange(&pRange);
EHResult::CheckException(L"CMainFrame.Copy.createRange Fail (0x%08x)", hr);

IHTMLTxtRange *pText;
hr = pRange->QueryInterface<ihtmltxtrange>(&pText);
EHResult::CheckException(
L"CMainFrame.Copy.QueryInterface<ihtmltxtrange> Fail (0x%08x)", hr);

VARIANT null;
VariantInit(&null);

VARIANT_BOOL isOk;
hr = pText->execCommand(L"Copy", VARIANT_FALSE, null, &isOk);
EHResult::CheckException(L"CMainFrame.Copy.execCommand Fail (0x%08x)", hr);
}

But It doesn't work in windows ce 5.0 -0-
What should I do now~

And I have one more trouble.
I have to control the element's focus (in html document like ANCHORs or
CONTROLs) by arrow key.
Is there a way get the current focus of elements??

It also possible to get in Win32 by pHtmlDoc->get_activeElement
But Win CE 5.0 -0-

Please Help me~
Thank you.

COM Wrapper

sheetal_0628-Nov-06 23:07

sheetal_06

28-Nov-06 23:07

I have a .lib generated in VC6. How can i create a COM wrapper for this lib( with some related .h files), which can be used within a VC8 application. Since i am not much aware of COM wrapper,please help me with some details....

Re: COM Wrapper

User 21559729-Nov-06 4:53

User 215597

29-Nov-06 4:53

If you want to access the exported methods from Managed C++ then I beleive you may want to look at Interoperability topic in .NET.

Following may be helpful, if you require a COM wrapper over existing DLL -
1. Create a new ATL COM DLL project
2. Add a simple ATL object
3. Add methods [and properties, if required] to the interface of this object. These methods [and properties] correspond to the methods in your DLL. You have the declaration in the .H file already
4. Implement these methods [and properties]. Usually you will only call the exported function of your DLL from each method.

Let me know if this helps. Anyone who knows more specific or can correct me, please do.

S o h a i l K a d i w a l a

To Err Is Human; to Debug, Divine

modified 21-Apr-21 21:01pm.

Re: COM Wrapper

sheetal_0629-Nov-06 17:58

sheetal_06

29-Nov-06 17:58

Thanks...

ActiveX Control

HakunaMatada27-Nov-06 17:04

HakunaMatada

27-Nov-06 17:04

How would I distinguish between a normal COM component and an ActiveX control by looking at the code?

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

It’s rather simple to write an unmanaged C++ application that crashes when it performs a callback. It’s impossible to write a managed application that does the same, thanks to delegates. - Jeff Prosise

Re: ActiveX Control

Roger Stoltz27-Nov-06 20:55

Roger Stoltz

27-Nov-06 20:55

From MDSN:

At a higher level, an ActiveX control is a COM object that implements several main ActiveX technologies, including regular incoming COM interfaces, the OLE embedding protocol, connection points, and property pages. At a lower programmatic level, ActiveX controls are just COM classes implementing certain families of interfaces. When some client code successfully queries for one of these interfaces, the client code then knows it's dealing with an ActiveX control.
The interfaces exposed by an ActiveX control fall into three general categories. First, ActiveX controls are embeddable objects; that is, they implement most of the OLE Document in-place activation and embedding protocols. ActiveX controls implement the following interfaces: IOleObject, IPersistStorage, IDataObject, IOleInPlaceActiveObject, IOleInPlaceObject, IViewObject2, and IRunnableObject (this is rarely used). Second, ActiveX controls usually support property pages so the client has a means of modifying the control's properties. Finally, ActiveX controls usually implement outgoing interfaces that the client can find out about using COM's connection point technology.

So basically you can determine if it's an ActiveX control by what interfaces it's exposing and whether it has a property page or not.

I got the text from this article[^].

--
Roger

"It's supposed to be hard, otherwise anybody could do it!" - selfquote

"No one remembers a coward!" - Jan Elfström 1998
"...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above

Re: ActiveX Control

HakunaMatada27-Nov-06 21:29

HakunaMatada

27-Nov-06 21:29

Thanks a mil.... Dunno why I didn't look up MSDN. D'Oh! | :doh:

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

Re: ActiveX Control

Roger Stoltz27-Nov-06 21:49

Roger Stoltz

27-Nov-06 21:49

HakunaMatada wrote:
Dunno why I didn't look up MSDN

Nah, you've got to know what to look for as well.
I knew you can tell from the interfaces, but couldn't remember them, and I wanted some writings to refer to.

No worries, mate!

WMI

abhiramsss27-Nov-06 9:38

abhiramsss

27-Nov-06 9:38

Can i know how to ping remote systems on windows 2000 professional operating system using WMI can u please provide example in C++.

i have the following script example

strComputer = "PC1;PC2;"
sArray = Split(strComputer, ";")
strDomain = "WOrkArea"
strUser = InputBox("Enter user name")
strPassword = InputBox("Enter password")
Set objSWbemLocator = CreateObject("WbemScripting.SWbemLocator")
For each Machine in sArray=
Set objWMIService = objSWbemLocator.ConnectServer(strComputer, _
"root\CIMV2", _
strUser, _
strPassword, _
"MS_409", _
"ntlmdomain:" + strDomain)
Set colProcessList = objWMIService.ExecQuery _
("SELECT * FROM Win32_Process WHERE Name = 'notepad.exe'")
For Each objProcess in colProcessList
objProcess.Terminate()
Next
Next

can u please help with c++ code using WMI to run on Windows 2000 professional

Thanks in Advance

abhi

Unhandled Exception in Popup blocker code

georgekjolly25-Nov-06 3:56

georgekjolly

25-Nov-06 3:56

Hi all ,

I have just started doing COM , I have Written a Code for popup

blocker(I have given it below) .

Whenever a new popup comes the control will call Invoke Method

and goes inside "case DISPID_NEWWINDOW2" and execute

pdispparams->rgvarg[0].pvarVal->vt = VT_BOOL;
pdispparams->rgvarg[0].pvarVal->boolVal = VARIANT_TRUE;

these codes but after this an unhandled exception is coming and I am unable to

do something on it . why it is coming and is there any problem with my code.

I have given all the codes in Implementation file below . Please help me

/////////Code starts here//////////////////

CComQIPtr<iwebbrowser2, &iid_iwebbrowser2=""> m_spWebBrowser2;
CComQIPtr<iconnectionpointcontainer,
="" &iid_iconnectionpointcontainer=""> m_spCPC;

IConnectionPointContainer* connectionPointContainer;

STDMETHODIMP CMyBhoExp::SetSite(IUnknown* pUnkSite)
{

m_spWebBrowser2 = pUnkSite;

if (m_spWebBrowser2 == NULL)
return E_INVALIDARG;

// Retrieve and store the IConnectionPointerContainer pointer
m_spCPC = m_spWebBrowser2;
if (m_spCPC == NULL)
return E_POINTER;

// Retrieve and store the HWND of the browser. Plus install
// a keyboard hook for further use
//RetrieveBrowserWindow();

// Connect to the container for receiving event notifications
return Connect();
//return hr;
}

STDMETHODIMP CMyBhoExp::GetSite(REFIID riid, void **ppvSite)
{
HRESULT hr;
return hr;

}

HRESULT CMyBhoExp::Connect(void)
{
HRESULT hr;
DWORD m_dwCookie;
CComPtr<iconnectionpoint> spCP;

// Receives the connection point for WebBrowser events
hr = m_spCPC->FindConnectionPoint(DIID_DWebBrowserEvents2, &spCP);
if (FAILED(hr))
return hr;

// Pass our event handlers to the container. Each time an event occurs
// the container will invoke the functions of the IDispatch interface
// we implemented.
hr = spCP->Advise( reinterpret_cast<idispatch*>(this), &m_dwCookie);
return hr;
}

HRESULT CMyBhoExp::Invoke(DISPID dispidMember,REFIID riid, LCID lcid, WORD wFlags,DISPPARAMS * pdispparams, VARIANT * pvarResult,EXCEPINFO * pexcepinfo, UINT * puArgErr)
{
switch(dispidMember)
{
//Pop up blocker
case DISPID_NEWWINDOW2:

TRACE("Pop Up Blocked");

pdispparams->rgvarg[0].pvarVal->vt = VT_BOOL;
pdispparams->rgvarg[0].pvarVal->boolVal = VARIANT_TRUE;

break;

case DISPID_DOCUMENTCOMPLETE:
TRACE("\ncase DISPID_DOCUMENTCOMPLETE:");
break;
}
return S_OK;
}

//////////////////////Code ends here////////////////////////

Thanks
George

IE window manipulation using web browser object

georgekjolly25-Nov-06 2:22

georgekjolly

25-Nov-06 2:22

Hai All,

How can I minimize , maximize or close my Internet Explorer Main Window

by using Browser Object, that I am recieving in SetSite().

Please Help me
Thanks in Advance
George

Access Violation occur when use goForward() or goBack() method in IWebBrowser2

Lee bo24-Nov-06 3:30

Lee bo

24-Nov-06 3:30

when I use IWebBrowser2::goForward() or goBack() method in thread that begin from overrided SetSite() method, Browser Helper Object with InternetExplorer occur Error window. Mad | :mad:

"Memory Access Violation..." Dead | X|

why occur this Exception? Confused | :confused:

here is that part of code.

void SensorWorker( LPVOID lParam )
{
USHORT x,y;
int shock, count = 0, exe = 0;
ACCELREPORT data;

if(sensorFunction) {
sensorFunction(&data);
x = data.LatestZeroG_X;
y = data.LatestZeroG_Y;
}

CIESensorMove * bControl = (CIESensorMove *)lParam;

CString str;

CComBSTR bstrURL("http://www.naver.co.kr");
CComVariant vtEmpty;

while(1){
if(sensorFunction != 0){
sensorFunction(&data);
shock = (int)data.LatestAccelDataY - (int)y;
if(shock == 0 ) exe = 0;
if(bControl->m_spWebBrowser2 != NULL && exe == 0)
str.Format("%d", count);
if( shock > 3 ){
// bControl->m_spWebBrowser2->GoForward();
bControl->goForward();
count++;
exe = 1;
bControl->m_spWebBrowser2->put_StatusText(str.AllocSysString());

// bControl->m_spWebBrowser2->Navigate(bstrURL, &vtEmpty, &vtEmpty, &vtEmpty, &vtEmpty);

Sleep(200);
}else if (shock < -3){
// bControl->m_spWebBrowser2->GoBack();
bControl->goBack();
count--;
exe = 1;
bControl->m_spWebBrowser2->put_StatusText(str.AllocSysString());
Sleep(200);
}
}
Sleep(100);
}

}

Re: Access Violation occur when use goForward() or goBack() method in IWebBrowser2

Roger Stoltz24-Nov-06 4:55

Roger Stoltz

24-Nov-06 4:55

The explanations for the crashes can be numerous, but one serious conceptual error has been made in the code you provided:
You've spawned a secondary thread that uses the interfaces you've got in the main thread.

When you access COM servers from other threads than the one that created the server, you have to (a) initialize the new COM apartment with a call to CoInitialize() and (b) marshal the interface to the secondary thread.

You have to fix this before digging further down in your chase for the cause of the crashes.
You can read about it in MSDN[^], or Lim Bio Liong's excellent articles on the subject here (1)[^] and here (2)[^].

Hope this helps
--
Roger

Adding function to interface.

Suresh H22-Nov-06 18:15

Suresh H

22-Nov-06 18:15

Hello All,

I have small and simple COM program to access a Add function in Dll and I am accessing this function from main program.
For the simple add function it is working, interface and dll files are working properly.

For this interface I am trying to add one more function by name getdate() which of return Char* .. can any one please help how to declare the getdate() function in interface ???

Below are declaration and files with there names ….

// File interface.h
// This file contains interface related declarations.

#ifndef _A_INTERFACE_H_
#define _A_INTERFACE_H_

DECLARE_INTERFACE_(IMyA,IUnknown)
{
STDMETHOD_(LONG,MyAdd)(INT,INT) PURE;
};

--- ---

--- ---

file :- MyA.h

class CMyA : public CCmdTarget
{
DECLARE_DYNCREATE(CMyA)

CMyA();

-- -- -- - - -- -- -- - -

-- -- -- - - -- -- -- - -

-- -- - -

-- -- - --- -- -- - --- -- -- - -

protected:
virtual ~CMyA();
DECLARE_MESSAGE_MAP()

BEGIN_INTERFACE_PART(MyAObj,IMyA)
STDMETHOD_(LONG,MyAdd) (INT,INT);
END_INTERFACE_PART(MyAObj)

DECLARE_INTERFACE_MAP()
DECLARE_OLECREATE(CMyA)

};

// MyA.cpp : implementation file

-- -- -- --- -- --

//IMyA Functions
STDMETHODIMP_ (LONG)
CMyA::XMyAObj::MyAdd (INT x,INT y)
{
return (x+y);
}

-------------------------------

// function to be added to Interface can u please help me how to declare this function in interface.

char* getDate()
{
struct tm *newtime;
char am_pm[] = "AM";
-- - - -
--- - -- - - -

}

Thanking you,
Suresh H.

How can i call C# interface function from C++ ( visual 6 ) application ?

Yanshof22-Nov-06 0:55

Yanshof

22-Nov-06 0:55

Hi All,

I need to know how can i call from application that i wrote in C++ in visual studio 6 a function from C# ( visual 2005 ) application ?

What i mean is call function in way like calling com interface function - ( in com i can call function from application X that i have pointer to it in application Y ).

Can i do it ?

Thanks for any help.

Re: How can i call C# interface function from C++ ( visual 6 ) application ?

ThatsAlok3-Dec-06 19:33

ThatsAlok

3-Dec-06 19:33

Yanshof wrote:
What i mean is call function in way like calling com interface function - ( in com i can call function from application X that i have pointer to it in application Y ).

read Interoperability dude~

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you

How do you implement an Event Sink without a Type Library?

Bathory's Curse21-Nov-06 7:01

Bathory's Curse

21-Nov-06 7:01

Hi,

How does one go about implementing an event sink (in CLI C++) for a COM object that supports the IConnectionPoint interface without access to it's type library. In essence, how can it be done late-bound at runtime?

More information:

I'm having trouble implementing a late bound event sink (without a type library). I would like to subscribe to events from a COM object that implements the IConnectionPoint interface. I instantiate the object using Activator::CreateInstance. I then enumerate its connection points using IConnectionPointContainer::EnumConnectionPoints. Upon successfully obtaining a pointer to the IConnectionPoint interface, I call its Advise function like Advise(this, cookie), where this is a simple public ref class. Initially, the function was failing with a Cast Exception. However after specifying the ComVisible(true) for the class, the function succeeded returning a cookie.

Now, my issue is, the source COM object uses the IDispatch and IUnknown interfaces of the object I pass it to determine what events to send and to actually send the events. How can I specify my own implementations of these two interfaces, so that they get called instead of the default system implementation? Maybe I am approaching this the wrong way, but I haven't found any documentation regarding late-bound event handling from COM objects.

Thanks!

Re: How do you implement an Event Sink without a Type Library?

Stephen Hewitt21-Nov-06 11:50

Stephen Hewitt

21-Nov-06 11:50

An event sink is just an interface, typically an IDispatch interface. If it is an IDispatch interface normally you only need to implement IDispatch::Invoke.

Steve

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