Re: IScriptControlPtr bad multithreaded behaviour? - COM Discussion Boards

Anonymous15-Apr-04 12:34

15-Apr-04 12:34

I'm calling a COM function inside this C++ function. How to convert char* to
BSTR and BSTR*?
void myFunction( IN char* name,
OUT char* path)
{
MyCOMFunction( CComBSTR( name), ??);
}
The COM function prototype is like this:
HRESULT MyCOMFunction(IN BSTR name,
OUT BSTR* path)
{

}
Thanks.

Re: How to convert OUT char* to OUT BSTR*?

Anonymous15-Apr-04 19:25

Anonymous

15-Apr-04 19:25

void myFunction(char* name, char* path)
{
     BSTR bstrPath;
     MyCOMFunction(CComBSTR(name), &bstrPath);
     
     // Convert the BSTR (bstrPath) to a multi-byte character
     // array (path) using wcstombs  
        
     // MyCOMFunction allocated the BSTR; the client however 
     // must free it. Call SysFreeString(bstrPath)

}

Hope this helps, Smile | :)

writing data to the opc server

Anonymous15-Apr-04 1:23

Anonymous

15-Apr-04 1:23

hi,
i have an client application through which i can fetch the data of the opc server now i have to update the data. please anyone help me

copying a COM object

Shielsy1014-Apr-04 4:07

Shielsy10

14-Apr-04 4:07

I have function which i pass in parameter IXMLDOMDocument **paXMLDocument
plus a CComBSTR string. Inside the function i create a new document and load
the string which i passed in using loadXML.

My problem is how can i copy this document to the **paXMLDocument document
so it can be passed back from the function. Also this function should create
a new document for me as well - before i call the function below i define
paXMLDocument as CComPtr <ixmldomdocument> paXMLDocument and I dont call
cocreateinstance. I would like to get the function to create it for me.

Any assistance would be appreciated.

Thanks

Andy

short getDoc (IXMLDOMDocument **paXMLDocument, CComBSTR sXMLDoc)
{

CComPtr<ixmldomdocument> paXMLDoc;
HRESULT hr = ::CoCreateInstance(CLSID_DOMDocument, NULL,
CLSCTX_INPROC_SERVER, IID_IXMLDOMDocument, (void**)&paXMLDoc);
if (FAILED(hr))
return -1;

VARIANT_BOOL bIsSuccessful = FALSE;
// load xml document
hr = paXMLDoc.loadXML(sXMLDoc, &bIsSuccessful);
if ((FAILED(hr)) || (bIsSuccessful == VARIANT_FALSE))
return -1;

//
// this doesnt work!!!!!
//
hr = paXMLDoc->QueryInterface( paXMLDocument);
if (FAILED(hr))
return -1;

return 1;

}

Re: copying a COM object

Mike Dimmick14-Apr-04 4:56

Mike Dimmick

14-Apr-04 4:56

Really an ATL/C++ question. After loading the XML document:

*paXMLDocument = paXMLDoc.Detach();

Stability. What an interesting concept. -- Chris Maunder

Help on getting OpenOffice on the web

locktotten14-Apr-04 0:36

locktotten

14-Apr-04 0:36

We are doing a project doing a study on the posibility to make OpenOffice into a “webprogram”. This is similar to a web mail.

To describe the project better, the whole point is to be able to use OpenOffice anywhere in the world, with any web browser, any operating system etc. We currently have a web server to use for the server part. The Client part would be a web browser and that’s it. Similar to thin Client but better, where there will be no specific client installation.

The thing is, I am thinking on using Java Applets and using some ActiveX implementation. Maybe it could be done with just a plugin to the internet explorer im not shure.

Any leads and information on this is welcome.

MVH

Locktotten(Sweden)…

Locktotten...

IScriptControlPtr bad multithreaded behaviour?

humps13-Apr-04 11:11

humps

13-Apr-04 11:11

I have a VC++ program in which two IScriptControlPtr smart pointers are created in thread "1". Thread "2" calls the Run() method against the first IScriptControlPtr, and thread "3" calls the Run() method against the second one. All three threads call CoInitializeEx(NULL,COINIT_MULTITHREADED) first.

What I am finding is, thread 2 (or 3) blocks until thread 3 (or 2) has finished, even though they are running against separate IScriptControlPtr objects (and no other thread is trying to access these smart pointers).

Has anyone seen this behaviour before / is this to be expected?
Is there perhaps bad multithreaded handling in msscript.ocx? (I am using version 1.0.0.7615).

Many thanks,
Neil.

Re: IScriptControlPtr bad multithreaded behaviour?

Mike Dimmick13-Apr-04 23:39

Mike Dimmick

13-Apr-04 23:39

The msscript.ocx control is registered with the Apartment threading model. This means it has affinity with the thread on which it is created - COM will force calls from a different thread onto the thread which created the object.

If you want to use multiple script controls concurrently, you should create them on the threads which will call their methods.

I'm not sure, but I think using COINIT_MULTITHREADED with an Apartment object will cause you to get a proxy to the object even though you're calling an object on the same thread.

Stability. What an interesting concept. -- Chris Maunder

Re: IScriptControlPtr bad multithreaded behaviour?

humps14-Apr-04 20:20

humps

14-Apr-04 20:20

Thanks for your reply, Mike. I suspected this might be the case.
When you say "The msscript.ocx control is registered with the Apartment threading model" ... is this documented somewhere on the web? I spent some time searching, but don't recall that particular chestnut Frown | :-(

It might be nice to have some definitive documentation for once, rather then relying on Google and trial and error!!!!

Re: IScriptControlPtr bad multithreaded behaviour?

Mike Dimmick15-Apr-04 1:50

Mike Dimmick

15-Apr-04 1:50

It's not documented on the web AFAIK, but ActiveX controls are almost always registered with the Apartment threading model (although you'll see some not marked at all, therefore running on the primary thread, and some marked Both). An ActiveX control (as opposed to a component) is intended for use on a window.

As for how msscript.ocx is registered, I used regedit and searched HKEY_CLASSES_ROOT\CLSID for that filename.

I never asked why you're not just using the script engines directly. This page[^] suggests which you should use when.

Stability. What an interesting concept. -- Chris Maunder

Re: IScriptControlPtr bad multithreaded behaviour?

humps15-Apr-04 20:41

humps

15-Apr-04 20:41

The reason I didn't use the script engines directly is - I didn't know about them! I am just a beginner with this to be honest. Thanks for bringing it to my attention, it definitely looks like the way to go.

cheers,
Neil

IHttpNegotiate

TimWallace12-Apr-04 5:24

TimWallace

12-Apr-04 5:24

I have an app in which I want to be able to inspect the headers coming in to IE. Through a little research, I've determined that I need to use IBindStatusCallback and IHttpNegotiate to accomplish this. I've derived my COM object including these two interfaces and have implemented them. In my FinalConstruct(), I call RegisterBindCallback(). My problem is that none of the methods of the above two interfaces appear to be called. is anyone familiar with these methods? What am I missing?

Thanks.

screen saver

amir_iiui12-Apr-04 1:55

amir_iiui

12-Apr-04 1:55

i want to Build a screen saver which should terminate when i move the mouse or press key board button. During the execution of the screen saver its dialog painting should change with different colors and pattern with a specified time interval.

about filing

amir_iiui12-Apr-04 1:52

amir_iiui

12-Apr-04 1:52

i want to store some records on disk using iostream.h

these records are about persons. i have to store pictures of persons and then i want to retrieve/search these records. and show the picture on the dialog. can some one help me in doing this

How Calling Com Function Via javascript or VB script

Anonymous11-Apr-04 18:47

Anonymous

11-Apr-04 18:47

Can any one tell me that how can i call a com / Activex function via javascript and vbscript. Currently i am doing some thing as follows but in web page i get the error that object doesnt support this property or method :

<body>
<object id=MUMSocket1 style="LEFT: 0px; TOP: 0px" classid="clsid:BDBEED17-BE31-475E-966F-28A3F07FDBBD" VIEWASTEXT>
</object>
<input type="button" value="Button" id=button1 name=button1 onclick=ini()>
<script language ="javascript" >
function ini()
{
MUMSocket1.Initialize () // getting Error here
//Err is: Object Doesnt Support this Property Or Method
}
</script>
</body>

Re: How Calling Com Function Via javascript or VB script

Milton Karimbekallil11-Apr-04 22:57

Milton Karimbekallil

11-Apr-04 22:57

hi
What you have done to call the ActiveX function is correct only. This is the way to call a com object function on client side thru html-jscript. If still it shows err, the two possibilities that I found are

1) Mostly it will be because of your security settings of Internet explorer. Did u get any message saying "Your current security settings prohibit running activex controls on this page ........". If yes, then no method will get executed. Go to Internet Options--> Security tab--> Custom Level and select all ActiveX related radio buttons to 'Enable'. Open a new explorer window and try. Mostly the problem will be because of this only.

2) Second possibility is, make sure that the component with the given clsid have that method exposed. Search registry for that clsid under HKEY_CLASSES_ROOT\CLSID and go to your clsid. Then go to InprocServer32 SubKey, check the default string value, this will give you the path of the component registered for that clsid. Check whether that dll/ocx has the given function exposed (By referring that dll/ocx to a new vb project or by using OLE Object viewer). Because even if u r sure that the component has that method, the client machine might have an older version installed.

rgds..mil10

How can I add a function to COM?

ilavl11-Apr-04 17:11

ilavl

11-Apr-04 17:11

I am a learner and I ve got a COM.
I try to learn the structure of the COM, and then did three steps to add a function to the COM and its Interface:
1. In DECLARE_INTERFACE_(ITest4, IUnknown), I added a fuction like this:

STDMETHOD(ChangeTest) (THIS_
int nToBeChanged
)
PURE;

2. In the CTest4 declaration I added:
STDMETHODIMP ChangeTest(int nToBeChanged);

3. In the CTest implement I appended :
HRESULT CNvRender::ChangeTest(int nToBeChanged)
{
m_nChangeNo = nToBeChanged;
::MessageBox(NULL, "fasdf", "hehe",MB_OK);
return 0;
}

4. register it and get the interface pointer in my file:
ITest4 *p;
......(get the pointer p and check it whether it is valid)
p->ChangeTest(2);

and here the problem arise: Access Violation

What's wrong with it ? I need your help.

Outlook security bypass question.

Brigsoft10-Apr-04 7:41

Brigsoft

10-Apr-04 7:41

I write spam filter and want validate senders from address book. But some versions of outlook show a warning message. Is it possible to bypass it?

Thanks.

================================
My products are here!

Re: Outlook security bypass question.

Milton Karimbekallil11-Apr-04 23:54

Milton Karimbekallil

11-Apr-04 23:54

hi
Ya... This is a security alert, since Service Pack 3 for Outlook XP. If any program tries to access Outlook address book it will display that alert msg. ASAIK there is no way to disable this. Most of the mail attachment script viruses are using this address book to spread. So after the launch of ‘I LOVE U’ virus (it is the first one in this series) Microsoft released this patch. All these address entries are there in our hard disk as .WAB files. But it is encrypted and we can’t read it directly.

Otherwise try some brute force approch - find that Out look warning display dialog, select that chkbox and click the 'Yes' button programatically using keybd_event or SendInput API.

rgds...mil10

Calling Com Function Via javascript or VB script

Anonymous9-Apr-04 18:12

Anonymous

9-Apr-04 18:12

<HTML>
<BODY>

<OBJECT id=MUMSocket1 style="LEFT: 0px; TOP: 0px" classid="clsid:BDBEED17-BE31-475E-966F-28A3F07FDBBD" VIEWASTEXT>
<PARAM NAME="_Version" VALUE="65536">
<PARAM NAME="_ExtentX" VALUE="2646">
<PARAM NAME="_ExtentY" VALUE="1323">
<PARAM NAME="_StockProps" VALUE="0"></OBJECT>


<INPUT type="button" value="Button" id=button1 name=button1 onclick=ini()>

<script language ="javascript" >
function ini(){
MUMSocket1.Initialize () // getting Error here

}

</script>

</BODY>
</HTML>

Re: Calling Com Function Via javascript or VB script

Milton Karimbekallil11-Apr-04 21:12

Milton Karimbekallil

11-Apr-04 21:12

hi
What you have done to call the ActiveX function is correct only. This is the way to call a com object function on client side thru html-jscript. If still it shows err, the two possibilities that I found are

1) Mostly it will be because of your security settings of Internet explorer. Did u get any message saying "Your current security settings prohibit running activex controls on this page ........". If yes, then no method will get executed. Go to Internet Options--> Security tab--> Custom Level and select all ActiveX related radio buttons to 'Enable'. Open a new explorer window and try. Mostly the problem will be because of this only.

2) Second possibility is, make sure that the component with the given clsid have that method exposed. Search registry for that clsid under HKEY_CLASSES_ROOT\CLSID and go to your clsid. Then go to InprocServer32 SubKey, check the default string value, this will give you the path of the component registered for that clsid. Check whether that dll/ocx has the given function exposed (By referring that dll/ocx to a new vb project or by using OLE Object viewer). Because even if u r sure that the component has that method, the client machine might have an older version installed.

rgds..mil10

HWND problem with list control

krugger8-Apr-04 21:44

krugger

8-Apr-04 21:44

Hi all;

I am having a serious problem with an application that I am currently developing. It is an SDI application consisting of a CdialogBar (Well, some sort of derivation of that class atually). I have to initialise tabs and add list controls and tree controls on them.

This works just fine as I have added initialisation code to the InitDialogBar() function that I have created for the DialogBar. The problem is that I need to fill these controls (list and tree) dynamically. This can only happen when users log onto the program. InitDialogBar() is triggered well before user log-in.

So I have created a function in the DialogBar class to add/remove unnecessary items in the controls when user log-in. I use a global pointer to access this function in the login-dialog stuff. However, I always get the following assertion error:

AFXWIN_INLINE HICON CWnd::SetIcon(HICON hIcon, BOOL bBigIcon)
{ ASSERT(::IsWindow(m_hWnd)); return (HICON)::SendMessage(m_hWnd,

It occurs in line 309 of AfxWin2

Obviously, it is requiring a handle to the DialogBar but I just can’t figure out how to make it work as I am quite new to Visual C++ programming.

Can somebody, please please help me.

Thank you,

Krugger

How can I use a COM?

ilavl8-Apr-04 15:14

ilavl

8-Apr-04 15:14

I registered a COM named "red.ax", and then
1. DEFINE_GUID
2. add the red.lib into the 'link' page
3. CoCreateInstance it.
but it get error when linking:
hehefaintDlg.obj : error LNK2001: unresolved external symbol _CLSID_NvRender4
is it has something to do with the .lib ?
How could I get through it?

Re: How can I use a COM?

Renjith Ramachandran11-Apr-04 2:01

Renjith Ramachandran

11-Apr-04 2:01

try to include _i.c and .h files

I want to change Myself..Can u help me? Smile | :)

Re: How can I use a COM?

ilavl11-Apr-04 20:36

ilavl

11-Apr-04 20:36

I've resolved the problem.
it was Init_guid.h havent been included.

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