Re: Use GetActiveObject first - COM Discussion Boards

Steve S23-Jun-03 21:50

23-Jun-03 21:50

Sounds like you need to dump out what the values (and addresses) in the structure are. The error you're getting sounds like a BSTR being freed twice, or similar.

Steve S
[This signature space available for rent]

Re: COM+ Error

Aravinthan25-Jun-03 3:11

Aravinthan

25-Jun-03 3:11

I feel this B_Date is already freed somewhere else..!
check if b_date is not null and pointing to a valid address!

-Aravinthan

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Inproc COM server question?

Obi-Wan-Kenobi17-Jun-03 18:30

Obi-Wan-Kenobi

17-Jun-03 18:30

Any COM experts around here?

If an inproc server is implemented in a DLL then is it possible that two clients running in two different process (in the same machine) can load the same COM server DLL into thier own address space?

Inproc COM servers are implemented in DLL's, does that mean I can create as many instances of this server as possible (just like a DLL?) ?

Re: Inproc COM server question?

valikac18-Jun-03 6:57

valikac

18-Jun-03 6:57

Correct.

Kuphryn

Re: Inproc COM server question?

Giles22-Jun-03 5:08

Giles

22-Jun-03 5:08

Yep, and the really cool thing is, on NT, they are mapped to the same binary file, and don't know it, though of course they do not have each others data mapped, just the binary image of the DLL.

Thats how you can have say 100 processes running all making use of user32.dll don't eat up loads of memory as NT hides that fact that its shared.

"Je pense, donc je mange." - Rene Descartes 1689 - Just before his mother put his tea on the table.

Shameless Plug - Distributed Database Transactions in .NET using COM+

MSWord Applications

Madmaximus17-Jun-03 10:01

Madmaximus

17-Jun-03 10:01

Hi everyone,

Does anyone know why I can't seem to run multiple MSWord applications simultaneously? I am running a multithreaded server that opens a Word application per thread. The server then open documents and prints them. It works fine if I put a sleep statement in the code, which suggests that there is a synchronization issue. Here is psuedo code to help explain:

#include <atlbase.h>
#import "C:\WINNT\ServicePackFiles\i386\mqoa.dll" no_namespace
#import "C:\Program Files\Microsoft Office\Office\mso9.dll" raw_interfaces_only
#import "C:\Program Files\Microsoft Office\Office\msword9.olb" raw_interfaces_only rename("ExitWindows","WordExitWindows")

class MSWord()
{
public:
MSWord ()
{
m_hResults = CLSIDFromProgID(“Word.Application”, &clsid);
if (FAILED(m_hResults))
{
throw “Error”;
}
m_hResults = m_pWord.CreateInstance(clsid, NULL);
m_hResults = m_pWord->get_Documents(&m_pDocs);
}

void printDoc(string strDoc)
{
CComBSTR comBstr = strFile.c_str();
CComVariant var(comBstr);

VARIANT vOpt;
vOpt.vt = VT_ERROR;
vOpt.scode = DISP_E_PARAMNOTFOUND;

m_hResults = m_pDocs->Open(&var, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &pDoc);
if (FAILED(m_hResults))
return;

m_hResults = pDoc->PrintOut(&vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &var, &vOpt);

if (FAILED(m_hResults))
{
cout << " Failed to print " << endl;
return;
}

Sleep(20);

pDoc->Close(COleVariant((short)false), &vOpt, &vOpt);
::SysFreeString(comBstr);
}

private:
Word::_ApplicationPtr m_pWord;
Word::DocumentsPtr m_pDocs;
Word::_DocumentPtr pDoc;
CLSID clsid;
};

static void Foo()
{
MSWord msWord;
MsWord.PrintDoc(“Hello.doc”);
}

void main(void)
{
HANDLE hThreads[10];

for (int I = 0; I < 10; ++I)
hThreads[I] = CreateThread(Foo);

WaitForMultipleObjects(hThreads, INFINITE);
}

Is there a way to create only one Word application and pass it to all of the threads? Confused | :confused:

I’m using MSVisual C++ 6.6 compiler.

Any help would be greatly appreciated. Big Grin | :-D

Ken

Use GetActiveObject first

Vi219-Jun-03 19:58

Vi2

19-Jun-03 19:58

<quote>Is there a way to create only one Word application and pass it to all of the threads?

MSWord ()
{
	m_hResults = CLSIDFromProgID("Word.Application", &clsid);
	if (FAILED(m_hResults))
	{
		throw "Error";
	}

	m_pWord.GetActiveObject(clsid);
	if( !m_pWord )
		m_hResults = m_pWord.CreateInstance(clsid, NULL);

	if( m_pWord )
		m_hResults = m_pWord->get_Documents(&m_pDocs); 
}

With best wishes,
Vita

Re: Use GetActiveObject first

Madmaximus20-Jun-03 4:56

Madmaximus

20-Jun-03 4:56

Hi, thanks for the help. Wink | ;)

I tried your suggestion but I can't get it to work. When I pass a pointer of MSWord to each of the threads the threads error on the open function.
m_hResults = m_pDocs->Open(&var, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt,
&vOpt, &vOpt, &vOpt, &vOpt, &pDoc);

If I create an instance of MSWord object in each thread then each thread gets its own instance of Word.exe from the "m_hResults = m_pWord.CreateInstance(clsid, NULL)" function. That’s because m_pWord is NULL for each object’s constructor that is created by each thread.

So, I’m still wondering how to get one instance of MSWord in each of the threads.

Thanks again,
Ken

ActiveX stock property issue

Marion2817-Jun-03 7:41

Marion28

17-Jun-03 7:41

Hi all,
I'm writing an ActiveX button control that uses the Caption stock property to display the text on the face of the button. I'm having a big problem getting the caption stock property to work correctly. I've added the caption stock property to my control class using the automation tab of classwizard, and added the appropriate drawing code in my OnDraw() function of the control. Everything works fine using the activex test container, but everything goes haywire in the program I embed the control in. In the application, the button face displays the caption as entered into the property page of the control, but when I try to change the caption using the stock caption put property method, the first time it will change, then any subsequent changes are not reflected, and the text on the button face is frozen (cannot be changed). This is also reflected in the VC++ 6.0 IDE. When I open the control property page in the IDE of the project I'm embedding the control in, and set the caption for the first time, it looks fine. But when if I need to change the caption in the IDE using the property page, it reverts back to the original caption. Does anyone have any ideas?

I've tried using MSDN to no avail, and can't find anything like this on google.com.

The activex control project runs under windows 2000, and compiles and registers fine. The project I'm embeding the control under also runs under windows 2000 and has no compile errors, but also uses the directx sdk.

I'm willing to send the source code for both projects to anyone willing to help me with this issue.

Please help!! This problem is maddening to me.

Thanks all,
Marion
Cry | :((

how do i know whether an interface is createable or not?

safee ullah16-Jun-03 0:25

safee ullah

16-Jun-03 0:25

hi there...

i have some interfaces and i need to be able to handle these interfaces by creating the relevant objects in the DllGetClassObject..

But for that i need to know which interfaces are createable..how do i know that???

thanks

regards

Re: how do i know whether an interface is createable or not?

J. Schermerhorn16-Jun-03 3:54

J. Schermerhorn

16-Jun-03 3:54

You generally will want to setup if/else logic from within DllGetClassObject to test for the different CLSID's in your server.(The only interfaces you will want to return through DllGetClassObject are IID_IClassFactory or IID_IUnknown since the class factories QueryInterface logic will only be checking for those two identifiers).

For example:

<br />
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void** ppv)<br />
{<br />
   HRESULT hr;<br />
   if (rclsid == CLSID_MyFirstCoClass)<br />
   {	<br />
      MyFirstCoClassFactory* pCF1 = new MyFirstCoClassFactory();<br />
      hr = pCF1->QueryInterface(riid, ppv);<br />
      if (FAILED(hr))<br />
      {<br />
         delete pCF1;<br />
      }<br />
   }<br />
   else if (rclsid == CLSID_MySecondCoClass)<br />
   {<br />
      MySecondCoClassFactory* pCF2 = new MySecondCoClassFactory();<br />
      hr = pCF2->QueryInterface(riid, ppv);<br />
      if (FAILED(hr))<br />
      {<br />
         delete pCF2;<br />
      }<br />
   }<br />
   else<br />
   {<br />
      hr = CLASS_E_CLASSNOTAVAILABLE;<br />
   }<br />
   return hr;<br />
}<br />

Hope this answers your question!

-John

Re: how do i know whether an interface is createable or not?

safee ullah16-Jun-03 19:34

safee ullah

16-Jun-03 19:34

Thanks a lot John..

The information you provided was certainly helpful..But i wanted to know that if i have 5 or 6 interfaces already defined with me and i want to determine which of them is cocreateable..how do i know that??
If i know that a specific interface is createable only then will i call it and check for it in the DllGetClassObject..

regards

How to Implement DllGetClassObject??

Anonymous14-Jun-03 1:48

Anonymous

14-Jun-03 1:48

hi there..

i am working on an ole control and need to implement the method DllGetClassObject..
ne ideas???? what to do?

thanks

Re: How to Implement DllGetClassObject??

Anonymous14-Jun-03 2:23

Anonymous

14-Jun-03 2:23

DllGetClassObject is one of four DLL server exports that are required.

DllGetClassObject exposes class factories for all objects in a given server. This export will return an IClassFactory pointer to the client.

Instantiate a class factory object (using the C++ new operator) and then call QueryInterface to obtain an IUnknown or IClassFactory interface pointer. Check the return value of the QueryInterface invocation with the FAILED or SUCCEEDED macros. If the call failed delete your class factory object and then return the HRESULT.

Regards,

componet for INTERNET EXPLORER programming in .NET?

Asim N.13-Jun-03 3:02

Asim N.

13-Jun-03 3:02

hello,
i want to do some IE programming. in .net
but i am not able to have the componet that i should add.
can someone guide me on this.
ASIM

Asim

Visual Studio Add-In --> IApplicationEvents save event

Amir Harel12-Jun-03 4:25

Amir Harel

12-Jun-03 4:25

Hi all, i'm writting a Add-in to the visual studio 6, and i need to catch event before the document is being saved, while the IApplicationEvents supplies DocumentSave which is fired after it was saved.

Does anyone knows how to solve my problem?

Amir Harel
My boss always tell me: Why we always search for the generic solution for a specific problem...

Re: Visual Studio Add-In --> IApplicationEvents save event

Anonymous19-Jun-03 21:37

Anonymous

19-Jun-03 21:37

ConnectionPoints.

ItypeInfo::Invoke paramerters

safee ullah11-Jun-03 23:39

safee ullah

11-Jun-03 23:39

hi there
i needed help regarding the first paramenter of the method ITypeInfo::Invoke(
VOID FAR* pvInstance,
MEMBERID memid,
unsigned short wFlags,
DISPPARAMS FAR* pDispParams,
VARIANT FAR* pVarResult,
EXCEPINFO FAR* pExcepInfo,
unsigned int FAR* puArgErr
);

from where or how do i get pvInstance?

thanks
regards

Re: ItypeInfo::Invoke paramerters

Hans Ruck12-Jun-03 0:37

Hans Ruck

12-Jun-03 0:37

safeeullah wrote:
from where or how do i get pvInstance?

Generally ITypeInfo::Invoke is used to implement IDispatch::Invoke. So, the pvInstance parameter should be the implementing class' this. Something like:

HRESULT __stdcall IDispatch_Derived_Class::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid,
     WORD wFlags, DISPPARAMS* pDispParams, VARIANT* pVarResult,
     EXCEPINFO* pExcepInfo, UINT* puArgErr)
{
  return m_pTypeInfo->Invoke(this, dispIdMember, wFlags,
     pDispParams, pVarResult, pExcepInfo, puArgErr);
}

or the equivalent

HRESULT __stdcall IDispatch_Derived_Class::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid,
     WORD wFlags, DISPPARAMS* pDispParams, VARIANT* pVarResult,
     EXCEPINFO* pExcepInfo, UINT* puArgErr)
{
  return DispInvoke(this, m_pTypeInfo, dispIdMember,
     wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
}

rechi

Re: ItypeInfo::Invoke paramerters

safee ullah12-Jun-03 19:44

safee ullah

12-Jun-03 19:44

thanks a lot..
got it..
Smile | :)

kindest regards
safee

COM exe under win98

Ryszard Krakowiak10-Jun-03 21:20

Ryszard Krakowiak

10-Jun-03 21:20

Hi
I've COM exe server. It registers on WinNT based platforms.
I can't register it under Win98.
It is possible to do this ?

I've error in
_Module.UpdateRegistryFromResource(IDR_AtlExe, TRUE);
hRes is 0x80040154 (class not registered).

In all others calls before _Module.UpdateRe... are ok (hRes is 0).

I use VC 6 with sp5 and simple code generated from ATL wizard with one interface with one method.

Thx 4 Hlp

InvokeHelper.. More info needed!

harinath10-Jun-03 19:16

harinath

10-Jun-03 19:16

InvokeHelper() function...

//MSDN says
This method calls the object method or property specified by dwDispID, in the context specified by wFlags. The pbParamInfo parameter specifies the types of the parameters passed to the method or property. The variable list of arguments is represented by ... in the syntax declaration.

well, that is what MSDN says about InvokeHelper method of COleDespatcher class.

Now My confusion is....

I am trying to understand a project, which is an activex control whose purpose is to display some graphical interface to the data given from a server.

Here the OCX project is using another library which is a wrapper for another library, customized to the requirements of OCX project.

When I tried to trace how the flow of function call is going on..
it is happening like this..

my ocx project is calling method from wrapper project which is using InvokeHelper(..).
my collegue says "it is all com funda".. and he showed me a method in another project where actual code is present.
The function call is something like this.

InvokeHelper(0xa, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms,<br />
	iTraceNumber, &strTraceId, strSource);<br />

But How do I come to know what is happening here..
it is all confusing.

any ideas..?
meanwhile I try to go thru the COM section of codeguru and codeproject.

Thanx in advance

Harinath

Harinath Reddy
HOneywell Technology Solutions Lab,
Bangalore,
India-560076

How call the javascript 'escape' function from C++ ?

Thierry Maurel10-Jun-03 7:24

Thierry Maurel

10-Jun-03 7:24

Hello,
is there a simple way to call the javascript escape function from c++ app (mfc)?
I need to generate a html slideshow from a selection into a database, but it seems that certains strings (valid in c++) can be invalid in the html file.
For ex : "\\test\\" in c++ are generated into "\test\", so the last \" break the string Wink | ;-)

So my idea is to add an unescape into the generated html, but the counterpart is a call to escape in the c++ part...
I already embed an IE browser in my application.

Another bad point is that all calls are in a loop, so I want to avoid slow calls !
Thanks in advance

Thierry
Isotools Software Engineer

IDispatch, ITypeInfo et al

Jörgen Sigvardsson10-Jun-03 2:26

Jörgen Sigvardsson

10-Jun-03 2:26

Could someone enlighten me on how to retrieve the name of an object implementing IDispatch? With the name I mean the coclass-name as specified in the IDL-file.

--
"It's a condition of mental divergence, I find myself on the planet Olgo part of a intellectual elite, prepared to subjugate the barbarian hordes on Pluto, but even though this is a totally convincing reality for me in every way, nevertheless Olgo is actually a construct on my psychee. I am mentally divergent in that I am escaping certain unnamed realities that plague my life here."

Re: IDispatch, ITypeInfo et al

Hans Ruck11-Jun-03 22:11

Hans Ruck

11-Jun-03 22:11

See the implementation of XYDispDriver::LoadTypeInfo in XYDispDriver.cpp from this article[^]'s sources. It's not exactly what you need but could be a good starting point.

rechi

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