COM Discussion Boards

com interop exception with IIS webserver using in asp.net web application

30-Aug-09 14:34

(Disclaimer: I've not done this myself, it's from some knowledge of the docs).

use IShellFolder::ParseDisplayName[^] to get a shell item ID list for the folder your string refers to.
use IShellFolder::BindToObject[^] to get an IShellFolder relating to the shell item ID list for your folder.
use IShellFolder::CreateViewObject[^] to get the IShellView interface.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

.net Programmer 200928-Aug-09 2:50

.net Programmer 2009

28-Aug-09 2:50

we are using any VB 6.0 com component through interop in asp.net web application. surprisingly it works fine
with the visual studio web server but does not work with IIS webserver. we also impersonate the machine user with highest privilages and other access permission but it still does not work and throw the COM interop exception.

Any help in this would be highly appreciated.

Hosting a .NET 2.0 winfom in MFC COM C++ 2003

AbhishekBK27-Aug-09 1:01

AbhishekBK

27-Aug-09 1:01

Hello,

I have been trying to find some resources for hosting a .NET winform control in a MFC \ COM app written in C++ 2003 (7.1). I could find help for .NET 2.0 and C++ 2005 but none for C++ 2003. Could anybody help?

Thanks in advance.

Abhishek
theBOKA

How to do the CoCreateInstance

deadlyabbas26-Aug-09 22:56

26-Aug-09 22:56

How to do the CoCreateInstance,when You have only the DLL path and name
say for example I have a Dll named xyz.dll
I just #import it and register it now how I will get its Class ID to do the CoCreateInstance.
Pleae HELP

Stuart Dootson26-Aug-09 23:13

26-Aug-09 23:13

There will be a structure in the code generated by the #import statement that represents the class. You can do __uuidof(that struct) to get its CLSID. Look at the example I have here using Excel:

#import "libid:00020813-0000-0000-C000-000000000046" version("1.6") auto_search no_dual_interfaces rename("DialogBox", "excelDialogBox") rename("RGB", "excelRGB") rename("DocumentProperties", "excelDocumentProperties") rename("SearchPath", "excelSearchPath") rename("CopyFile", "excelCopyFile") rename("ReplaceText", "excelReplaceText")

int _tmain(int argc, _TCHAR* argv[])
{
   CoInitializeEx(0, COINIT_MULTITHREADED);
   {
      Excel::_ApplicationPtr xl;
      if (SUCCEEDED(xl.CreateInstance(__uuidof(Excel::Application)))) // This is where we get the CLSID.
      {
         // Do stuff with the application pointer
      }
   }
}

HTH!

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

deadlyabbas26-Aug-09 23:52

26-Aug-09 23:52

Thank You very much
But can you please tell me that how to get the IID our we get it in the similar manner.
m_pIDocument.CreateInstance(__uuidof(Excell::IApplication));

Stuart Dootson27-Aug-09 0:07

27-Aug-09 0:07

IID? For the interface? That's determined by the interface pointer class you're using to create the instance. In my example, the IID will be the IID of Excel::_ApplicationPtr, which can be accessed using __uuidof(Excel::_ApplicationPtr), IIRC.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

deadlyabbas27-Aug-09 2:36

27-Aug-09 2:36

Hi,

I have done my code this way
hr = CoCreateInstance(__uuidof(CADFilter::NW_Document),
NULL,
CLSCTX_INPROC_SERVER ,
__uuidof(CADFilter::NW_IDocument) ,
(void**)&m_pIDocument );

But the issuse is I am getting a message box getting pooped up while running the application.
And when I comment my change there is no such issue

Stuart Dootson27-Aug-09 2:58

How to get the CLSID of a COM DLL

27-Aug-09 2:58

deadlyabbas wrote:
the issuse is I am getting a message box getting pooped up while running the application.
And when I comment my change there is no such issue

For a start, what does the message box say?

Also - if m_pIDocument is a smart COM pointer which is of interface type NW_IDocument underneath, then this code is more idiomatically correct:

m_pIDocument.CreateInstance(__uuidof(CADFilter::NW_Document), CLSCTX_INPROC_SERVER);

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

deadlyabbas26-Aug-09 22:04

Re: How to get the CLSID of a COM DLL

26-Aug-09 22:04

Hi,
Following is the code I am trying to do

#import "C:\\Program Files\\BOSS\\SUPPORT\\RealDWG\\cf2407.dll" rename_namespace("CADFilter")

AcRx::AppRetCode acrxEntryPoint (AcRx::AppMsgCode Msg,
void* AppId)
{
// local variables
int cindex;

CADFilter::NW_IDocument *m_pIDocument;
CLSID clsid;
CoInitialize (NULL);
HRESULT hr = CLSIDFromProgID(LPCOLESTR("NW_Document"), &;clsid );
hr = CoCreateInstance( clsid, NULL,CLSCTX_ALL , __uuidof(CADFilter::NW_IDocument) , (void**)&m_pIDocument );
if(SUCCEEDED(hr))
{
AfxMessageBox(_T("Hi"));
}

}But I am getting an " HRESULT hr as an "Invalid class string"

Stuart Dootson26-Aug-09 23:10

debug with /embedding setting does not work on vista

26-Aug-09 23:10

Probably means "NW_Document" isn't a valid ProgID.

Easiest way to find a class's CLSID given the DLL that contains it is probably to use the OLE-COM Object Viewer. Use the 'View Typelib' command to open the DLL. That'll display an IDL representation of the DLLs type library, including IIDs and CLSIDs.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Fwzklmn26-Aug-09 9:15

Fwzklmn

26-Aug-09 9:15

Dear All,
I have a debug version of vc++ project.
The project result will be called by other program using COM interface.
I use "/embedding" at "Command Arguments" ( MSVC++ 2005).
It works just fine with XP..I can debug the project.
But not with Vista...the loader program will load another instance instead connecting to the one that aleady loaded in memory..
Did I miss some settings ?

Thanks..

vista security and out-of-proc COM servers

WayneS21-Aug-09 5:18

WayneS

21-Aug-09 5:18

I am writing an out-of-proc COM server. I would like a single instance of my server to handle all clients. This works OK on Vista for clients running at the same privilege level. But if one client is running at normal privileges and another is running as admin, two separate instances of my server will be launched.

Is there any way to allow a single instance of my server handle all clients?

Wayne

InvokeHelper

MsmVc21-Aug-09 1:37

21-Aug-09 1:37

Hi All
I am getting error error when i am useing InvokeHelper.Function

Declreation in Test Header file
VARIANT Get_List(int* SheetName);
And Define in Cpp file of Test
VARIANT Test::Get_List(int* SheetName)
{
	VARIANT result;
	static BYTE parms[] =
		VTS_PI1;
	InvokeHelper(0x60030002, DISPATCH_METHOD, VT_VARIANT, (void*)&result, parms,
		SheetName);
	return result;
}
use Get_List function in main Class FinalDlg like this
Test objXl;
int sCol=3;
objXl.Get_List(&sCol);

Then i am getting

"Type misMatch"

in class wincore.cpp.
Plz help me

Vi221-Aug-09 2:07

Vi2

21-Aug-09 2:07

"result" variable is uninitialized.

With best wishes,
Vita

MsmVc21-Aug-09 2:18

21-Aug-09 2:18

Thanks for reply.
But result variable is initialize here

VARIANT result;

Sorry can you describe more.

Vi221-Aug-09 2:30

Vi2

21-Aug-09 2:30

No, this is uninitialized variable. But it doesn't help as I see the code of MFC.

So, I think that VTS_PI1 is unapplicable here. Use VTS_PUI1 or VTS_PI4.

With best wishes,
Vita

MsmVc21-Aug-09 2:41

21-Aug-09 2:41

Ok i use

VTS_PUI1 or VTS_PI4.

both now error is same.
If you need example code then i will give you.I need help.

Vi221-Aug-09 2:44

Vi2

21-Aug-09 2:44

What declaration of method 0x60030002 do you have? What is a "Test objXl"?

With best wishes,
Vita

MsmVc21-Aug-09 2:50

21-Aug-09 2:50

See i don't much about InvokeHelper.I had download a project from Codeproject and make new project with the help of downloaded project.I am sending you a project link which have example code and Dll.
Link is here
Automating Microsoft Excel and Word Together[^]
I am creating a new dll and write a new function.

Public Function Get_List(SheetNumber As Long) As String
   '   Dim myExcel As Object
   Dim Counter1 As Integer
   Dim Returnstring As String
        Dim myWorkBook As Excel.Workbook
        Dim tworksheet As Excel.Worksheet

  '      myExcel = CreateObject("Excel.Application")
 '       myWorkBook = myExcel.Workbook.Open("C:\sample.xls")

        For Each tworksheet In myWorkBook.Worksheets
    '        Me.ListBox1.Items.Add (tworksheet.Name)
    Returnstring = tworksheet.Name
    If iindex = Counter1 Then
    Get_List = Returnstring

    End If
    Counter1 = Counter1 + 1
        Next
End Function
And try to access in vc++.Then i am getting error

Plz help me

Vi221-Aug-09 3:09

Vi2

21-Aug-09 3:09

Sorry, it requires so much time which I don't have.

Try to call the simpler function, for example,

Public Function Get_List(SheetNumber As Long) As String
    Get_List = "aaa"
End Function

With best wishes,
Vita

MsmVc21-Aug-09 3:23