COM Discussion Boards

Re: Really basic Automation question

23-Jul-07 5:28

I am not too sure about this, but you can implement a solution using an extra AddRef-Release from withing Document

Sohail

modified 21-Apr-21 21:01pm.

Roger Broomfield2-Aug-07 21:22

Roger Broomfield

2-Aug-07 21:22

It depends on the Application you are automating.
For example automating Word you just call word_application.SetVisible(TRUE) but for Excel you should call excel_application.SetVisible(TRUE) followed by excel_application.SetUserControl(TRUE) and of course dont call Close() on the document.

Accessing COM component from JScript

PriyaJ.220622-Jul-07 23:36

22-Jul-07 23:36

I have a COM component. I want to access the component through a HTML file. I'm trying to create COM object using Java Script. Can anyone tell me how to do this?

Thanks,
Priya

User 21559723-Jul-07 0:53

23-Jul-07 0:53

Does XMLHttp Example[^] help?

Sohail

modified 21-Apr-21 21:01pm.

PriyaJ.220623-Jul-07 2:01

23-Jul-07 2:01

Thanks Sohail.But still i'm able to access a function within the script. To access a component method i need to create a com object in the script. How should i go about creating a COM object?

User 21559723-Jul-07 5:22

23-Jul-07 5:22

The link I provided has a sample JavaScript code to create XMLHttp object and call its methods.

Following is the syntax of creating XMLHttp object
var xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")

where "Microsoft.XMLHTTP" is the version independent ProgId of XMLHttp COM Component.

In your case, replace "Microsoft.XMLHTTP" with your components ProgId.

The above said, is example of creating COM objects in IE. For Mozilla refer the same link and the example.

Sohail

modified 21-Apr-21 21:01pm.

PriyaJ.220623-Jul-07 17:16

23-Jul-07 17:16

Ya I have tried doing this, but when I create an ActiveXObject it throws an error which says "Automation server can't create object", when I searched through the net I got to know enabling "Initialize and script activeX controls not marked as safe" in IE solves this error. But after enabling this I'm getting a Undefined error. This made me think there should be some other way of creating my com object. When I try creating a wscript.shell object it works fine. I get a problem only when i try creating my COM object.
Priya

User 21559723-Jul-07 18:00

23-Jul-07 18:00

PriyaJ.2206 wrote:
"Initialize and script activeX controls not marked as safe" in IE solves this error

Yes, I read about this.

PriyaJ.2206 wrote:
But after enabling this I'm getting a Undefined error.

What is the error number and description? Do you get undefined error when creating object or calling its method?

Sohail

modified 21-Apr-21 21:01pm.

PriyaJ.220623-Jul-07 19:08

23-Jul-07 19:08

Its IE script error dialog, it shows line number, code no. as 0, error as "Unspecified error". The line number which is shows in the line at which object is created ie. var obj = new ActiveXObject("MyComponent.MyComponentObj").
Error occurs at creating object line.

Priya

User 21559723-Jul-07 19:57

23-Jul-07 19:57

What version of IE are you using?

Sohail

modified 21-Apr-21 21:01pm.

PriyaJ.220623-Jul-07 19:58

23-Jul-07 19:58

IE6

Priya

User 21559723-Jul-07 21:01

23-Jul-07 21:01

Does the following sample work in your browser (It works fine on my IE6 browser)

<html><br />
<head><br />
<script type="text/javascript"><br />
var xmlhttp;<br />
<br />
function testXMLHttp()<br />
{<br />
xmlhttp=null<br />
// code for Mozilla, etc.<br />
if (window.XMLHttpRequest)<br />
  {<br />
  xmlhttp=new XMLHttpRequest()<br />
  }<br />
// code for IE<br />
else if (window.ActiveXObject)<br />
  {<br />
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")<br />
  }<br />
if (xmlhttp!=null)<br />
  {<br />
  alert("Your browser does support XMLHTTP.")<br />
  }<br />
else<br />
  {<br />
  alert("Your browser does not support XMLHTTP.")<br />
  }<br />
}<br />
</script><br />
</head><br />
<body onload="testXMLHttp()"><br />
<br />
</body><br />
</html>

Sohail

modified 21-Apr-21 21:01pm.

PriyaJ.220623-Jul-07 21:08

23-Jul-07 21:08

Thanks Sohail,
Actually when i was trying to fix it up, I came to know that the problem is only when accessing my component. I tried creating another simple component and accessed it by creating object through ActiveXObject, it works fine.

I'm creating a CAxWindow object and embedding the html content into a toolbar using CAxWindow's create control method. Now I doubt whether creating a CAxWindow causes the actual problem.

Priya

User 21559723-Jul-07 21:16

Pass user defined type array

23-Jul-07 21:16

PriyaJ.2206 wrote:
Actually when i was trying to fix it up, I came to know that the problem is only when accessing my component. I tried creating another simple component and accessed it by creating object through ActiveXObject, it works fine.

Good.

Sohail

modified 21-Apr-21 21:01pm.

scheewie20-Jul-07 3:23

scheewie

20-Jul-07 3:23

Hi,

I'm trying to get a c# server component to pass a user defined type array to a VB6 client component through COM+. Is this possible with early binding?

I have created a c# component that works fine in COM (it passes bool, int etc). But when I try to pass a user defined type array, the array received in VB6 is empty (0 items), even tough I force the c# component to return at least one item in the array.

Heres my code:
C# function:
public MyType[] MyTypes()
{
MyType[] mt = {new MyType()};

return mt;
}

VB6 call:
Dim tool as MySpace.Tools
Dim retVal() as MySpace.MyType
Set tool = new MySpace.Tools

retVal = tool.MyTypes

Output UBound retVal gives 0 items.

Can't I pass arrays like this between C# and VB6 in COM+?
What is the solution to my problem?

Thanks in advance!

BR
Øivind

Re: Pass user defined type array

sthotakura23-Jul-07 8:02

sthotakura

23-Jul-07 8:02

try return them as Object s

Cheers,
Suresh

How to include header file "Gdiplus.h" in IDL file

Bidesh Mukherjee18-Jul-07 21:26

Bidesh Mukherjee

18-Jul-07 21:26

Hi all,

I have static lib which i want to convert into COM DLL. so have write an IDL file.
In this IDL file i have to define a structure which contains another structure COLOR which is defined in "Gdiplus.h".

My question is whether i can add this header file "Gdiplus.h" in the IDL file?
If yes then how. note that after including the "Gdiplus.h" i have mention its namespace also which is Gdiplus.

I have done it by including #import "Gdiplus.h" but error such as this is generated

C:\Program Files\Microsoft Platform SDK for Windows Server 2003 R2\Include\Gdiplus.h(25) : error MIDL2025 : syntax error : expecting an interface name or DispatchInterfaceName or CoclassName or ModuleName or LibraryName or a type specification near "namespace"

The IDL file for your reference...

//----------------------------------------------------------------------------
// File: Control.idl
//
// Desc: Interface definition for the IControl
//
//----------------------------------------------------------------------------

import "oaidl.idl";
import "ocidl.idl";
import "Gdiplus.h";
using namespace Gdiplus;

cpp_quote("// Structure containing the various color details of the meter display")
typedef struct _ColorInfo
{
Color NeedlePointerColor;
Color NeedleJointColor;
//Color TextColor;
COLORREF TextColor;
Color LargeGridColor;
Color SmallGridColor;
Color BackGroundColor;

// Constructor
_ColorInfo()
{
NeedlePointerColor = Color(255,163, 163, 163);
NeedleJointColor = Color(255,255, 255, 0);
//TextColor = Color(255,255, 255, 255);
TextColor = RGB(255, 255, 255);
LargeGridColor = Color(255,255, 255, 255);
SmallGridColor = Color(255,255, 255, 255);
BackGroundColor = Color(255, 0, 0, 0);
}

// Copy Constructor
_ColorInfo(const _ColorInfo &ColorInfo)
{
NeedlePointerColor = ColorInfo.NeedlePointerColor;
NeedleJointColor = ColorInfo.NeedleJointColor;
TextColor = ColorInfo.TextColor;
LargeGridColor = ColorInfo.LargeGridColor;
SmallGridColor = ColorInfo.SmallGridColor;
BackGroundColor = ColorInfo.BackGroundColor;
}

// Assignment operator overloading
_ColorInfo & operator = (const _ColorInfo &ColorInfo)
{
NeedlePointerColor = ColorInfo.NeedlePointerColor;
NeedleJointColor = ColorInfo.NeedleJointColor;
TextColor = ColorInfo.TextColor;
LargeGridColor = ColorInfo.LargeGridColor;
SmallGridColor = ColorInfo.SmallGridColor;
BackGroundColor = ColorInfo.BackGroundColor;
return *this;
}
} COLORINFO;

//-------------------------------------------------------------------------
// IControl Interface Confused | :confused:

// Desc: Exposes initialization method for the Control dll
//-------------------------------------------------------------------------
[
object,
uuid(5BC8F091-28C0-42aa-AD10-AA78E612D6AA),
version(1.0),
helpstring("IControl Interface"),
pointer_default(unique)
]

interface IControl : IUnknown
{
cpp_quote("// Displays the control")
[id(2), helpstring("method ShowControl")]
HRESULT ShowControl( );
}

//{5E3CE754-FCC9-454e-B4BE-D1DD470BAF1E}
//{ 0x5e3ce754, 0xfcc9, 0x454e, { 0xb4, 0xbe, 0xd1, 0xdd, 0x47, 0xb, 0xaf, 0x1e } };
[
uuid(5E3CE754-FCC9-454e-B4BE-D1DD470BAF1E),
helpstring("Meter Class")
]
coclass Meter
{
[default] interface IControl;
};

Can anyone help me.

Thanks,
Bidesh

Re: How to include header file "Gdiplus.h" in IDL file

User 21559719-Jul-07 20:44

which coclass in C# COM server is initialized?

19-Jul-07 20:44

MIDL keyword Include[^]may help.

Sohail

modified 21-Apr-21 21:01pm.

George_George17-Jul-07 21:26

George_George

17-Jul-07 21:26

Hello everyone,

I am writing C# COM server (managed code). Since there is no QueryInterface, DllGetClassObject like in C++ native code, I am wondering how to know which coclass is initialized and which method is invoking by client?

I have such question is because I only develop COM server, and there are some dll level error (dll no longer available, something like this), so I think COM client may use some coclass/methods which my COM server does not support. But I do not have COM client source codes, so I am wondering how to get the information (which coclass/method client is using).

thanks in advance,
George

returning array of BSTRs from the COM component

Raj Prathap17-Jul-07 2:25

Raj Prathap

17-Jul-07 2:25

Hi,
I have a method which has to return the array of BSTRs. I'm giving the method here, please let me know if I'm doing anything wrong.

<br />
HRESULT Login([in] BSTR UserName, [in] BSTR Password, int maxUsrCnt , [out]int *UsrCnt, [out, length_is(,*UsrCnt), size_is(,maxUsrCnt)] BSTR *LoggedUsers);<br />

the size of the array to be returned is not known at the time of calling.
When I use this method, the first string is coming properly, but other strings are not coming.

Please suggest an answer.

Regards,
Raja Pratap

Re: returning array of BSTRs from the COM component

Mike Dimmick17-Jul-07 2:52

Mike Dimmick

17-Jul-07 2:52

I'd avoid trying to mix BSTRs and custom marshalling. Instead, I'd go with a SAFEARRAY of BSTR. To return such an array to a VB client, I'm using:

HRESULT ExtendedHardwareType([out, retval] SAFEARRAY(BSTR)* psArray);

Stability. What an interesting concept. -- Chris Maunder

Re: returning array of BSTRs from the COM component

Raj Prathap18-Jul-07 20:20

Raj Prathap

18-Jul-07 20:20

Thanks a ton Mike, working and its very easy to code.

Unable to Start Exchange service

Ashish Vasudev16-Jul-07 23:09

Ashish Vasudev

16-Jul-07 23:09

I am using Microsoft Exchange 2003 to replicate mails and folders. but i am not able to replicate folders in exchange through my code. while looking at at the services, i found that the service named Microsoft Exchange Event is not started except the other services. On starting the service manually i get the message "Services Stop automatically if they do not have any work to do".

Ashish Vasudev

Apartment (STA) mode before OLE calls

MadmanWoo16-Jul-07 21:03

MadmanWoo

16-Jul-07 21:03

Hi all,

I have a VB.NET program that has a OLE COM object imbedded in the form, the OLE object can send information back to my program by using callback which is set up as a class.

In the Callback class I have a sub set up to handle every time the OLE window changes which works fine, now the fun begins. I set up another sub which takes a string from the sub receiving the callback message, it then uses this string to select a control on the main form like so

Dim pnl as Panel = Mainform.pnlLegend.Controls.Item({String})

When ever it gets to this line it throws the error "Current thread must be set to single thread apartment (STA) mode before OLE calls can be made".

I have searched all over the net looking but the only help I can find on this is stuff to do with remote clipboards. Hopefully someone on here maybe able to help me with this.

Thanks
Nathan

Re: Apartment (STA) mode before OLE calls

User 21559716-Jul-07 22:58