Name of Component Servers - COM Discussion Boards

Vi217-Jul-03 18:03

17-Jul-03 18:03

With [helpstring] of the library statement of IDL(ODL). When I make such change, I will see it in VB project.

Hm... I see that the VB saves the name in own project. It needs for the showing of missing references. Though the VB rechanges these names before saving or opening the project.

With best wishes,
Vita

Re: Display name of components

Mil1017-Jul-03 18:47

Mil10

17-Jul-03 18:47

Hi,
What Victor mentioned is correct. Modifying the helpstring in IDL/ODL, will reflect in the tlb listing dlg. If you are not getting it, might be somthiing else is wrong.

best wishes..mil10

IMAPI Sample Code

Martin Hinchy16-Jul-03 15:49

Martin Hinchy

16-Jul-03 15:49

Does anyone have a small C++ example on how to use the Image Mastering API (IMAPI) in Windows XP?

In what file does the type library appear in? There is an executable called imapi.exe in the System32 directory but it does not contain the type library.

Regards
Martin

Lose focus by using CoCreateInstance

16-Jul-03 15:14

Hi,

When I use the following code to create an instance of Internet Explorer, the top window seems to lose focus.

HWND hForegroundWindow = GetForegroundWindow();

CLSIDFromProgID(OLESTR("InternetExplorer.Application"), &clsid);
CoCreateInstance(clsid, NULL, CLSCTX_SERVER, IID_IUnknown, (LPVOID*)&pUnk);

pUnk->QueryInterface(IID_IWebBrowser2, (LPVOID*)&pWB);
pUnk->Release();

SetForegroundWindow(hForegroundWindow);

When CoCreateInstance function is called, the top window loses it focus, and invisible IE seems to receive the focus.
I get the handle to the foreground window and set it back after CoCreateInstance is called. However, i still do lose focus in that couple seconds. This is particularly annonying when i am tying something. Because when the top window loses its focus, the input will stop. Is there anyway to make it so that when CoCreateInstance is called, the foreground will still keep the focus?

Thanks

Accessing Outlook Express

Brigg Thorp16-Jul-03 9:57

Brigg Thorp

16-Jul-03 9:57

Hey everyone...

I have been trying to find some documentation on how to access contact (name, e-mail, phone, anniversary, etc.) info within Outlook Express. I am currently able to get at data using a typelib for Outlook 2000 and XP, but alas, it doesn't work with Outlook Express.

Does anyone know if there is a typelib avaialble, or if there is some documentation somewhere that would help me get started?

Thanks...

Brigg Thorp
Software Engineer
Timex Corporation

Re: Accessing Outlook Express

Amit Dey18-Jul-03 9:34

Amit Dey

18-Jul-03 9:34

Hello Brigg,

Well, you are certainly asking in the right forum. I'm assuming you know COM programming. Smile | :)

you would need it to use my sdk.

What you are looking to do with Outlook Express is possible through 'undocumented' means. Please checkout my messageboard here. I'm working on a future CP article on this, but as of now, it's not meant for public distrib.

Cheers,

Hush,hush...
thought I heard you call my name now.

Kula Shaker.

Amit Dey
Latest articles at CP -
Writing Word addins
Office addin

Re: Accessing Outlook Express

Brigg Thorp25-Jul-03 9:45

Brigg Thorp

25-Jul-03 9:45

Amit,

Actually, I'm not that familiar with COM. I've been using a TypeLib with Outlook 2000 and XP, so it's pretty much just accessing member functions and variables within the MSO class.

Could you possibly point me to the "undocumented" means of accessing this data? I would like to take a look at how this is done.

Thanks...

Brigg Thorp
Software Engineer
Timex Corporation

Name of Component Servers

first_sandy16-Jul-03 3:15

first_sandy

16-Jul-03 3:15

Hi,
Can any help me how can i change the display name of a component.
Like in ODL file i have syntax as
...
[ uuid(), version(1.0) ]
library MyLibrary
{
...

But i want to display this component as "iZ ImageTool 1.0".
Can any one help me to find the MIDL syntax to support names other than the libname.
thanks!

COM handle leaks?

Wayne Hutchinson15-Jul-03 7:53

Wayne Hutchinson

15-Jul-03 7:53

I have observed a handle leak in a COM object which acts as both a COM client and a server. This object is responsible for starting and stopping other COM objects.

In an attempt to find the handle leak, I've written an extremely simple COM object (exe) that implements a very simple interface. I also have client code that creates the COM object, calls a method on the interface and releases the interface pointer. These steps are repeated a number of times. After releasing the object, the client pauses long enough to ensure that the server dies and goes away.

Using Task Manager, I watch the client's handle count increment by one each pass through the loop.

I'm looking for clues - anyone know where the handle leak occurs?

By the way, I also tried a client using smart pointers and observed identical results in terms of leaking handles.

Here's the client code:

ILeak *pLeak;
CLSID clsid;

CoInitialize(NULL);

CLSIDFromProgID(L"Atlsvr.Leak", &clsid);
for (int i=0; i<10; i++) {
CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER, IID_ILeak, (void**)&pLeak);
pLeak->Add();
pLeak->Release();
Sleep(5000);
}

CoUninitialize();

Wayne

Re: COM handle leaks?

Peter Weyzen17-Jul-03 18:30

Peter Weyzen

17-Jul-03 18:30

What does pLeak->Add() do? Is it adding a reference count to the object? If so, then your object never gets released....

I am by no means a COM expert, but I would assume that the CoCreateInstance init's the object with at least 1 reference on it. And at that point, the Release just brings the reference count back down to where it was created.....

Just a thought -- no expert here. It's been years since I did any COM, last one was doing OLE2 client/server stuff in the late 90s.

-p

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

Re: COM handle leaks?

Wayne Hutchinson18-Jul-03 7:30

Wayne Hutchinson

18-Jul-03 7:30

In this case the poorly named Add method simply returns S_OK, so the reference count isn't affected.

By the way, I did discover that by moving the CoInitialize() and CoUninitialize() inside the loop, the handle leak goes away. At this point, I'm not sure that's feasible in the code I'm working on, so I'm still interested in finding another solution to eliminating the handle leak.

Wayne

Download ActiveX

Anonymous15-Jul-03 5:36

Anonymous

15-Jul-03 5:36

Hi,
does anybody know how to download ActiveX from Apache Server and not from IIS. What should be the HTML Script and where should I put the ActiveX (dll) on Apache Server.
thanks

Re: Download ActiveX

Anonymous15-Jul-03 5:49

Anonymous

15-Jul-03 5:49

thanks I found the problem

Location transparency

In-At14-Jul-03 20:02

In-At

14-Jul-03 20:02

Hi,

Please suggest regarding following trouble:

Create a COM component "InProcVB.dll" as in-proc DLL in VB exposing some interfaces and methods .

Write its client as "clientVB".

Write another COM component as "OutOfProc.exe" as out-of-proc exe server in VC. This has same

interface/class/InterfaceIDs/ClassIDs as that of "InProcVB.dll". This is written with purpose of

replacing "InProcVB.dll". And, the expectation is that client need not re-compile. (As defined by

rule "Location transparency of COM).

After developing "OutOfProc.exe", we unregistered "InProcVB.dll", and registered "OutOfProc.exe".

Executed "clientVB" without any change. It gave error type-mismatch. The error point was:

Dim objSrvClass as SrvClass

set SrvClass = CreateObject("Server.Class") --> Problem: Type mismatch.

If I change code as

Dim objSrvClass as Object

set SrvClass = CreateObject("Server.Class")

It works well.

Please suggest.

How to programmatically set the "Minutes until idle shutdown:" value in the Advanced Tab?

ckatili14-Jul-03 11:00

ckatili

14-Jul-03 11:00

Hi there,

Anybody knows how to programmatically set the "Minutes until idle shutdown:" value in the Advanced Tab?

Ideas or link is highly appreciated.

CK

"Computers are like Old Testament gods; lots of rules and no mercy." -JosephCampbell

Direct Music

Mad Docs Hairy Belly11-Jul-03 10:11

Mad Docs Hairy Belly

11-Jul-03 10:11

Anyone know where theres some good info on the audio side of DirectX?

I've read and understood most of the stuff that comes with the SDK, but are there any tutorials on using DirectX in say an audio sequencer?

Ta

Re: Direct Music

Hadi Rezaee12-Jul-03 10:57

Hadi Rezaee

12-Jul-03 10:57

Hello,
Check out http://www.gamedev.net/[^]
Regards,

Uninstalling a COM component/server

Anonymous11-Jul-03 8:18

Anonymous

11-Jul-03 8:18

I've created a COM component and now I want to install it. I've wrapped it up in an installable package using InstallShield. I can then choose to uninstall it using the Add/Remove software utility. If I want to uninstall it from another I write some code to unregister it like this:

HINSTANCE hModule = LoadLibraryA(szModuleFilename);
HRESULT (STDAPICALLTYPE	*pfn)(void);
(FARPROC&)pfn = GetProcAddress(hModule, "DllUnregisterServer");

I can then delete the DLL and it's containing folder but that's not really satisfactory is it?

What's the best way of doing it? I guess there must be a way of emulating the call to the Add/Remove utility and I guess this is probably the best method. Anyone know how or have an opinion?

Re: Uninstalling a COM component/server

valikac12-Jul-03 5:05

valikac

12-Jul-03 5:05

One solution is to run regsvr32.

Kuphryn

Re: Uninstalling a COM component/server

Anonymous12-Jul-03 13:07

Anonymous

12-Jul-03 13:07

That's just the same as calling the code that unregisters the DLL - it doesn't uninstall the package. Say I had installed my COM server using InstallShield which had also created some registry entries, simply calling regsvr32 or the code above would result in the COM component being no longer registered but the registry entries would still exist and anything else that had been installed as part of the package like the containing folder etc.

HOW TO IMPORT A TAB DELIMITED TEXT FILE INTO AN ACCESS DATABSE PROGRAMMATICALLY?

vcseeker9-Jul-03 23:13

vcseeker

9-Jul-03 23:13

Hi ,
I am searching for a good sample code or article that takes a tab delimited file as input and imports it prograamatically in an access database.I don't want to loop through all the records in the text file and then put them individually into access.I want to import the whole file programmatically into an MS ACCESS table.May be it requires OLE.
Any help will be appriciated.
Thanks and regards.

Re: HOW TO IMPORT A TAB DELIMITED TEXT FILE INTO AN ACCESS DATABSE PROGRAMMATICALLY?

Mil1013-Jul-03 18:28

Mil10

13-Jul-03 18:28

Hi,

BUlk insertion is not possible in MS Access, but u can do it in Sql Server, just chk out the documentation of BULK INSERT in MSDN, and use _ConnectionPtr to connect to datasource using ADO.

best wishes..mil10

COM/ATL trying to write a new interface, getting error base class undefined

yoshibebe9-Jul-03 8:19

yoshibebe

9-Jul-03 8:19

I've been trying to add a new interface to my application, and for some reason, I keep getting the following error:

C2504: IWWAlmDBAck : base class undefined

I defined a new interface in an IDL file, and IWWAlmDBAck is using IUnknown.

I declare the interface in a header file, underneath a class called CWWAlmDBPrg, declaring it as public IWWAlmDBAck.

The error is pointing to the header file, saying that the base class is undefined. However, there are old interfaces defined under CWWAlmDBPrg, and no errors generated from that. Why is it when I add a new one, the error occur?

Below is my header code:

This is where I got the error, at IWWAlmDBACK

class CWWAlmDBPrg :
public IWWAlmDBConnection,
public IWWAlmDBInfo,
public IWWAlmDBTable,
public IWWAlmDBProviderSession,
public IWWAlmDBQuery,
public IWWAlmDBDetailed,
public IWWAlmDBConsolidated,
public IWWAlmDBCause,
public IWWAlmDBComment,
public IWWAlmDBDefaultQuery,
public IWWAlmDBTagStatus,
public IWWAlmDBEvents,
public IWWAlmDBErrorInfo,

//New Interface:
public IWWAlmDBACK,

public CComObjectRoot,
public CComCoClass<cwwalmdbprg,&clsid_wwalmdbprg>
{
public:
CWWAlmDBPrg()

Below is code from my IDL:

This is where I defined the interface IWWAlmDBACK:

//New
[
object,
uuid(2D65B748-6B53-45e5-A201-74D072F39045),
helpstring("IWWAlmDBACK Interface"),
pointer_default(unique)
]
interface IWWAlmDBACK : IUnknown
{
[helpstring("method LogAlmAckConsolidated")] HRESULT LogAlmAckConsolidated([in] int AlarmId,[in,string] wchar_t* AckTime,[in] int AckTimeFracSec,[in] int AckTimeZoneOffset,[in] int AckDaylightAdjustment,[in] int OutstandingAcks,[in] int AckCommentId, [in,string] wchar_t* AckOperatorName,[in,string] wchar_t* AckNodeName, [in] double User1, [in] double User2, [in,string]wchar_t* User3, [in] long Cookie);
};
//End New

I generated the uuid using guidgen.exe

I defined the interface in coclass:

coclass WWAlmDBPrg
{
[default] interface IWWAlmDBConnection;
interface IWWAlmDBInfo;
interface IWWAlmDBTable;
interface IWWAlmDBProviderSession;
interface IWWAlmDBQuery;
interface IWWAlmDBDetailed;
interface IWWAlmDBConsolidated;
interface IWWAlmDBCause;
interface IWWAlmDBComment;
interface IWWAlmDBDefaultQuery;
interface IWWAlmDBTagStatus;
interface IWWAlmDBEvents;
interface IWWAlmDBErrorInfo;

//New
interface IWWAlmDBACK;

};

Thank you!

Re: COM/ATL trying to write a new interface, getting error base class undefined

Heath Stewart10-Jul-03 3:56

Heath Stewart

10-Jul-03 3:56

The only thing I can think of is to make sure the interface is defined before it is used (i.e., defined before CWWAlmDBPrg) and that the header is included in the source file in which its used. Also, perhaps recompiling the IDL file before building the project would help. I had a similar problem once where the IDL file wasn't getting compiled automatically during the build, and I had to manually do it before the build process.

Reminiscent of my younger years...

LOAD "SCISSORS"

RUN

Accessing images trough IHTMLDocument2

SysLo7-Jul-03 22:36

SysLo

7-Jul-03 22:36

Hi,

The IHTMLDocument2 interface has the method get_images(), which supposedly returns the images found in the document. But trough that interface I can only access the attributes concerning the images (e.g. height, width, border etc.).

So my question can I access the actual image data from somewhere. From IHTMLDocument2 or from some other related interface. I'm developing an ActiveX component which needs to alter images on pages.

"There is no reason for any individuals to have a computer in their home". Ken Olson, president and founder of Digital Equipment Corp.

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