COM Discussion Boards

ActiveX control container

11-Sep-05 23:30

Hi,

I have tried to show an ActiveX Control on a Window in SDI application. I used the following API,

CLSID clsid; //clsid of activex control
IUnknown* pIunknown;
HRESULT hResult;

hResult = CoCreateInstance( clsid, NULL,
CLSCTX_INPROC_SERVER|CLSCTX_INPROC_HANDLER,
IID_IUnknown, (void**)&pIunknown );

But still the Control is not display.......
Where lies the Error? Can anyone help me out?

-- modified at 5:31 Monday 12th September, 2005

code_chenyf8-Sep-05 14:36

code_chenyf

8-Sep-05 14:36

Friends,
I want to develop a ActiveX control container,and save data in flat(uncompound) document.
My document CxxDoc is derived from COleDocument,and the constructor as following:
CxxDoc::CxxDoc()
{
// EnableCompoundFile();
// ^^^^^^^^^^^^^^^^^^^^^^^^^^I need a flat (uncompound) file.so i delete it.

...
}
Firstly, Is it OK????Can i save data in flat document?

Secondly,my client item is CxxClientItem,
class CxxClientItem : public COleClientItem

The WriteItem and ReadItem function (copied from the sample program of ActiceX control test container in Visual C++) as follows. They can work correctly in compound document. Please tell me how to change them from compound document to flat(uncompound) document. I'm a new and I do need your help. Laugh | :laugh:

void CxxClientItem::WriteItem( CArchive& ar )
{
USES_CONVERSION;
IStoragePtr pStorage;
IStreamPtr pStream;
IPersistStreamInitPtr pPSI;
TCHAR szItemName[64];
HRESULT hResult;
IPersistStoragePtr pPersistStorage;
CxxDoc* pDoc;
CLSID clsid;

(void)ar;

pDoc = GetDocument();
ASSERT_VALID( pDoc );
ASSERT( pDoc->m_lpRootStg != NULL );
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^It is wrong in uncompound document
ASSERT( pDoc->m_bCompoundFile );
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^It is wrong in uncompound document
ASSERT( m_lpStorage != NULL );
ASSERT( !ar.m_bForceFlat );

GetItemName( szItemName );

if( !pDoc->m_bSameAsLoad )
{
hResult = pDoc->m_lpRootStg->CreateStorage( T2COLE( szItemName ),STGM_CREATE|STGM_READWRITE|STGM_TRANSACTED|STGM_SHARE_EXCLUSIVE, 0, 0, &pStorage );
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^It is wrong in uncompound document
if( FAILED( hResult ) )
{
AfxThrowOleException( hResult );
}
m_lpNewStorage = pStorage;
m_lpNewStorage->AddRef();
m_bNeedCommit = TRUE;
}
else
{
pStorage = m_lpStorage;
}

......
}

void CxxClientItem::ReadItem( CArchive& ar )
{
USES_CONVERSION;
BOOL tUsedStream;
IStoragePtr pStorage;
IPersistStreamInitPtr pPSI;
IStreamPtr pStream;
TCHAR szItemName[64];
HRESULT hResult;
BOOL tQuickActivated;
IPersistStoragePtr pPersistStorage;
CLSID clsid;

(void)ar;

CxxDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
ASSERT(pDoc->m_lpRootStg != NULL);
// ^^^^^^^^^^^^^^^^^^^^^^^^^^It is wrong in uncompound document
ASSERT(pDoc->m_bCompoundFile);
// ^^^^^^^^^^^^^^^^^^^^^^^^^^It is wrong in uncompound document
ASSERT(m_lpStorage == NULL);
ASSERT(m_lpLockBytes == NULL);
ASSERT( !ar.m_bForceFlat );

// get item name
GetItemName( szItemName );

// open storage for this item
hResult = pDoc->m_lpRootStg->OpenStorage( T2COLE( szItemName ), NULL,
STGM_READWRITE|STGM_TRANSACTED|STGM_SHARE_EXCLUSIVE, 0, 0, &pStorage );
// ^^^^^^^^^^^^^^^^^^^^^^^^^^It is wrong in uncompound document
if( hResult != S_OK )
{
TRACE1( "Warning: unable to open child storage %s.\n", szItemName );
// upon failure throw file exception (item will be cleaned up)
AfxThrowOleException( hResult );
}
ASSERT(pStorage != NULL);

// remember the storage
m_lpStorage = pStorage;
ASSERT(m_lpStorage != NULL);
m_lpStorage->AddRef();

......
}

Update (Windows)

Illegal Operation8-Sep-05 4:10

Illegal Operation

8-Sep-05 4:10

Can someone please tell me more or less how Microsoft updates your OS over the internet? I know they call API's through ActiveX but how do they do it?

Illegal Operation

Making Computer Software Talk

STA & MTA

MailtoGops8-Sep-05 3:07

MailtoGops

8-Sep-05 3:07

When I am into the STA or MTA threads, how can I check at runtime whether I am STA or MTA thread..

Excel Automation problem

HeartFriend7-Sep-05 20:22

HeartFriend

7-Sep-05 20:22

i'm wonder whether CComPtr<ixxxx> is equal with IXXXPtr(raw interface wrapper class)?
for example:

Excel::_ApplicationPtr spApp;
HRESULT hr = spApp.CreateInstance(L"Excel.Application"); // this will succeed
//CComPtr<Excel::_Application> spApp;
//HRESULT hr = spApp.CoCreateInstance(L"Excel.Application"); //this will fail

i guess in most cases this should be equal ,right?

-- modified at 2:24 Thursday 8th September, 2005

COM and access rights (perhaps ?)

gnilk6-Sep-05 2:17

gnilk

6-Sep-05 2:17

Hi,

I have stumbled upon an issue which I am failing to resolve..
Basically I have an outproc COM server (.exe) which exposes a couple of interfaces which are
bridged to inproc COM objects, .dll's). One of the inproc objects is interfacing with a serial port, this works like a charm with my test application (not using the outproc COM server directly, but instead using the inproc COM objects) but when using the outproc COM server (.exe) as the call-gateway
I am unable to open up the serial ports...

The problem is to open the serial port(s)...
Everything runs on the local machine, administrator accounts, WinXP SP2..

Very "fuzzy" description, however..

|
Application | .exe COM Server - inProc objects <-> serial port
| (not a service)

No impersonation code has been done, everything is most plain (i.e. no tricks applied)
Any ideas ?

// Fredrik

How to properly stop STA thread

ComplexLifeForm3-Sep-05 7:19

ComplexLifeForm

3-Sep-05 7:19

Hi,

I am using a third party COM component to connect to a remote SSH server. For this I have created a STA thread. Now I have a trivial user scenario, when the user issues a connect command a modal dialog is shown with a cancel button to display the status of connection. At anytime the user can press cancel button to abort the operation. Since the calls to cancel/abort are generally asynchronous the actual call to disconnect comes from a different STA thread. Now the problem I am facing is that the after the user clicks the cancel button the dialog is not getting disposed away and the thread is not stopping, thus my application hangs. If I attach a debugger to the release build of the application, the application breaks in the debugger with Invalid RtlHeapAddress. Initially I though it could be a problem of directly accessing my interface pointer, so I marshalled the interface pointer using GlobalInterfaceTable, yet the result is the same.

After some debugging I found that the call to Connect is not returning at all, to be on a safer side I have a message loops in my all STA threads.

How do I make sure that my dialog is disposed properly and my STA thread also stops properly.

I am using VC++ 6.0 for developing my application. The COM part is implemented using pure C++

Thanks

ATL Service

Ashwin kumar Gurujala31-Aug-05 21:42

How to specify a sound card in windows media player

31-Aug-05 21:42

I want to write a service which will notify if any new file is generated in particular directory. How can i trap this event in Atl service

Re: ATL Service

logicaldna31-Aug-05 22:47

logicaldna

31-Aug-05 22:47

plz check

http://www.codeproject.com/file/filemonitor.asp[^]

You will get source and test project for ATL

Excel late binding

Anonymous31-Aug-05 21:21

Anonymous

31-Aug-05 21:21

Hey,
I'm using late binding for Excel and I have problem with calling Open (Workbooks) method.
Some other method (properties) work just fine (I'm using Office XP).

Code:

<br />
objWorkbooks = excel.GetType().InvokeMember("Workbooks",BindingFlags.GetProperty, null, excel, null);<br />
<br />
object[] oParam= new object[13]; //i also try 1(optional) and 11(office 2003) params<br />
oParam[0] = FileName;<br />
for(int t=1; t < parameters.Length; t++)<br />
  oParam[t] = Type.Missing; //a also try to put some valid params (like in early binding)<br />
<br />
//here I get error<br />
objWorkbooks.GetType().InvokeMember("Open",BindingFlags.InvokeMethod, null, objWorkbooks, oParam);<br />
<br />

And exception is: "Additional information: Exception has been thrown by the target of an invocation."

Tnx for helping me.

Nice day,
David

SOAP quetsion

logicaldna31-Aug-05 19:03

logicaldna

31-Aug-05 19:03

plz tell me how to access a dll on a server from a client side VB application

I am able to access ASP service from vb app. through SOAP
but how to do this with .dll

plz help

Thanks in advance

JaniceA29-Aug-05 23:08

JaniceA

29-Aug-05 23:08

I want to specify a sound card for windows media player but keep the windows default sound card unchanged (i.e., windows use another sound card). By the use of DirectSound, I can enumerate all sound cards in my system.

So, after I obtained the GUID of the sound cards, how can I specify a GUID for the windows media player? Also, how can i specify another GUID for the system as its default sound card?

Thanks for your kindness help!!!

-- modified at 5:09 Tuesday 30th August, 2005

Really struggling with GetTypeFromProgID

DaveC42691329-Aug-05 8:11

DaveC426913

29-Aug-05 8:11

Trying to get a VB app to run Windows Media Services on a remote machine.

This code
tServerType = Type.GetTypeFromProgID("WMSServer.Server", <myserver>, True)

generates this error
System.Runtime.InteropServices.COMException (0x800401F3): Invalid class string
at System.RuntimeType.GetTypeFromProgIDImpl(String progID, String server, Boolean throwOnError)
at System.Type.GetTypeFromProgID(String progID, String server, Boolean throwOnError)

I really need help with how to configure my local and my remote machine to talk to each other.

HELP!!

________________________________________________________________________
Dave
Y10K bug! Let's not get caught with our pants down **AGAIN**! (DC 02002)

Jörgen Sigvardsson29-Aug-05 9:00

29-Aug-05 9:00

"WMSServer.Server" is an invalid ProgID. Have you registered the component/proxy locally? (I have no idea how Windows Media Services work, but you mention "remote machine", so I assume you're using DCOM. Then you need to either have the components or the proxy registered on your client machine)

Good music: In my rosary[^]

DaveC42691329-Aug-05 10:03

DaveC426913

29-Aug-05 10:03

I'm pretty green with this stuff.

I am using DCOM, yes.

I am developing on the client machine right now, so I would expect that, yes, they are registered.

"WMSServer.Server" is an invalid ProgID. Should it be the GUID?

________________________________________________________________________
Dave
Y10K bug! Let's not get caught with our pants down **AGAIN**! (DC 02002)

Jörgen Sigvardsson29-Aug-05 19:53

29-Aug-05 19:53

DaveC426913 wrote:
"WMSServer.Server" is an invalid ProgID. Should it be the GUID?

Nah. ProgIDs and CLSIDs (Class ID which is a GUID), are mostly interchangeable. GUIDs are unique, but ProgIDs aren't [edit]necessarily, but are most of the time. (I have yet to encounter two identical ProgIDs for different components!)[/edit]

What the error says is that the component isn't registered on your computer. Not as implementation nor as proxy. You need to investigate further on that.

-- modified at 1:53 Tuesday 30th August, 2005

ActiveX Control's Bitmaps in ToolBox

DaveC42691330-Aug-05 2:59

DaveC426913

30-Aug-05 2:59

"What the error says is that the component isn't registered on your computer. Not as implementation nor as proxy. You need to investigate further on that."

Would that be on the server wherer the service is, or on the client where the app is running?

It's got to be registered somehow - it is already in use when I started developing on these boxes.

________________________________________________________________________
Dave
Y10K bug! Let's not get caught with our pants down **AGAIN**! (DC 02002)

Ashwin kumar Gurujala27-Aug-05 1:53

27-Aug-05 1:53

Hi,
I want to know whether there is any API to show Bitmaps of Registered ActiveX Controls in a ToolBox. If not , any idea on how to go about...

Jörgen Sigvardsson27-Aug-05 13:22

27-Aug-05 13:22

Last time I checked, I could not find one. I used the registry to extract that information.

Good music: In my rosary[^]

Ashwin kumar Gurujala28-Aug-05 19:55

28-Aug-05 19:55

can you just code it in brief on how to show bitmaps from registry.
This is useful to me since i have no idea on how to do it.

Jörgen Sigvardsson29-Aug-05 9:16

29-Aug-05 9:16

The components registry "folder" is located in HKEY_CLASSES_ROOT\CLSID\{<clsid here>}.
Under that key is the ToolboxBitmap32 key. The default value of that key is the toolbox bitmap. The string value is on the form module,id. Parse the module and id into their own variables.

Then open the module using LoadLibraryEx(), using the LOAD_LIBRARY_AS_DATAFILE option. Then use the function LoadBitmap with the handle returned from LoadLibraryEx(), and the id "transformed" with MAKEINTRESOURCE().

Pseudo-code:

LPCTSTR lpszToolboxBitmap32 = GetToolboxBitmap32ForCLSID(clsidOfComponent);
LPCTSTR lpszModule;
int     nId;
ParseBitmapString(lpszToolboxBitmap32, &lpszModule, &nId);
 
HMODULE hLibrary = ::LoadLibraryEx(lpszModule, NULL, LOAD_LIBRARY_AS_DATAFILE);
HBITMAP hBmp = ::LoadBitmap(hLibrary, MAKEINTRESOURCE(nId));
::FreeLibrary(hLibrary);
 
// the handle to your bitmap is now in hBmp

I hope this helps.

Good music: In my rosary[^]

Ashwin kumar Gurujala1-Sep-05 1:37