C / C++ / MFC

Re: Disable/Enable OK on propertysheet

8-Jan-02 5:45

You can get hold of a CWnd * to the OK button with GetDlgItem(IDOK) (if inside a method of the property sheet) or GetParent()->GetDlgItem(IDOK) (from a method of a child property page). Then you can call CWnd::EnableWindow for that pointer.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Ken Goguen8-Jan-02 6:49

Ken Goguen

8-Jan-02 6:49

Thanks.

-kg

Ken Goguen

Safearray of UDT

Krouer8-Jan-02 3:00

8-Jan-02 3:00

I have an automation interface which own a UDT array. The UDT is define as
struct NoteDesc {
float base;
float pitch;
float medium;
};

In my interface, I have set the get and put properties. put works really great but after I return from get, I have memory crash in the kernel.

Here my interface def:
[
object,
uuid(60C22F90-D3BB-4BA0-ABCC-837E4CA2AEF2),
dual,
helpstring("IScoreDesc Interface"),
pointer_default(unique)
]
interface IScoreDesc : IDispatch
{
[propget, id(1)] HRESULT NumberOfNote([out, retval] long *pVal);
[propput, id(1)] HRESULT NumberOfNote([in] long newVal);
[propget, id(2)] HRESULT Notes([out, retval] SAFEARRAY(NoteDesc) *pVal);
[propput, id(2)] HRESULT Notes([in] SAFEARRAY(NoteDesc) newVal);
};

and the class compil well, the call to get is effective. The problem occur when I return of the function get define like that in my h file:
STDMETHOD(get_Notes)(SAFEARRAY* *pVal);

Do you have any idea?

Joaquín M López Muñoz8-Jan-02 3:10

8-Jan-02 3:10

It'd be most helpful if you could post the actual implementation of your get_Notes function. Anything else seems to be OK.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Krouer8-Jan-02 3:49

8-Jan-02 3:49

The source code of my function: (my comment are in french, don't take care of them)

STDMETHODIMP CScoreDesc::get_Notes(SAFEARRAY **pVal)
{
// Remplis une structure d'information pour pouvoir créer le tableau
IRecordInfo* pRecordInfo = NULL;
HRESULT hr = GetRecordInfoFromGuids(LIBID_MUSICSEARCHSYSTEM, 1, 0, GetUserDefaultLCID(), IID_NodeDesc, &pRecordInfo);
// Détruit le tableau si il existait déjà
if (*pVal != NULL)
{
SafeArrayDestroy(*pVal);
*pVal = NULL;
}
// Crée un tableau pour le transport
*pVal = SafeArrayCreateVectorEx(VT_RECORD, 0, m_NumberOfNote, pRecordInfo);
pRecordInfo->Release();
if (*pVal == NULL)
{
hr = Error(_T("Cannot create the Notes decription array"));
return hr;
}

// Rempli le tableau avec le contenu du tableau interne
NoteDesc* pNoteArray;
hr = SafeArrayAccessData(*pVal, (void**) &pNoteArray);
if FAILED(hr) return hr;
memcpy(pNoteArray, m_Notes, sizeof(NoteDesc)*m_NumberOfNote);
SafeArrayUnaccessData(*pVal);

return S_OK;
}

The IID_NoteDesc is defined at the top of this cpp file.

I have try to follow an article I found on this site write by Ioannis Stamatopoulos.

Thanks,
Bruno

Joaquín M López Muñoz8-Jan-02 4:20

8-Jan-02 4:20

The only thing I can guess about your code is that maybe sizeof(NoteDesc) is not equal to the value provided by pRecordInfo->GetSize() due to alignment considerations. Could you check that out?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Krouer8-Jan-02 4:48

8-Jan-02 4:48

The error message:
HEAP[musicserver.exe]: Invalid Address specified to RtlFreeHeap( 130000, 1e0690 )

The size return pRecordInfo->GetSize and sizeof(NoteDesc) are identical (value is 12 - 3 32bits floats)

I don't know where it found to have to destroy this huge part of memory.

My test array contains only 10 elements, that's 120 bytes. Not 722576 if I have understand correctly the trace from the HEAP.

Thanks,
Bruno

Joaquín M López Muñoz8-Jan-02 5:31

8-Jan-02 5:31

Well, this is wild guessing, but anyway... What client technology are you using? If it's ASP or other VB-based stuff, seems like VBSCRIPT does not handle SAFEARRAYs of objects other than VARIANTs (read MSDN article PRB: Script Error Occurs When Referencing Non-variant Array (Q165967)). Also, if your client is written in C#, I've read several posts on the Usenet about an alleged bug of the .NET platform that shows when dealing with SAFEARRAYs created via SafeArrayCreateVector(Ex) --this is far from confirmed, though.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Krouer8-Jan-02 5:36

8-Jan-02 5:36

Client are currently in C++ (Console test app and ActiveX)

I will give a try with SafeArrayCreateEx instead of SafeArrayCreateVectorEx. Perhaps, they have a bug with that last function.

Many thanks Joaquin for your help,

Thanks,
Bruno

Joaquín M López Muñoz8-Jan-02 5:48

8-Jan-02 5:48

Sorry I haven't been more helpful. Bonne chance!

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Krouer8-Jan-02 5:58

8-Jan-02 5:58

Joaquín M López Muñoz wrote:
Sorry I haven't been more helpful. Bonne chance!
Don't be sorry. You have find the solution.

I replace the SafeArrayCreateVectorEx by a SafeArrayCreateEx and it works perfectly.

Gracias y buenas tardes,
Bruno

Joaquín M López Muñoz8-Jan-02 6:00

8-Jan-02 6:00

!!

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

How to skip a bad disk sector

Ernest Laurentin8-Jan-02 5:59

Ernest Laurentin

8-Jan-02 5:59

Try to declare the get property like this:

[propget, id(2)] HRESULT Notes([in,out] SAFEARRAY(NoteDesc) *pVal);

Define your UDT like this:
Describing UDT in the IDL file

library ScoreDesc
{
   // replace "C1D3A8C0-A4AA-11D0-819C-00A0C90FFFC3" by the correct one in your project
   typedef [uuid(C1D3A8C0-A4AA-11D0-819C-00A0C90FFFC3)] struct_NoteDesc{
      float base;
      float pitch;
      float medium
   } NoteDesc;

or Take a look Passing UDT at MSDN

- God bless the World

ly602698-Jan-02 2:42

ly60269

8-Jan-02 2:42

A general disk exception was detected when open a new file. It is caused by a bad disk sector. How to skip the bad sector so that fileopen and fwrite can be continued?

The software is developed with VC 6.0 on Win2k

Thanks a lot.

Re: How to skip a bad disk sector

James R. Twine8-Jan-02 7:34

James R. Twine

8-Jan-02 7:34

I am not sure how easy that would be to do in code, but I would just suggest running ChkDsk, and letting it map around the bad sector.

Peace!

-=- James.

Display parent member variable

8-Jan-02 1:25

Hi There,
I'm developing a dialog based application. As Application starts it shows some data in editbox. I wanted to create one more dialogbox from here which display selected substring in the EditBox from my main dialogbox. An example of this is when you press Ctrl+F in wordpad and you have some selected string in opened document then Find-box display that string as it shown up

Thanks for taking time to write in.

-- Sumit
Please make a CC to me sumit@elitecore.com.

Re: Display parent member variable

Joaquín M López Muñoz8-Jan-02 2:06

XP, Word 2002, Automation closes my APP !!!

8-Jan-02 2:06

If it is retrieving the selected text what you're having difficulties with, take a look at CEdit:GetSel.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Braulio Dez8-Jan-02 0:06

Braulio Dez

8-Jan-02 0:06

Hi,

I´m testing my application in several platforms, I report mode I use Word in a view and with automation I create my reports...

The problem that I have is that I´m trying to use that with XP ( and office 2002), and when I close the word window, then the whole application is closed, do you now if something has been change and makes it not work right with the good old MFC...

Thanks, Bye !
Braulio

How set cursor for CRectTracker

Eugene Pustovoyt7-Jan-02 23:39

Eugene Pustovoyt

7-Jan-02 23:39

Hello everybody!

I have the object CRectTracker m_tracker in my Modal Dialog and I need set the cursor for him.
But this code not work (cursor is invisible). Why?

BOOL CMyDialog::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
   if (pWnd == this && m_tracker.SetCursor(this, nHitTest))
       return TRUE;
   return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

Best regrads,
Eugene Pustovoyt

Sonork ID 100.10002:Yaumen

Re: How set cursor for CRectTracker

Joaquín M López Muñoz8-Jan-02 2:34

Re: How set cursor for CRectTracker

8-Jan-02 2:34

Hi Eugene, maybe your CRectTracker is not being able to load the cursors, as it seems to be the case under some circumstances when you statically link to MFC: try selecting the shared DLL version of MFC --if I'm right then the cursors should now show.
If this is indeed the problem, take a look at MSDN article BUG: BLOCKS32 Sample Fails to Show Cursors when Linked to MFC (Q208856) which describes a program having the same problem and a way to solve it.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Eugene Pustovoyt8-Jan-02 20:20

Eugene Pustovoyt

8-Jan-02 20:20

Many thanks for the help!
All and was, as you have written.

Has already corrected also all has earned!!!

Best regards,
Eugene Pustovoyt
Big Grin | :-D

Sonork ID 100.10002:Yaumen

Why using BOOL over bool (or not)

EiSl7-Jan-02 21:56

EiSl

7-Jan-02 21:56

Hello all,

I was just wondering about the typical difference in usage between type BOOL and bool. Within the Windows environment, the BOOL is an unsigned integer. When using data-structures you find the bool used iso BOOL, which is put inside a kind of bit-array by the compiler. This is of course logical due memory usage, since the BOOL takes in Win32 4 bytes.

Is there any reason to use the BOOL over the bool type definition?

Thanks in advance,

EiSl

Re: Why using BOOL over bool (or not)

Joaquín M López Muñoz7-Jan-02 22:18