ATL / WTL / STL Discussion Boards

Radu Sorin27-Apr-06 23:08

27-Apr-06 23:08

I am using VC2003 and working on a mfc project that includes ALT(i'm a beginer in ATL) and I encountered the folowing problem :

I have defined some properties

interface IATLDisplay : IDispatch{
// ..... more properties
// the next line is the one with the problem
[propget, id(2), helpstring("property GetLastChangeTime")] HRESULT GetLastChangeTime([out, retval] COleDateTime* pVal);
};

Upon compiling i get the folowing error message :
error MIDL2025 : syntax error : expecting a type specification near "COleDateTime" - error related to the above presented line

Any ideea why this apears ? do i need to import some aditional .idl file ?
Thanks for any help .

Re: ATL property problem

Kurt _B28-Apr-06 5:25

Kurt _B

28-Apr-06 5:25

COleDateTime is a MFC\ATL class and cannot be used in a idl file, you need to use DATE*.

STL allocators in shared memory

psbasha27-Apr-06 4:07

psbasha

27-Apr-06 4:07

Hi ,
I am working on a C++ allocator class in shared memory(UNIX).
I can see that the allocator creates space for the object being pushed in the shared memory but the vector skeleton resides in the usual process address space(I mean in stack or in heap).
When i fork ,I get a copy of the vector and the shared segment in the child process . But any updations made by the child is now no longer visible to the parent process.
The psedo code is as follows:

if (fork()==0)
{
push new elements to the vector //child
}
else
{
shmdt(shared segment);
getchar();
shmat(sharedid);
Iterate vector in parent
}

In the above pseudo code , If i iterate in the parent I am not
able to see the changes in the parent.

Please suggest a solution to make the parent visible of whatever changes i make in the child.

Thanks in advance

Re: STL allocators in shared memory

Nemanja Trifunovic27-Apr-06 4:19

Nemanja Trifunovic

27-Apr-06 4:19

psbasha wrote:
I am working on a C++ allocator class in shared memory(UNIX).

I don't mean to discourage you, but such an allocator already exists and is freely available. It was originally published at C/C++ Users Journal - if you look around, I am sure you'll be able to find the code.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: STL allocators in shared memory

Stephen Hewitt27-Apr-06 20:06

Stephen Hewitt

27-Apr-06 20:06

Namanja is correct; implementations already exist. One such implementation is called Shmem and comes with the Boost librarys. Here are some links.
Shmem docs[^]
Boost[^]

It's free and multiplatform.

Steve

Using CString in ATL Service

MasthanRao27-Apr-06 3:21

MasthanRao

27-Apr-06 3:21

hi,

i have implemented a COM object in ATL. the string values are BSTR data types. i have been able to implement CString in DCOM by including the <afxwin.h> and <afxdisp.h> in the StdAfx.h file. i did the same in my COM server and i get an error : fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h>

meanwhile, i have not included any windows.h file.

BSTR is more complex to handle than CString. isn't it possible to use CString in COM. why does it work in my DCOM and fail in my COM. be most grateful to find a way out of this.
Already this questioned was answered in expertsexchange.com but we need to pay to see the answer. Please can any one let me know the solution.

http://www.experts-exchange.com/Programming/Programming_Languages/Cplusplus/Q_20776014.html"

Thanks

Masthan

-- modified at 9:22 Thursday 27th April, 2006

Re: Using CString in ATL Service

RChin27-Apr-06 23:53

RChin

27-Apr-06 23:53

What version of VS are you using? Because since 7.0 CString was changed to a templated class. So it became possible to use the CString in MFC (which will give you the above problems, if using VS6), and ATL.

For ATL specific project, use the CAtlString class. CString is virtually derived from that, but you can used it in your ATL project.

I Dream of Absolute Zero

Re: Using CString in ATL Service

MasthanRao28-Apr-06 1:05

MasthanRao

28-Apr-06 1:05

Hi,
Thanks for your response. I am using VS6. I am trying to build ATL COM Service and hence in the AppWizard I am not able to add support from MFC to my workspace. If I want to add MFC to my project how can I do that?
Regards

-- modified at 7:06 Friday 28th April, 2006

ATL Exe

Anthony988726-Apr-06 12:33

Anthony9887

26-Apr-06 12:33

Hi,

I'm creating an ATL Exe Server that wraps an ActiveX(OCX) control inside the exe server. All the methods and events of the ActiveX are mapped to the Exe servers methods and events. I'm having a problem with one of the events fired from the ActiveX control to the Server Exe back to the Client. When I fire the event via the Invoke command it returns an error CO_E_NOTINITIALIZED. The other events fire without any problems. The only thing I can think of, is the event in the ActiveX control that is firing the event is on a seperate thread. Any ideas?

Thanks

Re: ATL Exe

Stephen Hewitt26-Apr-06 13:37

Stephen Hewitt

26-Apr-06 13:37

CO_E_NOTINITIALIZED means that CoInitialize, CoInitializeEx or OleInitialize hasn't been called for the thread.

Steve

Re: ATL Exe

Anthony988727-Apr-06 3:26

Anthony9887

27-Apr-06 3:26

Hi Steve,

Do I need to call the CoInitialize in the ActiveX(OCX) thread for that event. I tried that too, I then get the following error.
RPC_E_WRONG_THREAD which translates to "The application called an interface that was marshalled for a different thread." I don't know what to do next. Any ideas?

Thanks

Re: ATL Exe

Stephen Hewitt27-Apr-06 13:48

Stephen Hewitt

27-Apr-06 13:48

I suspect you're passing interface pointers between threads without marshalling. In general this can't work as COM has to take the difference in the threading models into account and it does this by setting by proxies and stubs when an interface is marshaled. Threading is complicated.

Steve

Re: ATL Exe

Anthony988727-Apr-06 14:04

Anthony9887

27-Apr-06 14:04

Hi Steve,

Do you know how I can do this between the ActiveX(OCX) and the ATL Exe Server?

Regards,

how to add code for user can adjust controls postion?

CooperWu22-Apr-06 6:23

CooperWu

22-Apr-06 6:23

how to programming for allow users drag & drop spliter to adjust
control position?

just like windows explorer.
you can adjust position of both left directory tree and right file
details.

and I need add this function in Standard VC++ 6.0 (can't using MFC).
because I need add this in my ATL control.

thanks in advance.

Re: how to add code for user can adjust controls postion?

Michael Dunn22-Apr-06 9:17

Michael Dunn

22-Apr-06 9:17

WTL has splitter windows, see my WTL article[^] on the subject.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: how to add code for user can adjust controls postion?

CooperWu23-Apr-06 0:28

CooperWu

23-Apr-06 0:28

to Mike,

Thanks for your reply. I have read your acticle your provided. this is a class under MFC. can you using it in my ATL (not support MFC)?

Thanks in advance.

Re: how to add code for user can adjust controls postion?

Jörgen Sigvardsson23-Apr-06 2:30

Jörgen Sigvardsson

23-Apr-06 2:30

No, it's not an MFC class. The article however is targeted at MFC developers, making the WTL learning curve less steep.

Re: how to add code for user can adjust controls postion?

Michael Dunn23-Apr-06 7:30

Michael Dunn

23-Apr-06 7:30

CSplitterWindow is a WTL class, not MFC, you'll have no trouble using it in an ATL project as long as you add the right WTL includes. See Part 1 and 2 of the series for details on how to set up a WTL project.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: how to add code for user can adjust controls postion?

CooperWu23-Apr-06 18:29

CooperWu

23-Apr-06 18:29

Thank you very much, I will try it later, Now I am coding for other important functions in my project.
Smile | :)

Re: how to add code for user can adjust controls postion?

CooperWu26-Apr-06 19:52

CooperWu

26-Apr-06 19:52

Hi Mike,
I am writing code for add a splitter now.
I downloaded WTL7.1 and setuped it. then add this includes into vc directories.

But, there are many errores happened when I add two include(atlapp.h and atlsplit.h) only.

the following text is error messages
--
D:\WTL71\INCLUDE\atlapp.h(397) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlapp.h(398) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlapp.h(596) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlapp.h(600) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlapp.h(601) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlapp.h(604) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlapp.h(845) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atluser.h(39) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atluser.h(39) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atluser.h(57) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atluser.h(82) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atluser.h(205) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atluser.h(490) : see reference to class template instantiation 'WTL::CMenuT<t_bmanaged>' being compiled
D:\WTL71\INCLUDE\atlgdi.h(78) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlgdi.h(86) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlgdi.h(88) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlgdi.h(528) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlgdi.h(682) : see reference to class template instantiation 'WTL::CBitmapT<t_bmanaged>' being compiled
D:\WTL71\INCLUDE\atlsplit.h(824) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlsplit.h(852) : see reference to class template instantiation 'WTL::CSplitterWindowImpl<t,t_bvertical,tbase,twintraits>' being compiled
D:\WTL71\INCLUDE\atlsplit.h(823) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlsplit.h(863) : see reference to class template instantiation 'WTL::CSplitterWindowT<t_bvertical>' being compiled
D:\WTL71\INCLUDE\atlsplit.h(823) : error C2872: 'ATL' : ambiguous symbol
D:\WTL71\INCLUDE\atlsplit.h(863) : see reference to class template instantiation 'WTL::CSplitterWindowT<t_bvertical>' being compiled
E:\Workspace_synviz\SynViz1.1\SynVizRGGantt\StdAfx.cpp(8) : error C2856: #pragma hdrstop cannot be inside an #if block
E:\Workspace_synviz\SynViz1.1\SynVizRGGantt\StdAfx.cpp(9) : error C2856: #pragma hdrstop cannot be inside an #if block
Error executing cl.exe.
--

ATL + WTL these confuse me deeply.
Thanks in advance.

Re: how to add code for user can adjust controls postion?

Steve Echols26-Apr-06 20:21

Steve Echols

26-Apr-06 20:21

Just a thought, have you tried Build->Rebuild All? That seems to fix some problems I've had in the past...

[EDIT]Are you including these files in stdafx.h?[/EDIT]

- S
50 cups of coffee and you know it's on!

-- modified at 2:23 Thursday 27th April, 2006

Re: how to add code for user can adjust controls postion?

CooperWu26-Apr-06 20:30

CooperWu

26-Apr-06 20:30

Hi Steve Echols,
Thanks for your reply.

Steve Echols wrote:
Just a thought, have you tried Build->Rebuild All? That seems to fix some problems I've had in the past...

--
I alway press F7 key from building my project. F7 is short key for ‘Rebuild ALL’.

Steve Echols wrote:
Are you including these files in stdafx.h?

--
yes. I add these include in 'stdafx.h' file.

Re: how to add code for user can adjust controls postion?

Michael Dunn27-Apr-06 19:42

Michael Dunn

27-Apr-06 19:42

ah, I forgot to mention that when you use WTL and MFC in the same project, you need to #define _WTL_NO_AUTOMATIC_NAMESPACE before the WTL headers because some classes in MFC and WTL have the same name (like CString).

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: how to add code for user can adjust controls postion?

CooperWu27-Apr-06 19:58

CooperWu

27-Apr-06 19:58

Hi Mike,
I changed the code like you told me.
but, the system still output error messages, just like I didn't add [#define _WTL_NO_AUTOMATIC_NAMESPACE] before the WTL headers.

--
C:\WTL71\INCLUDE\atlapp.h(396) : error C2872: 'ATL' : ambiguous symbol
--> Source Code : ATL::CSimpleArray<CMessageFilter*> m_aMsgFilter;
...

Michael Dunn wrote:
because some classes in MFC and WTL have the same name (like CString).

I am developing a ATL com without MFC. does it something wrong?

Thanks for your help.

about safe unsubclass window

FlyWithYou21-Apr-06 20:02

FlyWithYou

21-Apr-06 20:02

Hi.
----------------------------------------

AtlWin.h some code about unsubclass window:

				// unsubclass, if needed<br />
				LONG_PTR pfnWndProc = ::GetWindowLongPtr(pThis->m_hWnd, GWLP_WNDPROC);<br />
				lRes = pThis->DefWindowProc(uMsg, wParam, lParam);<br />
				if(pThis->m_pfnSuperWindowProc != ::DefWindowProc && ::GetWindowLongPtr(pThis->m_hWnd, GWLP_WNDPROC) == pfnWndProc)<br />
					::SetWindowLongPtr(pThis->m_hWnd, GWLP_WNDPROC, (LONG_PTR)pThis->m_pfnSuperWindowProc);<br />
#if (_ATL_VER >= 0x0700)<br />
				// mark window as destryed<br />
				pThis->m_dwState |= WINSTATE_DESTROYED;<br />
#else // !(_ATL_VER >= 0x0700)<br />
				// clear out window handle<br />
				HWND hWnd = pThis->m_hWnd;<br />
				pThis->m_hWnd = NULL;<br />
				// clean up after window is destroyed<br />
				pThis->OnFinalMessage(hWnd);<br />
#endif // !(_ATL_VER >= 0x0700)

---------------------------------------

WINCORE.CPP some code about unsubclasswindow

// call default, unsubclass, and detach from the map<br />
WNDPROC pfnWndProc = WNDPROC(GetWindowLongPtr(m_hWnd, GWLP_WNDPROC));<br />
Default();<br />
if (WNDPROC(GetWindowLongPtr(m_hWnd, GWLP_WNDPROC)) == pfnWndProc)<br />
{<br />
    WNDPROC pfnSuper = *GetSuperWndProcAddr();<br />
    if (pfnSuper != NULL)<br />
        SetWindowLongPtr(m_hWnd, GWLP_WNDPROC, INT_PTR(pfnSuper));<br />
}<br />
Detach();

----------------------------------------------------
1.Why in ATL when "pThis->m_pfnSuperWindowProc == ::DefWindowProc " not need restore old wndproc, but in MFC without this compare?

2.Now i write subclass window(mulriple, like DefWindowProc -> My subclass -> CWnd subclass(CWindow subclass) or DefWindowProc -> CWnd subclass(CWindow subclass) -> my subclass), and can safe unsubclass window. which above code i can modification and use in my code?

Thanks.

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