Probelm regarding cpp - C / C++ / MFC Discussion Boards

Exporting template based class from a Dll

PinkPanter1-Jul-02 6:17

1-Jul-02 6:17

How can we build a Dll with template-based-class export capability?
Can we export classes like this:

#ifdef INSIDE_DLL_PROJECT
#define DLL_OBJ __declspec(dllexport)
#else
#define DLL_OBJ __declspec(dllimport)
#endif

template<class T>
class DLL_OBJ SimpleTemplateClass
{
//declarations and class interface
};

I want to hide my implementation template classes and build a Dll (as we do for non-template export Dll) instead of distributing all class codes in an .h unit.
Does the same problem prevent MS to build WTL Dlls?
I use MS Visual C++ 6.

Re: Exporting template based class from a Dll

Mike Nordell2-Jul-02 7:17

Mike Nordell

2-Jul-02 7:17

Since your < and > signs disappeared I can't really say. But you can _not_ ship anything where you are not exporting the explicit instantiations of a template class without shipping the code itself.

It's three steps:
1 - Class template (the code).
2 - Template class (the code instantiation of that template class).
3 - Exporting 2.

CArchiveRxception : badClass

Olivier REIX1-Jul-02 6:07

Olivier REIX

1-Jul-02 6:07

Hi,

(FYI : Moving my project from VC6 to VC7, I have an horrible amount of problems.)
The last one is I can not read my old files. The same code compiled with VC6 is OK. Now if I compile with VC7, I have a CArchiveException::badClass.

The output window of the debugger write :
"Warning: Cannot load DCStoreContents from archive. Class not defined.
CArchive exception: badClass."

Any idea ?

Re: CArchiveException : badClass

Olivier REIX2-Jul-02 21:32

Olivier REIX

2-Jul-02 21:32

The answer was found on Microsoft forum : this is a bug of VC7 (modification of the IMPLEMENT_SERIAL macro) and we just have to wait for the service release.

Re: CArchiveException : badClass

zebbedi15-Dec-03 10:47

zebbedi

15-Dec-03 10:47

I have just got this same error under visual studio 2003 when trying to serialize a CMapStringToOb class from disk back into the hash table from inside a MFC DLL. The strange thing is im also serializing about another 6 CArray objects which work with no problem what so ever.

From what i can gather this bug was found in 2002 .NET and has still not been fixed??

Did you ever get your code working?

Thanks

zebbedi

Re: CArchiveException : badClass

Olivier REIX15-Dec-03 20:20

Olivier REIX

15-Dec-03 20:20

Wow, this was one year ago !

As I wrote, there was a bug in the IMPLEMENT_SERIAL macro in the VS.NET 2002, which was signaled in Microsoft Forum.

In June this year, I tried again to move our VC6 project to the (then) new VS.net 2003 and this time I think it worked correctly from the beginning (I do not remember having any of this problem - but I did have others).

So I don't think I have had the problem with VS 2003, and I can not see how to help, sorry.

Best regards,
Olivier

Re: CArchiveException : badClass

zebbedi15-Dec-03 20:44

zebbedi

15-Dec-03 20:44

Thanks for the reply,

Just out of interest were you using a collection class of some type (CArray, CMap etc). If so please could you tell me which.

My DLL currently has another 6 CArray collections in it which serialize no problem. Its only this CMapStringToOb that is giving me grief.

Soon as i take the exact same code outside the DLL it works perfectly.

Probelm regarding cpp

SamirSood1-Jul-02 4:44

SamirSood

1-Jul-02 4:44

I have a probelm that one of my cpp files is converted into the Hex code automatically . The exe is working fine but i am not able to trace the code back.
Can you suggest some Solution

Samir Sood

Re: Probelm regarding cpp

[James Pullicino]1-Jul-02 5:06

[James Pullicino]

1-Jul-02 5:06

Are you compiling in debug mode?

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CEdit Control Co-Ordinates

Chavez1-Jul-02 4:18

Chavez

1-Jul-02 4:18

Hi, I would like to get hold of the co-ordinates of an Edit control on a dialog.

I've tried creating a control var for that Edit box and using of it's functions but am having no joy.

I would appreciate any help you could give me.

Jacques Victor

Re: CEdit Control Co-Ordinates

dazinith1-Jul-02 4:41

dazinith

1-Jul-02 4:41

CEdit* pEdit = (CEdit*)GetDlgItem(IDC_MYEDIT);
CRect EditRect;
pEdit->GetWindowRect(EditRect); // puts coordinates into CRect
ScreenToClient(EditRect); // converts from screen coordinates to relative to the dialog its in

EditRect.top -= 50; // subtract 50 from the top pos
// set the position to the new position
pEdit->SetWindowPos(&wndTop, EditRect.left, EditRect.top, 0, 0, SWP_NOZORDER | SWP_NOSIZE);

// hope that helps

-dz

Need a DialogBar HOWTO

bisserke1-Jul-02 3:56

bisserke

1-Jul-02 3:56

I'm looking for a decent DialogBar HOWTO.
Need a kind of tool window like those neat panels from macromedia.
I know it can be done with a CDialogBar and with dockable disabled.

It aint so hard to for a single dialog, but i want to use tabs. I cant get it done, so ...

Anybody got an idea how to get the job done, where to find a decent HOWTO ?

ps. i'm quite new to MFC thus... keep answers not too technical Confused | :confused:

thx all

I used to have a life ... now I have a computer

Re: Need a DialogBar HOWTO

[James Pullicino]1-Jul-02 4:00

[James Pullicino]

1-Jul-02 4:00

Can't you insert a tabctrl in your dlg resource?

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Re: Need a DialogBar HOWTO

bisserke1-Jul-02 4:07

bisserke

1-Jul-02 4:07

sure i can. I aint that dumb.

But i got problems creating child windows.
And catching their messages.

I used to have a life ... now I have a computer

Re: Need a DialogBar HOWTO

[James Pullicino]1-Jul-02 5:15

[James Pullicino]

1-Jul-02 5:15

I don't know about child windows, but catching there messages might involve overrriding the following function: CControlBar::WindowProc()

Check the source code for it and you will see something like this:

<br />
LRESULT CControlBar::WindowProc(UINT nMsg, WPARAM wParam, LPARAM lParam)<br />
{<br />
    ASSERT_VALID(this);<br />
<br />
    // Parent notification messages are just passed to parent of control bar.<br />
    switch (nMsg)<br />
    {<br />
    case WM_COMMAND:<br />
    case WM_DRAWITEM:<br />
    case WM_MEASUREITEM:<br />
    case WM_DELETEITEM:<br />
    case WM_COMPAREITEM:<br />
    case WM_VKEYTOITEM:<br />
    case WM_CHARTOITEM:<br />
        return ::SendMessage(::GetParent(m_hWnd), nMsg, wParam, lParam);<br />
    }<br />
    return CWnd::WindowProc(nMsg, wParam, lParam);<br />
}<br />

Add the desired messages you wish to capture after
case WM_CHARTOITEM:

For more info, search for the following article in the MSDN:

Using CDialogBar in 32-Bit MDI Applications
Nigel Thompson
Microsoft Developer Network Technology Group
Created: September 27, 1994

James

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How do you remove or hide the Menu in an MDI window (CMDIFrameWnd)?

1-Jul-02 3:32

How do you remove (without resulting to error) or hide the Menu in an MDI window (CMDIFrameWnd)?

Re: How do you remove or hide the Menu in an MDI window (CMDIFrameWnd)?

[James Pullicino]1-Jul-02 4:06

[James Pullicino]

1-Jul-02 4:06

Have you tried deleting each menu item one by one?

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Re: How do you remove or hide the Menu in an MDI window (CMDIFrameWnd)?

1-Jul-02 5:46

No I haven't tried that, but will try.

Got a solution though: I am currently trying to set the Menu of the Main Frame Window menu to NULL:

////
BOOL CMainFrame::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default

if (GetMenu ())
SetMenu (NULL);

return CMDIFrameWnd::OnEraseBkgnd(pDC);
}
////

It works.. except sometimes there are some minor flicker when adding or closing child windows.

Other ideas are much appreciated Smile | :)

Thanks.

dialog from property sheet? (newbie)

1-Jul-02 3:09

I have a property sheet, which I added a button.
The button brings up a modeless dialog, using the Visual C++'s sample modeless code. The dialog is never visually created, but successfully returns from the Create call (i.e., 1).

m_pCrowsFeet_modeless = NULL;
if (m_pCrowsFeet_modeless == NULL){
m_pCrowsFeet_modeless = new CrowsFeet_Dlg(this);
BOOL dana1 = m_pCrowsFeet_modeless->Create();
if (dana1 == TRUE)
GetDlgItem(IDOK)->EnableWindow(FALSE);
}
else
m_pCrowsFeet_modeless->SetActiveWindow();

The value of dana1 from the Create is 1. But the error occurs when
EnableWindow(FALSE) is invoked. That is the ASSERT(::IsWindow(m_hWnd) is violated and aborts.

CWnd* CWnd::GetDlgItem(int nID) const
{
ASSERT(::IsWindow(m_hWnd));

if (m_pCtrlCont == NULL)
return CWnd::FromHandle(::GetDlgItem(m_hWnd, nID));
else
return m_pCtrlCont->GetDlgItem(nID);
}

The dialog works when called from an application, but not from a property sheet.

Is not a property derived from Cwnd and therefore an IsWindow?
The this from the dialog code does not appear to have a m_hWnd.
Is this true of a propertysheet?

Although the same parent is used to create a window

BOOL ret = Create(NULL, windowName, WS_OVERLAPPEDWINDOW | WS_VSCROLL,
CRect(10,10,300,400), parent, 0);

Thanks, dana

Re: dialog from property sheet? (newbie)

Prem Kumar1-Jul-02 4:47

Prem Kumar

1-Jul-02 4:47

try removing the 'this' in the line

m_pCrowsFeet_modeless = new CrowsFeet_Dlg(this);

and then see.

Attach to process

Hans Ruck1-Jul-02 2:53

Hans Ruck

1-Jul-02 2:53

I click Build/Start Debug/Attach to process. Normally i must get the processes list as i can choose something from it. But the list is empty.
Do you know how could i bring the PIDs into the list?

rechi

Re: Attach to process

Hans Ruck1-Jul-02 3:14

Hans Ruck

1-Jul-02 3:14

This was related to the one below.
The problem will not appear if you don't have any service blocked.

rechi

ATL service stopping

Hans Ruck1-Jul-02 2:19

Hans Ruck

1-Jul-02 2:19

I've created an ATL service. I've started it and it was ok, but the stop action blocked and now the service is in stopping state.
How should i stop the service without reboot?

rechi

Re: ATL service stopping

Christian Graus1-Jul-02 2:27

Christian Graus

1-Jul-02 2:27

You have a problem. I stop mine by killing the process all the time ( as well as in the proscribed manner ) and on the odd case it's done that, I've needed to change and rebuild it.

I don't recall what was wrong.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Remember that amateurs built the ark. Professionals built the Titanic.

Re: ATL service stopping

Hans Ruck1-Jul-02 2:36

Hans Ruck

1-Jul-02 2:36

Unfortunately, killing the process is impossible because the access is denied.
I don't know how do you kill your process all the time but anyway i can't do it because i have to unload some resources on processing stop signal.
I will reboot.

rechi

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