C / C++ / MFC Discussion Boards

MFC Extention DLL - Exporting classes.....

BlackSmith31-Dec-01 2:49

31-Dec-01 2:49

The MSDN suggested:

The DLL:
********

#ifndef _INCLUDED_MYCLASS_H_
#define _INCLUDED_MYCLASS_H_

#undef AFX_DATA
#define AFX_DATA __declspec(dllexport)

class CMyClass : public CObject
{
DECLARE_MESSAGE_MAP()
//Class definition...
//
//
};

#undef AFX_DATA
#define AFX_DATA

#endif//_INCLUDED_MYCLASS_H_
************************************************************

In the my app:
**************
#ifndef _INCLUDED_MYCLASS_H_
#define _INCLUDED_MYCLASS_H_

#undef AFX_DATA
#define AFX_DATA __declspec(dllimport)

class CMyClass : public CObject
{
DECLARE_MESSAGE_MAP()
//Class definition...
//
//
};

#undef AFX_DATA
#define AFX_DATA

#endif//_INCLUDED_MYCLASS_H_

The DLL compiles fine, but my app gets unresoulved external about all
used methods. I assume, this for not writing "class AFX_EXT_CLASS MyClass..."
but when I do (DLL or my app) I get:
"error C2487: 'messageMap' : member of dll interface class may not be declared with dll interface"

What todo? Please be specific... 10X!

--BlackSmith--

"With the help of all mighty", 2001, Me.

Re: MFC Extention DLL - Exporting classes.....

Nnamdi Onyeyiri31-Dec-01 7:18

Nnamdi Onyeyiri

31-Dec-01 7:18

I use the AFX_EXT_CLASS and it exports the class fine.

==================================================
The Eclypse

menu from resource redrawing?

Kuniva31-Dec-01 2:40

Kuniva

31-Dec-01 2:40

I have an MFC dialog application and in its properties i assign it a menu. I thought "wow this is easy, i just make a menu and stick it on the dialog, i dont even have to write any code for it". But then i wanted to disable an item and found a problem. this is what i have:

void CMyDlg::OnUpdateMyItem(CCmdUI* pCmdUI)
{
pCmdUI->Enable(FALSE);
}

This disables the menuitem BUT! it doesn't show it disabled. It's like it does it in the background without redrawing the menu. Can anyone tell me how to work with the pointer and all so its updated correctly??
Thanks

(PS: i tried CMyDlg::DrawMenuBar(); , no effect)

Kuniva

Re: menu from resource redrawing?

567890123431-Dec-01 4:37

5678901234

31-Dec-01 4:37

You cannot use ON_UPDATE_COMMAND_UI in dialog. You should directly enable/disable menu items using CMenu class or use some tricks described in http://www.codeguru.com/dialog/index.shtml, CommandUI section.

Re: menu from resource redrawing?

Michael Dunn31-Dec-01 7:09

Michael Dunn

31-Dec-01 7:09

UPDATE_COMMAND_UI doesn't work automagically in dialogs. You need to add a handler for the MFC message WM_KICKIDLE, and in that handler, call:
UpdateDialogControls(this, FALSE);

--Mike--
My really out-of-date homepage
Buffy's on. Gotta go, bye!
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

How do i add the handler?

Kuniva1-Jan-02 3:37

Kuniva

1-Jan-02 3:37

I tried to add the handler by clicking right on my dialog class and slecting Add Message Handler, but i cant seem to define "WM_KICKIDLE". How do i add a handler for a custom message like that?

Happy Newyearrrrrrrrrrrrrrrr!!!!!!!!!!!!!!!!!!!!! :p

Kuniva - Also a big Buffy fan, but mostly for Eliza Dushku (Faith) Smile | :)

TextWidth and GDI+ (Anders is learning GDI+ part 3)

Anders Molin31-Dec-01 1:51

Anders Molin

31-Dec-01 1:51

With the good old GDI I have always used GetTextExtentPoint32() to get the width of a text string on the current DC.

Now I'm am playing around with Gdiplus::Graphics.DrawString(), but I can't find any function that tell me how many pixels my string is going to be (text width) Confused | :confused:

Any ideas?

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: TextWidth and GDI+ (Anders is learning GDI+ part 3)

Andreas Hallberg31-Dec-01 3:51

Andreas Hallberg

31-Dec-01 3:51

You may have some success with the overloaded methods:

Gdiplus::Graphics::MeasureString(...) OR
Gdiplus::Graphics::MeasureDriverString(...)

/Andreas

Re: TextWidth and GDI+ (Anders is learning GDI+ part 3)

Anders Molin1-Jan-02 3:35

Anders Molin

1-Jan-02 3:35

Thanks a lot Smile | :)

- Anders

Money talks, but all mine ever says is "Goodbye!"

OO concept query

sysdeamon31-Dec-01 1:38

sysdeamon

31-Dec-01 1:38

Hi,
i am new to C++ & Object Oriented concepts.
I came across the 'inheritence' chapter in my C++ book & have the following question.
Can a template class be used as a base class ?

thankyou all for replying.

sysdeamon

Re: OO concept query

Aaron Schaefer31-Dec-01 4:17

Aaron Schaefer

31-Dec-01 4:17

Yes!!

Re: OO concept query

Alvaro Mendez31-Dec-01 5:56

Alvaro Mendez

31-Dec-01 5:56

I agree!

Re: OO concept query

Michael Dunn31-Dec-01 7:11

Michael Dunn

31-Dec-01 7:11

Yes, for example:

class CKewlControl : public CWindowImpl<CKewlControl, CStatic>

--Mike--
My really out-of-date homepage
Buffy's on. Gotta go, bye!
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

vin30-Dec-01 19:02

30-Dec-01 19:02

IGx8930-Dec-01 15:49

30-Dec-01 15:49

I just discovered the "Format" tab of the Options dialog in MSVC++ 6.0 Smile | :)

. I clicked on Source Window, and changed the foreground color of String to red, and voila!: all my quotation mark-enclosed strings in the source code view window are in red! I know this isn't a big deal for a lot of you; I had always known that you could change the colors, but I never knew you could color strings Big Grin | :-D

Re: VC++ 6 enhancement

Nnamdi Onyeyiri31-Dec-01 7:42

Nnamdi Onyeyiri

31-Dec-01 7:42

Thanks...I didnt know you could do that....it makes looking at the code easier. Big Grin | :-D

==================================================
The Eclypse

Re: VC++ 6 enhancement

User 66581-Jan-02 3:48

User 6658

1-Jan-02 3:48

Hey it's great Big Grin | :-D

Thanks for the hint and a happy new year Wink | ;)

modified 12-Sep-18 21:01pm.

Selection change notification message

Yury Sulsky30-Dec-01 15:23

Yury Sulsky

30-Dec-01 15:23

Hi,

What's the notification message that a list view control sends when the selection changes? I need the equivalent of LBN_SELCHANGE for the list view control.

Thanks,
Yury Sulsky

LVN_ITEMCHANGED

Yury Sulsky30-Dec-01 17:39

Yury Sulsky

30-Dec-01 17:39

Hehe, never mind, I found it.

Registry problems.

Jason Hooper30-Dec-01 15:17

Jason Hooper

30-Dec-01 15:17

<br />
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run<br />

I can add a value to this programatically under Windows 98, but when I give my program to my friend on XP, CRegKey::Create() fails. Am I not being told something?

Confused | :confused:

-Jason
nirgle.bitdevil.com

Re: Registry problems.

Michael Dunn30-Dec-01 19:16

Michael Dunn

30-Dec-01 19:16

What is the return value from Create()?

--Mike--
My really out-of-date homepage
Buffy's on. Gotta go, bye!
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

Re: Registry problems.

Jason Hooper31-Dec-01 14:17

Jason Hooper

31-Dec-01 14:17

Michael Dunn wrote:
What is the return value from Create()?

Seems to be 161.

// MessageId: ERROR_BAD_PATHNAME
//
// MessageText:
//
//  The specified path is invalid.
//
#define ERROR_BAD_PATHNAME               161L

Perhaps Software needs to be capitalized? Is the Windows XP Registry case sensitive?

BTW here is the code:

CRegKey autoRunKey;
long ret;

if ((ret = autoRunKey.Create(HKEY_CURRENT_USER, "\\Software\\Microsoft\\Windows\\CurrentVersion\\Run")) != ERROR_SUCCESS)
{
    CString f;
    f.Format("Couldn't open key.. return code is %ld", ret);

    AfxMessageBox(f);
}

-Jason
nirgle.bitdevil.com

Re: Registry problems.

Michael Dunn31-Dec-01 14:33

Michael Dunn

31-Dec-01 14:33

hmm, two things to change. 1, remove the backslash before "software". (Case doesn't matter with registry names). 2, never use KEY_ALL_ACCESS with registry functions because they will fail if the user is not an administrator. The default access for the ATL functions I've encountered is KEY_ALL_ACCESS, which in hindsight was a bad design decision. Anyway, don't take the default access, specify exactly the access you need (KEY_WRITE or whatever). You didn't say if the XP user is running as admin, but if they're not, then the access problem is definitely making the call fail.

--Mike--
My really out-of-date homepage
Buffy's on. Gotta go, bye!
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

Re: Registry problems.

Jason Hooper31-Dec-01 14:39

Jason Hooper

31-Dec-01 14:39

Thanks for the quick response. I tried removing the \\ on a hunch, and it ended up working. Good idea. I'll look into the permissions thing too.

Thanks!

Cool | :cool:

-Jason
nirgle.bitdevil.com

Re: Registry problems.

Roger Wright (new)31-Dec-01 14:25

Roger Wright (new)

31-Dec-01 14:25

I haven't yet used XP, but it is supposed to be Win2K warmed over. This may be a permissions issue. Does your friend run the program under a user account that has permission to alter the Registry?

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