Re: How to store a put a template class into a CList object? - C / C++ / MFC Discussion Boards

30-Jan-01 7:06

I have a very annoying problem. I have two static classes, declared right after each other and somehow, I want them to be able to reach each other...

static class A : public Location
{
public:
Location *GetB { return &B; }
} A;

static class B : public Location
{
public:
Location *GetA { return &A; }
} B;

The code above is how I 'want' it to work.
Any help on this would be very appreciated.

Erik

Confused | :confused:

Re: Static class problem

Jason Douglas30-Jan-01 8:48

Jason Douglas

30-Jan-01 8:48

First of all, let me say that I've never seen ANYONE declare a static class in the same manner as a struct typedef. I would recommend changing your code for clarity's sake, but that's now back to your question...

If you would like each class to access the other, I would recommend the following:

<br />
class A : public Location<br />
{<br />
public:<br />
static A instance;<br />
Location* GetB() { return &B::instance; };<br />
}<br />
<br />
class B : public Location<br />
{<br />
public:<br />
static B instance;<br />
Location* GetA() { return &A::instance; };<br />
}<br />

Hope this helps! (Basically, you create two singleton objects.) Wink | ;)

Re: Static class problem

Michael Dunn30-Jan-01 15:13

Michael Dunn

30-Jan-01 15:13

You need to forward-declare class B before the definition of class A. (And BTW, your naming is confusing - a class "A" and a variable "A" together is a no-no if you care about readability.)

class B;  // forward declaration
 
class A : public Location
{ ... } objectA;
 
class B: public Location
{ ... } objectB;

--Mike--
http://home.inreach.com/mdunn/
Time is an illusion; lunchtime doubly so.

Implementing an undo

30-Jan-01 5:43

Hi does anyone have links or idea on different way of implementing an undo for my app...
thanks
Raphael mor

Re: Implementing an undo

Christian Graus30-Jan-01 11:09

Christian Graus

30-Jan-01 11:09

You have two options - maintain a list of copies to the entire document in different states, or maintain a list of actions that you can unperform.

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

How to store a put a template class into a CList object?

leonwoo30-Jan-01 2:35

leonwoo

30-Jan-01 2:35

hi,
I have been trying to include a template class into a CList object but i it does not seem to work. I have tried to put in this way in the "Population" class:

Typedef Chromosome<cgene> chromosome

CList<chromosome,chromosome> PopulationArray;

Is there any way to put a template class into another template class??

I appreciate your help. Thank you.

leonwoo

Re: How to store a put a template class into a CList object?

Walter Gildersleeve30-Jan-01 5:02

Walter Gildersleeve

30-Jan-01 5:02

I'm not having problems inserting template classes in a CList:

template <class t="">
class Cell {
public :
T SetData(const T& t) {
T old = data;
data = t;
return old;
}
T GetData() const {
return data;
}
private :
T data;
};

CList<cell<int>, Cell<int> > lst;//NOTE--there *must* be a space between the right-most braces : > >
lst.

Walter Gildersleeve
Freiburg, Germany
walter.gildersleeve@pe-gmbh.de

Re: How to store a put a template class into a CList object?

leonwoo31-Jan-01 3:37

leonwoo

31-Jan-01 3:37

Thanks for your reply Walter,

can you please clarify what it means by CList ,Cell >1st.......>>1st

thank you
Smile | :)

leonwoo

Re: How to store a put a template class into a CList object?

Michael Dunn30-Jan-01 15:22

Michael Dunn

30-Jan-01 15:22

typedef Chromosome<CGene> chromosome;
CList<chromosome,chromosome> PopulationArray;

This should work fine. What error messages are you getting when you try this?

--Mike--
http://home.inreach.com/mdunn/
Time is an illusion; lunchtime doubly so.

Re: How to store a put a template class into a CList object?

leonwoo31-Jan-01 3:33

leonwoo

31-Jan-01 3:33

Thanks for your reply,

The error message that i've got is "no copy constructor to copy the data type Chromosome<cgene>".

For now i can't remember the complete message but i will put it in after i've copied the message.

Smile | :)

leonwoo

Re: How to store a put a template class into a CList object?

Michael Dunn31-Jan-01 4:31

Michael Dunn

31-Jan-01 4:31

Then you need to write a copy constructor. Cool | :cool:

--Mike--
http://home.inreach.com/mdunn/
Time is an illusion; lunchtime doubly so.

Windows NT Service vs. ATL Service EXE

Nikhil29-Jan-01 23:49

Nikhil

29-Jan-01 23:49

Hi!!

I am required to develop a Windows NT Service EXE in my project. While reading through MSDN, I came across the "ATL Service EXE" option when developing ATL components.

Could anybody please tell me the the difference between the two?
Which option is preferrable?
What factors does this selection depend on?

Please help me as I am new to VC++!!!

Thanks & Regards,

Nikhil.
(nkapre@hotmail.com)

Nikhil

Compiler Error

Amit Dey29-Jan-01 23:35

Amit Dey

29-Jan-01 23:35

What does compiler error 'Float Inexact value' mean? I'm using ATL and automation.
Thanks,

String across DLL's

Amit Dey29-Jan-01 23:29

Amit Dey

29-Jan-01 23:29

Hi,
I'm using a VB activeX dll for some string manipulatation stuff. This requires that from the client (VC) i pass strings to VB Dll. What datatype should I use? VB Variant seems to work good. From the client I'm using a CComBSTR to hold value.Ideally the data should be variant but is String also supported?
Thanks,
Amit.

Re: String across DLL's

C^hris L^osinger30-Jan-01 4:00

C^hris L^osinger

30-Jan-01 4:00

BSTR

Load video from an IStream

29-Jan-01 22:07

Hi!

I have a video stored in a IStream, anyone know how to play this video without copy it to a file first. (Using an y version of the mediaplayer)

/Markus

Markus

Problem with a tree view !!!

Walid MEDDEB29-Jan-01 21:59

Walid MEDDEB

29-Jan-01 21:59

my app contains a menu with two item.
the 1st item (MENU_ITEM_1), opens a tree, the second item (MENU_ITEM_2) opens a
dialog(1),
when the tree is opened by (MENU_ITEM_1), i made a selection on a tree-item that pops
up a dialog(2),
so i select from menu, MENU_ITEM_2 that pops up dialog(1),
my prblm is that when i reselect from menu MENU_ITEM_1, the tree appears but
the appropriate dialog no ( the MENU_ITEM_2 (dialog1) remains ) even if i send a
"brute"
TVN_SELCHANGED to the same ITEM.....to enforce the rigth dialog(2)...

this is portion of my code: ( in fact its not a menu but buttons that pops up dialog )

portion of code that catch TVN_SELCHANGED to display a dialog for each item:
case WM_NOTIFY:
switch (((LPNMHDR)lParam)->code)
{
case TVN_SELCHANGED:
hItem = TreeView_GetSelection(hTree);
tvi.mask = TVIF_PARAM|TVIF_TEXT;
tvi.hItem = hItem;
TreeView_GetItem(hTree,&tvi);

if ( tvi.lParam == 1 )
{
if ( hSkills == NULL )
hSkills =
CreateDialog(g_hInstance,MAKEINTRESOURCE(competences_cles),hWnd,(DLGPROC)Skills_Proc);
else SetFocus(hSkills);
}
...........

portion of code that catch the buttons selection:
case WM_COMMAND:
switch(LOWORD(wParam))
{
// the famous MENU_ITEM_2(dialog1)
if ( HWND(lParam) == (HWND)hJobsButton )
{
ShowWindow(hTree,SW_HIDE);
if ( hJobs == NULL )
hJobs = CreateDialog(g_hInstance,MAKEINTRESOURCE(emplois),hWnd,(DLGPROC)Jobs_Proc);
else SetFocus(hJobs);
}
// ***** MY PROBLEM MENU_ITEM_1(dialog2) *********
// *****************************************
if ( HWND(lParam) == (HWND)hMyResumeButton )
{
if ( hTree == NULL )
{
Create_Default_Tree(hWnd);
SetFocus(hTree);
}
else
{
ShowWindow(hTree,SW_SHOW);
SetFocus(hTree);
//TreeView_Select(hTree,hSkillsTree,TVGN_CARET);
//TreeView_Select(hTree,hItem,TVGN_CARET);
//SendMessage(hTree,TVM_SELECTITEM,TVGN_CARET,(LPARAM)hItem);
}
}

so can u help me please , i can't resolve it since a lot of time... :<

ActiveX Param Tag Values

29-Jan-01 11:17

I am probably mangling my attempts at getting a PARAM value into my activeX control (MS VC++ 6).. I have set MayScript, etc. and the control works otherwise, But I can't figure out how to get the PARAM Values in... need simple strings available globally... An example project would be GREATLY appreceated!!!

A compiler error

winyu29-Jan-01 7:37

winyu

29-Jan-01 7:37

// ----------- I declare a class constructor & destructor like this...
#include "afxdlgs.h"
class CEditSongListDialog : public CFileDialog
{
public:
CEditSongListDialog (BOOL bOpenFileDialog,
LPCTSTR lpszDefExt = NULL,
LPCTSTR lpszFileName = NULL,
DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
LPCTSTR lpszFilter = NULL,
CWnd* pParentWnd = NULL);
~CEditSongListDialog ();
...
}

// ---------- And define them like this...
CEditSongListDialog ::CEditSongListDialog (BOOL bOpenFileDialog,
LPCTSTR lpszDefExt,
LPCTSTR lpszFileName,
DWORD dwFlags,
LPCTSTR lpszFilter,
CWnd* pParentWnd)
:CFileDialog (bOpenFileDialog, lpszDefExt, lpszFileName, dwFlags, lpszFilter, pParentWnd)
{
m_ofn.Flags |= OFN_EXPLORER | OFN_ENABLETEMPLATE | OFN_ENABLEHOOK | OFN_ALLOWMULTISELECT;
m_ofn.lpTemplateName = MAKEINTRESOURCE(IDD_EDITSONGLIST);
m_ofn.lpstrTitle = "Edit Song List";
m_ofn.lpstrFilter = "*.MP3";
}
CEditSongListDialog ::~CEditSongListDialog()
{
UnhookWindowsHookEx (ESL_HookHandle);
nOnceOnly = 0;
}

// -------------- Then I get error message like this...
Compiling...
EditSongListDialog.cpp
Linking...
RR_SWallDlg.obj : error LNK2005: "public: virtual __thiscall CEditSongListDialog::~CEditSongListDialog(void)" (??1CEditSongListDialog@@UAE@XZ) already defined in EditSongListDialog.obj
Debug/RR_SWall.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

// ------------- The question is "what wrong with my program ???"

Re: A compiler error

Michael Dunn29-Jan-01 9:02

Michael Dunn

29-Jan-01 9:02

It's saying you have the CEditSontListDialog destructor defined in more than one place. The other place is in RR_SWallDlg.cpp (the file listed in the linker error).

--Mike--
http://home.inreach.com/mdunn/
Time is an illusion; lunchtime doubly so.

Urgent: Pop up menus and SFTTree

Ole Chr. Birkeland29-Jan-01 4:16

Ole Chr. Birkeland

29-Jan-01 4:16

Hi.

I'm trying to improve a small dialog box which is part of a large program.
The list in the dialog box has been created using a SFTTree list control(Softelvdm Inc).
I'm trying to add a pop up menu when rightclicking within the list control, but have so far been unsuccessful at it.

I've tried to cut'n'paste code from a different non-SFTTree dialog box. Although the code seems to execute correctly (when tracing during debug), nothing happens. I've included the function with the code below.

void CAlarmEditPage::OnSFTTreeContextMenu(CWnd* pWnd, CPoint point)
{
TRACE("OnSFTTreeContextMenu()\n");

CMenu menu;
if(menu.LoadMenu(ID_POPUP_MENU)) // Use the What's This? Menu
{
CMenu* pPopup=menu.GetSubMenu(0);
pPopup->DeleteMenu( 0, MF_BYPOSITION ); //Remove "What's this"-Menu-item

pPopup->AppendMenu(MF_STRING, ID_HELP, "Help on selected alarm");
pPopup->TrackPopupMenu(TPM_LEFTALIGN|TPM_RIGHTBUTTON,point.x,point.y,this);
}
menu.DestroyMenu();

}

Is the code correct? Is there anything else which might cause the menu not to appear? All help greatly appreciated.

Regards,
Ole Chr. Birkeland

Request: Samplecode QuickTime

AlexMarbus29-Jan-01 3:45

AlexMarbus

29-Jan-01 3:45

Hi,

I am thinking about a freeware application, that should be able to display and manipulate images. I've looked at the more famous libraries, such as ImageGear. Until I noticed QuickTime was free to use. Does anybody know a link with some sample-code how to use this? Or where I can download the SDK? (Didn't found it @ apple). Thanks!

--
Alex Marbus

LisView

29-Jan-01 3:20

Hi. I made an aplication chosing, in the step 5 in create proyect, the windows explorer option. Now i had a window wich on the left side there is a tree control and on the right i need a tab control or property sheet with pages and inside the pages an excell work-sheet. If there is anyone with a code with a similar aplicacion please send it to me or please help me to create one. I´m desperate! thanks. Confused | :confused:

How to change the caption of the "open" button?

leonwoo29-Jan-01 2:56

leonwoo

29-Jan-01 2:56

hi,
I would like to change the caption of a button on a "open file dialogue". Do you know how to do it??

Thank you.

Smile | :)

leonwoo

Re: How to change the caption of the

Christian Graus29-Jan-01 11:28

Christian Graus

29-Jan-01 11:28

It's id is defined in dlgs.h and is something like btn1 or btn2. try GetDlgItem on different numbers working up until one works ;0)

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Last Visit: 31-Dec-99 18:00 Last Update: 23-Apr-24 11:31

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