Static class problem - C / C++ / MFC Discussion Boards

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Re: ListBox??

David Fedolfi31-Jan-01 3:02

David Fedolfi

31-Jan-01 3:02

You want it to be:

void CMenuDlg::StartGame()
{
if (m_Games.GetLbText(m_Games.GetCurSel()) == "Tribes")
{
//Do Somthing
}
}

There ia an aletrnative (and possible easier approach). Since you are obviously using this as an application launcher, you coudl store the command line you are executing as m_Games's Item data. Something like teh following;

m_Games.SetItemData(m_Games.InsertItem("Tribes"), DWORD("c:\\program files\\tribes\\tribes.exe"));

then your start game function woudl look like:

CString strCommand = LPCSTR(m_Games.GetItemData(m_Games.GetCurSel()));

then call ShellExecute (or whatever you're using to launch the application) with strCommand.

Note - this post made before morning coffee and ius therefore subject to containing countless errors and typos.

Re: ListBox??

31-Jan-01 6:06

I did what you did:

void CMenuDlg::StartGame()
{

if (m_Games.GetLbText(m_Games.GetCurSel()) == "Tribes");
{
//Do somthing
}

}

Error:
C:\Dokumenter\C++\Menu\MenuDlg.cpp(184) : error C2039: 'GetLbText' : is not a member of 'CListBox'
c:\programmer\microsoft visual studio\vc98\mfc\include\afxwin.h(2741) : see declaration of 'CListBox'

Dosn't GetLbText belong to a combo box??

Thank's

Re: ListBox??

David Fedolfi1-Feb-01 3:00

David Fedolfi

1-Feb-01 3:00

"Dosn't GetLbText belong to a combo box??"
Yeah it does...and didn't I say that that post was written before morning coffee? Smile | :)

And besides...what do you expect from free advice?

Make that m_Games.GetText(m_Games.GetCurSel()) and it shoudl work better.

Re: ListBox??

Søren Alsbjerg Hørup1-Feb-01 8:51

Søren Alsbjerg Hørup

1-Feb-01 8:51

if (m_Games.GetText(m_Games.GetCurSel()) == "Tribes")
{
//Do somthing
}

Only one error left Smile | :)

error:

Error C2661: 'GetText' : no overloaded function takes 1 parameters

Whats an overloaded function?? I got lots to learn Smile | :)

Ps. Am glad you help's me with this one Smile | :)

Tab Control's

30-Jan-01 10:29

Am trying to make a tab control, but am new at programming, so i would like a litle help
ex: Where i could find Tutorials on a simple Tab Control.

Thank you very much

USB....

Joseph Dempsey30-Jan-01 9:56

Joseph Dempsey

30-Jan-01 9:56

Anyone got an good sources of information on implementing USB functionality. Just looking for some decent reference material.

Thanks.

Joseph Dempsey
jdempsey@cox.rr.com
Joseph.Dempsey@thermobio.com

"Software Engineering is a race between the programmers, trying to make bigger and better fool-proof software, and the universe trying to make bigger fools. So far the Universe in winning."
--anonymous

Re: USB....

Brendan Tregear30-Jan-01 11:43

Brendan Tregear

30-Jan-01 11:43

Try www.usb.org and http://www.lvr.com/usb.htm

My next step would be to open up Copernic (www.copernic.com) and do a search for "USB development" etc..

Sorry I can't help any more...

Static class problem

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!!!

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