CCheckListBox and CListBoxImpl - ATL / WTL / STL Discussion Boards

Steve Messer1-Dec-03 7:03

1-Dec-03 7:03

Joaquin,

It ended up being something really strange.

In my class definition I was adding variables as needed.

int ButtonNumber;
CString TitleCaption, SubCaption, DllName,CommandName, Type;
CString FontName, FontStyle, Purpose;
REAL X,Y,W,H;
float TextPad,ImagePad;
Region *region;
Color *BaseColor, *DefaultColor, *FillColor;;
Image *image;
UINT Width, Height;
REAL FontSize;

I don't know why it worked in the old code but in the new code the addition of "REAL FontSize" was causing the crash. I added FontSize to "REAL X,Y,W,H,FontSize" and removed it from the end of the list of variables and it worked correctly.

It seems that the compiler was having problems lining up the memory for the variables if I didn't keep like variables together.

-Steve

Re: vector question

Joaquín M López Muñoz1-Dec-03 10:06

Joaquín M López Muñoz

1-Dec-03 10:06

Ummm... this smells very bad. I don't think the compiler is doing a mess with members of your class, most likely you're just masking the error.
Maybe you can try the following: add a trace message in your startHandler outputting the sizeof of the class, and compare with what you've got in the main program. Maybe this sheds some light on the problem.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: vector question

Steve Messer1-Dec-03 11:37

Steve Messer

1-Dec-03 11:37

Very good sugguestion. Yes, I know very suspicious behavior.

// crashes
CString Title, Alignment, m_Type;
CString FontName, FontStyle;
int ButtonNumber;
int Padding;
REAL X,Y,W,H;
Region *region;
Color *FontColor;
Color *FillColor;
bool bFill;
REAL FontSize;

// Works fine
CString Title, Alignment, m_Type;
CString FontName, FontStyle;
int ButtonNumber;
int Padding;
REAL X,Y,W,H;
REAL FontSize;
Region *region;
Color *FontColor;
Color *FillColor;
bool bFill;

In all cases and places the size of label is the same (65).

Any other ideas?

Re: vector question

zhao wei4-Dec-03 20:41

zhao wei

4-Dec-03 20:41

Try using a list instead of a vector to holder the pointers.

Re: vector question

Steve Messer5-Dec-03 10:10

Steve Messer

5-Dec-03 10:10

I could try this do you have any reason or explaination to why this would make a difference?

Thanks,

-Steve

Re: vector question

WREY9-Dec-03 4:16

WREY

9-Dec-03 4:16

I know why you're crashing!! It happened to me too, and before I discovered why, it was driving me crazy.

Here's the reason (seriously)!! You're trying to delete pointers to memory that have already been deleted.

I discovered that the compiler will call its own destructor on the vector, which will automatically do the cleaning up for you. But later, when you try doing the cleaning up yourself, you are in effect deleting memory that has already been deleted, and that's what causing the crash. IOW, DON'T do the deleting yourself. Just don't do it. The compiler has already done it for you. (I'm talking from experience. It happened to me also.)

Smile | :)

William

Fortes in fide et opere!

Re: vector question

Steve Messer9-Dec-03 6:11

Steve Messer

9-Dec-03 6:11

William,

Thanks for the insight urr ( experience from the school of hard knocks ).

-Steve

CCheckListBox and CListBoxImpl

bryces26-Nov-03 20:05

bryces

26-Nov-03 20:05

Hi All,

I was wondering if anyone has done any development in WTL with the CCheckListBox? I have a ListBox but want to give the functionality (and feedback to user) that they have selected multiple items.

I have tried using the macro's described in MSDN but have had no luck.

ListView_SetExtendedListViewStyle(this->m_ipCheckList.m_hWnd, LVS_EX_CHECKBOXES);

When I mean no luck, I mean that the above call has no effect on my ListBox (no check box appears next to it).

Any thoughts on what I would have to do to get something like the above going?

thanks
Bryce

Re: CCheckListBox and CListBoxImpl

coge26-Nov-03 22:13

coge

26-Nov-03 22:13

A listbox and listview
are two different controls. Your code will work for a list view
as long as its in report mode but will not for a listbox.
This works in some code I'm currently using for a ListView.

ClistViewControl m_listView
m_listView.Attach( GetDlgItem( IDC_LIST_STATION_DATA) );

m_listView.SetExtendedListViewStyle( LVS_EX_CHECKBOXES | LVS_EX_FULLROWSELECT);

Correct me if I am wrong but the CCheckListBox is a mfc construct not
wtl. The following url explains how to use it
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_cchecklistbox.asp

Hope this helps

Re: CCheckListBox and CListBoxImpl

bryces26-Nov-03 22:36

bryces

26-Nov-03 22:36

Hi,

Thanks for your reply.

I thought there may have been another version of the CheckListBox for WTL... oh well...

How have you defined what your ClistViewControl object is?

The supplied code will not compile as there is no definition of ClistViewControl.

I tried to convert it to CListViewControlImpl m_ListView;

with below in stdafx.h

<br />
class CListViewControlImpl : public CWindowImpl<CListViewControlImpl, ClistViewControl><br />
    { DECLARE_EMPTY_MSG_MAP(); };<br />

Can you please supply your definition on your ClistViewControl.

Thanks
Bryce

Re: CCheckListBox and CListBoxImpl

coge26-Nov-03 23:49

coge

26-Nov-03 23:49

Hi, Im using WTL version 7. In order to use the control wrapper
just add
#include <atlctrls.h> to your stdafx.h.

then you can declare CListViewCtrl m_listView;
and use it accordingly

If your still having problems i can send you a sample app.

Hope this helps Smile | :)

edit:
whoops the <> were lost in html.

Re: CCheckListBox and CListBoxImpl

bryces27-Nov-03 1:27

bryces

27-Nov-03 1:27

Thanks for your help.

I can get it to compile now!

I did change it a little bit so that DDX can work.

in stdafx.h define like below

<br />
class CListViewCtrlImpl : public CWindowImpl<CListViewCtrlImpl, CListViewCtrl><br />
    { DECLARE_EMPTY_MSG_MAP(); };<br />

then in your class you use CListViewCtrlImpl instead of CListViewCtrl.

What method did you use to add elements to the List?

I simple demo app would be handy. please send thanks

cheers
Bryce

Re: CCheckListBox and CListBoxImpl

coge27-Nov-03 9:59

coge

27-Nov-03 9:59

I sent you a sample app with adding of elements. Let
me know if this is what you needed.

Thanks,
Clay

Re: CCheckListBox and CListBoxImpl

Michael Dunn27-Nov-03 7:19

Michael Dunn

27-Nov-03 7:19

A list box and list view control are different things. The list view has checkbox support built-in. If you want checks in a list box, you'll need to write it yourself (CCheckListBox is an MFC class, I suppose you could take that code and port it to WTL).
WTL has CCheckListViewCtrl that wraps a list view with checkboxes. Look in atlctrlx.h for its definition.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
There is a saying in statistics that a million monkeys pounding on typewriters would eventually create a work of Shakespeare. Thanks to the Internet, we now know that this is not true.

Auto completion not works?

M.Khadem25-Nov-03 22:50

M.Khadem

25-Nov-03 22:50

hi please guide me in my problem.
when I use then generated code in VC6 in a WTL program,
Paint event is like this:

<br />
OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)<br />
{<br />
CPaintDC dc(m_hWnd);<br />
<br />
    return 0;<br />
}<br />

but when i use dc. IDE dosen't show me AutoComplation Pop-up.
I need to know the reason.

oh, i know some ways to solve:
we can use something like this
CPaintDC dc=CPaintDC(m_hWnd);

but why the IDE have troble with first one? Blush | :O

STL deque problem

Bash21-Nov-03 3:12

Bash

21-Nov-03 3:12

Hi,

I'm novice in STL C++ librari, so my question will be very easy.

I have a structure, for example:

typedef struct _mystruct
{
char name[256];
bool sex;
int age;
} mystruct, *pmystruct;

I can define a class based on queue STL template:

typedef queue<mystruct, list<mystruct=""> > MEMBERS_QUEUE; // This works perfectly

But I want also define a class based on deque:

typedef deque<mystruct, list<mystruct=""> > MEMBERS_DEQUE; // This doesn't work.

I suspect that I must define allocator for mystruct... What should I do to construct own class based on deque and mystruct?

Yours sincerely,
Alex Bash

Re: STL deque problem

Roger Stewart21-Nov-03 7:03

Roger Stewart

21-Nov-03 7:03

Did you forget to include the deque header file?

#include <queue>
#include <deque>

using namespace std ;
...
// Using queue with deque
typedef deque<mystruct> MEMBERS_DEQUE;
typedef queue<mystruct> MEMBERS_QUEUE;

Roger Stewart
"I Owe, I Owe, it's off to work I go..."

STL set.h Performance Analysis

BrianReeve20-Nov-03 15:35

BrianReeve

20-Nov-03 15:35

I am looking how to measure the performance of the set.h file in the Standard Template Library. This is for a homework assignment. We are required to modify the set.h file with global integer variables to do the following:

I need to know how to count the number of compares and data moves that take place when loading N number of strings into a set or multiset. I tried to open up the set.h and increment counters in a few places, but I have no idea which functions do what. The set.h file is very confusing to me.

Any help is appreciated.

Re: STL set.h Performance Analysis

Stefan Pedersen20-Nov-03 15:52

Stefan Pedersen

20-Nov-03 15:52

Why not use the contained object instead?
Just overload constructors and the relevant operators.

And if the paths that I have followed/have tread against the flow/there is no need for sorrow
I am coming home
Return, Crüxshadows

Re: STL set.h Performance Analysis

Andreas Saurwein20-Nov-03 15:58

Andreas Saurwein

20-Nov-03 15:58

As they always say "kids, dont try this at home".

Or better, dont try this with the set which shipped with VC6.

Take the STLport (stlport.org[^]), its much more readable and is still a compatible implementation.

Finally moved to Brazil

Re: STL set.h Performance Analysis

BrianReeve21-Nov-03 9:38

BrianReeve

21-Nov-03 9:38

I wasn't modifying the original set.h file. I made a copy an placed it in my project file. I simply linked to it absolutely.

Thanks for the other resource tho! Is there a set.h (or similar header file) included in that implimentation?

If it is more readable, it will definitely help.

Thanks,

Brian

Re: STL set.h Performance Analysis

Andreas Saurwein21-Nov-03 11:20

Andreas Saurwein

21-Nov-03 11:20

BrianReeve wrote:
I wasn't modifying the original set.h file

Actually I was referring to trying to understand not to modifying the file.

BrianReeve wrote:
Is there a set.h (or similar header file) included in that implimentation?

You bet there is: <set>

Finally moved to Brazil

Re: STL set.h Performance Analysis

Joaquín M López Muñoz22-Nov-03 8:18

Joaquín M López Muñoz

22-Nov-03 8:18

You can get these estimates without modifying the source code of std::set. In order to count copying and compare operations, enrich the class you're using as element in the set like follows:

class element_set
{
public:
  static unsigned no_of_copying_ops;
  static unsigned no_of_compare_ops;
 
  element_set(const element_set& x)
  {
    ++unsigned no_of_copying_ops;
    ...
  }

  bool operator<(const element_set& x)const
  {
    ++no_of_compare_ops;
    ...
  }

  ...
};
 

unsigned element_set::no_of_copying_ops=0;
unsigned element_set::no_of_compare_ops=0;

Hope this helps, good luck.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Return value from ATL method to JavaScript variable

SlavaFromUkraine20-Nov-03 1:50

SlavaFromUkraine

20-Nov-03 1:50

Hello

I have an ATL object which I call in my JavaScript block on the page. I can pass values to methods of object by I don't know how to modify values.

I need to modify Number variable and String from the method:

This is a method of my object:

STDMETHODIMP CRsaSign::Test(int* pLen,BSTR* pStr)
{
*pLen = 1;
return S_OK;
}
[id(28), helpstring("method Test")] HRESULT Test([in,out]int* pLen,[out]BSTR* pStr);

Here is my script block:

function GenerateKey()
{
var Signature = new String(128);
var SignatureLen = new Number(54321);
objSign.Test(SignatureLen,Signature);
alert(SignatureLen);
}

In debugger I can see value *pLen = 54321 but after
I assign it 1 I see message box with previous 54321.

Maybe someone knows where to read about it or an answer Smile | :)

Thanks

Vladislav

Re: Return value from ATL method to JavaScript variable

Stefan Pedersen20-Nov-03 15:54

Stefan Pedersen

20-Nov-03 15:54

Javascript doesn't support [in, out] parameters.
If you are unable to use [retval] you are out of luck...

And if the paths that I have followed/have tread against the flow/there is no need for sorrow
I am coming home
Return, Crüxshadows

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