ATL / WTL / STL Discussion Boards

SimpleProgramer28-Jun-05 0:56

28-Jun-05 0:56

I wish to add single string to the start of a file.
I used:

_file.seekp(0); // move to start of file
_file << something << std::end;

It overrides the text in start of file, but I wish to insert before current text.

Does anyone know how to do it?

THANKS!

Keep it simple

Re: ofstream adding in start of file

CP Visitor28-Jun-05 6:57

CP Visitor

28-Jun-05 6:57

SimpleProgramer wrote:
I wish to add single string to the start of a file.
I used:

_file.seekp(0); // move to start of file
_file << something << std::end;

It overrides the text in start of file, but I wish to insert before current text.

Does anyone know how to do it?

There is nothing before 0 (which is even a philosophical answer Suspicious | :suss:

). Hint: You can write a new file ....

STL Deque problem...again !

mmagnani7127-Jun-05 23:27

mmagnani71

27-Jun-05 23:27

Hi Guys.

I have a problem about the max dimension of an element that can be used with the container "deque" defined in STL.
I declare a deque typedef with elements of 2049 bytes (but could be everykind of data or class) :

typedef struct
{
char stringa[2049];
} t_Elem;

typedef deque <t_elem> t_Queue;

I populate an instance of this deque with 5 strings :

t_Queue stQueue;
t_Elem stElem;
//
strcpy (stElem.stringa, "Stringa1");
stQueue.push_back (stElem);
strcpy (stElem.stringa, "Stringa2");
stQueue.push_back (stElem);
strcpy (stElem.stringa, "Stringa3");
stQueue.push_back (stElem);
strcpy (stElem.stringa, "Stringa4");
stQueue.push_back (stElem);
strcpy (stElem.stringa, "Stringa5");
stQueue.push_back (stElem);

Then I try to navigate inside deque, using a standard iterator :

t_Queue::iterator p = stQueue.begin();
while (p != stQueue.end())
{
t_Elem localElem;
strcpy (localElem.stringa, ((t_Elem)(*p)).stringa);
p++;
}

But the stQueue.end() operator doesn't stop my loop after 5 cycles !!!! ... then an Access Violation occour when I use the sixth element of deque.

The strange thing is that if I DECLARE the ' t_Elem' string of 2048 bytes instead of 2049, everything's OK !!!

I know that I could solve the problem using string container instead of pure char[204?] data, but the problem occour even if I declare as element a class that has 2049 bytes of data.
I can navigate through deque using a "for (short i=0; i

Re: STL Deque problem...again !

Stuart Dootson28-Jun-05 21:36

Stuart Dootson

28-Jun-05 21:36

Use a std::string (or even a std::vector<char>) rather than an array of characters?

Stuart Dootson

'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'

Re: STL Deque problem...again !

mmagnani7128-Jun-05 22:54

mmagnani71

28-Jun-05 22:54

The point of the problem is not "use another class to store string". The problem also occour if I use whatever else element 2049 bytes long. Think for example to a Class with members and methods bigger than 2049 bytes.

But I've got an update. Go to here :

http://www.dinkumware.com/vc_fixes.html

Download the new <deque> header and follow instructions. This fixes the problem. There are also many bug fixes about other STL containers... This Site has been signaled me by Paul McKenzie, Elite Member on the CodeGuru Forum Site.

Problem's now solved. Bye to all, Mirko.

Problems with toolbar when using TBSTYLE_EX_MIXEDBUTTONS

retro_coder27-Jun-05 21:43

retro_coder

27-Jun-05 21:43

Hi,

I have a toolbar where I dynamically create the buttons. It uses the TBSTYLE_EX_MIXEDBUTTONS style. Everything seems to work fine, however when I resize my window, there is no drop-down on the RHS ( ">>" ) to access the buttons that have been clipped.

Buttons without text work fine. Obviously I am missing something. Here is my code to create the rebar:

<br />
    HWND hWndCustomToolBar = CreateSimpleToolBarCtrl(m_hWnd, IDR_CUSTOM, FALSE, ATL_SIMPLE_TOOLBAR_PANE_STYLE  | TBSTYLE_LIST & ~TBSTYLE_TOOLTIPS);<br />
    CToolBarCtrl = hWndCustomToolBar;<br />
    m_customToolbar.SetImageList(*m_sysImageList.GetImageList());<br />
    m_customToolbar.SetExtendedStyle(TBSTYLE_EX_MIXEDBUTTONS);<br />
    m_customToolbar.SetMaxTextRows(1);<br />
    m_customToolbar.AutoSize();<br />
    CreateSimpleReBar(ATL_SIMPLE_REBAR_NOBORDER_STYLE);<br />
    AddSimpleReBarBand(hWndCustomToolBar, NULL, TRUE);<br />

Then to add my buttons I use the following styles:

<br />
    button.fsState |= TBSTATE_ENABLED;<br />
    button.fsStyle |= TBSTYLE_AUTOSIZE | BTNS_SHOWTEXT;<br />
    m_customToolbar.AddButtons(1, &button);<br />

Is there anything else I need to do?

Thanks in advance.

STL Notation

Jack Puppy27-Jun-05 17:20

Jack Puppy

27-Jun-05 17:20

Is there a standard notation in use for STL containers/iterators? If not, what are you people using?

For example,

<br />
typedef vector<Blah> BlahArray;<br />
<br />
typedef vector<Blah>::iterator iBlahArray;<br />
typedef vector<Blah>::const_iterator ciBlahArray;<br />
typedef vector<Blah>::reverse_iterator riBlahArray;<br />
typedef vector<Blah>::const_reverse_iterator criBlahArray;<br />

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Re: STL Notation

Christian Graus27-Jun-05 18:17

Christian Graus

27-Jun-05 18:17

I don't use the typedef thing at all, I think it's ridiculous, and there are better ways to obsfucate ones code, if you really want to.

Christian Graus - Microsoft MVP - C++

Re: STL Notation

Douglas Troy1-Jul-05 7:01

Douglas Troy

1-Jul-05 7:01

I don't typedef my STL containers, I typically declare them as one might a variable; encapsulated in a class.

<br />
class MyIntClass<br />
{<br />
  ....<br />
<br />
private:<br />
     list<int> intList;<br />
     list<int>::const_iterator intListIterator;<br />
<br />
  ....<br />
  <br />
};<br />

Maybe a better question is what is the advantage of one over the other, then apply that to your programming situation ...

:..::. Douglas H. Troy ::..

Fold with us|Development Blogging|viksoe.dk's site

does BHO have max memory limit?

petevam26-Jun-05 23:11

petevam

26-Jun-05 23:11

Sorry -I posted this to C++ forum but it may be more appropriate here. Smile | :)

Hi,

I've trying to create a browser helper object (BHO) for explorer. I've got a main "manager" class that initializes two objects. Each of these uses an simple XML parser (using MSXML). Now, when parsing XML files, I want to store the results to a struct array (not a class). The struct array is in turn comprised of a few other struct arrays. All mem allocation is static, only the topmost parent struct array is dynamically allocated. That's where the problem is: When I allocate (using new) the struct arr in the first object, its ok. Then when I init the second obj, the new fails and crushes the explorer. I did a simple test in the second obj:

int *i = new int[x];

when x is <255 it's ok. if x>=255 then it crashes (and of course, my struct arr is bigger than 255*sizeof(int) bytes). I don't think I have any serious mem leaks in the code before this.

Has anyone seen this before? Is there a memory limit imposed by explorer (unlikely as it sounds)? I would appreciate any comments.

Thanks,
Pete

Re: does BHO have max memory limit?

Douglas Troy27-Jun-05 4:47

Douglas Troy

27-Jun-05 4:47

Pete -

I've not implemented a BHO, but I have fairly good book called Programming Internet Explorer 5 from Microsoft Press (ISBN 0-7356-0781-8).

The last chp in the book covers BHO and I see no references to memory constraints or the like.

I found this write-up on MSDN
Browser Helper Objects: The Browser the Way You Want It[^]

This also does not indicate memory restrictions ...

:..::. Douglas H. Troy ::..

Fold with us|Development Blogging|viksoe.dk's site

Re: does BHO have max memory limit?

petevam27-Jun-05 6:20

petevam

27-Jun-05 6:20

I thought that it would be like this. Still, I can't understand why I cannot exceed a limit when allocating memory (except if I have a really serious leak -but when IE is loading, memory consumption looks normal).

Thanks.

DS_FIXEDSYS in WTL project VS2005

vassilux@26-Jun-05 4:18

vassilux@

26-Jun-05 4:18

I ported my VS2003 PocketPC WTL project to VS2005 and I have the problems
with resources.
When I modify a Dialog in my resource editor I get an error

Error 1 error RC2104 : undefined keyword or key name: DS_FIXEDSYS

Any idea?
Cry | :((

Thanks

Re: DS_FIXEDSYS in WTL project VS2005

toxcct26-Jun-05 5:19

toxcct

26-Jun-05 5:19

what is DS_FIXEDSYS supposed to be ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: DS_FIXEDSYS in WTL project VS2005

Jörgen Sigvardsson26-Jun-05 5:59

Jörgen Sigvardsson

26-Jun-05 5:59

Winuser.h reveals:

#if(WINVER >= 0x0400)
#define DS_FIXEDSYS         0x0008L

Good music: In my rosary[^]

Re: DS_FIXEDSYS in WTL project VS2005

vassilux@26-Jun-05 9:03

vassilux@

26-Jun-05 9:03

Thanks so much Jörgen

storing of struct in vector

itkid23-Jun-05 19:55

itkid

23-Jun-05 19:55

Hi,
I have to store 10 strcture in vector.
struct
{
int
int
int
int
};
Can you please help me. I am new to stl programming.

Thanks

Re: storing of struct in vector

toxcct24-Jun-05 0:35

toxcct

24-Jun-05 0:35

use the <pre> tag to format your post correctly, b'cause we can't see anything on your question.

moreover, what is exactly your request ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: storing of struct in vector

Nathan Addy26-Jun-05 6:03

Nathan Addy

26-Jun-05 6:03

Vectors can hold pretty much anything with a name, so if you have your struct defined like:

struct myStructure {<br />
int one;<br />
int two;<br />
int three;<br />
int four;<br />
};

then just define a vector of myStructs like so:

vector<myStructure> myVector;<br />
myVector.push_back(firstStructure); //and so on

then you can just access your data like you would with a basic array, ie

myStructure temp;<br />
temp=myVector[5];

or you can modify in place like

myVector[5].one=37;

Pretty cool stuff.

GDI+, SetWorldTransform and transformation of objects

flamy23-Jun-05 17:57

flamy

23-Jun-05 17:57

Hi, all!
I'm writing scatter plot program and it, uses function SetWorldTransform() to map coordinate space of whatever data I send to it onto coordinate space of the screen. The function works well, but as well as transforming coordinate space, it transforms objcects(which I draw using GDI+) in it, and I don't need that.

Is there a way to bypass transformation of graphics objects by means of GDI+ or is there any other function that does just that?

Using templates for selecting overloaded functions

ComplexLifeForm23-Jun-05 3:10

ComplexLifeForm

23-Jun-05 3:10

Hi,

I want to use templates to select one of the overloaded functions, basically I am looking for something like this

template<int v>
struct Int2Type
{
enum { value = v };
};

void Function(Int2Type<0>)
{
cout << "Function with Int2Type<0> selected"; -------------- (1)
}

void Function(Int2Type<1>)
{
cout << "Function with Int2Type<0> selected"; -------------- (2)
}

int main()
{
int iselect = GetValue();

Function(Int2Type<iselect>()); // selects (1) if iselect = 1 else selects (2)
// if iselect = 2
return 0;
}

My question is, Whether it is possible to write such a code? Or can someone suggest how to achieve the desired functionality.

Thanks in advance

Re: Using templates for selecting overloaded functions

Joaquín M López Muñoz23-Jun-05 11:37

Joaquín M López Muñoz

23-Jun-05 11:37

You cannot do that: the basic problem is that overload selection takes place at compile time, whereas your iselect value is only known at run time.

So, you need some kind of dynamic dispatch framework to achieve what you're after. The following is a possibility (lacking the terseness of function overloading):

typedef void (* function_t)();
 
void function0(){...}
void function1(){...}
 
function_t function[]={&function0,&function1,...};
 
int main()
{
  int iselect=GetValue();
  function[iselect]();
}

Hope this helps.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!

Automatically scroll a view when using drag and drop

retro_coder22-Jun-05 23:34

retro_coder

22-Jun-05 23:34

Hi,

I managed to implement some basic drag and drop support in my Tree Control by following the article: http://support.microsoft.com/default.aspx?scid=kb;en-us;214814 on the microsoft site.

However, I'd now like to implement automatic scrolling when the user moves the cursor to the top or end of the view. How would I go about doing this? Can anyone point me to some information?

Thanks in advance.

Sink Event Problem- Please Help

Raj72321-Jun-05 17:07

Raj723

21-Jun-05 17:07

Hi guys, I wrote a ATL program (an addin) for MS Word using the article provided by Amit Dey on Outlook addins. It works fine. but the sink events only work for a single instance of Word. i want my application ( and the Sink Events) to function with multiple instances of Word. Can someone help me out? I'm not really sure what the problem is. My command bars are created on all instances of Word but nothing happens when i click them.

This how i implemented my sink event (just like Amit did it):

ATL_FUNC_INFO OnClickButtonInfo =
{CC_STDCALL,VT_EMPTY,2,{VT_DISPATCH,VT_BYREF | VT_BOOL}};

void __stdcall CAddin::OnClickButton(IDispatch*
/*Office::_CommandBarButton* */ Ctrl,
VARIANT_BOOL * CancelDefault)
{
USES_CONVERSION;
CComQIPtr<office::_commandbarbutton> pCommandBarButton(Ctrl);
//the button that raised the event. Do something with this...
MessageBox(NULL, "Clicked Button1", "OnClickButton", MB_OK);

}

Please help me with my difficulty.
Thanks

A combined Tree View and List View control?

retro_coder20-Jun-05 20:45

retro_coder

20-Jun-05 20:45

Hi,

I was wondering if anyone knows of a combined Tree and List view control for WTL?

The UI I want to create is a list view with three columns. The first column contains the Tree View items and the second and third columns contains properties of each tree item, which are displayed as check boxes.

Thanks in advance.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.