Re: using cout in template argument... - ATL / WTL / STL Discussion Boards

Stuart Dootson9-Feb-05 20:38

9-Feb-05 20:38

Either

add a precompiled header - add stdafx.h and stdafx.cpp to your project and compile stdafx.cpp with the option /Ycstdafx.h

OR

remove mention of the option /Yu (you'll possibly see it as /Yustdafx.h) from the compilation options of your project

HTH!!!

Stuart Dootson

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

What overloaded member function called in if(iterator)

DevendraC8-Feb-05 0:41

DevendraC

8-Feb-05 0:41

Hi,
Can anyone tell me which overloaded function is called, below in Line 2:
vector<int>::iterator it = nArray.begin(); // Line 1
if(it) //What overloaded function called here // Line 2
..................

As I know in this case overloaded (operator void *) function is called,
But I d'nt find any such overloaded function in STL iterator class.

Regards
Devendra Chandola

Re: What overloaded member function called in if(iterator)

Joaquín M López Muñoz8-Feb-05 5:22

Joaquín M López Muñoz

8-Feb-05 5:22

As you point out, there's no official procedure in the STL specification to test an iterator in such a way. What's happening is that, for vector alone, and for your particular compiler, vector::iterator happens to be an actual pointer, so the expression makes sense --it tests whether the pointer is non-null, which makes little sense in the given context. This is non-portable and you are not guaranteed that the test yield any significative result. Most likely what's intended is the following:

if(it!=nArray.end()){
  ...
}

Hope this helps,

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

Re: What overloaded member function called in if(iterator)

DevendraC8-Feb-05 17:33

DevendraC

8-Feb-05 17:33

Hi Joaquín,
Thanks for suggestion
I still want to know which overloaded function of iterator is called
when we write:

if(iterator)

Regards
Devendra Chandola

Re: What overloaded member function called in if(iterator)

guypremont9-Feb-05 3:04

guypremont

9-Feb-05 3:04

There is no general answer to your question.

Actually, you should not even ask the question because the "if (iterator)" should not generally compile. However, in your case, the magic of typedef's probably makes it valid and equivalent to "if (pointer)".

Also, the "suggestion" to do "if ( iterator == container.end() )" is NOT a suggestion: it is the only valid way to check for iterator validity.

my 2 cents...
Guy Prémont

Re: What overloaded member function called in if(iterator)

Michael Dunn10-Feb-05 10:27

Michael Dunn

10-Feb-05 10:27

DevendraC wrote:
I still want to know which overloaded function of iterator is called
when we write:

if(iterator)

Set a breakpoint on that if statement, and step into the line (F11) and you'll see.

--Mike--
LINKS~! Ericahist updated! | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD

using cout in template argument...

Malcolm Smart7-Feb-05 22:23

Malcolm Smart

7-Feb-05 22:23

Hi
I want to be able to dump a map out to any stream, ie cout, fstream, or stream into another class (the other class has the << overloaded) but I can't even pass cout into the template. I've cut the code back to the following....

typedef map<string , string> myMAP;

class MyClass
{
private:
	myMAP somedata;
public:
	void LoadSomeData(T &t) {//load map here};
	template <typename T>
	void DumpSomeData(T &t);
};


template <typename T>
void MyClass::DumpSomeData(T &t)
{
	myMAP::const_iterator iter(somedata.begin());

	while (iter != somedata.end())
		{
		t << "#" << iter->first << "#" << iter->second << endl;
		iter++;
		}
}

and to call it I use...

MyClass LoadAndDump;
LoadAndDump.LoadSomeData();
LoadAndDump.DumpSomeData(cout); <-- compiler errors....
//also tried
//LoadAndDump.DumpSomeData<std::basic_ostream<char,struct std::char_traits<char> > >(&cout);

It won't compile and gives

error C2893: Failed to specialize function template 'void __thiscall MyClass::DumpSomeData(T &)'<br />
        With the following template arguments:<br />
        'class std::basic_ostream<char,struct std::char_traits<char> > *'

Any help much appreciated.

Regards

Angel

*********************************************
The sooner you fall behind, the longer you have to catch up.

Re: using cout in template argument...

Joaquín M López Muñoz8-Feb-05 5:35

Joaquín M López Muñoz

8-Feb-05 5:35

Are you using MSVC++ 6.0? This compiler is notoriously ill-behaved when dealing with member function templates. Though I'm not 100% sure, sometimes moving the definition to the declaration of the class helps:

class MyClass{
...
  template <typename T<
  void DumpSomeData(T &t)
  {
    // put the definition here
  }
...
};

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

Re: using cout in template argument...

Malcolm Smart8-Feb-05 21:44

Malcolm Smart

8-Feb-05 21:44

Yes - using MSVC++ 6.0, and yes, moving the definition to the declaration works a treat.

Many thanks Joaquin

Angel

*********************************************
The sooner you fall behind, the longer you have to catch up.

Control's window not ready even in FinalConstruct()

greekgoddj7-Feb-05 5:21

greekgoddj

7-Feb-05 5:21

Hello,

Things only seem to get stranger everyday.

If I am not mistaken, in an ATL ActiveX Control, the aim of FinalConstruct is that by the time the program reaches there, the object has alreay been created.

however that does not seem to be the case.

In FinalConstructor() m_hWnd in the next statement is NULL.
CWnd* parent = CWnd::FromHandle(this->m_hWnd);

How can the control's window not exist after the constructor has been completed?

Placing the same statment in the OnDraw function works, but not in FinalConstruct()?

Am I missing something? Is there some sort of FinalNoReallyThisOneIsTheFinalConstruct() ? WTF | :WTF:

Thanks

Re: Control's window not ready even in FinalConstruct()

Michael Dunn7-Feb-05 7:02

Michael Dunn

7-Feb-05 7:02

greekgoddj wrote:
How can the control's window not exist after the constructor has been completed?

Because the C++ object and the window have different lifetimes. The C++ object is created before the window is. FinalConstruct() is, as the name implies, part of the construction process, so only the C++ exists when it is called.

--Mike--
LINKS~! Ericahist updated! | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD

Re: Control's window not ready even in FinalConstruct()

Jörgen Sigvardsson7-Feb-05 8:58

Jörgen Sigvardsson

7-Feb-05 8:58

Try trapping the WM_CREATE message. Or WM_INITDIALOG if you're using a dialog based window.

--
My name in Katakana is ヨルゲン.
My name in German is Jörgen.

I blog too now[^]

Re: Control's window not ready even in FinalConstruct()

greekgoddj9-Feb-05 5:42

greekgoddj

9-Feb-05 5:42

Yup....the solution is...

LRESULT CKnob::OnShowWindow(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)

Thats where the window is already created and ready. Needed to overide that and add my code inside there.

Thanks! Poke tongue | ;-P

Re: Control's window not ready even in FinalConstruct()

Anonymous17-Feb-05 3:40

Anonymous

17-Feb-05 3:40

In virtula method FinalConstruct() is control created in sense of com object. Creation of control (window) is performed in method OnCreate(...) (this is message handler of message WM_CREATE like in common window).

how to add new file to vss

JabraJabra6-Feb-05 5:42

JabraJabra

6-Feb-05 5:42

hi,
i got an add-in that creates new .cpp and .h file with templates in them.
i want that after i save the files in the project to get them into the VSS.
how can i do that?

(EnvDTE.SourceControl only got checkout functions...)

Avi.

Re: how to add new file to vss

Igor Vigdorchik6-Feb-05 12:38

Igor Vigdorchik

6-Feb-05 12:38

http://support.microsoft.com/default.aspx?scid=kb;en-us;201431[^]

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvss/html/vssauto.asp[^]

Re: how to add new file to vss

JabraJabra9-Feb-05 5:06

JabraJabra

9-Feb-05 5:06

thanks man,
but i didn't find there an answer to my question...
can u direct me further more?

Arrays in VBA

speedcat 4455-Feb-05 10:37

speedcat 445

5-Feb-05 10:37

How can i move the bottom element in an array to the top,
From

Name 1
Name 2
Name 3

to

Name 3
Name 1
Name 2

can anyone help

WTL Linker error

Franz Klein3-Feb-05 23:51

Franz Klein

3-Feb-05 23:51

I am writing an add-in for Visual Studio .NET 2003 on Windows XP SP2 that will display a dialog with a list control. However when I build the solution, I get 4 linker errors saying that some functions e.g. SetItemColor cannot be found. I have included the path to the WTL files in the properties section of the solution.

Anybody with an answer?

Cry | :((

I am the handsome one in the crowd.

Creating a CEdit in ATL ActiveX control with MFC Support?

greekgoddj3-Feb-05 22:42

greekgoddj

3-Feb-05 22:42

I have an ATl ActiveX control I am writing which has support for MFC. I want to add a CEdit in my control so that the user can enter values. How do I create this?
I have spent all yesterday (literraly) trying and no luck.

I construct by

CEdit myEdit;

Followed by

CWnd* parent = CWnd::FromHandle(this->m_hWnd);

myEdit.Create(ES_CENTER | ES_NUMBER | WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_BORDER,
CRect(10, 10, 100, 40), parent, 1);

This causes assertion...I cannot even find or understnad where the assertion is caused as when i look at the call stack in the debugger, there are no comments or ASSERT(...) around.

Has anybody sucessfully added a CEdit to an ATL ActiveX control which supports MFC? If so...how?

Thanks

Re: Creating a CEdit in ATL ActiveX control with MFC Support?

greekgoddj7-Feb-05 0:06

greekgoddj

7-Feb-05 0:06

Well...finally got this one figured out.

Must add [code]AFX_MANAGE_STATE(AfxGetStaticModuleState());[/code] before [code]CWnd* parent = CWnd::FromHandle(this->m_hWnd);
myEdit.Create(ES_CENTER | ES_NUMBER | WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_BORDER,
CRect(10, 10, 100, 40), parent, 1);[/code]

Ciao Poke tongue | ;-P

Re: Creating a CEdit in ATL ActiveX control with MFC Support?

sh1it5058-Sep-10 3:24

sh1it505

8-Sep-10 3:24

Sorry,I tried this,but still can't work,IE crashed and error is "Debug Assertion Failed"

ATL for Ole Db

lisoft3-Feb-05 15:28

lisoft

3-Feb-05 15:28

Can any one tell me how to check EOF/BOF status in a rowset?

Lisoft

Re: ATL for Ole Db

gauravjain4-Mar-05 10:43

gauravjain

4-Mar-05 10:43

Hey i had the same problem. Well there is no EOF or BOF.

Check for S_OK as till S_OK is returned EOF is not reached.

i solved it using that.

Gaurav Jain
K.K. Wagh Institue of Engineering Education and Research,
Nashik,
Maharashtra,
India.

gauravjain911@yahoo.com

Re: ATL for Ole Db

lisoft6-Mar-05 4:15

lisoft

6-Mar-05 4:15

I also found the OLE DB consumer templates does not have the EOF/BOF status like the ODBC(MFC) class which I used to access the database before. When CRowset class was first initialized by CCommand::Open method, the 'cursor' does not point to the first record like the ODBC(MFC) class. The only way to check if there is anything returned from the database is to call CRowset::MoveNext() method and check the return value to determine EOF status.

Anyway, thanks for your help.

Lisoft

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