C / C++ / MFC

T.RATHA KRISHNAN21-Jun-07 2:14

T.RATHA KRISHNAN

21-Jun-07 2:14

fstream ofs("studfile.txt",ios::out);

This is the statement I'm using to open the file. If I use app in place of out, the file is not opened. But I want the contents of the files don't get erased after each execution.

David Crow21-Jun-07 2:24

21-Jun-07 2:24

T.RATHA KRISHNAN wrote:
If I use app in place of out...

Why aren't you using both?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

David Crow21-Jun-07 2:24

21-Jun-07 2:24

Steve S wrote:
...or STD streams?

STL?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Jhony george21-Jun-07 2:11

Jhony george

21-Jun-07 2:11

open the file in apppend mode...
syntax...
modes for opening a file----->
fstream file_op("C:\\s1.txt ",ios::out|ios::app);

T.RATHA KRISHNAN21-Jun-07 2:20

T.RATHA KRISHNAN

21-Jun-07 2:20

Thanks Mani. It's working.

error C2027: use of undefined type 'IActiveDesktop'

Hamid_RT21-Jun-07 2:33

Hamid_RT

21-Jun-07 2:33

See CTextfile: A handy helper [^] does helpful?

WhiteSky

neha.agarwal2721-Jun-07 1:37

neha.agarwal27

21-Jun-07 1:37

Hi all,

I am trying to use IActiveDesktop interface in my code.
I have included

#include "shlobj.h"

and defined this in stdafx.h

#import "shell32.dll"

but it is giving error

error C2027: use of undefined type 'IActiveDesktop'

how to resolve this

Can anybody help me in this
thanks in advance

Re: error C2027: use of undefined type 'IActiveDesktop'

Steve S21-Jun-07 2:11

Steve S

21-Jun-07 2:11

You could try

#include <wininet.h>
#include <shlobj.h>

as I believe there are things in shlobj.h that rely on wininet.h being included first.

After that, you might also consider that by default, #import generates definitions inside a namespace, so if that was where IActiveDesktop was being defined, it wouldn't be in the global namespace.

You can look at the generated tli/tlh files to see what the namespace is called.

Steve S
Developer for hire

Re: error C2027: use of undefined type 'IActiveDesktop'

Hamid_RT21-Jun-07 2:34

Hamid_RT

21-Jun-07 2:34

See Introduction to COM - What It Is and How to Use It. [^] on that article Michael used of IActiveDesktop.

WhiteSky

Re: error C2027: use of undefined type 'IActiveDesktop'

David Crow21-Jun-07 2:36

Re: error C2027: use of undefined type 'IActiveDesktop'

21-Jun-07 2:36

See here.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

neha.agarwal2721-Jun-07 2:50

neha.agarwal27

21-Jun-07 2:50

thanku all,

it solved my problem....

VS.NET Error ?

baerten21-Jun-07 1:28

baerten

21-Jun-07 1:28

Hi everybody,

like some times before i have a very strange behavior:

I add lines to the header : Error
I switch some lines : No Error

Now i have a same case:

class MyView
{
  DECLARE_DYNCREATE(.....
  
  public:
     MyView(....
     ~MyView();
  public:
     enum { IDD = IDD_MY_VIEW };

  #ifndef _DEBUG
   ...
  #endif

  public:
     virtual void DoDataExchange(...
     DECLARE_MESS...

     CFontStatic lbInfo;
     CButton btOk;
     CSxGroupBox gbSelect;
     CFontStatic lbOne;
     CFontStatic lbTwo;
     CFontStatic lbThree;
     CFontStatic lbFour;

i get an error during the SubClassing of lbOne during DoDataExchange

CFontStatic lbInfo;
CButton btOk;
CFontStatic lbOne;
CFontStatic lbTwo;
CFontStatic lbThree;
CFontStatic lbFour;
CSxGroupBox gbSelect;

NO ERROR

CSxGroupBox gbSelect;
CFontStatic lbInfo;
CButton btOk;
CFontStatic lbOne;
CFontStatic lbTwo;
CFontStatic lbThree;
CFontStatic lbFour;

I get an error during AfxCallWndProc

CStatic gbSelect;
CFontStatic lbInfo;
CButton btOk;
CFontStatic lbOne;
CFontStatic lbTwo;
CFontStatic lbThree;
CFontStatic lbFour;

If i replace CSxGroupBox with CStatic i also get NO ERROR

D'Oh! | :doh:

i don't really understand how this effect occurs.
The View "MyView" does nothing, no char array which could overflow
And there are also no other views/funtions before the opening of this MyView
which manipulates arrays or other operations which could provoke an overflow

Does any one know the problem or has some times the same effect?

Big thanks !

Re: VS.NET Error ?

Matthew Faithfull21-Jun-07 5:55

Matthew Faithfull

21-Jun-07 5:55

Just a guess but I'd say CSxGroupBox is overwriting memory that doesn't belong to it, probably in the constructor. That's where I'd look to start with.

Just a tip: Calling your post VS.NET error makes it sound like a problem with .NET which belongs in the .NET forum or a problem with Visual Studio which belongs in the Visual Studio forum. This might explain the slight lack of response. Dialog crashes in DataExchange or C++ Subclassing problem might have been more appropriate. Wink | ;)

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: VS.NET Error ?

baerten21-Jun-07 21:27

baerten

21-Jun-07 21:27

Ok, i will check the code of CSxGroupBox

Thanks for your help Rose | [Rose]

protecting file

deeps_cute21-Jun-07 0:58

deeps_cute

21-Jun-07 0:58

hi i am copying a file to user desktop. the user should not edit or open or delete the file. how to do this in mfc.

-- modified at 7:17 Thursday 21st June, 2007

Arise Awake Stop Not Till ur Goal is Reached.

Re: protecting file

David Crow21-Jun-07 2:40

About CFileDialog toobar icon color

21-Jun-07 2:40

deeps_cute wrote:
how to do this in mfc.

Change the file's access permissions via the ACL. The solution has nothing to do with MFC.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

throne88821-Jun-07 0:25

throne888

21-Jun-07 0:25

I have a project used CFileDialog, the icon color is just 16 colors, but in another project it is 256 color icon.Does anyone know how to make CFileDialog to show 256 color icon?

Thanks!

Mark Salsbery21-Jun-07 6:14

Mark Salsbery

21-Jun-07 6:14

What icon? CFileDialog wraps the Windows common file open/save dialog. What icons are involved
with that?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

throne88821-Jun-07 14:52

throne888

21-Jun-07 14:52

What I mean is the toolbar button: Up One Level, Create New Folder and View Menu button.These buttons are 16 colors, but in office word, excel they are 256 colors.

Mark Salsbery21-Jun-07 15:17

Mark Salsbery

21-Jun-07 15:17

The dialog in Office is customized. For info on customizing these dialogs, see
Open and Save As Dialog Boxes[^]

I'm not sure how much is documented about changing the explorer-style dialogs, especially the
toolbar.

On XP, if you add themes to your app with the appropriate manifest, you'll get the look identical
to the file/open dialog in IE...see
Add Windows XP Theme Style to your current projects[^]

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder