Class Inheritance with different data types - C / C++ / MFC Discussion Boards

API for determining the file system on system disk

abhinarulkar5-Jan-03 22:26

5-Jan-03 22:26

Hi All,
I need to know a way to programmatically know how we can determine the file system on the system disk. Is there any API available which can be used to determine the file system.
Thanks and regards,
Abhishek.

Learning is a never ending process of Life.

Re: API for determining the file system on system disk

Michael Dunn5-Jan-03 22:28

Michael Dunn

5-Jan-03 22:28

Call GetVolumeInformation() - one of the things it returns is the name of the file system.

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Statusbar updating

S O S5-Jan-03 22:23

S O S

5-Jan-03 22:23

Is there a better way to updating the first pane in a MFC statusbar than just calling it's SetPaneText function when you want it changed? An UI update handler somehow?

And when exactly does MFC change it to "For help, press F1" and is it possible to change that?

Re: Statusbar updating

Iain Clarke, Warrior Programmer5-Jan-03 22:41

Iain Clarke, Warrior Programmer

5-Jan-03 22:41

If you look in tech note 27 in the Visual C++ 6 docs, it talks about WM_SETMESSAGESTRING, which is a
MFC defined message sent to the CFrameWnd. In 99% of cases, this will be CMainFrame. The handle for
this message then tells the status bar what to display. You could simply send this message yourself.

As for your second question, CFrameWnd has a handler for the WM_MENUSELECT to get the current menu
item, and extract the text from the string table.

I hope that gave you some pointers,

Iain.

A virtual keyboard

Nyrup5-Jan-03 22:17

Nyrup

5-Jan-03 22:17

Hi,
When a Win2K or XP computer waits for you to press Ctrl+Alt+Del to log on, Windows displays a virtual keyboard if you press another button.

Is it possible to display this keyboard in my own app?

Best regards
/Nyrup

Re: A virtual keyboard

Michael Dunn5-Jan-03 22:26

Michael Dunn

5-Jan-03 22:26

It's an "AVI" resource in msgina.dll Cool | :cool:

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: A virtual keyboard

Nyrup5-Jan-03 22:33

Nyrup

5-Jan-03 22:33

Hi,
Thanx for your fast answer!

An AVI..... sad... I had hoped for an interface, so I could point on other keys. I guess I don't get this feature without some effort Smile | :)

Thanks again

/Nyrup

Class Inheritance with different data types

Lord Morlock5-Jan-03 21:47

Lord Morlock

5-Jan-03 21:47

Hi all. I really need some help.

My problem is with inheritance. I have a class type that I want to use several times over for a few VERY similar structures (only 1 variable different). The class mainly contains a linked list, however I don't want to re-write many of the functions just to support the ONE different data type. I have tried doing it this way without success:

<br />
class cGeneric<br />
{<br />
public:<br />
typedef char* DataType;<br />
<br />
struct Node<br />
{<br />
DataType Id;<br />
char *pData;<br />
Node *pNext;<br />
};<br />
<br />
Node *First;<br />
public:<br />
<br />
bool AddItem(DataType Id, char *pData);<br />
<br />
...<br />
<br />
class cExtention : public cGeneric<br />
{<br />
public:<br />
typedef int DataType;<br />
<br />
struct Node<br />
{<br />
DataType Id;<br />
char *pData;<br />
Node *pNext;<br />
};<br />
<br />
Node *First;<br />

In the AddItem function, it just passes the Id (either char* or int) to another function. I know this doesn't work (it reads the information for AddItem from cGeneric since it isn't redefined in cExtention, and so therefore expects a char*) however I would like to know if there is another way to do this.

I haven't done much OOP and I find it a little difficult to swallow at times.

If anyone has ideas of how I could do this, I would greatly appreciate your feedback.

Lord Morlock
~o~

Re: Class Inheritance with different data types

Michael Dunn5-Jan-03 22:19

Michael Dunn

5-Jan-03 22:19

This is what templates were designed for. Smile | :)

template <typename DataType> class CGeneric
{
 // rest is the same...
};
 
typedef CGeneric<int> CExtension;

As long as AddItem() can deal with an arbitrary type, you're set.

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: Class Inheritance with different data types

Lord Morlock5-Jan-03 22:46

Lord Morlock

5-Jan-03 22:46

Thanks heaps! I knew there'd be a way... I just don't have any class oriented books for C++ atm Smile | :)

.

One more question, I assume templates are C++, not just MS?

Thanks again.

Lord Morlock
~o~

Re: Class Inheritance with different data types

Michael Dunn6-Jan-03 22:17

Michael Dunn

6-Jan-03 22:17

Lord Morlock wrote:
One more question, I assume templates are C++, not just MS?

That's correct.

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Want to know version of Windows running

nashdaq5-Jan-03 20:57

nashdaq

5-Jan-03 20:57

Please help me with this situation that I have. How can I detect which version of Windows is running, that is , is Windows 95, 98 ,2000, ME, XP or NT is running? Smile | :)

Regards
Nashdaq

Re: Want to know version of Windows running

Michael Dunn5-Jan-03 21:03

Michael Dunn

5-Jan-03 21:03

Call GetVersionEx(), which fills in a struct with the version numbers and 9x/NT flag. MSDN has a table showing which version corresponds to 95, 98, etc.

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Showing a Dialog Box!

Ehsan Baghaki5-Jan-03 20:50

Ehsan Baghaki

5-Jan-03 20:50

hi i am new to Visual C++.Net.
i am uing a Document Window and it's needed to show some information to user Such as Score.
to aim this i have to Show a Dialog Box and Show this information on it.
i don't know which kind of Dialog box is UseFul for this reason (i mean i use this Dialog box only for Monitoring the information)

i know that i have to Creat a Class for that Dialog and then Creat a Variable of it and set Var.DoModal(); but it's not work can someone help me ?

-=Ehsan-de-Burge=-

Re: Showing a Dialog Box!

xxhimanshu5-Jan-03 21:22

xxhimanshu

5-Jan-03 21:22

i haven't worked on vs.net but in vc++ vs6.0 we do it like this::

1: add a dialog to the resource.

2: using classwizard add a class to this dialog resource.

3: in initinstance() write
CDialog1 dlg;
dlg.domodal();

4: or whereever you need this code i.e. if yo want to show this dialog at click of an button add this code to the message handler of that button's click event.

that's it.
i hope you get an idea of how to proceed.
cheers..

Himanshu

Re: Showing a Dialog Box!

Ehsan Baghaki5-Jan-03 21:47

Ehsan Baghaki

5-Jan-03 21:47

thanks for your answer. if i use a Dialog as CDialog Base Class then i can't use this Dialog for Moitoring the information. i want to Use a Dialog for monitoring (so the Focus is always Set on the Main Window and this Dialog never Gets Focus)

may be using Dialog for this reason is wrong. what should i do ?

how can i text out some text to a bitmap ?

whelk5-Jan-03 20:07

whelk

5-Jan-03 20:07

my question:

in my app,i want to print some text by a bitmap.and the text is dynamiclly changed when printing .

now i want to do so:

build a temporary bitmap, load the bitmap and text out some text to the
bitmap ,and save bitmap .then if i use ACDSEE to look at the bitmap we can find the text in the bitmap;

but how can i do ?i want to programe a general function;

bool TxtToBitmap(CString &strBmpFile,CString &strOutputText)

then after i use the function ,i want the strBmpFile can include the strOutputText

who can help me?thanks!!

-----------------------------
Mr.Whelk
-----------------------------
Zhuhai City ,Guangdong ,China

Re: how can i text out some text to a bitmap ?

Davide Pizzolato11-Jan-03 9:15

Davide Pizzolato

11-Jan-03 9:15

at www.aoi.it, there is cximage (v5.50) with a DrawText method.

detecting system shutdown

r i s h a b h s5-Jan-03 19:33

r i s h a b h s

5-Jan-03 19:33

dear all,
i want my mfc dialog based application to detect system shutdown.
is there any way to do it?

thanx

Re: detecting system shutdown

Michael Dunn5-Jan-03 20:23

Michael Dunn

5-Jan-03 20:23

Handle the WM_ENDSESSION message, you can examine the parameters to tell if it's a shutdown or just the user logging off.

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

GetWindowText() problem!!!!!!!!!!!!!!!!!!!!!

xxhimanshu5-Jan-03 18:21

xxhimanshu

5-Jan-03 18:21

(hi,
I used following lines of codes::
CString strEdit;
GetWindowText(strEdit);
but it is giving an error as ATL::GetWIndowTextA() cannot convert parameter 1 from Cstring to unsigned short**. But when I type it is asking for a Cstring only.

can anyone help me out!!!!!!!Please...

Himanshu

Re: GetWindowText() problem!!!!!!!!!!!!!!!!!!!!!

Michael Dunn5-Jan-03 20:31

Michael Dunn

5-Jan-03 20:31

The ATL function CWindow::GetWindowText() doesn't work with CStrings, since CString is MFC. You need to pass a BSTR or a CComBSTR (easier to use, it handles memory management for you).

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: GetWindowText() problem!!!!!!!!!!!!!!!!!!!!!

xxhimanshu5-Jan-03 22:42

xxhimanshu

5-Jan-03 22:42

thanks a lot Mike. It worked.
cheers..

Himanshu

Assembler designing in VC++

Sukhdeep5-Jan-03 17:25

Sukhdeep

5-Jan-03 17:25

Hi,

I want to design a 8086 Assembler in VC++ for my college Project. Please tell me which book I should follow to design the Assembler .Please Help me.

Help with Header files.

VanHlebar5-Jan-03 15:56

VanHlebar

5-Jan-03 15:56

I have a dll that includes a particular header file. In my main application code it too uses the same same header file. When I include the header file for my dll it tries to inclue the header file twice. How do I get the compiler to only include the file if it has not already been loaded?

Example:

DLL.h File -
#include "Myheader.h"

MainApp.h File -
#include "Myheader.h"
#include "DLL.h"

Thanks for the help,
-Eric

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