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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~
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This is what templates were designed for. 
template <typename DataType> class CGeneric
{
};
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My really out-of-date homepage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
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Thanks heaps! I knew there'd be a way... I just don't have any class oriented books for C++ atm .
One more question, I assume templates are C++, not just MS?
Thanks again.
Lord Morlock
~o~
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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My really out-of-date homepage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
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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?
Regards
Nashdaq
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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
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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=-
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 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
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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 ?
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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
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at www.aoi.it, there is cximage (v5.50) with a DrawText method.
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dear all,
i want my mfc dialog based application to detect system shutdown.
is there any way to do it?
thanx
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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
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 (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
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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
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 thanks a lot Mike. It worked.
cheers..
Himanshu
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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.
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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
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The standard way to prevent multiple inclusion of a header file is to add this in each .h file. This example depicts foo.h.
#ifndef foo_h
#define foo_h
...
#endif
/ravi
Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com
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Ok.. I found it.
Needed to use #if !defined and #endif in the header file. 
-Eric
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In Myheader.h:
#ifndef MYHEADER_H_INCLUDED
#define MYHEADER_H_INCLUDED
#endif There is also the #pragma once command, however I prefer the #ifdef method so that I can test for the presence of the symbol to tell whether a header has been included.
--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
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Hi all,
I was wondering...
How can you give the desktop or taskbar the keyboard focus? 
I know there is an SetFocus function but that only works for a window that's your app own.
Aidman » over and out
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In the Platform SDK for SetFocus, it includes the following sentence:
By using the AttachThreadInput function, a thread can attach its input processing to another thread. This allows a thread to call SetFocus to set the keyboard focus to a window attached to another thread's message queue.
Which should help you get around the (deliberate) limitation. You could always detach straight after.
Iain.
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But how can I get the Thread handle of the Desktop or Taskbar wich need to attach to?
Aidman » over and out
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GetWindowThreadProcessId should give you the information you need.
Iain.
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