C / C++ / MFC

Functions pointed to by objects using Dynamic cast

6-Mar-08 2:19

Since you have to adapt different pieces of code, IMHO the best approach is to uniform the whole project to generic text mappings [^], as already suggested by toxcct. It should be not such a daunting task (hopefully).
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

sp->tj6-Mar-08 0:11

sp->tj

6-Mar-08 0:11

When I run the program the output is:
Foo of derived 2
Foo of derived 2
Foo of derived 2
Why is it so? Shouldnt the output be:
Foo of derived 2
Foo of derived
Foo of base

#include<iostream.h>

class CBaseX
{
public:
virtual void foo()
{
cout<<" Foo of base";
}
};

class CBaseY:public CBaseX
{
public:
void foo()
{
cout<<" Foo of derived";
}
};
class CBaseZ:public CBaseY
{
public:
void foo()
{
cout<<" Foo of derived 2";
}
};

void main()
{
CBaseX* bx = new CBaseZ();
bx->foo();

CBaseY* by=dynamic_cast<CBaseY*>(bx);
by->foo();

CBaseX* bx1=dynamic_cast<CBaseX*>(bx);
bx1->foo();
}

Re: Functions pointed to by objects using Dynamic cast

Rajkumar R6-Mar-08 0:13

Rajkumar R

6-Mar-08 0:13

because

Member 4090406 wrote:
virtual void CBaseX::foo()

foo is virtual function

Re: Functions pointed to by objects using Dynamic cast

CPallini6-Mar-08 0:14

connect to SQL server via the internet

6-Mar-08 0:14

Nope. The output is correct. That's all the magic of polymorphism.
Smile | :)

realtimeforme6-Mar-08 0:04

realtimeforme

6-Mar-08 0:04

Hi all,
I need to use SQL server via the internet in C++ app, 2 questions:

1) what info do I need? such as domain name, ip address, database name etc.

2) actural C++ code or C++ samples

thx

How to fix the cursor

savitri6-Mar-08 0:02

savitri

6-Mar-08 0:02

hi everyone,
i am savitri here.i am having one more problem that is how to set the cursor to the first block or first text bor in the form. like in VB we use set focus and get focus but how to do in VC++. please help me out.
thanku in advanced,
savitri Unsure | :~

Rajkumar R6-Mar-08 0:08

Rajkumar R

6-Mar-08 0:08

SetFocus() GetFocus().

CPallini6-Mar-08 0:12

6-Mar-08 0:12

SetFocus function [^] if you're using Win32 API or SetFocus method [^] if you're using MCF.
Smile | :)

Rajesh R Subramanian6-Mar-08 0:46

6-Mar-08 0:46

CPallini wrote:
if you're using MCF.

That must be one cool technology. Big Grin | :-D

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

toxcct6-Mar-08 0:51

toxcct

6-Mar-08 0:51

hey, have you noticed ?

he's now coding with MFC, but 2 days ago, he was asking how to write a switch statement !

wooowwwww, this guy is learning damn fast, hey ! Roll eyes | :rolleyes:

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Rajesh R Subramanian6-Mar-08 0:56

6-Mar-08 0:56

toxcct wrote:
he's now coding with MFC, but 2 days ago, he was asking how to write a switch statement !

BTW, it's a girl and not a guy. (Assumed from the display name)

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

CPallini6-Mar-08 0:54

6-Mar-08 0:54

It's a framework.
Laugh | :laugh:

Rajesh R Subramanian6-Mar-08 0:58

6-Mar-08 0:58

ROTFL. You're such a bad guy.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

toxcct6-Mar-08 0:18

toxcct

6-Mar-08 0:18

savitri wrote:
am savitri here.i am having one more problem

déja vu

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Rajkumar R6-Mar-08 1:26

Rajkumar R

6-Mar-08 1:26

ROTFL

El Corazon6-Mar-08 5:52

El Corazon

6-Mar-08 5:52

savitri wrote:
i am having one more problem

I am holding my breath waiting for the next one....

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

Mark Salsbery6-Mar-08 6:24

Mark Salsbery

6-Mar-08 6:24

We all are Jig | [Dance]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

El Corazon6-Mar-08 11:58

El Corazon

6-Mar-08 11:58

Mark Salsbery wrote:
We all are

at least we never have to hold it for long!

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

Rajesh R Subramanian6-Mar-08 20:27

6-Mar-08 20:27

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Rajesh R Subramanian6-Mar-08 8:04

6-Mar-08 8:04

Next time it's not gonna be easy man!

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

savitri7-Mar-08 23:21

savitri

7-Mar-08 23:21

hello everyone,
i am facing the same problem... my text box variable are m_memid,m_memname, m_balance and m_date for thie i have to fix the cursor and text... how shall i do it please give some solutions please..as we do in VB like txtmemid.text and so on.. if i compile the program line by line then values are there in memory but they are not printing in the text boxes.. please help me out

THANKU IN ADVANCE,
savitri, OMG | :OMG:

Com Port Read [modified]

shakumar_225-Mar-08 23:21

shakumar_22

5-Mar-08 23:21

Hi
In my programme VC++6.0 ATL COM, i used Com port Writing(output) through Com Port is done .But Reading(input) through Com port was not working Proberly.

Com Port Reading Function

OVERLAPPED comReader = { 0 };
BOOL fWaitingOnRead = FALSE;
char * lpBuf = "";
DWORD dwRead = 0; // bytes actually read
BOOL Success;
FILE* FilePtr;
DCB dcb = {0};
DWORD dwCommEvent;
COMMTIMEOUTS CommTimeOuts;
HANDLE hCommPort;

printf(" Inside CommThreadProc \n" );
//Opening the COM port
hCommPort = CreateFile( "COM1",GENERIC_READ,0,0,
OPEN_EXISTING,FILE_FLAG_OVERLAPPED, 0 );

if( hCommPort == INVALID_HANDLE_VALUE )
{ printf( "Error while Opening COM Port \n" );
return ;
}
//Getting COMM settings
GetCommState( hCommPort, &dcb );
dcb.BaudRate = CBR_9600;
dcb.ByteSize = 8;
dcb.Parity = NOPARITY;
dcb.StopBits = ONESTOPBIT;
SetCommState( hCommPort, &dcb );
//Creating overlapped event handle
comReader.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
SetCommMask( hCommPort, EV_RXCHAR );
BOOL repeat = true;

while( 1 )
{ WaitCommEvent( hCommPort, &dwCommEvent, &comReader );
if( WaitForSingleObject( comReader.hEvent, INFINITE ) == WAIT_OBJECT_0 )
{ do
{ Success = ReadFile( hCommPort,&lpBuf,512,&dwRead,&comReader );
if( !Success )
if (GetLastError() == ERROR_IO_PENDING)
printf( "Error in reading the file \n");
else
{ // writing the data into a file
FilePtr = fopen( "comport.txt", "a+" );
if( FilePtr != NULL )
fwrite( &lpBuf, dwRead, 512, FilePtr );
else
printf( "Error while opening file" );

fclose( FilePtr );
}
}while( dwRead > 0 );

}
}

CloseHandle( comReader.hEvent );
CloseHandle( hCommPort );

In message box i receive something but mesage was blank.
i try to write the received data in to "comport.txt" file but it is not working.

I want to write the receving data in txt file,receving data was an character eg:"ff fe ".

thanks

by
shakumar

shakumar

modified on Friday, March 7, 2008 1:07 AM

Re: Com Port Read

CPallini5-Mar-08 23:29