Re: Class wizard problem - C / C++ / MFC Discussion Boards

Re: why runtime error? what is difference?

prasad_som5-Sep-05 19:27

prasad_som

5-Sep-05 19:27

define one assignment operator, will be similar to copy constructor. it get called at line t3=s1+s3

Re: why runtime error? what is difference?

Giannakakis Kostas5-Sep-05 20:06

Giannakakis Kostas

5-Sep-05 20:06

You haven't overloaded the = operator, needed for the second version. This is a simple implementation:

string operator=(const string &s)<br />
{<br />
    delete p;<br />
    p = new char[strlen(s.p) + 1];<br />
    strcpy(p, s.p);<br />
    return *this;<br />
}

I also recommend to rename your class to myString or something like that.

Re: why runtime error? what is difference?

G Haranadh5-Sep-05 21:04

G Haranadh

5-Sep-05 21:04

Thanks for both of you for replying. Rose | [Rose]

Nice talking to you. Blush | :O

-- modified at 3:05 Tuesday 6th September, 2005

Re: why runtime error? what is difference?

toxcct5-Sep-05 21:09

toxcct

5-Sep-05 21:09

prefer string& operator=(const string& s) as operator = to allow the user to cascading the calls...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Class wizard problem

heavenode5-Sep-05 18:57

heavenode

5-Sep-05 18:57

I have problem opening the class wizard, as it will show an error message. After clicking ok, i wont be able to add function, variable etc. from the class wizard.

error msg:
Parsing error: Expected "="
Input Line: "if (m_hCloas == INVALID HANDLE VALUE)"

Anyone knows what has gone wrong?

Re: Class wizard problem

MailtoGops5-Sep-05 22:01

MailtoGops

5-Sep-05 22:01

I think you have deleted the script generated by the application wizard(Basically a C++ comment lines(Statrs with /// which is used by the App wizard).

Try to look at the similar code in other files or create a temporary project and copy those scripts.. I have to be carefull while doing this.. I don't think there any other options...

Wish you better luck Smile | :)

" Action without vision is only passing time,
Vision without action is merely day dreaming,
But vision with action can change the world "

- Words from Nelson Mandela

Thanks & Regards,

Gopalakrishnan

Re: Class wizard problem

nguyenvhn5-Sep-05 22:18

nguyenvhn

5-Sep-05 22:18

I think the code line would be:
if (m_hCloas == INVALID_HANDLE_VALUE)

Re: Class wizard problem

heavenode5-Sep-05 22:24

heavenode

5-Sep-05 22:24

thanks, i found out the problem, it lies inside the constructor. the problem is solved after i removed the 'if section' code.

does it mean i cant have an if statement inside constructor???

CTAMADlg::CTAMADlg(CWnd* pParent /*=NULL*/)
: CDialog(CTAMADlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CTAMADlg)

m_hDevice = INVALID_HANDLE_VALUE;
m_hClose = INVALID_HANDLE_VALUE;

m_hClose = CreateEvent (NULL, TRUE, FALSE, NULL);
if ( m_hClose == INVALID_HANDLE_VALUE )
{
MessageBox("Thread event error!","Error",MB_OK);
}

//}}AFX_DATA_INIT

m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

Text data conversion into different file formats

Member 3618575-Sep-05 18:49

Member 361857

5-Sep-05 18:49

Hi,
I am looking for the solution/guide line to convert text data into the following file format,
1.PDF
2.HTML
3.GIF
4.JPEG
5.3gp
6.DOC
7.RTF
one important point here is that all these conversion needs to be following UNICODE. There are different library available for each of the format but they are either very complex or does not support UNICODE.

does any one has simple solution for this?

Thanks.

Help, error when deleting m_p in destructor.

followait5-Sep-05 18:49

followait

5-Sep-05 18:49

struct stTst
{
stTst(){p=NULL;}
~stTst(){
if (p!=NULL) {
delete p;
}
}
int i;
int j;
char c;
int *p;
};

void CTestdeleteDlg::OnButton1()
{
int k=123;
stTst *p=new stTst[10];
p->p=&k;
delete[] p;
}

-- modified at 1:01 Tuesday 6th September, 2005

Re: Help, error when deleting m_p in destructor.

khan++5-Sep-05 19:03

khan++

5-Sep-05 19:03

followait wrote:
stTst *p=new stTst[10];
Here, you are creating 10 objects of the class.
If you need only one object, then:
stTst* p = new stTst;
...
delete p;

If you really need 10 objects, then you need to access them through a subscript, like:
stTst* p = new stTst[10];
p[0]->p = &k; //etc
p[1]->p = &k2;
...
To delete all the objects:
delete[] p;

this is this.

It's my careless, it should be delete[] p, but still have a error.

followait5-Sep-05 19:33

followait

5-Sep-05 19:33

It's my careless, it should be delete[] p, but still have a error.

Re: It's my careless, it should be delete[] p, but still have a error.

Jose Lamas Rios5-Sep-05 19:50

Jose Lamas Rios

5-Sep-05 19:50

You are allocating k in the stack and then using delete on it inside the destructor of stTst. If stTst is going to assume its p member points to a heap-allocated int and that it can delete the pointer, you'd need to change your code to:

void CTestdeleteDlg::OnButton1() 
{
   int* pK = new int;
   *pK = 123;
   stTst* p = new stTst[10];
   p->p = pK;
   delete[] p;
}

--
jlr
http://jlamas.blogspot.com/[^]

Re: Help, error when deleting m_p in destructor.

MailtoGops5-Sep-05 21:57

MailtoGops

5-Sep-05 21:57

Hi,

int k=123;
stTst *p=new stTst[10];
p->p=&k;
delete[] p;

look k is allocated in the stack memory of the function OnButton1(). You are assigning the address of k to a class member variable and deleting it through dynamic deletion option. You can do that.

You cannot dynamically delete a variable which is allocated in the stack.

So you supposed not to delete the

" Action without vision is only passing time,
Vision without action is merely day dreaming,
But vision with action can change the world "

- Words from Nelson Mandela

Thanks & Regards,

Gopalakrishnan

Thanks.

followait5-Sep-05 22:56

followait

5-Sep-05 22:56

Thanks

LPT Port programming in Win32(sdk)

rohanr2p5-Sep-05 18:31

rohanr2p

5-Sep-05 18:31

i want to communicate with a device through LPT port, how can i do this using Win32(sdk) programming, plz help me.

Re: LPT Port programming in Win32(sdk)

khan++5-Sep-05 18:57

khan++

5-Sep-05 18:57

Here is a free driver for the parallel port.
http://www.logix4u.net/inpout32.htm[^]

this is this.

how to install windows NT services

GflPower5-Sep-05 18:24

GflPower

5-Sep-05 18:24

how to install windows NT services?

d

Re: how to install windows NT services

GflPower5-Sep-05 18:42

GflPower

5-Sep-05 18:42

how to install windows NT service int cmd ?

d

Re: how to install windows NT services

prasad_som5-Sep-05 19:14

prasad_som

5-Sep-05 19:14

use [servicepath.exe] -service on commandline

Re: how to install windows NT services

ThatsAlok5-Sep-05 23:30

ThatsAlok

5-Sep-05 23:30

prasad_som wrote:
use [servicepath.exe] -service on commandline

Sorry for correcting you, No executable sample generated through wizard's contain implementation for -service command line.
You required api call to CreateService to install service in local Service manager database

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: how to install windows NT services

prasad_som14-Sep-05 22:29

prasad_som

14-Sep-05 22:29

It will definitely work. I was answering "how to install NT serive:
And answer posted by me is right.I've used it in one of my project Smile | :)

Sorry for replying late to your comment. But some how i'm not getting mails from CP, even if i select checkbox "Notify me by email if..."

Re: how to install windows NT services

ThatsAlok14-Sep-05 22:44

ThatsAlok

14-Sep-05 22:44

prasad_som wrote:
It will definitely work. I was answering "how to install NT serive:

---Sorry comment deleted--------------------------
actually the Service should process/acknowledge -install command line, thats not default functionality

prasad_som wrote:
anI've used it in one of my project
Thats nice and i started my career with that Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

-- modified at 4:46 Thursday 15th September, 2005

Re: how to install windows NT services

ThatsAlok6-Sep-05 0:59

ThatsAlok

6-Sep-05 0:59

GflPower wrote:

how to install windows NT service int cmd ?

use CreateService api

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: how to install windows NT services

Marc Soleda5-Sep-05 20:44

Marc Soleda

5-Sep-05 20:44

Read this[^] guide.

Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

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