C / C++ / MFC

Re: help! Breakpoint cannot be set

11-Sep-02 9:00

close VC, delete your apps .NCB file, rebuild all.

-c

Greenspun's Tenth Rule of Programming:
"Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified bug-ridden slow implementation of half of Common Lisp."

ns11-Sep-02 9:23

11-Sep-02 9:23

Thank you very much!
ns

An ADO question

dsfasdfadsfasdfadsf11-Sep-02 8:10

dsfasdfadsfasdfadsf

11-Sep-02 8:10

Assume that when certain query is executed, the record set object will contain 20 results. But i want my record set object to contain results from 11 to 20 among all these. How can i do so ???

Re: An ADO question

Nick Parker11-Sep-02 8:29

Nick Parker

11-Sep-02 8:29

I have never done this in VC++ before, however the ADO object should be essentially the same Unsure | :~

. Here is a link on how you can page your recordset in ASP, again many of the ideas should be the same, such as the usage of the AbsolutePage, and PageCount properties.

Paging a recordset [^]

HTH

Nick Parker

Re: An ADO question

Carlos Antollini11-Sep-02 9:50

Carlos Antollini

11-Sep-02 9:50

You need to use pagesize to 10... and move between pages and records...

Best Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Template class with unlimited parameters (Advanced)

conrad Braam11-Sep-02 8:06

conrad Braam

11-Sep-02 8:06

I want to create a template class, with unlimited # parameters, basically I need a special template that is like a collection, but I can access each member directly.

I want to create something like this
class myclass : public mybaseclass
{
public:
myclass();

DWORD myvalue1;
DWORD myvalue2;
DWORD myvalue3;
};
I need to be able to have a different # of members "myvalue1" etc. each time.
the difficult part is that the members must also be used in a function, that is part of the template also
myclass::ReadMembers()
{
myvalue1=1;
... etc
}

so that I do not have to enter them again, I know macros let U do this kind of thing, but they do not work to well for this application so far.

Templates are foweful, but not enough, I even looked at BEGIN_MESSAGE_MAP macro from MFC, because that idea might do it, but it can't as far as I can see. Confused | :confused:

GRRR.... Maybe I need a 4GL language, not C++.

Conrad - conradb@adroit.co.za
Always do badly to start off, that way when you get the hang of it suddenly, everyone is surprised.

Re: Template class with unlimited parameters (Advanced)

Joaquín M López Muñoz11-Sep-02 8:25

Joaquín M López Muñoz

11-Sep-02 8:25

Something like this should work (I don't have a compiler handy, so beware of errors):

template <int n> class C;
 
template <> class C<0>
{
public:
  void read_members()
  {
  }
};
 
template <int n> class C: public C<n-1>
{
  typedef C<n-1> super;
public:
  int value;
  void read_members()
  {
    value=1;
    super::read_members();
  }
};

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Multicolumn listbox

danag11-Sep-02 7:44

11-Sep-02 7:44

I have a requirement to fill the listbox with 2 columns.

I know how to implement a listbox with single column?

Could someone tell me how to do it?

Thanks

C^hris L^osinger11-Sep-02 7:48

11-Sep-02 7:48

use a CListCtrl instead.

-c

Greenspun's Tenth Rule of Programming:
"Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified bug-ridden slow implementation of half of Common Lisp."

danag11-Sep-02 7:51

11-Sep-02 7:51

Thanks for a quick response. I will try listcontrol.

danag11-Sep-02 8:47

11-Sep-02 8:47

I am getting an assertion failure in the last line of this function. When I click the 'Ignore' button, I am getting a message box with the message
'Unsupported operation was attempted'.
I donot have any clue to fix it?

Pl help me.

BOOL displaydlg::OnInitDialog()
{
CListCtrl *plistb = (CListCtrl *) GetDlgItem(IDC_LIST2);

LV_ITEM lvI;
// Initialize LV_ITEM members that are common to all items
lvI.mask = LVIF_TEXT | LVIF_PARAM | LVIF_STATE;
lvI.state = 0;
lvI.stateMask = 0;
lvI.iImage = 0;

CString str;

int i =0;
if (m_pSet1->IsOpen()) {
m_pSet1->Close();
}
m_pSet1->Open();

while (!m_pSet1->IsEOF()) {

lvI.iItem =i;
lvI.iSubItem = 0;
str = m_pSet1->m_Type;
lvI.pszText = (LPSTR)LPCTSTR(str);

lvI.cchTextMax = MAX_ITEMLEN;
lvI.lParam = (LPARAM) i;
if (plistb->InsertItem(&lvI) == -1)
AfxMessageBox(_T("ListSelectData::FillListCtrl error"), MB_OK);

i++;
m_pSet1->MoveNext();
}

return CDialog::OnInitDialog();
}

C^hris L^osinger11-Sep-02 9:03

11-Sep-02 9:03

are there any records in the recordset?

-c

Greenspun's Tenth Rule of Programming:
"Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified bug-ridden slow implementation of half of Common Lisp."

danag11-Sep-02 9:13

11-Sep-02 9:13

Yes, having 3 records.
If i comment out return CDialog::OnInitialUpdate() and return TRUE, then I am not getting this assertion failure. Only after the dailog with the listctrl filled with the records, the assertion failure appears.

C^hris L^osinger11-Sep-02 10:32

11-Sep-02 10:32

try this:

call CDialog::OnInitDialog first in your function (not last). then return FALSE.

-c

Greenspun's Tenth Rule of Programming:
"Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified bug-ridden slow implementation of half of Common Lisp."

danag11-Sep-02 11:02

11-Sep-02 11:02

No, it doesnot work.

C^hris L^osinger11-Sep-02 11:04

11-Sep-02 11:04

what happens?

Greenspun's Tenth Rule of Programming:
"Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified bug-ridden slow implementation of half of Common Lisp."

danag11-Sep-02 11:07

11-Sep-02 11:07

Getting an assertion failure immediately. If I click 'Ignore' button, an message box appears with msg 'unsupported operation was attempted'

C^hris L^osinger11-Sep-02 11:09

11-Sep-02 11:09

can you step into the function?

Greenspun's Tenth Rule of Programming:
"Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified bug-ridden slow implementation of half of Common Lisp."

danag11-Sep-02 11:23

How can I send a mail from my application ?

11-Sep-02 11:23

I fixed the problem.

The assertion failure is thrown when calling DoDataExchange();
CDialog::OnInitialUpdate() calling CDialog::UpdateData(FALSE) calling CDialog::DoDataExchange(..).

Actually I had an button control in the dialog and an corresponding button variable in the Dialog class and hence the DoDataExchange() had an line containing button variable. Then I removed the Button variable from the resource. But didnot remove from the code.

I tried to remove the button variable from the Dialogs class and DoDataExchange() and thus it worked.

Thanks for your help. Sorry for the trouble.

Qadddd11-Sep-02 7:28

Qadddd

11-Sep-02 7:28

Hello,
I would like to send a mail automaticaly from my application in vc++ with a file in attachement.
What's the good way to do it ?
Thanks in advance
DD

Re: How can I send a mail from my application ?

C^hris L^osinger11-Sep-02 7:34