Solved

CDialog Class Member Variable precision

Posted on 1997-10-17
4
264 Views
Last Modified: 2013-11-20
How do I set the precision for the variables.  Similar to iostream.setprecision, Fortran "FIX" etc.  I would like not to convert back and forth between types.  Can't find this info in my books or the CD-ROM online help.  Thanks for any help in this "simple" matter.
0
Comment
Question by:lucie
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 3

Expert Comment

by:shaig
ID: 1308360
I don't understand what do CDialog members have to do with precision, and if they do, could you be more presice?

Anyway this is probably a C/C++ question:
the copnversion between types in C is automatic.
It is possible to set the precision when:
a) printing - sprintf or CString::Format.  example:
  sprintf( buffer, "The float value is: %8.2f", m_floatVarible );
b) inputing - scanf(), very simulare.

hope i helped.  : - {}
0
 

Author Comment

by:lucie
ID: 1308361
VC++ uses DDX/DDV to exchange data between the Dialog Control and the Member Variable.  In context:

m_floatVariable = sqrt(some_value);

When variable data sent back to the Dialog Control, the Dialog Box displays a number like 4.23592347575, when I'd like to see a number 4.24 or 4.236.  I've found that I can accomplish this by changing the type from "double" using the _fcvt function which allows you to control the # of digits after the decimal.  I'd just like to control rounding of the variable without changing types.  In fortran, I'd just FIX 2 or 3 and be done with it.  Just want to know if you can do this in VC++
0
 
LVL 10

Accepted Solution

by:
RONSLOW earned 50 total points
ID: 1308362
Write your own DDX routine (copy the MFC version or at least call it) and do your percision fixes there.

something like this ...

void AFXAPI DDX_Text_2DP(CDataExchange* pDX, int nIDC, float& value)
{
      if (pDX->m_bSaveAndValidate) {
            DDX_Text(pDC,nIDC,value);
      } else {
            CString buffer;
            HWND hWndCtrl = pDX->PrepareEditCtrl(nIDC);
            buffer.Format("%.2f", value);
            ::SetWindowText(hWndCtrl, szBuffer);
      }
}

0
 

Author Comment

by:lucie
ID: 1308363
Thanks verrrrrrry much.

0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question