Re: Edit Control - C / C++ / MFC Discussion Boards

Alan Balkany6-Jun-08 3:15

6-Jun-08 3:15

FYI, LPCTSTR is another name for const char*, according to

http://www.codeguru.com/forum/archive/index.php/t-78509.html[^]

which is what I suggested previously.

Re: Edit Control

toxcct5-Jun-08 0:02

toxcct

5-Jun-08 0:02

several ways.

either you get the full content as a string, then you cast it to an integer youself, or you can also map an integer variable to your edit control.

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Re: Edit Control

Rajesh R Subramanian5-Jun-08 0:15

Rajesh R Subramanian

5-Jun-08 0:15

See GetDlgItemInt()[^] and GetWindowText()[^]

Or use a member variable and call UpdateData(true) (The last thing you should be doing, if you know what it does).

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

Re: Edit Control

sudhir_Kumar5-Jun-08 0:33

sudhir_Kumar

5-Jun-08 0:33

Attach int variable with edit control with the help of class Wizard.

-@SuDhIrKuMaR@-

Re: Edit Control

sudhir_Kumar5-Jun-08 0:35

sudhir_Kumar

5-Jun-08 0:35

You can also attach double variable for DDX.

-@SuDhIrKuMaR@-

Re: Edit Control

James R. Twine5-Jun-08 1:11

James R. Twine

5-Jun-08 1:11

   If you are not filtering the allowable characters in the edit control, you may have cases where users enter data that cannot be converted to a double. For example, 12345.65a, abc123, 123..4, etc.

   While I would suggest getting the text from the control and then converting it to a double, I would use strtod(...)/_tcstod(...)/wcstod(...) instead. It provides a way to tell you what character causes conversion to fail, which can be used to provide automatic error handling (i.e. ignore any invalid characters), or to provide a more helpful error message to the user.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<hr></hr>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Re: Edit Control

Trupti Mehta5-Jun-08 4:21

Trupti Mehta

5-Jun-08 4:21

Thanks James. But still not to the mark. Actually I want to convert CString to int. So, based on your hint, I opted to use strtol and then cast it to int, as i didn't find any method that converts strtoi.

CString csValue;
GetDlgItem(IDC_OpNo_EDIT)->GetWindowText( csValue );   // Get the value of text box
LPTSTR p = csValue.GetBuffer(10);    // NEED THIS TO CONVERT TO CHAR* TO USE IN strtol
char* stopString;

long l = strtol(p, stopString, 9);  // GET ERROR DUE TO lptsrt & NOT CHAR*
csValue.ReleaseBuffer();
double d = atof((LPCTSTR)csValue);

The error is :
: error C2664: 'strtol' : cannot convert parameter 1 from 'unsigned short *' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

atof also gives the same error.

aNY WAY to convert LPTSTR ot CString to char*, TCHAR* or wCHAR*.

Thanks

Terry

Re: Edit Control

James R. Twine5-Jun-08 6:47

James R. Twine

5-Jun-08 6:47

Change the function to wcstod or _tcstod, if you are straight Unicode or TCHAR-based building as Unicode, respectively.

PEace!

Re: Edit Control

David Crow5-Jun-08 2:45

David Crow

5-Jun-08 2:45

See here.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Question on accessing variable within innerblock?

Super Hornet4-Jun-08 23:54

Super Hornet

4-Jun-08 23:54

#include "iostream.h"


int x = 10;

int main()
{
	int x = 8;

	{
		int x = 5;
		cout << x << ::x ;
		//can we access the value of x which is defined as int x = 8 here?	}

	return 0;
}

Re: Question on accessing variable within innerblock?

toxcct5-Jun-08 0:00

toxcct

5-Jun-08 0:00

~~yes, that's what cout << x does~~ you updated your post, so now, the answer is no.

you can only access a most inner variable (by using its name) or accessing the global variable by prepending its name with the global scope operator ( :: ).

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Re: Question on accessing variable within innerblock?

CPallini5-Jun-08 0:11

CPallini

5-Jun-08 0:11

As posted you question is ambiguous.
Anyway the following one is clear

Super Hornet wrote:
//can we access the value of x which is defined as int x = 8 here?

and the answer is (AFAIK ) no: the inner x hides the outer one.
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

Re: Question on accessing variable within innerblock?

sudhir_Kumar5-Jun-08 0:29

sudhir_Kumar

5-Jun-08 0:29

No you Can't the value with ::x will be the value from the global namespace. Smile | :)

-@SuDhIrKuMaR@-

Re: Question on accessing variable within innerblock?

Nibu babu thomas5-Jun-08 0:58

Nibu babu thomas

5-Jun-08 0:58

Super Hornet wrote:
//can we access the value of x which is defined as int x = 8 here?

If you badly need it then rename inner x to something else or store the previous x(main) in some variable before you declare the most inner x and use that variable.

This is not the optimal way for naming variables. You can easily give different names. Or is this an interview question?

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: Question on accessing variable within innerblock?

Eytukan5-Jun-08 1:58

Eytukan

5-Jun-08 1:58

#include "iostream.h"
int x = 10;
int y;
int main()
{	
int x = 8;
y = x;
{	
int x = 5;		
cout << x << ::x ;		
 USE Y! ;)
//can we access the value of x which is defined as int x = 8 here?
}
return 0;
}

In other words, NO. You cannot do it.

OK,. what country just started work for the day ? The ASP.NET forum is flooded with retarded questions. -Christian Graus

Best wishes to Rexx[^]

Re: Question on accessing variable within innerblock?

Rajesh R Subramanian5-Jun-08 2:46

Rajesh R Subramanian

5-Jun-08 2:46

You may use namespaces to avoid collisions.

#include<iostream>
namespace Global
{ 
  int x = 0;
  namespace inner
  {
     int x = 2;
  }

}
int main()
{
  int x = 1;
  {
     int x = 4; cout<<"This is from within a brace "<<x<<endl;
     //Braces confine the existence of variables as well, just, FYI.
  }
  cout<<"Global::x"<<Global::x<<endl;
  cout<<"x"<<x<<endl;
  cout<<"Global::inner"<<Global::inner::x<<endl;

return true;
} 

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