TEdit, CString and Double cast 1

[bateman23]

I think this is a very simple question, but due i'm new to c++ and even newer to borland c++ , here i go:
How do i convert a input of a TEdit-field to a double ?

I searched a little and found this sample of code:
CString string;
double thedouble;
thedouble = atof((LPCSTR)string);

but i even can't define a cString (and yes, i already did &quot;include <cstring.h>&quot
Is there anybody out there who can help me ?

Thanx in advanced,
Daniel ---------------------------------------
Visit me @:

http://www.daniel-purucker.de/

 

[hennep]

I don't know much about VC++ but,

could the AnsiString be the solution ?

 

[Totte]

CString....i interpete it as &quot;C-String&quot;. i.e. an array of char's and it can be declared as:

char string[Length+1]; // The '+1' allows for End-Of-String marker Totte

 

[bateman23]

Yes, i meant C-String... BUT
i tried char temp_p[20] = txtp->Text; (txtp is a TEdit-Control) to get the content of the Text-field into an array.
But i just got the error-message: &quot;Can't convert ANSI-String to char[20]&quot;!

So instead i tried:
String temp_p;
temp_p = txtp->Text;

This worked, but then converting this string to double didn't work:
p = atof((LPCSTR)temp_p);
gave the error-message: &quot;Cast from ANSI-String to const char not possible&quot;...

---------------------------------------
Visit me @:

http://www.daniel-purucker.de/

 

[2ffat]

Try this:

String MyString = "3.14";
double TheDouble = 0;

// do conversions in a try ... catch statment just in case
try
{
    TheDouble = StrToFloat(MyString.c_str());
}
catch (...)
{
   // Opps there was an error
   // Handle it here
}

You could also try ToDouble. James P. Cottingham

When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity.
[tab][tab]Albert Einstein explaining his Theory of Relativity to a group of journalists.

 

[bateman23]

That worked great...Thanks ;-)
and merry christms to all of you ---------------------------------------
Visit me @:

http://www.daniel-purucker.de/