• jicman <cabrera_ _wrc.xerox.com> Oct 20 2007
• jicman <cabrera_ _wrc.xerox.com> Oct 20 2007
• Frank Benoit <keinfarbton googlemail.com> Oct 21 2007

jicman <cabrera_ _wrc.xerox.com> writes:

Greetings.

I am working with a Windows COM program and I am getting a hex string like
this, "0x001C", and I would like to change it to a long.  I tried a few things,
but std.conv conversion is failing.

Any help would be greatly appreciated?

thanks,

josé

jicman <cabrera_ _wrc.xerox.com> writes:

jicman Wrote:

 Greetings.
 
 I am working with a Windows COM program and I am getting a hex string like
this, "0x001C", and I would like to change it to a long.  I tried a few things,
but std.conv conversion is failing.
 
 Any help would be greatly appreciated?
 
 thanks,
 
 josé


found this,

http://www.digitalmars.com/d/archives/digitalmars/D/learn/read_Hexadecimal_value_from_string_8632.html#N8633

import std.string, std.stdio;
import std.c.stdlib;

long hexToLong(string s)
{
	long v = strtoul(toStringz(s), null, 16);
	if (getErrno() == ERANGE) throw new Exception("Out of range");
	return v;
}

void main()
{
	writefln("%d",hexToLong("0xC"));
}

Frank Benoit <keinfarbton googlemail.com> writes:

jicman schrieb:
 jicman Wrote:
 
 Greetings.

 I am working with a Windows COM program and I am getting a hex string like
this, "0x001C", and I would like to change it to a long.  I tried a few things,
but std.conv conversion is failing.

 Any help would be greatly appreciated?

 thanks,

 josé


 found this,
 
 http://www.digitalmars.com/d/archives/digitalmars/D/learn/read_Hexadecimal_value_from_string_8632.html#N8633
 
 import std.string, std.stdio;
 import std.c.stdlib;
 
 long hexToLong(string s)
 {
 	long v = strtoul(toStringz(s), null, 16);
 	if (getErrno() == ERANGE) throw new Exception("Out of range");
 	return v;
 }
 
 void main()
 {
 	writefln("%d",hexToLong("0xC"));
 }


Your example above uses toStringz which does a heap allocation. This is
no good choice if you need to do this convertion a lot.

the tango.text.convert.Integer module has a parse function which takes a
base argument. Just cut the "0x".

Anyway, doing your own implementation is not so hard :)