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digitalmars.D.learn - Converting Hex string "0x001C" to long

reply 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,

josť
Oct 20 2007
parent reply 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,
 
 josť

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")); }
Oct 20 2007
parent 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,

 josť

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 :)
Oct 21 2007