CreateFile Help KimTu please

[Kim Tu]

I'd like to get CreateFile handle when I open a volume "C:\\" but I always get -1

I test this in C++ I get 0xffffffff

Can someone shed a light on this for me please ?

Thanks

Kim Tu

[darwen]

That's because it's a directory and not a file...

Darwen.

[zips]

0xffffffff is the same value as -1 for Int32.

[cilu]

Negative numbers are represented in 2's complement. The rule is like this: Represent the absolute value in binary then invert all bits then add 1.

-1 = 0000 0000 0000 0000 0000 0000 0000 0001
then invert
1111 1111 1111 1111 1111 1111 1111 1110
then add 1
1111 1111 1111 1111 1111 1111 1111 1111
and that is 0xffffffff.

[toraj58]

good hint Cilu on 2's complement

[ricky_cpp]

Try this:

namespace CSCreateFile
{
class Program
{
static void Main(string[] args)
{
string filePath, fileName;
filePath = "D:\\testDirectory\\";
fileName = filePath + "test.txt";

Directory.CreateDirectory(filePath);
File.Create(fileName);
}
}
}

-Ricky

[Marie Mih]

It is @"\\.\C:" not @"C:\"
Enjoy coding!

[toraj58]

it is what???