Hello all, how can I check for multiple file attributes using bitwise
operators ? I'm thinking along the lines of
string fname = "c:\\test.t xt";
if(File.GetAttr ibutes(fname) & (FileAttributes .ReadOnly |
FileAttributes. Archive ))
{
File.SetAttribu tes(fname,FileA ttributes.Norma l);
}
Basically I'm trying to say "If Readonly or Archive" then set the attribute
to normal, as you can tell I'm new to C# 4 12289
Pete,
Yes, the FileAttributes enumeration is a bitwise mask, so you would
compare in that manner. However, you do have to make sure the result is not
zero, because C# does not assume that a non zero integer value evaluates to
true, rather, you have to use a boolean value.
In essence, you need to change your expression to this:
if ((File.GetAttri butes(fname) & (FileAttributes .ReadOnly |
FileAttributes. Archive)) != 0)
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Pete Kane" <pk****@ntlworl d.com> wrote in message
news:Fn******** ********@newsfe 1-win.ntli.net... Hello all, how can I check for multiple file attributes using bitwise operators ? I'm thinking along the lines of
string fname = "c:\\test.t xt"; if(File.GetAttr ibutes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive ))
{
File.SetAttribu tes(fname,FileA ttributes.Norma l);
}
Basically I'm trying to say "If Readonly or Archive" then set the attribute to normal, as you can tell I'm new to C#
sorry Nicholas I posted directly to you, I thought I was on the right lines
but it's nice to have confirmation, BTW what's the difference between | and
|| ?
regards
Pete Kane
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:%2******** ********@tk2msf tngp13.phx.gbl. .. Pete,
Yes, the FileAttributes enumeration is a bitwise mask, so you would compare in that manner. However, you do have to make sure the result is not zero, because C# does not assume that a non zero integer value evaluates to true, rather, you have to use a boolean value.
In essence, you need to change your expression to this:
if ((File.GetAttri butes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive)) != 0)
Hope this helps.
-- - Nicholas Paldino [.NET/C# MVP] - mv*@spam.guard. caspershouse.co m
"Pete Kane" <pk****@ntlworl d.com> wrote in message news:Fn******** ********@newsfe 1-win.ntli.net... Hello all, how can I check for multiple file attributes using bitwise operators ? I'm thinking along the lines of
string fname = "c:\\test.t xt"; if(File.GetAttr ibutes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive ))
{
File.SetAttribu tes(fname,FileA ttributes.Norma l);
}
Basically I'm trying to say "If Readonly or Archive" then set the attribute to normal, as you can tell I'm new to C#
Pete,
|| (and &&) are logical operators, meant to be used on boolean types. |
(and &) are bitwise operators, meant to be used on integral types for bit
masking.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Pete Kane" <pk****@ntlworl d.com> wrote in message
news:bU******** ********@newsfe 1-win.ntli.net... sorry Nicholas I posted directly to you, I thought I was on the right lines but it's nice to have confirmation, BTW what's the difference between | and || ?
regards
Pete Kane
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in message news:%2******** ********@tk2msf tngp13.phx.gbl. .. Pete,
Yes, the FileAttributes enumeration is a bitwise mask, so you would compare in that manner. However, you do have to make sure the result is not zero, because C# does not assume that a non zero integer value evaluates to true, rather, you have to use a boolean value.
In essence, you need to change your expression to this:
if ((File.GetAttri butes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive)) != 0)
Hope this helps.
-- - Nicholas Paldino [.NET/C# MVP] - mv*@spam.guard. caspershouse.co m
"Pete Kane" <pk****@ntlworl d.com> wrote in message news:Fn******** ********@newsfe 1-win.ntli.net... Hello all, how can I check for multiple file attributes using bitwise operators ? I'm thinking along the lines of
string fname = "c:\\test.t xt"; if(File.GetAttr ibutes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive ))
{
File.SetAttribu tes(fname,FileA ttributes.Norma l);
}
Basically I'm trying to say "If Readonly or Archive" then set the attribute to normal, as you can tell I'm new to C#
thanks Nicholas, have a good Xmas...
regards
Pete Kane
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:eE******** *****@TK2MSFTNG P14.phx.gbl... Pete,
|| (and &&) are logical operators, meant to be used on boolean types. | (and &) are bitwise operators, meant to be used on integral types for bit masking.
-- - Nicholas Paldino [.NET/C# MVP] - mv*@spam.guard. caspershouse.co m
"Pete Kane" <pk****@ntlworl d.com> wrote in message news:bU******** ********@newsfe 1-win.ntli.net... sorry Nicholas I posted directly to you, I thought I was on the right lines but it's nice to have confirmation, BTW what's the difference between | and || ?
regards
Pete Kane
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in message news:%2******** ********@tk2msf tngp13.phx.gbl. .. Pete,
Yes, the FileAttributes enumeration is a bitwise mask, so you would compare in that manner. However, you do have to make sure the result is not zero, because C# does not assume that a non zero integer value evaluates to true, rather, you have to use a boolean value.
In essence, you need to change your expression to this:
if ((File.GetAttri butes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive)) != 0)
Hope this helps.
-- - Nicholas Paldino [.NET/C# MVP] - mv*@spam.guard. caspershouse.co m
"Pete Kane" <pk****@ntlworl d.com> wrote in message news:Fn******** ********@newsfe 1-win.ntli.net... Hello all, how can I check for multiple file attributes using bitwise operators ? I'm thinking along the lines of
string fname = "c:\\test.t xt"; if(File.GetAttr ibutes(fname) & (FileAttributes .ReadOnly | FileAttributes. Archive ))
{
File.SetAttribu tes(fname,FileA ttributes.Norma l);
}
Basically I'm trying to say "If Readonly or Archive" then set the attribute to normal, as you can tell I'm new to C#
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