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PATH environment variable

P: n/a
Hi all, I am trying to append a certain string to the
PATH environment variable programmatically. I am able to
read what is in the variable using the System.Environment
method GetEnvironmentVariable("path"). However, I don't
know yet how to append strings to the path variable. Any
help is appreciated. Thanks a lot.
Nov 16 '05 #1
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4 Replies


P: n/a
There is no managed way to set the environment variable strings.
Rather, you will have to call the SetEnvironmentVariable function through
the P/Invoke layer.

If you are using .NET 2.0, then you can use the static
SetEnvironmentVariable method on the Environment class.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

<an*******@discussions.microsoft.com> wrote in message
news:32****************************@phx.gbl...
Hi all, I am trying to append a certain string to the
PATH environment variable programmatically. I am able to
read what is in the variable using the System.Environment
method GetEnvironmentVariable("path"). However, I don't
know yet how to append strings to the path variable. Any
help is appreciated. Thanks a lot.

Nov 16 '05 #2

P: n/a
an*******@discussions.microsoft.com wrote:

Hi all, I am trying to append a certain string to the
PATH environment variable programmatically. I am able to
read what is in the variable using the System.Environment
method GetEnvironmentVariable("path"). However, I don't
know yet how to append strings to the path variable. Any
help is appreciated. Thanks a lot.


Many ways.

One is to do the following:

string path = @"%PATH%\subfolder\yourapplication.exe";
string expanded = System.Environment.ExpandEnvironmentVairables(path );

Other way:

string expanded = System.Environment.GetEnvironmentVariable("path") +
@"\subfolder\yourapplication.exe";
Nov 16 '05 #3

P: n/a
Thanks for your reply Nicholas. Can you explain how we
can call the SetEnvironmentVariable through the P/Invoke
layer? Thanks a lot in advance.
-----Original Message-----
There is no managed way to set the environment variable strings.Rather, you will have to call the SetEnvironmentVariable function throughthe P/Invoke layer.

If you are using .NET 2.0, then you can use the staticSetEnvironmentVariable method on the Environment class.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

<an*******@discussions.microsoft.com> wrote in message
news:32****************************@phx.gbl...
Hi all, I am trying to append a certain string to the
PATH environment variable programmatically. I am able to read what is in the variable using the System.Environment method GetEnvironmentVariable("path"). However, I don't
know yet how to append strings to the path variable. Any help is appreciated. Thanks a lot.

.

Nov 16 '05 #4

P: n/a
If you want to change the parent (system) path environment, here is how I did
it:

// Import library used to broadcast a system message that the environment
changed.
[DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
static extern IntPtr SendMessageTimeout(IntPtr hWnd, uint Msg,
UIntPtr wParam, string lParam, SendMessageTimeoutFlags fuFlags,
uint uTimeout, out UIntPtr lpdwResult);

public static string RegKey = @"System\CurrentControlSet\Control\Session
Manager\Environment";

public static string NewPathForFolder = "d:\bin";
public enum SendMessageTimeoutFlags:uint
{
SMTO_NORMAL= 0x0000
, SMTO_BLOCK = 0x0001
, SMTO_ABORTIFHUNG = 0x0002
, SMTO_NOTIMEOUTIFNOTHUNG = 0x0008
}

private static void SetEnvironmentPath()
{
// Update registry with environment variable path
RegistryKey key;
key = Registry.LocalMachine.OpenSubKey(RegKey,true);
string path = (String)key.GetValue("Path");
string TestPath = NewPathForFolder;
int a = path.IndexOf(TestPath,1);
if (a == -1)
{
path += ";" + NewFolderForPath;
key.SetValue("Path", path);

//Notify all windows that User Environment variables are changed
IntPtr HWND_BROADCAST = (IntPtr) 0xffff;
const UInt32 WM_SETTINGCHANGE = 0x001A;
UIntPtr result;
IntPtr settingResult = SendMessageTimeout(HWND_BROADCAST,
WM_SETTINGCHANGE,
(UIntPtr)0,
"Environment",
SendMessageTimeoutFlags.SMTO_NORMAL,
10000,
out result);
}
}


"an*******@discussions.microsoft.com" wrote:
Hi all, I am trying to append a certain string to the
PATH environment variable programmatically. I am able to
read what is in the variable using the System.Environment
method GetEnvironmentVariable("path"). However, I don't
know yet how to append strings to the path variable. Any
help is appreciated. Thanks a lot.

Nov 16 '05 #5

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