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.