public RegistryKey FromHandle(SafeRegistryHandle handle)
{
// At this point we can't tell whether the key is writable
// or not (nor the name), so we let the error check code handle it later, as
// .Net seems to do.
return(new RegistryKey(handle.DangerousGetHandle(), String.Empty, true));
}
public FileAssociationInfo(String fileExtension)
{
int retVal = 0;
uint lpType = 0;
if (!fileExtension.StartsWith("."))
{
fileExtension = "." + fileExtension;
}
ext = fileExtension;
IntPtr hExtension = IntPtr.Zero;
// Get the file extension value.
retVal = RegOpenKeyEx(new IntPtr(HKEY_CLASSES_ROOT), fileExtension, 0, KEY_QUERY_VALUE, out hExtension);
if (retVal != ERROR_SUCCESS)
{
throw new Win32Exception(retVal);
}
// Instantiate the first SafeRegistryHandle.
hExtHandle = new SafeRegistryHandle(hExtension, true);
string appId = new string(' ', MAX_PATH);
uint appIdLength = (uint)appId.Length;
retVal = RegQueryValueEx(hExtHandle.DangerousGetHandle(), String.Empty, 0, out lpType, appId, ref appIdLength);
if (retVal != ERROR_SUCCESS)
{
throw new Win32Exception(retVal);
}
// We no longer need the hExtension handle.
hExtHandle.Dispose();
// Determine the number of characters without the terminating null.
appId = appId.Substring(0, (int)appIdLength / 2 - 1) + @"\shell\open\Command";
// Open the application identifier key.
string exeName = new string(' ', MAX_PATH);
uint exeNameLength = (uint)exeName.Length;
IntPtr hAppId;
retVal = RegOpenKeyEx(new IntPtr(HKEY_CLASSES_ROOT), appId, 0, KEY_QUERY_VALUE | KEY_SET_VALUE,
out hAppId);
if (retVal != ERROR_SUCCESS)
{
throw new Win32Exception(retVal);
}
// Instantiate the second SafeRegistryHandle.
hAppIdHandle = new SafeRegistryHandle(hAppId, true);
// Get the executable name for this file type.
string exePath = new string(' ', MAX_PATH);
uint exePathLength = (uint)exePath.Length;
retVal = RegQueryValueEx(hAppIdHandle.DangerousGetHandle(), String.Empty, 0, out lpType, exePath, ref exePathLength);
if (retVal != ERROR_SUCCESS)
{
throw new Win32Exception(retVal);
}
// Determine the number of characters without the terminating null.
exePath = exePath.Substring(0, (int)exePathLength / 2 - 1);
// Remove any environment strings.
exePath = Environment.ExpandEnvironmentVariables(exePath);
int position = exePath.IndexOf('%');
if (position >= 0)
{
args = exePath.Substring(position);
// Remove command line parameters ('%0', etc.).
exePath = exePath.Substring(0, position).Trim();
}
openCmd = exePath;
}
static SafeRegistryHandle CreateKey(SafeRegistryHandle rootkey, string path, AttributeFlags flags, KeyCreateOptions options)
{
using (ObjectAttributes obja = new ObjectAttributes(path, flags | AttributeFlags.CaseInsensitive, rootkey != null ? rootkey.DangerousGetHandle() : IntPtr.Zero))
{
IntPtr handle;
int disposition = 0;
StatusToNtException(NtCreateKey(out handle, GenericAccessRights.MaximumAllowed, obja, 0, null, options, out disposition));
return(new SafeRegistryHandle(handle, true));
}
}
