internal static extern int NtQueryInformationProcess(
IntPtr processHandle,
int processInformationClass,
ref PROCESS_BASIC_INFORMATION processInformation,
int processInformationLength,
out int returnLength);
/// <summary>
/// Gets the parent process of a specified process.
/// </summary>
/// <param name="handle">The process handle.</param>
/// <returns>An instance of the Process class.</returns>
static Process GetParentProcess(IntPtr handle)
{
var processInfo = new PROCESS_BASIC_INFORMATION();
int returnLength;
int status = NativeMethods.LsaNtStatusToWinError(
UnsafeNativeMethods.NtQueryInformationProcess(
handle, 0, ref processInfo, Marshal.SizeOf(processInfo), out returnLength));
if (status != 0)
{
throw new Win32Exception(status);
}
try
{
return Process.GetProcessById(processInfo.InheritedFromUniqueProcessId.ToInt32());
}
catch (ArgumentException)
{
// not found
return null;
}
}