/// <summary>
///
/// </summary>
/// <param name="accessRights">Desired access rights for process handle</param>
/// <param name="pid">Process ID</param>
/// <returns>Handle to process or <see cref="IntPtr.Zero"/> if process doesn't exists</returns>
/// <exception cref="Win32Exception">Unexpected WinApi error</exception>
public static IntPtr OpenProcessHandle(ProcessAccessRights accessRights, int pid)
{
var handle = IntPtr.Zero;
try
{
handle = Kernel32.OpenProcess(accessRights, false, pid);
if (handle == IntPtr.Zero)
{
var errorCode = Marshal.GetLastWin32Error();
if (errorCode == (int)ErrorCodes.ERROR_INVALID_PARAMETER)
{
return(IntPtr.Zero); // ERROR_INVALID_PARAMETER means that process doesn't exist. Don't throw exception here, because this error is expected and shouldn't crash ctor's
}
Win32ExceptionUtility.Throw(errorCode);
}
}
catch
{
Kernel32.CloseHandle(handle);
throw;
}
return(handle);
}
public static void EnsureProcessIsRunning(IntPtr handle, int pid)
{
if (handle == IntPtr.Zero)
{
ThrowOnNonExistentProcess(pid);
}
if (!Kernel32.GetExitCodeProcess(handle, out var exitCode))
{
Win32ExceptionUtility.Throw();
}
if (exitCode != ProcessExitCodes.STILL_ALIVE)
{
ThrowOnProcessExit(pid);
}
}
