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//---------------------------------------------------------------------------
//
// <copyright file="SafeProcessHandle.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
// Description:
//
// History:
// 10/04/2003 : Microsoft Created
//---------------------------------------------------------------------------
// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
using System;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Windows.Automation;
using Microsoft.Win32.SafeHandles;
using MS.Win32;
namespace MS.Internal.Automation
{
internal sealed class SafeProcessHandle : SafeHandleZeroOrMinusOneIsInvalid
{
// This constructor is used by the P/Invoke marshaling layer
// to allocate a SafeHandle instance. P/Invoke then does the
// appropriate method call, storing the handle in this class.
private SafeProcessHandle() : base(true) {}
internal SafeProcessHandle(NativeMethods.HWND hwnd) : base(true)
{
int processId;
// Get process id...
// GetWindowThreadProcessId does use SetLastError(). So a call to GetLastError() would be meanless.
// Disabling the PreSharp warning.
#pragma warning suppress 6523
if (SafeNativeMethods.GetWindowThreadProcessId(hwnd, out processId) == 0)
{
throw new ElementNotAvailableException();
}
SetHandle(Misc.OpenProcess(UnsafeNativeMethods.PROCESS_QUERY_INFORMATION | UnsafeNativeMethods.PROCESS_VM_READ, false, processId, hwnd));
}
//
protected override bool ReleaseHandle()
{
return Misc.CloseHandle(handle);
}
}
}
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