UnsafeNativeMethods.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / Microsoft / Win32 / UnsafeNativeMethods.cs / 1305376 / UnsafeNativeMethods.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace Microsoft.Win32 { 
    using System.Runtime.InteropServices; 
    using System.Runtime.Versioning;
    using System; 
    using System.Diagnostics.CodeAnalysis;
#if !SILVERLIGHT
    using System.Threading;
    using System.Security.Permissions; 
    using System.Collections;
    using System.IO; 
    using System.Text; 
    using Microsoft.Win32.SafeHandles;
    using System.Configuration; 

    [HostProtectionAttribute(MayLeakOnAbort = true)]
    [System.Security.SuppressUnmanagedCodeSecurity]
#endif // !SILVERLIGHT 
    internal static class UnsafeNativeMethods {
 
        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.Machine)]
        public static extern IntPtr GetStdHandle(int type); 

#if !FEATURE_PAL

        [DllImport(ExternDll.User32, CharSet = System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC); 
 
        [DllImport(ExternDll.User32, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.Machine)] 
        public static extern IntPtr GetDC(IntPtr hWnd);

        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage", Justification = "reviewed")]
        [DllImport(ExternDll.Gdi32, CharSet = System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject); 
 
        [DllImport(ExternDll.User32, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern int GetSystemMetrics(int nIndex);

#if !SILVERLIGHT
        [DllImport(ExternDll.User32, ExactSpelling=true)] 
        [ResourceExposure(ResourceScope.Process)]
        public static extern IntPtr GetProcessWindowStation(); 
        [DllImport(ExternDll.User32, SetLastError=true)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern bool GetUserObjectInformation(HandleRef hObj, int nIndex, [MarshalAs(UnmanagedType.LPStruct)] NativeMethods.USEROBJECTFLAGS pvBuffer, int nLength, ref int lpnLengthNeeded); 
        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Auto, BestFitMapping=false)]
        [ResourceExposure(ResourceScope.Machine)]
        public static extern IntPtr GetModuleHandle(string modName);
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto, BestFitMapping=false)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern bool GetClassInfo(HandleRef hInst, string lpszClass, [In, Out] NativeMethods.WNDCLASS_I wc); 
 
        [DllImport(ExternDll.User32, ExactSpelling = true, CharSet = CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern bool IsWindow(HandleRef hWnd);

        //SetClassLong won't work correctly for 64-bit: we should use SetClassLongPtr instead.  On
        //32-bit, SetClassLongPtr is just #defined as SetClassLong.  SetClassLong really should 
        //take/return int instead of IntPtr/HandleRef, but since we're running this only for 32-bit
        //it'll be OK. 
        public static IntPtr SetClassLong(HandleRef hWnd, int nIndex, IntPtr dwNewLong) { 
            if (IntPtr.Size == 4) {
                return SetClassLongPtr32(hWnd, nIndex, dwNewLong); 
            }
            return SetClassLongPtr64(hWnd, nIndex, dwNewLong);
        }
        [DllImport(ExternDll.User32, CharSet = System.Runtime.InteropServices.CharSet.Auto, EntryPoint = "SetClassLong")] 
        [ResourceExposure(ResourceScope.None)]
        [SuppressMessage("Microsoft.Portability", "CA1901:PInvokeDeclarationsShouldBePortable")] 
        public static extern IntPtr SetClassLongPtr32(HandleRef hwnd, int nIndex, IntPtr dwNewLong); 
        [SuppressMessage("Microsoft.Interoperability", "CA1400:PInvokeEntryPointsShouldExist")]
        [DllImport(ExternDll.User32, CharSet = System.Runtime.InteropServices.CharSet.Auto, EntryPoint = "SetClassLongPtr")] 
        [ResourceExposure(ResourceScope.None)]
        public static extern IntPtr SetClassLongPtr64(HandleRef hwnd, int nIndex, IntPtr dwNewLong);

        //SetWindowLong won't work correctly for 64-bit: we should use SetWindowLongPtr instead.  On 
        //32-bit, SetWindowLongPtr is just #defined as SetWindowLong.  SetWindowLong really should
        //take/return int instead of IntPtr/HandleRef, but since we're running this only for 32-bit 
        //it'll be OK. 
        public static IntPtr SetWindowLong(HandleRef hWnd, int nIndex, HandleRef dwNewLong)
        { 
            if (IntPtr.Size == 4)
            {
                return SetWindowLongPtr32(hWnd, nIndex, dwNewLong);
            } 
            return SetWindowLongPtr64(hWnd, nIndex, dwNewLong);
        } 
        [SuppressMessage("Microsoft.Portability", "CA1901:PInvokeDeclarationsShouldBePortable")] 
        [DllImport(ExternDll.User32, CharSet = CharSet.Auto, EntryPoint = "SetWindowLong")]
        [ResourceExposure(ResourceScope.None)] 
        public static extern IntPtr SetWindowLongPtr32(HandleRef hWnd, int nIndex, HandleRef dwNewLong);
        [SuppressMessage("Microsoft.Interoperability", "CA1400:PInvokeEntryPointsShouldExist")]
        [DllImport(ExternDll.User32, CharSet = CharSet.Auto, EntryPoint = "SetWindowLongPtr")]
        [ResourceExposure(ResourceScope.None)] 
        public static extern IntPtr SetWindowLongPtr64(HandleRef hWnd, int nIndex, HandleRef dwNewLong);
 
 
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true, BestFitMapping=false)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern short RegisterClass(NativeMethods.WNDCLASS wc);
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true, BestFitMapping=false)]
        [ResourceExposure(ResourceScope.None)]
        public static extern short UnregisterClass(string lpClassName, HandleRef hInstance); 
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true, BestFitMapping=true)]
        [ResourceExposure(ResourceScope.Process)] 
        public static extern IntPtr CreateWindowEx(int exStyle, string lpszClassName, string lpszWindowName, int style, int x, int y, int width, 
                                              int height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, [MarshalAs(UnmanagedType.AsAny)] object pvParam);
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern IntPtr SendMessage(HandleRef hWnd, int msg, IntPtr wParam, IntPtr lParam);
        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.Process)] 
        public static extern bool SetConsoleCtrlHandler(NativeMethods.ConHndlr handler, int add);
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)] 
        public static extern IntPtr DefWindowProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
 
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.Process)]
        public static extern bool DestroyWindow(HandleRef hWnd);
 
        [DllImport(ExternDll.User32, ExactSpelling=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern int MsgWaitForMultipleObjectsEx(int nCount, IntPtr pHandles, int dwMilliseconds, int dwWakeMask, int dwFlags); 

        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern int DispatchMessage([In] ref NativeMethods.MSG msg);

        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern bool PeekMessage([In, Out] ref NativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); 
        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern IntPtr SetTimer(HandleRef hWnd, HandleRef nIDEvent, int uElapse, HandleRef lpTimerProc); 

        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)]
        public static extern bool KillTimer(HandleRef hwnd, HandleRef idEvent); 

        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)] 
        public static extern bool TranslateMessage([In, Out] ref NativeMethods.MSG msg);
        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Ansi, BestFitMapping=false)] 
        [ResourceExposure(ResourceScope.Process)]
        public static extern IntPtr GetProcAddress(HandleRef hModule, string lpProcName);

        [DllImport(ExternDll.User32, CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        public static extern bool PostMessage(HandleRef hwnd, int msg, IntPtr wparam, IntPtr lparam); 
 
        [DllImport(ExternDll.Wtsapi32, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern bool WTSRegisterSessionNotification(HandleRef hWnd, int dwFlags);

        [DllImport(ExternDll.Wtsapi32, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern bool WTSUnRegisterSessionNotification(HandleRef hWnd);
 
        // File src\services\system\io\unsafenativemethods.cs 

        public const int FILE_READ_DATA = (0x0001), 
        FILE_LIST_DIRECTORY = (0x0001),
        FILE_WRITE_DATA = (0x0002),
        FILE_ADD_FILE = (0x0002),
        FILE_APPEND_DATA = (0x0004), 
        FILE_ADD_SUBDIRECTORY = (0x0004),
        FILE_CREATE_PIPE_INSTANCE = (0x0004), 
        FILE_READ_EA = (0x0008), 
        FILE_WRITE_EA = (0x0010),
        FILE_EXECUTE = (0x0020), 
        FILE_TRAVERSE = (0x0020),
        FILE_DELETE_CHILD = (0x0040),
        FILE_READ_ATTRIBUTES = (0x0080),
        FILE_WRITE_ATTRIBUTES = (0x0100), 
        FILE_SHARE_READ = 0x00000001,
        FILE_SHARE_WRITE = 0x00000002, 
        FILE_SHARE_DELETE = 0x00000004, 
        FILE_ATTRIBUTE_READONLY = 0x00000001,
        FILE_ATTRIBUTE_HIDDEN = 0x00000002, 
        FILE_ATTRIBUTE_SYSTEM = 0x00000004,
        FILE_ATTRIBUTE_DIRECTORY = 0x00000010,
        FILE_ATTRIBUTE_ARCHIVE = 0x00000020,
        FILE_ATTRIBUTE_NORMAL = 0x00000080, 
        FILE_ATTRIBUTE_TEMPORARY = 0x00000100,
        FILE_ATTRIBUTE_COMPRESSED = 0x00000800, 
        FILE_ATTRIBUTE_OFFLINE = 0x00001000, 
        FILE_NOTIFY_CHANGE_FILE_NAME = 0x00000001,
        FILE_NOTIFY_CHANGE_DIR_NAME = 0x00000002, 
        FILE_NOTIFY_CHANGE_ATTRIBUTES = 0x00000004,
        FILE_NOTIFY_CHANGE_SIZE = 0x00000008,
        FILE_NOTIFY_CHANGE_LAST_WRITE = 0x00000010,
        FILE_NOTIFY_CHANGE_LAST_ACCESS = 0x00000020, 
        FILE_NOTIFY_CHANGE_CREATION = 0x00000040,
        FILE_NOTIFY_CHANGE_SECURITY = 0x00000100, 
        FILE_ACTION_ADDED = 0x00000001, 
        FILE_ACTION_REMOVED = 0x00000002,
        FILE_ACTION_MODIFIED = 0x00000003, 
        FILE_ACTION_RENAMED_OLD_NAME = 0x00000004,
        FILE_ACTION_RENAMED_NEW_NAME = 0x00000005,
        FILE_CASE_SENSITIVE_SEARCH = 0x00000001,
        FILE_CASE_PRESERVED_NAMES = 0x00000002, 
        FILE_UNICODE_ON_DISK = 0x00000004,
        FILE_PERSISTENT_ACLS = 0x00000008, 
        FILE_FILE_COMPRESSION = 0x00000010, 
        OPEN_EXISTING = 3,
        OPEN_ALWAYS = 4, 
        FILE_FLAG_WRITE_THROUGH = unchecked((int)0x80000000),
        FILE_FLAG_OVERLAPPED = 0x40000000,
        FILE_FLAG_NO_BUFFERING = 0x20000000,
        FILE_FLAG_RANDOM_ACCESS = 0x10000000, 
        FILE_FLAG_SEQUENTIAL_SCAN = 0x08000000,
        FILE_FLAG_DELETE_ON_CLOSE = 0x04000000, 
        FILE_FLAG_BACKUP_SEMANTICS = 0x02000000, 
        FILE_FLAG_POSIX_SEMANTICS = 0x01000000,
        FILE_TYPE_UNKNOWN = 0x0000, 
        FILE_TYPE_DISK = 0x0001,
        FILE_TYPE_CHAR = 0x0002,
        FILE_TYPE_PIPE = 0x0003,
        FILE_TYPE_REMOTE = unchecked((int)0x8000), 
        FILE_VOLUME_IS_COMPRESSED = 0x00008000;
 
        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage", Justification = "reviewed")] 
        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)] 
        public extern static int LookupAccountSid(string systemName, byte[] pSid, StringBuilder szUserName, ref int userNameSize, StringBuilder szDomainName, ref int domainNameSize, ref int eUse);
#endif // !SILVERLIGHT

#endif // !FEATURE_PAL 

#if !SILVERLIGHT 
        public const int GetFileExInfoStandard = 0; 

        [StructLayout(LayoutKind.Sequential)] 
        public struct WIN32_FILE_ATTRIBUTE_DATA {
            internal int fileAttributes;
            internal uint ftCreationTimeLow;
            internal uint ftCreationTimeHigh; 
            internal uint ftLastAccessTimeLow;
            internal uint ftLastAccessTimeHigh; 
            internal uint ftLastWriteTimeLow; 
            internal uint ftLastWriteTimeHigh;
            internal uint fileSizeHigh; 
            internal uint fileSizeLow;
        }

#if !FEATURE_PAL 
        // file Windows Forms
        [DllImport(ExternDll.Version, CharSet=CharSet.Auto, SetLastError=true, BestFitMapping=false)] 
        [ResourceExposure(ResourceScope.Machine)] 
        public static extern int GetFileVersionInfoSize(string lptstrFilename, out int handle);
        [DllImport(ExternDll.Version, CharSet=CharSet.Auto, BestFitMapping=false)] 
        [ResourceExposure(ResourceScope.Machine)]
        public static extern bool GetFileVersionInfo(string lptstrFilename, int dwHandle, int dwLen, HandleRef lpData);
        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage")]
        [SuppressMessage("Microsoft.Security", "CA2101:SpecifyMarshalingForPInvokeStringArguments")] 
        [DllImport(ExternDll.Kernel32, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.Machine)] 
        public static extern int GetModuleFileName(HandleRef hModule, StringBuilder buffer, int length); 
        [DllImport(ExternDll.Version, CharSet=CharSet.Auto, BestFitMapping=false)]
        [ResourceExposure(ResourceScope.Process)]   // Review usages to see if versioning problems exist in distant callers 
        public static extern bool VerQueryValue(HandleRef pBlock, string lpSubBlock, [In, Out] ref IntPtr lplpBuffer, out int len);
        [DllImport(ExternDll.Version, CharSet=CharSet.Auto, BestFitMapping=true)]
        [ResourceExposure(ResourceScope.None)]
        public static extern int VerLanguageName( int langID, StringBuilder lpBuffer, int nSize); 

        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)] 
        [ResourceExposure(ResourceScope.Machine)] 
        public static extern bool ReportEvent(SafeHandle hEventLog, short type, ushort category,
                                                uint eventID, byte[] userSID, short numStrings, int dataLen, HandleRef strings, 
                                                byte[] rawData);
        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)]
        [ResourceExposure(ResourceScope.Machine)]
        public static extern bool ClearEventLog(SafeHandle hEventLog, HandleRef lpctstrBackupFileName); 
        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)] 
        public static extern bool GetNumberOfEventLogRecords(SafeHandle hEventLog, out int count); 
        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)] 
        [return: MarshalAs(UnmanagedType.Bool)]
        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage", Justification = "[....]: EventLog is protected by EventLogPermission")]
        public static extern bool GetOldestEventLogRecord(SafeHandle hEventLog, out int number);
        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)] 
        [ResourceExposure(ResourceScope.Machine)]
        [return: MarshalAs(UnmanagedType.Bool)] 
        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage", Justification = "[....]: EventLog is protected by EventLogPermission")] 
        public static extern bool ReadEventLog(SafeHandle hEventLog, int dwReadFlags,
                                                 int dwRecordOffset, byte[] buffer, int numberOfBytesToRead, out int bytesRead, 
                                                 out int minNumOfBytesNeeded);
        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        [return: MarshalAs(UnmanagedType.Bool)] 
        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage", Justification = "[....]: EventLog is protected by EventLogPermission")]
        public static extern bool NotifyChangeEventLog(SafeHandle hEventLog, SafeWaitHandle hEvent); 
 
        [DllImport(ExternDll.Kernel32, EntryPoint="ReadDirectoryChangesW", CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)] 
        public unsafe static extern bool ReadDirectoryChangesW(SafeFileHandle hDirectory, HandleRef lpBuffer,
                                                                int nBufferLength, int bWatchSubtree, int dwNotifyFilter, out int lpBytesReturned,
                                                                NativeOverlapped* overlappedPointer, HandleRef lpCompletionRoutine);
 
        //////////////////// Serial Port structs ////////////////////
        // Declaration for C# representation of Win32 Device Control Block (DCB) 
        // structure.  Note that all flag properties are encapsulated in the Flags field here, 
        // and accessed/set through SerialStream's GetDcbFlag(...) and SetDcbFlag(...) methods.
        internal struct DCB 
        {

            public uint DCBlength;
            public uint BaudRate; 
            public uint Flags;
            public ushort wReserved; 
            public ushort XonLim; 
            public ushort XoffLim;
            public byte ByteSize; 
            public byte Parity;
            public byte StopBits;
            public byte XonChar;
            public byte XoffChar; 
            public byte ErrorChar;
            public byte EofChar; 
            public byte EvtChar; 
            public ushort wReserved1;
        } 

        // Declaration for C# representation of Win32 COMSTAT structure associated with
        // a file handle to a serial communications resource.  SerialStream's
        // InBufferBytes and OutBufferBytes directly expose cbInQue and cbOutQue to reading, respectively. 
        internal struct COMSTAT
        { 
            public uint Flags; 
            public uint cbInQue;
            public uint cbOutQue; 
        }

        // Declaration for C# representation of Win32 COMMTIMEOUTS
        // structure associated with a file handle to a serial communications resource. 
        ///Currently the only set fields are ReadTotalTimeoutConstant
        // and WriteTotalTimeoutConstant. 
        internal struct COMMTIMEOUTS 
        {
            public int ReadIntervalTimeout; 
            public int ReadTotalTimeoutMultiplier;
            public int ReadTotalTimeoutConstant;
            public int WriteTotalTimeoutMultiplier;
            public int WriteTotalTimeoutConstant; 
        }
 
        // Declaration for C# representation of Win32 COMMPROP 
        // structure associated with a file handle to a serial communications resource.
        // Currently the only fields used are dwMaxTxQueue, dwMaxRxQueue, and dwMaxBaud 
        // to ensure that users provide appropriate settings to the SerialStream constructor.
        internal struct COMMPROP
        {
            public ushort  wPacketLength; 
            public ushort  wPacketVersion;
            public int dwServiceMask; 
            public int dwReserved1; 
            public int dwMaxTxQueue;
            public int dwMaxRxQueue; 
            public int dwMaxBaud;
            public int dwProvSubType;
            public int dwProvCapabilities;
            public int dwSettableParams; 
            public int dwSettableBaud;
            public ushort wSettableData; 
            public ushort  wSettableStopParity; 
            public int dwCurrentTxQueue;
            public int dwCurrentRxQueue; 
            public int dwProvSpec1;
            public int dwProvSpec2;
            public char wcProvChar;
        } 
        //////////////////// end Serial Port structs ////////////////////
 
        //////////////////// Serial Port methods //////////////////// 

 

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)]
        [ResourceExposure(ResourceScope.Machine)]
        internal static extern SafeFileHandle CreateFile(String lpFileName, 
            int dwDesiredAccess, int dwShareMode,
            IntPtr securityAttrs, int dwCreationDisposition, 
            int dwFlagsAndAttributes, IntPtr hTemplateFile); 

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool GetCommState(
            SafeFileHandle hFile,  // handle to communications device
            ref DCB lpDCB    // device-control block 
            );
 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool SetCommState( 
            SafeFileHandle hFile,  // handle to communications device
            ref DCB lpDCB    // device-control block
            );
 

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)] 
        internal static extern bool GetCommModemStatus(
            SafeFileHandle hFile,        // handle to communications device 
            ref int lpModemStat  // control-register values
            );

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool SetupComm( 
            SafeFileHandle hFile,     // handle to communications device 
            int dwInQueue,  // size of input buffer
            int dwOutQueue  // size of output buffer 
            );

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        internal static extern bool SetCommTimeouts(
            SafeFileHandle hFile,                  // handle to comm device 
            ref COMMTIMEOUTS lpCommTimeouts  // time-out values 
            );
 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool SetCommBreak(
            SafeFileHandle hFile                 // handle to comm device 
            );
 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool ClearCommBreak( 
            SafeFileHandle hFile                 // handle to comm device
            );

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool ClearCommError( 
            SafeFileHandle hFile,                 // handle to comm device 
            ref int lpErrors,
            ref COMSTAT lpStat 
            );

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        internal static extern bool ClearCommError(
            SafeFileHandle hFile,                 // handle to comm device 
            ref int lpErrors, 
            IntPtr lpStat
            ); 

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool PurgeComm( 
            SafeFileHandle hFile,  // handle to communications resource
            uint dwFlags  // action to perform 
            ); 

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool FlushFileBuffers(SafeFileHandle hFile);

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)] 
        [ResourceExposure(ResourceScope.None)]
        internal static extern bool GetCommProperties( 
            SafeFileHandle hFile,           // handle to comm device 
            ref COMMPROP lpCommProp   // communications properties
            ); 

        // All actual file Read/Write methods, which are declared to be unsafe.
        [DllImport(ExternDll.Kernel32, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)] 
        unsafe internal static extern int ReadFile(SafeFileHandle handle, byte* bytes, int numBytesToRead, IntPtr numBytesRead, NativeOverlapped* overlapped);
 
        [DllImport(ExternDll.Kernel32, SetLastError=true)] 
        [ResourceExposure(ResourceScope.None)]
        unsafe internal static extern int ReadFile(SafeFileHandle handle, byte* bytes, int numBytesToRead, out int numBytesRead, IntPtr overlapped); 

        [DllImport(ExternDll.Kernel32 , SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        unsafe internal static extern int WriteFile(SafeFileHandle handle, byte* bytes, int numBytesToWrite, IntPtr numBytesWritten, NativeOverlapped* lpOverlapped); 

        [DllImport(ExternDll.Kernel32 , SetLastError=true)] 
        [ResourceExposure(ResourceScope.None)] 
        unsafe internal static extern int WriteFile(SafeFileHandle handle, byte* bytes, int numBytesToWrite, out int numBytesWritten, IntPtr lpOverlapped);
 
        [DllImport(ExternDll.Kernel32 , SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        internal static extern int GetFileType(
            SafeFileHandle hFile   // handle to file 
            );
        [DllImport(ExternDll.Kernel32 , SetLastError=true)] 
        [ResourceExposure(ResourceScope.None)] 
        internal static extern bool EscapeCommFunction(
            SafeFileHandle hFile, // handle to communications device 
            int dwFunc      // extended function to perform
            );

        [DllImport(ExternDll.Kernel32 , SetLastError=true)] 
        [ResourceExposure(ResourceScope.None)]
        unsafe internal static extern bool WaitCommEvent( 
            SafeFileHandle hFile,                // handle to comm device 
            int* lpEvtMask,                      // event type
            NativeOverlapped* lpOverlapped       // overlapped structure 
            );

        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)] 
        unsafe internal static extern bool SetCommMask(
            SafeFileHandle hFile, 
            int dwEvtMask 
        );
 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto)]
        [ResourceExposure(ResourceScope.None)]
        unsafe internal static extern bool GetOverlappedResult(
            SafeFileHandle hFile, 
            NativeOverlapped* lpOverlapped,
            ref int lpNumberOfBytesTransferred, 
            bool bWait 
        );
 

      //////////////////// end Serial Port methods ////////////////////
#endif // !FEATURE_PAL
 
 [ComImport, Guid("00000017-0000-0000-c000-000000000046"),
        InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)] 
        internal interface IStdMarshal { 

 
            // just a stub to hold the GUID
        }

 

         [ComImport, Guid("00000003-0000-0000-C000-000000000046"), 
        InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)] 
        internal interface IMarshal
        { 
            [PreserveSig]
            int GetUnmarshalClass(
                ref Guid riid,
                IntPtr pv, 
                int dwDestContext,
                IntPtr pvDestContext, 
                int mshlflags, 
                out Guid pCid);
 
            [PreserveSig]
            int GetMarshalSizeMax(
                ref Guid riid,
                IntPtr pv, 
                int dwDestContext,
                IntPtr pvDestContext, 
                int mshlflags, 
                out int pSize);
 
            [PreserveSig]
            int MarshalInterface(
                [MarshalAs(UnmanagedType.Interface)]object pStm,
                ref Guid riid, 
                IntPtr pv,
                int dwDestContext, 
                IntPtr pvDestContext, 
                int mshlflags);
 
            [PreserveSig]
            int UnmarshalInterface(
                [MarshalAs(UnmanagedType.Interface)]object pStm,
                ref Guid riid, 
                out IntPtr ppv);
 
            [PreserveSig] 
            int ReleaseMarshalData( [MarshalAs(UnmanagedType.Interface)]object pStm);
 
            [PreserveSig]
            int DisconnectObject(int dwReserved);
        }
 

        [DllImport(ExternDll.Ole32)] 
        [ResourceExposure(ResourceScope.None)] 
        internal static extern int CoMarshalInterface(
           [MarshalAs(UnmanagedType.Interface)]object pStm, 
                ref Guid riid,
                IntPtr pv,
                int dwDestContext,
                IntPtr pvDestContext, 
                int mshlflags
        ); 
 
        [DllImport(ExternDll.Ole32)]
        [ResourceExposure(ResourceScope.None)] 
        internal static extern int CoGetStandardMarshal(
                ref Guid riid,
                IntPtr pv,
                int dwDestContext, 
                IntPtr pvDestContext,
                int mshlflags, 
                out IntPtr ppMarshal 
        );
 
        [DllImport(ExternDll.Ole32)]
        [ResourceExposure(ResourceScope.None)]
        internal static extern int CoGetMarshalSizeMax(
                out int pulSize, 
                ref Guid riid,
                IntPtr pv, 
                int dwDestContext, 
                IntPtr pvDestContext,
                int mshlflags 
        );


#endif // !SILVERLIGHT 

    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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