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        // CreateFileW()
        internal const UInt32 METHOD_BUFFERED = 0;
        internal const UInt32 METHOD_IN_DIRECT = 1;
        internal const UInt32 METHOD_OUT_DIRECT = 2;
        internal const UInt32 METHOD_NEITHER = 3;

        internal const UInt32 FILE_ANY_ACCESS = (0 << 14);
        internal const UInt32 FILE_READ_ACCESS = (1 << 14);    // file & pipe
        internal const UInt32 FILE_WRITE_ACCESS = (2 << 14);   // file & pipe

        internal const Int32 INVALID_HANDLE_VALUE = -1;
        internal const UInt32 OPEN_EXISTING = 3;

        [DllImport("coredll.dll", EntryPoint="CreateFileW",
                   SetLastError = true)]
        private static extern
        IntPtr CECreateFileW(String lpFileName, UInt32 dwDesiredAccess,
                             UInt32 dwShareMode,IntPtr lpSecurityAttributes,
                             UInt32 dwCreationDisposition,
                             UInt32 dwFlagsAndAttributes,
                             IntPtr hTemplateFile);

        // CloseHandle()
        [DllImport("coredll.dll", EntryPoint="CloseHandle",
                   SetLastError = true)]
        private static extern
        int CECloseHandle(IntPtr hObject);

        // ReadFile()
        [DllImport("coredll.dll", EntryPoint="ReadFile", SetLastError = true)]
        private static extern
        int CEReadFile(IntPtr hFile, byte[] lpBuffer,
                       Int32 nNumberOfBytesToRead,
                       out Int32 lpNumberOfBytesRead, IntPtr lpOverlapped);

        // WriteFile()
        [DllImport("coredll.dll", EntryPoint="WriteFile", SetLastError = true)]
        private static extern
        int CEWriteFile(IntPtr hFile, byte[] lpBuffer,
                        Int32 nNumberOfBytesToWrite,
                        out Int32 lpNumberOfBytesWritten, IntPtr lpOverlapped);

Code: Alles auswählen

            hPort = CECreateFileW(FileName, (UInt32)access, 0, IntPtr.Zero,
                                  OPEN_EXISTING, 0, IntPtr.Zero);
            if (hPort == (IntPtr)INVALID_HANDLE_VALUE)
            {
                throw new Exception("Can't open file");
            }