123 lines
4.0 KiB
C#
123 lines
4.0 KiB
C#
// ----------------------------------------------------------------------------
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ----------------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.Runtime.InteropServices;
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using System.Text;
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using webfiles;
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namespace webfiles
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{
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class FileReader
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{
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//const uint FILE_FLAG_NO_BUFFERING = 0x20000000;
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const uint FILE_FLAG_NO_BUFFERING = 0;
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const uint GENERIC_READ = 0x80000000;
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const uint OPEN_EXISTING = 3;
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IntPtr handle;
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[DllImport("kernel32", SetLastError=true)]
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private static extern unsafe IntPtr CreateFile(
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string FileName, // file name
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uint DesiredAccess, // access mode
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uint ShareMode, // share mode
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uint SecurityAttributes, // Security Attributes
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uint CreationDisposition, // how to create
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uint FlagsAndAttributes, // file attributes
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int hTemplateFile // handle to template file
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);
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[DllImport("kernel32", SetLastError=true)]
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private static extern unsafe bool ReadFile(
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IntPtr hFile, // handle to file
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void* pBuffer, // data buffer
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int NumberOfBytesToRead, // number of bytes to read
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int* pNumberOfBytesRead, // number of bytes read
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int Overlapped // overlapped buffer
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);
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[DllImport("kernel32", SetLastError=true)]
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private static extern unsafe bool CloseHandle(
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IntPtr hObject // handle to object
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);
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[DllImport("kernel32", SetLastError=true)]
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private static extern unsafe uint GetFileSize(
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IntPtr hObject, // handle to object
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uint *pFileSizeHigh // receives high 32-bits of file size.
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);
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public bool Open(string FileName)
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{
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// open the existing file for reading
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handle = CreateFile(
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FileName,
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GENERIC_READ,
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0,
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0,
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OPEN_EXISTING,
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FILE_FLAG_NO_BUFFERING,
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0);
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if (handle != IntPtr.Zero && handle != ((IntPtr) (-1))) {
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return true;
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}
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else {
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return false;
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}
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}
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public unsafe int Read(byte[] buffer, int index, int count)
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{
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int n = 0;
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fixed (byte* p = buffer) {
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if (!ReadFile(handle, p + index, count, &n, 0)) {
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return 0;
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}
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}
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return n;
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}
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public bool Close()
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{
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// close file handle
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return CloseHandle(handle);
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}
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public unsafe int Size()
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{
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return (int)GetFileSize(handle, null);
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}
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}
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public class SpecMain
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{
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//--------------------------------------------------
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// Main routine
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//--------------------------------------------------
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public static int Main(string[] args)
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{
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FileReader reader = new FileReader();
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DateTime start = DateTime.Now;
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for (int i = 1; i < 1000; i++) {
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if (!reader.Open(args[0])) {
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Console.WriteLine("Failed");
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throw new Exception("argh..");
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}
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reader.Close();
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}
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DateTime end = DateTime.Now;
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TimeSpan elapsed = end - start;
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Console.WriteLine("5000 iterations = {0}",elapsed);
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return 0;
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} // main
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} //specmain class}
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}
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