快速?要多快啊?得有个标准哦!
这个和机器的配置有关系!
这个和机器的配置有关系!
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using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;
namespace log
{
class ReadBigTxt
{ [DllImport("kernel32.dll")]
public static extern IntPtr CreateFileMapping(IntPtr hFile,
IntPtr lpFileMappingAttributes, uint flProtect,
uint dwMaximumSizeHigh,
uint dwMaximumSizeLow, string lpName); [DllImport("kernel32.dll")]
public static extern IntPtr MapViewOfFile(IntPtr hFileMappingObject, uint
dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow,
IntPtr dwNumberOfBytesToMap); [DllImport("kernel32.dll")]
public static extern bool UnmapViewOfFile(IntPtr lpBaseAddress); [DllImport("kernel32.dll")]
public static extern bool CloseHandle(IntPtr hObject); [DllImport("kernel32.dll")]
public static extern IntPtr CreateFile(string lpFileName,
int dwDesiredAccess, FileShare dwShareMode, IntPtr securityAttrs,
FileMode dwCreationDisposition, int dwFlagsAndAttributes, IntPtr hTemplateFile); [DllImport("kernel32.dll")]
public static extern uint GetFileSize(IntPtr hFile, IntPtr lpFileSizeHigh); public const int GENERIC_READ = -2147483648; //0x80000000
public const int GENERIC_WRITE = 0x40000000;
public const int GENERIC_EXECUTE = 0x20000000;
public const int GENERIC_ALL = 0x10000000;
public const int FILE_ATTRIBUTE_NORMAL = 0x80;
public const int FILE_FLAG_SEQUENTIAL_SCAN = 0x8000000;
public const int INVALID_HANDLE_VALUE = -1; public const int PAGE_NOACCESS = 1;
public const int PAGE_READONLY = 2;
public const int PAGE_READWRITE = 4; public const int FILE_MAP_COPY = 1;
public const int FILE_MAP_WRITE = 2;
public const int FILE_MAP_READ = 4;
public string GetFileTxt(string filename)
{
string str = "";
try
{
IntPtr vFileHandle = CreateFile(filename, GENERIC_READ | GENERIC_WRITE, FileShare.Read | FileShare.Write, IntPtr.Zero, FileMode.Open, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, IntPtr.Zero);
if (INVALID_HANDLE_VALUE != (int)vFileHandle)
{
IntPtr vMappingHandle = CreateFileMapping(
vFileHandle, IntPtr.Zero, PAGE_READWRITE, 0, 0, "temp");
if (vMappingHandle != IntPtr.Zero)
{
IntPtr vHead = MapViewOfFile(vMappingHandle,
FILE_MAP_COPY | FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, IntPtr.Zero);
if (vHead != IntPtr.Zero)
{
uint vSize = GetFileSize(vFileHandle, IntPtr.Zero);
byte[] nb = new byte[vSize];
Marshal.Copy(vHead, nb, 0, nb.Length);
str = System.Text.Encoding.GetEncoding("GB2312").GetString(nb);
nb = null;
UnmapViewOfFile(vHead);
}
CloseHandle(vMappingHandle);
}
CloseHandle(vFileHandle);
}
}
catch
{
return "";
}
return str; }
}
}