我需要更改LastWriteTime智能设备项目（Windows Mobile 6 Professional）中的属性，所以我使用的是 Compact Framework。
该类File支持获取最后写入时间（File.GetLastWriteTime），但File.SetLastWriteTime不支持该方法。
我尝试使用FileInfo类及其LastWriteTime属性，但它对于 Compact Framework 是只读的。
我能怎么做？
问问题
1088 次
2 回答
3
在紧凑框架上，许多功能不受支持。你必须 p/invoke 这个 windows API 函数。
于 2012-11-18T13:31:01.173 回答
2
用
DateTime dtNow = new DateTime();
dtNow = DateTime.Now;
Win32Setfiletime.setLastWrite(@"\zdump.exe", dtNow);
Win32文件时间：
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace SetFileTime
{
class Win32Setfiletime
{
[StructLayout(LayoutKind.Sequential)]
struct FILETIME
{
public uint DateTimeLow;
public uint DateTimeHigh;
}
[StructLayout(LayoutKind.Sequential)]
struct SYSTEMTIME
{
[MarshalAs(UnmanagedType.U2)]
public short Year;
[MarshalAs(UnmanagedType.U2)]
public short Month;
[MarshalAs(UnmanagedType.U2)]
public short DayOfWeek;
[MarshalAs(UnmanagedType.U2)]
public short Day;
[MarshalAs(UnmanagedType.U2)]
public short Hour;
[MarshalAs(UnmanagedType.U2)]
public short Minute;
[MarshalAs(UnmanagedType.U2)]
public short Second;
[MarshalAs(UnmanagedType.U2)]
public short Milliseconds;
public SYSTEMTIME(DateTime dt)
{
dt = dt.ToUniversalTime(); // SetSystemTime expects the SYSTEMTIME in UTC
Year = (short)dt.Year;
Month = (short)dt.Month;
DayOfWeek = (short)dt.DayOfWeek;
Day = (short)dt.Day;
Hour = (short)dt.Hour;
Minute = (short)dt.Minute;
Second = (short)dt.Second;
Milliseconds = (short)dt.Millisecond;
}
}
static DateTime getDateTime(SYSTEMTIME systemTime)
{
DateTime dt = new DateTime(systemTime.Year, systemTime.Month, systemTime.Day, systemTime.Hour, systemTime.Minute, systemTime.Second);
return dt;
}
static SYSTEMTIME getSystemTime(DateTime dt)
{
SYSTEMTIME st = new SYSTEMTIME(dt);
return st;
}
static FILETIME getFileTime(DateTime dt)
{
FILETIME ft = new FILETIME();
SYSTEMTIME st = new SYSTEMTIME(dt);
SystemTimeToFileTime(ref st, ref ft);
return ft;
}
[DllImport("coredll.dll", EntryPoint = "SystemTimeToFileTime", SetLastError = true)]
static extern bool SystemTimeToFileTime(ref SYSTEMTIME lpSystemTime, ref FILETIME lpFileTime);
[DllImport("coredll.dll", SetLastError = true)]
static extern bool FileTimeToSystemTime([In] ref FILETIME lpFileTime,out SYSTEMTIME lpSystemTime);
[DllImport("coredll.dll")]
static extern bool FileTimeToLocalFileTime([In] ref FILETIME lpFileTime, out FILETIME lpLocalFileTime);
[DllImport("coredll.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetFileTime(IntPtr hFile, ref FILETIME lpCreationTime, ref FILETIME lpLastAccessTime, ref FILETIME lpLastWriteTime);
[DllImport("coredll.dll")]
static extern bool GetFileTime(IntPtr hFile, ref FILETIME lpCreationTime, ref FILETIME lpLastAccessTime, ref FILETIME lpLastWriteTime);
[DllImport("coredll", SetLastError = true)]
static extern IntPtr CreateFile(String lpFileName, EFileAccess dwDesiredAccess, EFileShare dwShareMode, IntPtr lpSecurityAttributes, ECreationDisposition dwCreationDisposition, EFileAttributes dwFlagsAndAttributes, IntPtr hTemplateFile);
#region "constants"
[Flags]
enum EFileAccess : uint
{
//
// Standart Section
//
AccessSystemSecurity = 0x1000000, // AccessSystemAcl access type
MaximumAllowed = 0x2000000, // MaximumAllowed access type
Delete = 0x10000,
ReadControl = 0x20000,
WriteDAC = 0x40000,
WriteOwner = 0x80000,
Synchronize = 0x100000,
StandardRightsRequired = 0xF0000,
StandardRightsRead = ReadControl,
StandardRightsWrite = ReadControl,
StandardRightsExecute = ReadControl,
StandardRightsAll = 0x1F0000,
SpecificRightsAll = 0xFFFF,
FILE_READ_DATA = 0x0001, // file & pipe
FILE_LIST_DIRECTORY = 0x0001, // directory
FILE_WRITE_DATA = 0x0002, // file & pipe
FILE_ADD_FILE = 0x0002, // directory
FILE_APPEND_DATA = 0x0004, // file
FILE_ADD_SUBDIRECTORY = 0x0004, // directory
FILE_CREATE_PIPE_INSTANCE = 0x0004, // named pipe
FILE_READ_EA = 0x0008, // file & directory
FILE_WRITE_EA = 0x0010, // file & directory
FILE_EXECUTE = 0x0020, // file
FILE_TRAVERSE = 0x0020, // directory
FILE_DELETE_CHILD = 0x0040, // directory
FILE_READ_ATTRIBUTES = 0x0080, // all
FILE_WRITE_ATTRIBUTES = 0x0100, // all
//
// Generic Section
//
GenericRead = 0x80000000,
GenericWrite = 0x40000000,
GenericExecute = 0x20000000,
GenericAll = 0x10000000,
SPECIFIC_RIGHTS_ALL = 0x00FFFF,
FILE_ALL_ACCESS =
StandardRightsRequired |
Synchronize |
0x1FF,
FILE_GENERIC_READ =
StandardRightsRead |
FILE_READ_DATA |
FILE_READ_ATTRIBUTES |
FILE_READ_EA |
Synchronize,
FILE_GENERIC_WRITE =
StandardRightsWrite |
FILE_WRITE_DATA |
FILE_WRITE_ATTRIBUTES |
FILE_WRITE_EA |
FILE_APPEND_DATA |
Synchronize,
FILE_GENERIC_EXECUTE =
StandardRightsExecute |
FILE_READ_ATTRIBUTES |
FILE_EXECUTE |
Synchronize
}
[Flags]
public enum EFileShare : uint
{
/// <summary>
///
/// </summary>
None = 0x00000000,
/// <summary>
/// Enables subsequent open operations on an object to request read access.
/// Otherwise, other processes cannot open the object if they request read access.
/// If this flag is not specified, but the object has been opened for read access, the function fails.
/// </summary>
Read = 0x00000001,
/// <summary>
/// Enables subsequent open operations on an object to request write access.
/// Otherwise, other processes cannot open the object if they request write access.
/// If this flag is not specified, but the object has been opened for write access, the function fails.
/// </summary>
Write = 0x00000002,
/// <summary>
/// Enables subsequent open operations on an object to request delete access.
/// Otherwise, other processes cannot open the object if they request delete access.
/// If this flag is not specified, but the object has been opened for delete access, the function fails.
/// </summary>
Delete = 0x00000004
}
enum ECreationDisposition : uint
{
/// <summary>
/// Creates a new file. The function fails if a specified file exists.
/// </summary>
New = 1,
/// <summary>
/// Creates a new file, always.
/// If a file exists, the function overwrites the file, clears the existing attributes, combines the specified file attributes,
/// and flags with FILE_ATTRIBUTE_ARCHIVE, but does not set the security descriptor that the SECURITY_ATTRIBUTES structure specifies.
/// </summary>
CreateAlways = 2,
/// <summary>
/// Opens a file. The function fails if the file does not exist.
/// </summary>
OpenExisting = 3,
/// <summary>
/// Opens a file, always.
/// If a file does not exist, the function creates a file as if dwCreationDisposition is CREATE_NEW.
/// </summary>
OpenAlways = 4,
/// <summary>
/// Opens a file and truncates it so that its size is 0 (zero) bytes. The function fails if the file does not exist.
/// The calling process must open the file with the GENERIC_WRITE access right.
/// </summary>
TruncateExisting = 5
}
[Flags]
enum EFileAttributes : uint
{
Readonly = 0x00000001,
Hidden = 0x00000002,
System = 0x00000004,
Directory = 0x00000010,
Archive = 0x00000020,
Device = 0x00000040,
Normal = 0x00000080,
Temporary = 0x00000100,
SparseFile = 0x00000200,
ReparsePoint = 0x00000400,
Compressed = 0x00000800,
Offline = 0x00001000,
NotContentIndexed = 0x00002000,
Encrypted = 0x00004000,
Write_Through = 0x80000000,
Overlapped = 0x40000000,
NoBuffering = 0x20000000,
RandomAccess = 0x10000000,
SequentialScan = 0x08000000,
DeleteOnClose = 0x04000000,
BackupSemantics = 0x02000000,
PosixSemantics = 0x01000000,
OpenReparsePoint = 0x00200000,
OpenNoRecall = 0x00100000,
FirstPipeInstance = 0x00080000
}
#endregion
public static DateTime getFileTime(string sFile)
{
DateTime dt = new DateTime();
IntPtr hFile = CreateFile(sFile,EFileAccess.FILE_GENERIC_READ, EFileShare.Write, IntPtr.Zero,ECreationDisposition.OpenExisting, EFileAttributes.Normal, IntPtr.Zero);
if (hFile != IntPtr.Zero)
{
FILETIME ftCreation = new FILETIME();
FILETIME ftLastAccess=new FILETIME();
FILETIME ftLastWrite=new FILETIME();
if (GetFileTime(hFile, ref ftCreation, ref ftLastAccess, ref ftLastWrite))
{
SYSTEMTIME st=new SYSTEMTIME();
if (FileTimeToSystemTime(ref ftLastAccess, out st))
dt = getDateTime(st);
}
}
return dt;
}
public static bool setLastWrite(string sFile, DateTime dt)
{
bool bRet = false;
IntPtr hFile = CreateFile(sFile,EFileAccess.FILE_GENERIC_READ, EFileShare.Write, IntPtr.Zero,ECreationDisposition.OpenExisting, EFileAttributes.Normal, IntPtr.Zero);
if (hFile != null)
{
FILETIME ftCreation = new FILETIME();
FILETIME ftLastAccess=new FILETIME();
FILETIME ftLastWrite=new FILETIME();
if (GetFileTime(hFile, ref ftCreation, ref ftLastAccess, ref ftLastWrite))
{
FILETIME ftNewLastWrite= new FILETIME();
ftNewLastWrite=getFileTime(dt);
SetFileTime(hFile, ref ftCreation, ref ftLastAccess, ref ftNewLastWrite);
}
}
return bRet;
}
}
}
于 2012-11-19T09:19:29.220 回答