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2012年2月21日 (火)

ローカルファイルの履歴を削除する。

Win32APIやNETはホントよくわかりません。見よう見まねです。苦労しました。

DeleteHist.vb

Imports System.Runtime.InteropServices
'Class for deleting the cache.
Public Class Class1
        'For PInvoke: Contains information about an entry in the Internet cache
        <StructLayout(LayoutKind.Explicit, Size:=80)> _
        Public Structure INTERNET_CACHE_ENTRY_INFOA
        <FieldOffset(0)> Public dwStructSize As UInt32
        <FieldOffset(4)> Public lpszSourceUrlName As String
        <FieldOffset(8)> Public lpszLocalFileName As String
        <FieldOffset(12)> Public CacheEntryType As UInt32
        <FieldOffset(16)> Public dwUseCount As UInt32
        <FieldOffset(20)> Public dwHitRate As UInt32
        <FieldOffset(24)> Public dwSizeLow As UInt32
        <FieldOffset(28)> Public dwSizeHigh As UInt32
        <FieldOffset(32)> Public LastModifiedTime As Long
        <FieldOffset(40)> Public ExpireTime As Long
        <FieldOffset(48)> Public LastAccessTime As Long
        <FieldOffset(56)> Public LastSyncTime As Long
        <FieldOffset(64)> Public lpHeaderInfo As IntPtr
        <FieldOffset(68)> Public dwHeaderInfoSize As UInt32
        <FieldOffset(72)> Public lpszFileExtension As IntPtr
        <FieldOffset(76)> Public dwReserved As UInt32
        <FieldOffset(76)> Public dwExemptDelta As UInt32
    End Structure

   'For PInvoke: Begins the enumeration of the Internet cache
   <DllImport("wininet.dll", _
       SetLastError:=True, _
       CharSet:=CharSet.Auto, _
       EntryPoint:="FindFirstUrlCacheEntryA", _
       CallingConvention:=CallingConvention.StdCall)> _
    Shared Function FindFirstUrlCacheEntry( _
   <MarshalAs(UnmanagedType.LPStr)> ByVal lpszUrlSearchPattern As String, _
         ByVal lpFirstCacheEntryInfo As IntPtr, _
         ByRef lpdwFirstCacheEntryInfoBufferSize As Int32) As IntPtr
    End Function

    'For PInvoke: Retrieves the next entry in the Internet cache
    <DllImport("wininet.dll", _
       SetLastError:=True, _
       CharSet:=CharSet.Auto, _
       EntryPoint:="FindNextUrlCacheEntryA", _
       CallingConvention:=CallingConvention.StdCall)> _
    Shared Function FindNextUrlCacheEntry( _
          ByVal hFind As IntPtr, _
          ByVal lpNextCacheEntryInfo As IntPtr, _
          ByRef lpdwNextCacheEntryInfoBufferSize As Integer) As Boolean
    End Function

    'For PInvoke: Removes the file that is associated with the source name from the cache, if the file exists
    <DllImport("wininet.dll", _
      SetLastError:=True, _
      CharSet:=CharSet.Auto, _
      EntryPoint:="DeleteUrlCacheEntryW", _
      CallingConvention:=CallingConvention.StdCall)> _
    Shared Function DeleteUrlCacheEntry( _
        ByVal lpszUrlName As String) As Boolean
    End Function

End Class
    
'次のコードを Module1.vb モジュールに追加:
'Imports System.Runtime.InteropServices
Module Module1

    Sub Main()
        'No more items have been found.
        'File not found.
        Const ERROR_FILE_NOT_FOUND As Integer = &H2
        Const ERROR_NO_MORE_ITEMS As Integer = 259
        Const NORMAL_CACHE_ENTRY As Integer = 1
        Const URLHISTORY_CACHE_ENTRY As Integer = &H200000
        'Local variables
        Dim cacheEntryInfoBufferSizeInitial As Integer = 0
        Dim cacheEntryInfoBufferSize As Integer = 0
        Dim cacheEntryInfoBuffer As IntPtr = IntPtr.Zero
        Dim internetCacheEntry As Class1.INTERNET_CACHE_ENTRY_INFOA
        Dim enumHandle As IntPtr = IntPtr.Zero
        Dim returnValue As Boolean = False
        Dim LastVisited As DateTime

        enumHandle = Class1.FindFirstUrlCacheEntry("Visited:", IntPtr.Zero, cacheEntryInfoBufferSizeInitial)
        If (enumHandle.Equals(IntPtr.Zero) And ERROR_NO_MORE_ITEMS.Equals(Marshal.GetLastWin32Error())) Then
            Exit Sub
        End If

        cacheEntryInfoBufferSize = cacheEntryInfoBufferSizeInitial
        cacheEntryInfoBuffer = Marshal.AllocHGlobal(cacheEntryInfoBufferSize)
        enumHandle = Class1.FindFirstUrlCacheEntry("Visited:", cacheEntryInfoBuffer, cacheEntryInfoBufferSizeInitial)
        Console.WriteLine("""LastVisited"",""URL""")
        While (True)
            internetCacheEntry = CType(Marshal.PtrToStructure(cacheEntryInfoBuffer, GetType(Class1.INTERNET_CACHE_ENTRY_INFOA)), Class1.INTERNET_CACHE_ENTRY_INFOA)
            cacheEntryInfoBufferSizeInitial = cacheEntryInfoBufferSize
            If (internetCacheEntry.CacheEntryType = URLHISTORY_CACHE_ENTRY + NORMAL_CACHE_ENTRY) Then
                If (internetCacheEntry.lpszSourceUrlName.Contains("file://")) Then
                    LastVisited=DateTime.FromFileTime(internetCacheEntry.LastAccessTime)
                    Console.WriteLine("""{1}"",""{0}""",internetCacheEntry.lpszSourceUrlName,LastVisited)
                    returnValue = Class1.DeleteUrlCacheEntry(internetCacheEntry.lpszSourceUrlName)
                    If (Not returnValue AndAlso Not ERROR_FILE_NOT_FOUND.Equals(Marshal.GetLastWin32Error())) Then
                        Console.WriteLine("Error Deleting: {0}", Marshal.GetLastWin32Error())
                    End If
                End If
            End If

            returnValue = Class1.FindNextUrlCacheEntry(enumHandle, cacheEntryInfoBuffer, cacheEntryInfoBufferSizeInitial)
            If (Not returnValue And ERROR_NO_MORE_ITEMS.Equals(Marshal.GetLastWin32Error())) Then
                Exit While
            End If

            If (Not returnValue And cacheEntryInfoBufferSizeInitial > cacheEntryInfoBufferSize) Then
                cacheEntryInfoBufferSize = cacheEntryInfoBufferSizeInitial
                Dim tempIntPtr As New IntPtr(cacheEntryInfoBufferSize)
                cacheEntryInfoBuffer = Marshal.ReAllocHGlobal(cacheEntryInfoBuffer, tempIntPtr)
                returnValue = Class1.FindNextUrlCacheEntry(enumHandle, cacheEntryInfoBuffer, cacheEntryInfoBufferSizeInitial)
            End If
        End While
        Marshal.FreeHGlobal(cacheEntryInfoBuffer)

    End Sub

End Module

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