vb.net清空ie,vb清空窗体内容

vb.net如何重置IE浏览器设置？或vb.net如何设置IE浏览器忽略网页上指定的

VB.NET调用IE代码示例：

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Dim p As New Process

'获得URL

aURL = GetURL()

'获得IE路径

p.StartInfo.FileName =

System.Environment.

GetFolderPath( _

Environment.SpecialFolder.

ProgramFiles).Trim() _

"\Internet Explorer\

IEXPLORE.EXE"

p.StartInfo.Arguments

= aDenURL

'启动IE

'p.Start(aDenURL)

p.Start()

'主程序开始等待IE结束

p.WaitForExit()

另一种VB.NET调用IE的方法

Imports System.Threading

Private Sub Button1_Click(ByVal

sender As System.Object, ByVal e

As System.EventArgs) Handles

Button1.Click

Dim webobj As Object

webobj = CreateObject("Internet

Explorer.Application")

With webobj

.visible = True

.Navigate2(";)

Do While (.busy Or .readyState 4)

Thread.Sleep(100)

Loop

.Document.f.q.Value = Me.TextBox1.Text

.Document.f.btng.Click()

End With

MsgBox("completed.")

End Sub

vb.net清空所有窗口

清空所有窗口的话，直接就是把所有的东西都划掉就可以了，很简单的。

如何用VB定时删除cookie和ie的临时文件

清空IE缓存和Cookie

新增一个Form,新增一个ListBox,新增三个CommandButton,新增一个Label名称取默认值，粘贴下面代码到Form的代码窗口中，

定时的功能自己加一个定时器

摘自

'该示例提供读取缓存列表，删除指定缓存，删除所有缓存

Option Explicit

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

' Copyright ??1996-2008 VBnet, Randy Birch, All Rights Reserved.

' Some pages may also contain other copyrights by the author.

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

' Distribution: You can freely use this code in your own

' applications, but you may not reproduce

' or publish this code on any web site,

' online service, or distribute as source

' on any media without express permission.

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

Private Const ERROR_CACHE_FIND_FAIL As Long = 0

Private Const ERROR_CACHE_FIND_SUCCESS As Long = 1

Private Const ERROR_FILE_NOT_FOUND As Long = 2

Private Const ERROR_ACCESS_DENIED As Long = 5

Private Const ERROR_INSUFFICIENT_BUFFER As Long = 122

Private Const MAX_PATH As Long = 260

Private Const MAX_CACHE_ENTRY_INFO_SIZE As Long = 4096

Private Const LMEM_FIXED As Long = H0

Private Const LMEM_ZEROINIT As Long = H40

Private Const LPTR As Long = (LMEM_FIXED Or LMEM_ZEROINIT)

Private Const NORMAL_CACHE_ENTRY As Long = H1

Private Const EDITED_CACHE_ENTRY As Long = H8

Private Const TRACK_OFFLINE_CACHE_ENTRY As Long = H10

Private Const TRACK_ONLINE_CACHE_ENTRY As Long = H20

Private Const STICKY_CACHE_ENTRY As Long = H40

Private Const SPARSE_CACHE_ENTRY As Long = H10000

Private Const COOKIE_CACHE_ENTRY As Long = H100000

Private Const URLHISTORY_CACHE_ENTRY As Long = H200000

Private Const URLCACHE_FIND_DEFAULT_FILTER As Long = NORMAL_CACHE_ENTRY Or _

COOKIE_CACHE_ENTRY Or _

URLHISTORY_CACHE_ENTRY Or _

TRACK_OFFLINE_CACHE_ENTRY Or _

TRACK_ONLINE_CACHE_ENTRY Or _

STICKY_CACHE_ENTRY

Private Type FILETIME

dwLowDateTime As Long

dwHighDateTime As Long

End Type

Private Type INTERNET_CACHE_ENTRY_INFO

dwStructSize As Long

lpszSourceUrlName As Long

lpszLocalFileName As Long

CacheEntryType As Long

dwUseCount As Long

dwHitRate As Long

dwSizeLow As Long

dwSizeHigh As Long

LastModifiedTime As FILETIME

ExpireTime As FILETIME

LastAccessTime As FILETIME

LastSyncTime As FILETIME

lpHeaderInfo As Long

dwHeaderInfoSize As Long

lpszFileExtension As Long

dwExemptDelta As Long

End Type

Private Declare Function FindFirstUrlCacheEntry Lib "wininet" _

Alias "FindFirstUrlCacheEntryA" _

(ByVal lpszUrlSearchPattern As String, _

lpFirstCacheEntryInfo As Any, _

lpdwFirstCacheEntryInfoBufferSize As Long) As Long

Private Declare Function FindNextUrlCacheEntry Lib "wininet" _

Alias "FindNextUrlCacheEntryA" _

(ByVal hEnumHandle As Long, _

lpNextCacheEntryInfo As Any, _

lpdwNextCacheEntryInfoBufferSize As Long) As Long

Private Declare Function FindCloseUrlCache Lib "wininet" _

(ByVal hEnumHandle As Long) As Long

Private Declare Function DeleteUrlCacheEntry Lib "wininet" _

Alias "DeleteUrlCacheEntryA" _

(ByVal lpszUrlName As String) As Long

Private Declare Sub CopyMemory Lib "kernel32" _

Alias "RtlMoveMemory" _

(pDest As Any, _

pSource As Any, _

ByVal dwLength As Long)

Private Declare Function lstrcpyA Lib "kernel32" _

(ByVal RetVal As String, ByVal Ptr As Long) As Long

Private Declare Function lstrlenA Lib "kernel32" _

(ByVal Ptr As Any) As Long

Private Declare Function LocalAlloc Lib "kernel32" _

(ByVal uFlags As Long, _

ByVal uBytes As Long) As Long

Private Declare Function LocalFree Lib "kernel32" _

(ByVal hMem As Long) As Long

Private Sub Form_Load()

Command1.Caption = "Get Cache"

Command2.Caption = "Delete Selected"

Command3.Caption = "Delete All"

Label1.Caption = ""

End Sub

Private Sub Form_Resize()

If Me.WindowState vbMinimized Then

If Me.Width 3000 Then

With Command1

.Left = Me.ScaleWidth - .Width - 200

.Top = 200

End With

With Command2

.Left = Command1.Left

.Top = Command1.Top + Command1.Height + 100

End With

With Command3

.Left = Command1.Left

.Top = Command2.Top + Command2.Height + 100

End With

With Label1

.Left = 200

.Top = Me.ScaleHeight - 100 - Label1.Height

End With

With List1

.Left = 200

.Top = 200

.Width = Command1.Left - 300

.Height = (Me.ScaleHeight - 300) - (Me.ScaleHeight - Label1.Top)

End With

End If

End If

End Sub

Private Sub Command1_Click()

With List1

'this speeds up adding to the list

'and eliminates list flicker

.Visible = False

.Clear

Call GetCacheURLList

.Visible = True

Label1.Caption = .ListCount " files listed."

End With

End Sub

Private Sub Command2_Click()

Dim cachefile As String

Dim currindex As Long

Dim currtopindex As Long

'delete the selected file

With List1

'because we're going to reload

'the cache following the deletion,

'be nice and save the current list

'position so it can be restored later

currtopindex = .TopIndex

currindex = .ListIndex

cachefile = .List(currindex)

Call DeleteUrlCacheEntry(cachefile)

'reload the list, hiding the list box

'to prevent flicker. (This workaround

'will not provided the desired results

'if a DoEvents is added to the

'GetCacheURLList routine!)

.Visible = False

GetCacheURLList

.TopIndex = currtopindex

If currindex = .ListCount Then

.ListIndex = currindex - 1

Else

.ListIndex = currindex

End If

.Visible = True

Label1.Caption = .ListCount " files listed."

End With

End Sub

Private Sub Command3_Click()

Dim cachefile As String

Dim cnt As Long

With List1

'delete all files

For cnt = 0 To .ListCount - 1

cachefile = .List(cnt)

'if the file is a cookie let's not

'delete it in case it is used to

'store password data.

'

'remove the Instr() test if you want

'to delete cookies as well

If InStr(cachefile, "Cookie") = 0 Then

Call DeleteUrlCacheEntry(cachefile)

End If

Next

.Visible = False

GetCacheURLList

.ListIndex = -1

.Visible = True

Label1.Caption = .ListCount " files listed."

End With

End Sub

Private Sub List1_Click()

Command2.Enabled = InStr(List1.List(List1.ListIndex), "Cookie") = 0

End Sub

Private Sub GetCacheURLList()

Dim icei As INTERNET_CACHE_ENTRY_INFO

Dim hFile As Long

Dim cachefile As String

Dim posUrl As Long

Dim posEnd As Long

Dim dwBuffer As Long

Dim pntrICE As Long

List1.Clear

'Like other APIs, calling FindFirstUrlCacheEntry or

'FindNextUrlCacheEntry with an buffer of insufficient

'size will cause the API to fail. Call first to

'determine the required buffer size.

hFile = FindFirstUrlCacheEntry(0, ByVal 0, dwBuffer)

'both conditions should be met by the first call

If (hFile = ERROR_CACHE_FIND_FAIL) And _

(Err.LastDllError = ERROR_INSUFFICIENT_BUFFER) Then

'The INTERNET_CACHE_ENTRY_INFO data type

'is a variable-length UDT. It is therefore

'necessary to allocate memory for the result

'of the call and to pass a pointer to this

'memory location to the API.

pntrICE = LocalAlloc(LMEM_FIXED, dwBuffer)

'allocation successful

If pntrICE 0 Then

'set a Long pointer to the memory location

CopyMemory ByVal pntrICE, dwBuffer, 4

'call FindFirstUrlCacheEntry again

'now passing the pointer to the

'allocated memory

hFile = FindFirstUrlCacheEntry(vbNullString, _

ByVal pntrICE, _

dwBuffer)

'hfile should = 1 (success)

If hFile ERROR_CACHE_FIND_FAIL Then

'loop through the cache

Do

'the pointer has been filled, so move the

'data back into a ICEI structure

CopyMemory icei, ByVal pntrICE, Len(icei)

'CacheEntryType is a long representing

'the type of entry returned

If (icei.CacheEntryType And _

NORMAL_CACHE_ENTRY) = NORMAL_CACHE_ENTRY Then

'extract the string from the memory location

'pointed to by the lpszSourceUrlName member

'and add to a list

cachefile = GetStrFromPtrA(icei.lpszSourceUrlName)

List1.AddItem cachefile

End If

'free the pointer and memory associated

'with the last-retrieved file

Call LocalFree(pntrICE)

'and again by repeating the procedure but

'now calling FindNextUrlCacheEntry. Again,

'the buffer size set to 0 causing the call

'to fail and return the required size as dwBuffer

dwBuffer = 0

Call FindNextUrlCacheEntry(hFile, ByVal 0, dwBuffer)

'allocate and assign the memory to the pointer

pntrICE = LocalAlloc(LMEM_FIXED, dwBuffer)

CopyMemory ByVal pntrICE, dwBuffer, 4

'and call again with the valid parameters.

'If the call fails (no more data), the loop exits.

'If the call is successful, the Do portion of the

'loop is executed again, extracting the data from

'the returned type

Loop While FindNextUrlCacheEntry(hFile, ByVal pntrICE, dwBuffer)

End If 'hFile

End If 'pntrICE

End If 'hFile

'clean up by closing the find handle,

'as well as calling LocalFree again

'to be safe

Call LocalFree(pntrICE)

Call FindCloseUrlCache(hFile)

End Sub

Private Function GetStrFromPtrA(ByVal lpszA As Long) As String

GetStrFromPtrA = String$(lstrlenA(ByVal lpszA), 0)

Call lstrcpyA(ByVal GetStrFromPtrA, ByVal lpszA)

End Function