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Read a string at a given address
作者:武汉SEO闵涛  文章来源:敏韬网  点击数1148  更新时间:2009/4/23 18:59:41  文章录入:mintao  责任编辑:mintao
Date: 6/17/2000
Versions: VB4/32 VB5 VB6 Level: Intermediate
Author:
The VB2TheMax Team

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (dest As _
    Any, source As Any, ByVal bytes As Long)
Private Declare Function lstrlenA Lib "kernel32" (ByVal lpString As Long) As _
    Long
Private Declare Function lstrlenW Lib "kernel32" (ByVal lpString As Long) As _
    Long

'''' retrieve a string at a given address
'''' if LENGTH < 0 the string is considered to be null-terminated
'''' and the function determines its length

Function StringFromAddr(ByVal address As Long, ByVal length As Long, _
    Optional ByVal isUnicode As Boolean) As String
    '''' determine the length, if necessary
    If length < 0 Then
        If isUnicode Then
            length = lstrlenW(address)
        Else
            length = lstrlenA(address)
        End If
    End If
    '''' copy the characters
    StringFromAddr = Space$(length)
    If isUnicode Then
        CopyMemory ByVal StrPtr(StringFromAddr), ByVal address, length * 2
    Else
        CopyMemory ByVal StringFromAddr, ByVal address, length
    End If
End Function

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