VB 二进制块读写类模块应用实例，包括一个文件拷贝和一个文件二进制比较的例子。

文件拷贝实例：（Text1存放源文件位置，Text2存放目标文件位置）------------------------------------------------------------------------

Private Sub Command3_Click()
Const BUFFER_SIZE = 40960 * 2 '规定缓冲区大小
Dim nActual As Long
Dim aBuf(0 To BUFFER_SIZE - 1) As Byte '分配缓冲区
Dim tmr As Single '计时变量
Dim lFileLen As Long '纪录文件长度
Dim iFileNum As Integer '记录文件号
Dim k As Long

tmr = Timer

If Not m_cFileRead.OpenBinary(Text1.Text) Then MsgBox "打开文件失败！" & Text1.Text
If Not m_cFileWrite.OpenBinary(Text2.Text) Then MsgBox "打开文件失败！" & Text2.Text

'记下文件长度和打开文件所用的文件号，是为了优化性能。
lFileLen = m_cFileRead.FileLength
iFileNum = m_cFileRead.FileNumber

k = 0
Do
    k = k + 1
    If k = 10 Then
        k = 0
        'pb1是进度条控件。
        pb1.Value = 100 * (Seek(iFileNum) / lFileLen) '显示百分比
        DoEvents
    End If
    '读块，传给它缓冲区指针和期望读取的字节数，返回实际读取的字节数，
    nActual = m_cFileRead.ReadBlock(VarPtr(aBuf(0)), BUFFER_SIZE)
    '写块，传给它缓冲区指针和期望写入的字节数。
    m_cFileWrite.WriteBlock VarPtr(aBuf(0)), nActual
Loop Until nActual < BUFFER_SIZE '当实际读取字节数小于缓冲区大小的时候，就不需要再读啦,已读完啦

m_cFileRead.CloseFile '关文件
m_cFileWrite.CloseFile

MsgBox "OK! total time:" & Timer - tmr
End Sub

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二进制文件比较实例(Text1存放第一个文件的位置，Text2存放第二个文件的位置)----------------------------

Private Sub Command2_Click()

Const BUFFER_SIZE As Long = 4096 * 2 '规定缓冲区大小
Dim cfRead1 As New CFileRead
Dim cfread2 As New CFileRead
Dim aBuf1(0 To BUFFER_SIZE - 1) As Byte '分配缓冲区
Dim aBuf2(0 To BUFFER_SIZE - 1) As Byte
Dim nActual  As Long
Dim i As Long, lCurPos As Long
Dim tmr As Single
Dim k As Long

tmr = Timer

If Not cfRead1.OpenBinary(Text1.Text) Then MsgBox "open file failed:" & Text1.Text
If Not cfread2.OpenBinary(Text2.Text) Then MsgBox "open file failed:" & Text2.Text

If cfRead1.FileLength <> cfread2.FileLength Then MsgBox "文件不一样长"

lCurPos = 1 '当前待比较字节的位置,虚拟位置，不同于文件的读写指针。
k = 0
Do
    '读块，传给它缓冲区指针和期望读取的字节数，返回实际读取的字节数，
    nActual = cfRead1.ReadBlock(VarPtr(aBuf1(0)), BUFFER_SIZE)
    '读第2个文件的数据块
    nActual = cfread2.ReadBlock(VarPtr(aBuf2(0)), BUFFER_SIZE)
   
    For i = 0 To nActual - 1 '比较缓冲区
        If aBuf1(i) <> aBuf2(i) Then MsgBox "不同，位置：" & lCurPos: Exit Do
        lCurPos = lCurPos + 1 '移到下一个待比较字节的位置
    Next i
   
    k = k + 1
    If k = 100 Then
        k = 0
        Cls
        Print Timer - tmr, "        ", (Seek(cfRead1.FileNumber) / 1024) / (Timer - tmr) & " KB/s"
    End If
Loop Until nActual < BUFFER_SIZE

cfRead1.CloseFile '关文件
cfread2.CloseFile

MsgBox "OK! " & Timer - tmr

End Sub

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