我有一个vb.net代码,想要在vb 6.0中进行转换。但我有一些困难。我找不到相当于一些.net类
Dim byteswritten As Integer
Dim fs As System.IO.FileStream
Dim r As System.IO.BinaryReader
Dim CHUNK_SIZE As Integer = 65554
fs = New System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read)
r = New System.IO.BinaryReader(fs)
Dim FSize As Integer = CType(fs.Length, Integer)
Dim chunk() As Byte = r.ReadBytes(CHUNK_SIZE)
While (chunk.Length > 0)
dmPutStream.Write(chunk, chunk.Length, byteswritten)
If (FSize < CHUNK_SIZE) Then
CHUNK_SIZE = FSize
chunk = r.ReadBytes(CHUNK_SIZE)
Else
chunk = r.ReadBytes(CHUNK_SIZE)
End If
End While
那么,文档可能很大,然后我们使用chunk。但我不知道vb 6.0的步骤
比如我应该为二进制阅读做些什么。
答案 0 :(得分:1)
将VB.NET转换为VB6是一个坏主意,完全没必要。如果需要使用VB6应用程序中的VB.NET代码,最好的办法是为.NET库创建一个COM可见的包装器,并从VB6应用程序调用该包装器。
您可能可以使用VB6在功能上转换代码,但确实没有意义。 VB.NET是一种比VB6更好的语言,使用它的COM功能可以避免编写无穷无尽的粗略VB6代码。
如果您已完成此操作,则需要在功能上重现Stream和Reader类。
这是FileStream.cs的源代码: http://referencesource.microsoft.com/#mscorlib/system/io/filestream.cs
对于BinaryReader: http://referencesource.microsoft.com/#mscorlib/system/io/binaryreader.cs
答案 1 :(得分:1)
如果没有用于打开写入流和关闭读取和写入流的所有代码,以下是使用ADODB.Stream在VB6中执行此操作的示例。
在Project | References
下,添加对ADO Active X Data Objects Library
的引用。我的版本是6.1,但您可以选择最新版本 - 取决于系统上安装的ADO版本
希望有所帮助 - 如果您想查看所有ADODB.Stream methods and properties
,请在线获取更多信息Public Sub StreamData(strWriteFilename As String, filePath As String)
Const CHUNK_SIZE As Long = 65554
Dim byteswritten As Integer
Dim FSize As Long
Dim adofs As New ADODB.Stream 'Object 'System.IO.FileStream
Dim varData As Variant
' Include this here - but probably defined elsewhere
Dim dmPutStream As New ADODB.Stream
' Open Write Stream
' *** Looks like you do this elsewhere
Set dmPutStream = CreateObject("ADODB.Stream")
With dmPutStream
.Type = adTypeBinary
.Open strWriteFilename, adModeWrite
End With
' Open Read strema and start pushing data from it to the write stream
Set adofs = CreateObject("ADODB.Stream") 'New System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read)
With adofs
.Type = adTypeBinary
.Open
.LoadFromFile filePath
' Size of Read file - do you want this?
FSize = .Size
varData = .Read(CHUNK_SIZE)
Do While Len(varData) > 0
dmPutStream.Write varData
If Not .EOS Then
varData = .Read(CHUNK_SIZE)
End If
Loop
.Close
End With
'Save binary data To disk
dmPutStream.SaveToFile strWriteFilename, adSaveCreateOverWrite
dmPutStream.Close
End Sub