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LOTUSSCRIPT/COM/OLE CLASSES
Examples: Read method
1. This agent demonstrates making an exact copy of a file using NotesStream. The agent associates one stream with an existing file and a second stream with a new file. The agent reads blocks of bytes from the first stream and writes them to the second stream until end of stream occurs on the first stream.
Sub Initialize
REM Set names of input and output files
Const DIRECTORY = "c:\StreamFiles\"
Const FILENAME = "domobj"
Const EXT = ".tlb"
Dim inPath As String, outPath As String
inPath = DIRECTORY & FILENAME & EXT
outPath = DIRECTORY & FILENAME & ".txt"
Dim session As NotesSession
Dim inStream As NotesStream, outStream As NotesStream
Set session = New NotesSession
REM Get the input file
Set inStream = session.CreateStream
If Not inStream.Open(inPath, "binary") Then
Messagebox inPath,, "Open failed"
Exit Sub
End If
If inStream.Bytes = 0 Then
Messagebox inPath,, "File has no content"
Exit Sub
End If
REM Get the output file
Set outStream = session.CreateStream
If Not outStream.Open(outPath, "binary") Then
Messagebox outPath,, "Open failed"
Exit Sub
End If
If outStream.Bytes <> 0 Then
Messagebox outPath,, "File exists and has content"
Exit Sub
End If
REM Transfer input file to output file
Do
buffer = inStream.Read(32767)
Call outStream.Write(buffer)
Loop Until inStream.IsEOS
Call inStream.Close
Call outStream.Close
End Sub
2. This agent adds some processing to the first example. It copies only letters and numbers from the first file to the new file, inserting a space whenever a sequence of non-alphanumeric bytes occurs.
Sub Initialize
REM Set names of input and output files
Const DIRECTORY = "c:\StreamFiles\"
Const FILENAME = "domobj"
Const EXT = ".tlb"
Dim inPath As String, outPath As String
inPath = DIRECTORY & FILENAME & EXT
outPath = DIRECTORY & FILENAME & ".txt"
Dim session As NotesSession
Dim inStream As NotesStream, outStream As NotesStream
Dim inBuff As Variant, outBuff() As Byte
Set session = New NotesSession
REM Get the input file
Set inStream = session.CreateStream
If Not inStream.Open(inPath, "binary") Then
Messagebox inPath,, "Open failed"
Exit Sub
End If
If inStream.Bytes = 0 Then
Messagebox inPath,, "File has no content"
Exit Sub
End If
REM Get the output file
Set outStream = session.CreateStream
If Not outStream.Open(outPath, "binary") Then
Messagebox outPath,, "Open failed"
Exit Sub
End If
If outStream.Bytes <> 0 Then
Messagebox outPath,, "File exists and has content"
Exit Sub
End If
REM Transfer input file to output file
prevChar = True
Do
inBuff = inStream.Read(32767)
counter% = 0
REM Put alphanumeric characters in write buffer
REM First insert a space if the previous byte
REM is not alphanumeric
Forall b In inBuff
If (b >= 49 And b <= 57) _
Or (b >= 65 And b <= 90) _
Or (b >= 97 And b <= 122) Then
If Not prevChar Then
Redim Preserve outBuff(0 To counter%)
outBuff(counter%) = 32
counter% = counter% + 1
prevChar = True
End If
Redim Preserve outBuff(0 To counter%)
outBuff(counter%) = b
counter% = counter% + 1
Else
prevChar = False
End If
End Forall
Call outStream.Write(outBuff)
Loop Until inStream.IsEOS
Call inStream.Close
Call outStream.Close
End Sub
See Also
Read method
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Feedback on
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