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Visual Basic 4 / 5 / 6 Discussion Thread
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Jun 1st, 2006

Unicode and Strings

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Given the following two code snippets, how come I get different output?

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Sub test() Dim str As String Dim b() As Byte str = "hello" b() = str str = "" For i = LBound(b) To UBound(b)     str = str & b(i) & " " Next i Debug.Print str End Sub
Sub test() Dim str As String Dim b() As Byte str = "hello" b() = str str = "" For i = LBound(b) To UBound(b)     str = str & b(i) & " " Next i Debug.Print str End Sub

The above produces the following output:

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
104 0 101 0 108 0 108 0 111 0
104 0 101 0 108 0 108 0 111 0

second procedure:

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Sub test2() Dim str As String Dim b() As Byte str = "hello" b() = StrConv(str, vbUnicode) str = "" For i = LBound(b) To UBound(b)     str = str & b(i) & " " Next i Debug.Print str End Sub
Sub test2() Dim str As String Dim b() As Byte str = "hello" b() = StrConv(str, vbUnicode) str = "" For i = LBound(b) To UBound(b)     str = str & b(i) & " " Next i Debug.Print str End Sub

Which produces this output:

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
104 0 0 0 101 0 0 0 108 0 0 0 108 0 0 0 111 0 0 0
104 0 0 0 101 0 0 0 108 0 0 0 108 0 0 0 111 0 0 0

My question is: why the additional zeroes from the second procedure? Assigning a string to a byte array fills the byte array with the unicode characters, and I thought this was essentially what the StrConv function did (with vbUnicode option). Can anyone settle my curiosity? Thanks for any/all replies! Richard

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RichardSchollar

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Jun 1st, 2006

Re: Unicode and Strings

Hmn...
http://www.di-mgt.com.au/strconv.html
http://www.vb.mvps.org/hardcore/html/whatisunicode.htm
and
http://blogs.msdn.com/michkap/archiv...28/486019.aspx

Comatose

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Jun 2nd, 2006

Re: Unicode and Strings

Comatose - many thanks for the links. The last one was exceptionally helpful. That has sorted out a problem I was seriously confused by. Thanks again!Richard

RichardSchollar

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Jun 2nd, 2006

Re: Unicode and Strings

You're Welcome!

Comatose

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