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How to tell if a String is Unicode

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Submitted on: 1/4/2015 10:19:00 PM
By: VBRocks (from psc cd)  
Level: Advanced
User Rating: By 2 Users
Compatibility: VB.NET
Views: 2061
 
     Identifies whether a string is encoded in Unicode.
 
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//**************************************
// Name: How to tell if a String is Unicode
// Description:Identifies whether a string is encoded in Unicode.
// By: VBRocks (from psc cd)
//
// Inputs:String.
//
// Returns:Boolean: True or False
//
// Assumes:Call the function passing it a string and it will return True if the String is encoded in Unicode, False if not.
//
// Side Effects:None.
//**************************************

Private Function IsStringUnicode(ByVal str As String) As Boolean
 'Set it to False by default
 Dim bIsUnicode As Boolean = False
 'Setup Encodings
 Dim EncDefault As System.Text.Encoding = System.Text.Encoding.GetEncoding(0) 'String Default Encoding
 Dim EncUnicode As System.Text.Encoding = System.Text.Encoding.Unicode'Encoding
 Dim bitesDefault As Byte() = EncDefault.GetBytes(str) 'Get the bytes of the string using the string's default encoding
 Dim bitesUnicode As Byte() = EncUnicode.GetBytes(str)
 Dim charsDefault As Char() = EncDefault.GetChars(bitesDefault) 'Get the characters of the default string
 Dim charsUnicode As Char() = EncUnicode.GetChars(bitesUnicode) 'Get the characters in unicode
 'Loop through all the characters and see if they all match.
 ' if any do not match, then it's unicode
 For i As Integer = 0 To charsDefault.Length - 1
If charsDefault(i) <> charsUnicode(i) Then
bIsUnicode = True
'we found one that doesn't match, so exit the loop
Exit For
End If
 Next
 Return bIsUnicode
 End Function


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