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StrCmpLogicalW (shlwapi)
.
C# Signature:
[DllImport("shlwapi.dll", CharSet=CharSet.Unicode, ExactSpelling=true)]
static extern int StrCmpLogicalW(string x, string y);
VB Signature:
Declare Unicode Function StrCmpLogicalW Lib "shlwapi.dll" (ByVal s1 As String, ByVal s2 As String) As Int32
User-Defined Types:
None.
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
Comparison is case insensitive, numbers are treated by numerical value instead of ASCII code, for example:
File1
fIle2
fiLe10
instead of
File1
fiLe10
fIle2
Tips & Tricks:
Please add some!
C# Sample Code:
public class StringLogicalComparer : Comparer<string>
{
[DllImport("shlwapi.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
private static extern int StrCmpLogicalW(string x, string y);
public override int Compare(string x, string y)
{
return StrCmpLogicalW(x, y);
}
}
Or, since C# 8:
public class StringLogicalComparer : Comparer<string>
{
[DllImport("shlwapi.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
private static extern int StrCmpLogicalW(string? x, string? y);
public override int Compare(string? x, string? y) => StrCmpLogicalW(x, y);
}
VB Sample Code:
Private Class StringLogicalComparer
Inherits Comparer(Of String)
Private Declare Unicode Function StrCmpLogicalW Lib "shlwapi" _
(ByVal s1 As String, ByVal s2 As String) As Integer
Public Overrides Function Compare(ByVal x As String, ByVal y As String) _
As Integer _
Return StrCmpLogicalW(x, y)
End Function
End Class
Private Sub Test()
Dim cp As New StringLogicalComparer
Debug.WriteLine(cp.Compare("a", "a")) ' 0
Debug.WriteLine(cp.Compare("1", "1")) ' 0
Debug.WriteLine(cp.Compare("a1", "a2")) ' -1
Debug.WriteLine(cp.Compare("a10", "a2")) ' +1
End Sub
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