C# Signature:

[DllImport ( "Shlwapi.dll", CharSet = CharSet.Auto )]
public static extern long StrFormatByteSize (
        long fileSize
        , [MarshalAs ( UnmanagedType.LPTStr )] StringBuilder buffer
        , int bufferSize );

VB Signature:

Declare Function StrFormatByteSize Lib "shlwapi.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

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Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

long filelength = 123456789;
StringBuilder sb = new StringBuilder ();
Explorer.StrFormatByteSize ( filelength, sb, 20 );    // this is not a magic number. I think 8 is the minimum
Console.WriteLine ( sb );

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