.

Summary

The GetFileSizeEx API

C# Signature:

[DllImport("kernel32.dll")]
static extern bool GetFileSizeEx(IntPtr hFile, out long lpFileSize);

VB.Net Signature:

<DllImport("kernel32.dll",CharSet:=CharSet.Auto)> _
Public Shared Function GetFileSizeEx( _
                <[In]()> ByVal hFile As IntPtr, _
                <[In](), Out()> ByRef lpFileSize As Long) As Boolean

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

C#

        IntPtr handle = CreateFile(
        PathString,
        GENERIC_READ,
        FILE_SHARE_READ,
        0,
        OPEN_EXISTING,
        FILE_ATTRIBUTE_READONLY,
        0); //PInvoked too

        if (handle.ToInt32() == -1)
        {
        return;
        }
        long fileSize;
        bool result = GetFileSizeEx(handle, out fileSize);
        if (!result)
        {
        return;
        }

Alternative Managed API:

class System.IO.FileInfo, member Length.

Documentation

GetFileSizeEx on MSDN