C# Signature:

[DllImport("coredll.dll", SetLastError=true, CharSet=CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
   static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
   out ulong lpFreeBytesAvailable,
   out ulong lpTotalNumberOfBytes,
   out ulong lpTotalNumberOfFreeBytes);

VB.Net Signature:

    <DllImport("coredll.dll", EntryPoint:="GetDiskFreeSpaceEx", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Function GetDiskFreeSpaceEx( _
    ByVal lpDirectoryName As String, _
    ByRef lpFreeBytesAvailable As ULong, _
    ByRef lpTotalNumberOfBytes As ULong, _
    ByRef lpTotalNumberOfFreeBytes As ULong) As Boolean
    End Function

or

    Declare Function GetDiskFreeSpaceEx Lib "CoreDll.dll" ( _
        ByVal lpDirectoryName As String, _
        ByRef lpFreeBytesAvailable As UInt64, _
        ByRef lpTotalNumberOfBytes As UInt64, _
        ByRef lpTotalNumberOfFreeBytes As UInt64) As Integer

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

VB.NET does not require "\\" to specify "\", so for example in VB on a device

        iret = GetDiskFreeSpaceEx("\", Freebytes, TotalBytes, TotalFreebytes)

Sample Code:

ulong FreeBytesAvailable;
ulong TotalNumberOfBytes;
ulong TotalNumberOfFreeBytes;

bool success = GetDiskFreeSpaceEx("C:\\", out FreeBytesAvailable, out TotalNumberOfBytes,
                   out TotalNumberOfFreeBytes);
if (!success)
    throw new System.ComponentModel.Win32Exception();

Console.WriteLine("Free Bytes Available:      {0,15:D}", FreeBytesAvailable);
Console.WriteLine("Total Number Of Bytes:     {0,15:D}", TotalNumberOfBytes);
Console.WriteLine("Total Number Of FreeBytes: {0,15:D}", TotalNumberOfFreeBytes);

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).