using System . Runtime . InteropServices;

[ StructLayout ( LayoutKind . Sequential)]

public class INTERNET_CACHE_ENTRY_INFOW

{

    public uint dwStructSize;

    public string lpszSourceUrlName;

    public string lpszLocalFileName;

    public uint CacheEntryType;

    public uint dwUseCount;

    public uint dwHitRate;

    public uint dwSizeLow;

    public uint dwSizeHigh;

    public FILETIME LastModifiedTime;

    public FILETIME ExpireTime;

    public FILETIME LastAccessTime;

    public FILETIME LastSyncTime;

    public IntPtr lpHeaderInfo;

    public uint dwHeaderInfoSize;

    public string lpszFileExtension;

    public uint dwReserved; //union uint dwExemptDelta;

}

[ DllImport ( "wininet.dll" )]

public static extern IntPtr FindFirstUrlCacheEntryEx(

  string lpszUrlSearchPattern,

  uint dwFlags,

  uint dwFilter,

  Int64 GroupId,

  IntPtr lpFirstCacheEntryInfo,

  ref uint lpdwFirstCacheEntryInfoBufferSize,

  Pointer lpGroupAttributes,

  Pointer pcbGroupAttributes,

  Pointer lpReserved

);

[ DllImport ( "wininet.dll" )]

public static extern bool FindCloseUrlCache( IntPtr hEnumHandle);

[ DllImport ( "wininet.dll" )]

public static extern bool FindNextUrlCacheEntryEx(

    IntPtr hEnumHandle,

    IntPtr lpFirstCacheEntryInfo,

    ref uint lpdwFirstCacheEntryInfoBufferSize,

    Pointer lpGroupAttributes,

    Pointer pcbGroupAttributes,

    Pointer lpReserved);

public uint NORMAL_CACHE_ENTRY = 0x00000001 ;

private void button1_Click( object sender , EventArgs e)

{

    IntPtr vHandle;

    INTERNET_CACHE_ENTRY_INFOW vInternetCacheEntryInfo = new INTERNET_CACHE_ENTRY_INFOW ();

    uint vFirstCacheEntryInfoBufferSize = 0 ;

   FindFirstUrlCacheEntryEx( null , 0 , NORMAL_CACHE_ENTRY, 0 , ( IntPtr ) null ,

        ref vFirstCacheEntryInfoBufferSize, null , null , null );

    IntPtr vBuffer = Marshal . AllocHGlobal(( int )vFirstCacheEntryInfoBufferSize);

   vHandle = FindFirstUrlCacheEntryEx( null , 0 , NORMAL_CACHE_ENTRY, 0 ,

      vBuffer, ref vFirstCacheEntryInfoBufferSize,

      null , null , null );

    while (vHandle != null )

   {

        Marshal . PtrToStructure(vBuffer, vInternetCacheEntryInfo);

       richTextBox1 . AppendText(vInternetCacheEntryInfo . lpszSourceUrlName + "\r\n" );

        Marshal . FreeCoTaskMem(vBuffer);

       FindNextUrlCacheEntryEx(vHandle, ( IntPtr ) null , ref vFirstCacheEntryInfoBufferSize,

          null , null , null );

       vBuffer = Marshal . AllocHGlobal(( int )vFirstCacheEntryInfoBufferSize);

        if ( ! FindNextUrlCacheEntryEx(vHandle, vBuffer,

          ref vFirstCacheEntryInfoBufferSize, null , null , null )) break ;

   }

    Marshal . FreeCoTaskMem(vBuffer);

}