/// <summary>
/// Returns the index of the icon for the specified file
/// </summary>
/// <param name="fileName">Filename to get icon for</param>
/// <param name="forceLoadFromDisk">If True, then hit the disk to get the icon,
/// otherwise only hit the disk if no cached icon is available.</param>
/// <param name="iconState">Flags specifying the state of the icon
/// returned.</param>
/// <returns>Index of the icon</returns>
public int IconIndex(
string fileName,
bool forceLoadFromDisk,
ShellIconStateConstants iconState
)
{
var dwFlags = ShGetFileInfoConstants.ShgfiSysiconindex;
var dwAttr = 0;
if (_size == SysImageListSize.SmallIcons)
{
dwFlags |= ShGetFileInfoConstants.ShgfiSmallicon;
}
// We can choose whether to access the disk or not. If you don't
// hit the disk, you may get the wrong icon if the icon is
// not cached. Also only works for files.
if (!forceLoadFromDisk)
{
dwFlags |= ShGetFileInfoConstants.ShgfiUsefileattributes;
dwAttr = FileAttributeNormal;
}
else
{
dwAttr = 0;
}
// sFileSpec can be any file. You can specify a
// file that does not exist and still get the
// icon, for example sFileSpec = "C:\PANTS.DOC"
var shfi = new Shfileinfo();
var shfiSize = (uint)Marshal.SizeOf(shfi.GetType());
var retVal = SHGetFileInfo(
fileName, dwAttr, ref shfi, shfiSize,
((uint)(dwFlags) | (uint)iconState));
if (retVal.Equals(IntPtr.Zero))
{
System.Diagnostics.Debug.Assert((!retVal.Equals(IntPtr.Zero)), "Failed to get icon index");
return(0);
}
return(shfi.iIcon);
}
/// <summary>
/// Creates the SystemImageList
/// </summary>
private void Create()
{
// forget last image list if any:
_hIml = IntPtr.Zero;
if (IsXpOrAbove())
{
// Get the System IImageList object from the Shell:
var iidImageList = new Guid("46EB5926-582E-4017-9FDF-E8998DAA0950");
var ret = SHGetImageList(
(int)_size,
ref iidImageList,
ref _iImageList
);
// the image list handle is the IUnknown pointer, but
// using Marshal.GetIUnknownForObject doesn't return
// the right value. It really doesn't hurt to make
// a second call to get the handle:
SHGetImageListHandle((int)_size, ref iidImageList, ref _hIml);
}
else
{
// Prepare flags:
var dwFlags = ShGetFileInfoConstants.ShgfiUsefileattributes | ShGetFileInfoConstants.ShgfiSysiconindex;
if (_size == SysImageListSize.SmallIcons)
{
dwFlags |= ShGetFileInfoConstants.ShgfiSmallicon;
}
// Get image list
var shfi = new Shfileinfo();
var shfiSize = (uint)Marshal.SizeOf(shfi.GetType());
// Call SHGetFileInfo to get the image list handle
// using an arbitrary file:
_hIml = SHGetFileInfo(
".txt",
FileAttributeNormal,
ref shfi,
shfiSize,
(uint)dwFlags);
System.Diagnostics.Debug.Assert((_hIml != IntPtr.Zero), "Failed to create Image List");
}
}
/// <summary>
/// Gets the information for the specified
/// file name and flags.
/// </summary>
public void GetInfo()
{
_fileIcon = null;
_typeName = "";
_displayName = "";
Shfileinfo shfi = new Shfileinfo();
uint shfiSize = (uint)Marshal.SizeOf(shfi.GetType());
int ret = SHGetFileInfo(
_fileName, 0, ref shfi, shfiSize, (uint)(_flags));
if (ret != 0)
{
if (shfi.hIcon != IntPtr.Zero)
{
_fileIcon = System.Drawing.Icon.FromHandle(shfi.hIcon);
// Now owned by the GDI+ object
//DestroyIcon(shfi.hIcon);
}
_typeName = shfi.szTypeName;
_displayName = shfi.szDisplayName;
}
else
{
int err = GetLastError();
Console.WriteLine("Error {0}", err);
string txtS = new string('\0', 256);
int len = FormatMessage(
FormatMessageFromSystem | FormatMessageIgnoreInserts,
IntPtr.Zero, err, 0, txtS, 256, 0);
Console.WriteLine("Len {0} text {1}", len, txtS);
// throw exception
}
}
