protected static ShellDll.ShellAPI.SFGAO shGetFileAttribute(PIDL pidl, ShellDll.ShellAPI.SFGAO lookup)
{
ShellAPI.SHFILEINFO shfi = new ShellAPI.SHFILEINFO();
shfi.dwAttributes = ShellAPI.SFGAO.READONLY | ShellAPI.SFGAO.HIDDEN | ShellAPI.SFGAO.BROWSABLE |
ShellAPI.SFGAO.FILESYSTEM | ShellAPI.SFGAO.HASSUBFOLDER;
ShellAPI.SHGFI dwFlag = ShellAPI.SHGFI.PIDL | ShellAPI.SHGFI.ATTRIBUTES | ShellAPI.SHGFI.ATTR_SPECIFIED | ShellAPI.SHGFI.USEFILEATTRIBUTES;
ShellAPI.FILE_ATTRIBUTE dwAttr = 0;
int cbFileInfo = Marshal.SizeOf(shfi.GetType());
IntPtr retPtr = ShellAPI.SHGetFileInfo(pidl.Ptr, dwAttr, ref shfi, cbFileInfo, dwFlag);
if (retPtr.ToInt32() != ShellAPI.S_OK && retPtr.ToInt32() != 1)
{
Marshal.ThrowExceptionForHR(retPtr.ToInt32());
}
return(shfi.dwAttributes);
}
public static extern IntPtr SHGetFileInfo(IntPtr ppidl, ShellAPI.FILE_ATTRIBUTE dwFileAttributes, ref ShellAPI.SHFILEINFO sfi, int cbFileInfo, ShellAPI.SHGFI uFlags);
internal static void SetIconIndex(ShellItem item, int index, bool SelectedIcon)
{
bool HasOverlay = false; //true if it's an overlay
int rVal = 0; //The returned Index
ShellAPI.SHGFI dwflag = ShellAPI.SHGFI.SYSICONINDEX | ShellAPI.SHGFI.PIDL | ShellAPI.SHGFI.ICON;
ShellAPI.FILE_ATTRIBUTE dwAttr = 0;
//build Key into HashTable for this Item
int Key = index * 256;
if (item.IsLink)
{
Key = Key | 1;
dwflag = dwflag | ShellAPI.SHGFI.LINKOVERLAY;
HasOverlay = true;
}
if (item.IsShared)
{
Key = Key | 2;
dwflag = dwflag | ShellAPI.SHGFI.ADDOVERLAYS;
HasOverlay = true;
}
if (SelectedIcon)
{
Key = Key | 4;
dwflag = dwflag | ShellAPI.SHGFI.OPENICON;
HasOverlay = true; //not really an overlay, but handled the same
}
if (imageTable.ContainsKey(Key))
{
rVal = (int)imageTable[Key];
}
else if (!HasOverlay && !item.IsHidden) //for non-overlay icons, we already have
{
rVal = (int)System.Math.Floor((double)Key / 256); // the right index -- put in table
imageTable[Key] = rVal;
}
else //don't have iconindex for an overlay, get it.
{
if (item.IsFileSystem & !item.IsDisk & !item.IsFolder)
{
dwflag = dwflag | ShellAPI.SHGFI.USEFILEATTRIBUTES;
dwAttr = dwAttr | ShellAPI.FILE_ATTRIBUTE.NORMAL;
}
PIDL pidlFull = item.PIDLFull;
ShellAPI.SHFILEINFO shfiSmall = new ShellAPI.SHFILEINFO();
ShellAPI.SHGetFileInfo(pidlFull.Ptr, dwAttr, ref shfiSmall, ShellAPI.cbFileInfo, dwflag | ShellAPI.SHGFI.SMALLICON);
ShellAPI.SHFILEINFO shfiLarge = new ShellAPI.SHFILEINFO();
ShellAPI.SHGetFileInfo(pidlFull.Ptr, dwAttr, ref shfiLarge, ShellAPI.cbFileInfo, dwflag | ShellAPI.SHGFI.LARGEICON);
Marshal.FreeCoTaskMem(pidlFull.Ptr);
lock (imageTable)
{
rVal = ShellAPI.ImageList_ReplaceIcon(smallImageListHandle, -1, shfiSmall.hIcon);
ShellAPI.ImageList_ReplaceIcon(largeImageListHandle, -1, shfiLarge.hIcon);
}
ShellAPI.DestroyIcon(shfiSmall.hIcon);
ShellAPI.DestroyIcon(shfiLarge.hIcon);
imageTable[Key] = rVal;
}
if (SelectedIcon)
{
item.SelectedImageIndex = rVal;
}
else
{
item.ImageIndex = rVal;
}
}
/// <summary>
/// Returns the icon index for the given ShellItem.
/// </summary>
/// <param name="item">
/// ShellItem for which the icon index is calculated.
/// </param>
/// <param name="selected">
/// True if the item is selected, false otherwise.
/// </param>
public int GetIconIndex(ShellItem item, bool selected)
{
bool hasOverlay = false;
int index = item.ImageIndex;
int res;
ShellAPI.FILE_ATTRIBUTE dwFileAttrib = 0;
ShellAPI.SHGFI uFlags = ShellAPI.SHGFI.ICON |
ShellAPI.SHGFI.PIDL |
ShellAPI.SHGFI.SYSICONINDEX;
int key = item.ImageIndex << 8;
// check for overlays
if (item.IsLink)
{
key = key | 1;
uFlags = uFlags | ShellAPI.SHGFI.LINKOVERLAY;
hasOverlay = true;
}
if (item.IsShared)
{
key = key | 2;
uFlags = uFlags | ShellAPI.SHGFI.ADDOVERLAYS;
hasOverlay = true;
}
// not really an overlay, but handled the same
if (selected)
{
key = key | 4;
uFlags = uFlags | ShellAPI.SHGFI.OPENICON;
hasOverlay = true;
}
if (imageTable.ContainsKey(key))
{
res = (int)imageTable[key];
} // for non-overlay icons we already have the index
else if (!hasOverlay && !item.IsHidden)
{
res = index;
imageTable[key] = index;
} // don't have icon index for an overlay
else
{
if (item.IsFileSystem && !item.IsDisk && !item.IsFolder)
{
uFlags |= ShellAPI.SHGFI.USEFILEATTRIBUTES;
dwFileAttrib = ShellAPI.FILE_ATTRIBUTE.NORMAL;
}
ShellAPI.SHFILEINFO sfiSmall = new ShellAPI.SHFILEINFO();
ShellAPI.SHGetFileInfo(item.FullPidl, dwFileAttrib, ref sfiSmall, ShellAPI.cbFileInfo, uFlags | ShellAPI.SHGFI.SMALLICON);
ShellAPI.SHFILEINFO sfiLarge = new ShellAPI.SHFILEINFO();
ShellAPI.SHGetFileInfo(item.FullPidl, dwFileAttrib, ref sfiLarge, ShellAPI.cbFileInfo, uFlags | ShellAPI.SHGFI.LARGEICON);
lock (padlock)
{
// add overlaid icon to the image list
res = ShellAPI.ImageList_ReplaceIcon(smallImageListHandle, -1, sfiSmall.hIcon);
ShellAPI.ImageList_ReplaceIcon(largeImageListHandle, -1, sfiLarge.hIcon);
}
ShellAPI.DestroyIcon(sfiSmall.hIcon);
ShellAPI.DestroyIcon(sfiLarge.hIcon);
imageTable[key] = res;
}
return(res);
}
