public static Icon GetIcon(int index, bool small)
{
IntPtr iconPtr;
if (small)
{
iconPtr = NativeShellAPI.ImageList_GetIcon(smallImageListHandle, index, NativeShellAPI.ILD.NORMAL);
}
else
{
iconPtr = NativeShellAPI.ImageList_GetIcon(largeImageListHandle, index, NativeShellAPI.ILD.NORMAL);
}
if (iconPtr != IntPtr.Zero)
{
Icon icon = Icon.FromHandle(iconPtr);
Icon retVal = (Icon)icon.Clone();
NativeShellAPI.DestroyIcon(iconPtr);
return(retVal);
}
else
{
return(null);
}
}
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
NativeShellAPI.SHGFI dwflag = NativeShellAPI.SHGFI.SYSICONINDEX | NativeShellAPI.SHGFI.PIDL | NativeShellAPI.SHGFI.ICON;
NativeShellAPI.FILE_ATTRIBUTE dwAttr = 0;
//build Key into HashTable for this Item
int Key = index * 256;
if (item.IsLink)
{
Key = Key | 1;
dwflag = dwflag | NativeShellAPI.SHGFI.LINKOVERLAY;
HasOverlay = true;
}
if (item.IsShared)
{
Key = Key | 2;
dwflag = dwflag | NativeShellAPI.SHGFI.ADDOVERLAYS;
HasOverlay = true;
}
if (SelectedIcon)
{
Key = Key | 4;
dwflag = dwflag | NativeShellAPI.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 | NativeShellAPI.SHGFI.USEFILEATTRIBUTES;
dwAttr = dwAttr | NativeShellAPI.FILE_ATTRIBUTE.NORMAL;
}
PIDL pidlFull = item.PIDLFull;
NativeShellAPI.SHFILEINFO shfiSmall = new NativeShellAPI.SHFILEINFO();
NativeShellAPI.SHGetFileInfo(pidlFull.Ptr, dwAttr, ref shfiSmall, NativeShellAPI.cbFileInfo, dwflag | NativeShellAPI.SHGFI.SMALLICON);
NativeShellAPI.SHFILEINFO shfiLarge = new NativeShellAPI.SHFILEINFO();
NativeShellAPI.SHGetFileInfo(pidlFull.Ptr, dwAttr, ref shfiLarge, NativeShellAPI.cbFileInfo, dwflag | NativeShellAPI.SHGFI.LARGEICON);
Marshal.FreeCoTaskMem(pidlFull.Ptr);
lock (imageTable)
{
rVal = NativeShellAPI.ImageList_ReplaceIcon(smallImageListHandle, -1, shfiSmall.hIcon);
NativeShellAPI.ImageList_ReplaceIcon(largeImageListHandle, -1, shfiLarge.hIcon);
}
NativeShellAPI.DestroyIcon(shfiSmall.hIcon);
NativeShellAPI.DestroyIcon(shfiLarge.hIcon);
imageTable[Key] = rVal;
}
if (SelectedIcon)
{
item.SelectedImageIndex = rVal;
}
else
{
item.ImageIndex = rVal;
}
}