internal static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, int cbSizeFileInfo, int uFlags);
public static Icon GetWindowIcon(IntPtr handle, bool small)
{
int processId;
NativeMethods.GetWindowThreadProcessId(handle, out processId);
var hInstance = NativeMethods.OpenProcess(0, false, processId);
var fileName = new StringBuilder(256);
var ret = NativeMethods.GetModuleFileName(IntPtr.Zero, fileName, fileName.Capacity);
if (ret <= 0)
{
return null;
}
if (ret > fileName.Capacity)
{
throw new PathTooLongException("Assembly name is longer than MAX_PATH.");
}
var shinfo = new SHFILEINFO();
NativeMethods.SHGetFileInfo(fileName.ToString(), 0, ref shinfo, Marshal.SizeOf(shinfo), SHGFI_ICON | (small ? SHGFI_SMALLICON : SHGFI_LARGEICON));
NativeMethods.CloseHandle(hInstance);
if (shinfo.Icon != IntPtr.Zero)
{
return Icon.FromHandle(shinfo.Icon);
}
var hParent = handle;
while (hParent != IntPtr.Zero)
{
var hIcon = NativeMethods.SendMessage(hParent, (int)WM.GETICON, small ? ICON_SMALL : ICON_BIG, 0);
if (hIcon != IntPtr.Zero)
{
return Icon.FromHandle(hIcon);
}
hParent = NativeMethods.GetParent(hParent);
}
return null;
}
