private static IntPtr CreateMenuCallbackWnd(WinAPI.IContextMenu2 contextMenu)
{
string icmCallbackWnd = "ICMCALLBACKWND";
WinAPI.WNDCLASS wclass = new WinAPI.WNDCLASS();
wclass.lpszClassName = icmCallbackWnd;
wclass.lpfnWndProc = Marshal.GetFunctionPointerForDelegate(MenuCallbackDelegate);
wclass.hInstance = IntPtr.Zero;
int r = WinAPI.RegisterClassW(ref wclass);
IntPtr result = WinAPI.CreateWindowEx(0, icmCallbackWnd, icmCallbackWnd, WinAPI.WindowStyles.WS_POPUPWINDOW,
0, 0, 0, 0, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, Marshal.GetIUnknownForObject(contextMenu));
return(result);
}
private static void ShowShellContextMenu(IEnumerable <string> paths, IntPtr windowHandle, IntVector2 mousePos)
{
WinAPI.IShellFolder desktop = null;
var pathPIDL = IntPtr.Zero;
WinAPI.IShellFolder shellFolder = null;
uint pchEaten = 0;
WinAPI.SFGAO attr = 0;
IntPtr ppv;
var filePIDL = IntPtr.Zero;
WinAPI.IContextMenu iCMenu = null;
var shellContextMenu = IntPtr.Zero;
var callbackWnd = IntPtr.Zero;
WinAPI.IContextMenu2 iCMenu2 = null;
Action Finalize = () => {
if (iCMenu2 != null)
{
Marshal.FinalReleaseComObject(iCMenu2);
}
if (iCMenu != null)
{
Marshal.FinalReleaseComObject(iCMenu);
}
if (shellFolder != null)
{
Marshal.FinalReleaseComObject(shellFolder);
}
if (desktop != null)
{
Marshal.FinalReleaseComObject(desktop);
}
if (filePIDL != IntPtr.Zero)
{
WinAPI.CoTaskMemFree(filePIDL);
}
if (pathPIDL != IntPtr.Zero)
{
WinAPI.CoTaskMemFree(pathPIDL);
}
if (shellContextMenu != IntPtr.Zero)
{
WinAPI.DestroyMenu(shellContextMenu);
}
if (callbackWnd != IntPtr.Zero)
{
WinAPI.DestroyWindow(callbackWnd);
}
};
Action <int> checkHResult = (result) => {
if (result != 0)
{
Finalize();
Marshal.ThrowExceptionForHR(result);
}
};
int r = 0;
var pidls = new List <IntPtr>();
foreach (var path in paths)
{
string dir = Path.GetDirectoryName(path) ?? "";
string filename = Path.GetFileNameWithoutExtension(path);
string fileExt = Path.GetExtension(path);
string pathRoot = Path.GetPathRoot(path);
if (!dir.StartsWith(pathRoot))
{
dir = Path.Combine(pathRoot, dir);
}
if (!string.IsNullOrEmpty(filename) && !string.IsNullOrEmpty(fileExt))
{
filename += fileExt;
}
r = WinAPI.SHGetDesktopFolder(out desktop);
checkHResult(r);
if (string.IsNullOrEmpty(filename))
{
r = WinAPI.SHGetSpecialFolderLocation(IntPtr.Zero, WinAPI.CSIDL.CSIDL_DRIVES, ref pathPIDL);
checkHResult(r);
r = desktop.BindToObject(pathPIDL, IntPtr.Zero, ref WinAPI.Guid_IShellFolder.IID_IShellFolder, out ppv);
checkHResult(r);
shellFolder = (WinAPI.IShellFolder)Marshal.GetObjectForIUnknown(ppv);
r = shellFolder.ParseDisplayName(windowHandle, IntPtr.Zero, dir, ref pchEaten, out filePIDL, ref attr);
checkHResult(r);
}
else
{
r = desktop.ParseDisplayName(windowHandle, IntPtr.Zero, dir, ref pchEaten, out pathPIDL, ref attr);
checkHResult(r);
r = desktop.BindToObject(pathPIDL, IntPtr.Zero, ref WinAPI.IID_IShellFolder, out ppv);
checkHResult(r);
shellFolder = (WinAPI.IShellFolder)Marshal.GetObjectForIUnknown(ppv);
r = shellFolder.ParseDisplayName(windowHandle, IntPtr.Zero, filename, ref pchEaten, out filePIDL, ref attr);
checkHResult(r);
}
pidls.Add(filePIDL);
}
r = shellFolder.GetUIObjectOf(windowHandle, (uint)pidls.Count, ref pidls.ToArray()[0], ref WinAPI.IID_IContextMenu, 0, out ppv);
checkHResult(r);
iCMenu = (WinAPI.IContextMenu)Marshal.GetObjectForIUnknown(ppv);
shellContextMenu = WinAPI.CreatePopupMenu();
r = iCMenu.QueryContextMenu(shellContextMenu, 0, 1, 0x7FFF, WinAPI.CMF.CMF_EXPLORE);
if ((r & 0x80000000) == 0)
{
var ppv2 = IntPtr.Zero;
Marshal.QueryInterface(ppv, ref WinAPI.IID_IContextMenu2, out ppv2);
iCMenu2 = (WinAPI.IContextMenu2)Marshal.GetObjectForIUnknown(ppv2);
callbackWnd = CreateMenuCallbackWnd(iCMenu2);
var popupMenuResult = WinAPI.TrackPopupMenuEx(shellContextMenu,
WinAPI.TPM_LEFTALIGN | WinAPI.TPM_LEFTBUTTON | WinAPI.TPM_RIGHTBUTTON | WinAPI.TPM_RETURNCMD,
mousePos.X, mousePos.Y, callbackWnd, IntPtr.Zero);
if (popupMenuResult > 0)
{
var iCmd = popupMenuResult - 1;
var CMD = new WinAPI.CMINVOKECOMMANDINFO {
cbSize = (uint)Marshal.SizeOf(typeof(WinAPI.CMINVOKECOMMANDINFO)),
hwnd = windowHandle,
verb = (IntPtr)iCmd,
nShow = 1, // SW_SHOWNORMAL
};
r = iCMenu.InvokeCommand(ref CMD);
checkHResult(r);
}
}
Finalize();
}