InsertMenuItem WinAPI problem

[Nematjon Rahmanov]

Hi ! I'm working shell context menu on 64 pc. I rebuild app under x64 pc. I want add menu item to windows context menu.Registery is OK and windows explorer find my dll. But InsertMenuItem WinAPI function not working!

MENUITEMINFO mii = new MENUITEMINFO();
mii.cbSize =(uint)Marshal.SizeOf(typeof(MENUITEMINFO));// 0x30;
mii.fMask = (uint)MIIM.TYPE | (uint)MIIM.STATE |(uint)MIIM.SUBMENU;
mii.fType =(uint) MF.STRING;
mii.wID = idCmdFirst + num;
mii.dwTypeData = "My menu text";
mii.fState =(uint)MF.ENABLED;
mii.cch = (uint)mii.dwTypeData.Length;

InsertMenuItem(hmenu, iMenu+1, true, ref mii);

My defenition :

[DllImport("user32.dll")]
public static extern bool InsertMenuItem(uint hMenu, uint uItem, bool fByPosition,[In] ref MENUITEMINFO lpmii);

[StructLayout(LayoutKind.Sequential)]
public struct MENUITEMINFO
{
public uint cbSize;
public uint fMask;
public uint fType;
public uint fState;
public int wID;
public int hSubMenu;
public int hbmpChecked;
public int hbmpUnchecked;
public int dwItemData;
public String dwTypeData;
public uint cch;
public int hbmpItem;
}

Please help me. (I know writing shell menu under .net is not good,but i very want see it). Thanks.

We are haven't bug,just temporarily undecided problems.

[Luc Pattyn]

In Win64 all pointers take 64 bits, hence uint hMenu is wrong in public static extern bool InsertMenuItem(uint hMenu, uint uItem, bool fByPosition,[In] ref MENUITEMINFO lpmii);. One should always use IntPtr when passing a handle or pointer; and yes, www.pinvoke.net has some errors in that regard. Another potential problem may be the string in your structure; not sure that gets marshaled automatically. :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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[Nematjon Rahmanov]

Hi Luc. Thanks for your reply. I change my code like that :

[DllImport("user32.dll")]
public static extern bool InsertMenuItem(IntPtr hMenu, uint uItem, bool fByPosition,[In] ref MENUITEMINFO lpmii);

    \[DllImport("user32.dll")\]
    public static extern int SetMenuItemBitmaps(IntPtr hmenu, uint uposition, uint uFlags, IntPtr hBitmapUnchecked, IntPtr hBitmapChecked);

InsertMenuItem not yet working , but SetMenuItemBitmaps working well. Please help me . Thanks .

We are haven't bug,just temporarily undecided problems.

[Covean]

1. You have used the flag MIIM.SUBMENU (fMask) but you hasn't set the hSubMenu value. 2. You also should adjust your struct to use IntPtr instead of int. Like this:

\[StructLayout(LayoutKind.Sequential)\]
public struct MENUITEMINFO
{
    public uint cbSize;
    public uint fMask;
    public uint fType;
    public uint fState;
    public int wID;
    public IntPtr hSubMenu;
    public IntPtr hbmpChecked;
    public IntPtr hbmpUnchecked;
    public IntPtr dwItemData;
    public String dwTypeData;
    public uint cch;
    public IntPtr hbmpItem;
}

There may be also the problem with the (LPTSTR)String dwTypeData. If it doesn't work you could try StringBuilder instead.

Greetings Covean

[Nematjon Rahmanov]

Thanks Covean. You are right .Problem is fixed. Now i have shell menu working both 32 bit and 64 bit Windows version! Thank you very much!:rose:

We are haven't bug,just temporarily undecided problems.

[Covean]

You're welcome! :-D

Greetings Covean

[Decco]

Thanks, I had exactly the same problem ! Here my new code, if it can help someone esle :)

\[StructLayout(LayoutKind.Sequential)\]
public struct MENUITEMINFO
{
	public uint cbSize;
	public uint fMask;
	public uint fType;
	public uint fState;
	public uint wID;
	public IntPtr hSubMenu;
	public IntPtr hbmpChecked;
	public IntPtr hbmpUnchecked;
	public IntPtr dwItemData;
	public string dwTypeData;
	public uint cch;
	public IntPtr hbmpItem;
}

public class DllImports
{
\[DllImport("user32.dll")\]
    public static extern bool InsertMenuItem(IntPtr hMenu, uint uPosition, uint uFlags, \[In\] ref MENUITEMINFO mii);

    \[DllImport("user32")\]
    public static extern UInt32 SetMenuItemBitmaps(IntPtr hMenu, uint uPosition, uint uFlags, IntPtr hBitmapUnchecked, IntPtr hBitmapChecked);
}

    private void AddMenuItem(IntPtr hMenu, uint id, uint position, string text, Bitmap icon, IntPtr? hSubMenu)
    {
        MENUITEMINFO mii = new MENUITEMINFO();
        mii.cbSize = (uint)Marshal.SizeOf(typeof(MENUITEMINFO)); //48;
        mii.fMask = (uint)MIIM.ID | (uint)MIIM.STRING | (uint)MIIM.SUBMENU;
        mii.wID = id;
        mii.dwTypeData = text;

        if (hSubMenu.HasValue)
        {
            mii.hSubMenu = hSubMenu.Value;
        }

        DllImports.InsertMenuItem(hMenu, position, (uint)MF.BYPOSITION, ref mii);

        if (icon != null)
        {
            DllImports.SetMenuItemBitmaps(hMenu, id, (uint)MF.BYCOMMAND, icon.GetHbitmap(), icon.GetHbitmap());
        }
    }

The biggest problem was this line :

        mii.cbSize = (uint)Marshal.SizeOf(typeof(MENUITEMINFO)); //48;

As in all exemples you found on web, the size is set to 48 by default and not calculate. Thanks again. Decco