/// <summary>
/// Add commands to a shortcut menu.
/// </summary>
/// <param name="hMenu">A handle to the shortcut menu.</param>
/// <param name="iMenu">
/// The zero-based position at which to insert the first new menu item.
/// </param>
/// <param name="idCmdFirst">
/// The minimum value that the handler can specify for a menu item ID.
/// </param>
/// <param name="idCmdLast">
/// The maximum value that the handler can specify for a menu item ID.
/// </param>
/// <param name="uFlags">
/// Optional flags that specify how the shortcut menu can be changed.
/// </param>
/// <returns>
/// If successful, returns an HRESULT value that has its severity value set
/// to SEVERITY_SUCCESS and its code value set to the offset of the largest
/// command identifier that was assigned, plus one.
/// </returns>
public int QueryContextMenu(
IntPtr hMenu,
uint iMenu,
uint idCmdFirst,
uint idCmdLast,
uint uFlags)
{
// If uFlags include CMF_DEFAULTONLY then we should not do anything.
if (((uint)CMF.CMF_DEFAULTONLY & uFlags) != 0)
{
return WinError.MAKE_HRESULT(WinError.SEVERITY_SUCCESS, 0, 0);
}
uint uID = idCmdFirst;
IntPtr hSubmenu = NativeMethods.CreatePopupMenu();
// Use InsertMenuItem to add main menu items.
MENUITEMINFO mii = new MENUITEMINFO();
mii.cbSize = (uint)Marshal.SizeOf(mii);
mii.fMask = MIIM.MIIM_BITMAP | MIIM.MIIM_SUBMENU | MIIM.MIIM_FTYPE | MIIM.MIIM_ID
| MIIM.MIIM_STATE | MIIM.MIIM_STRING;
mii.wID = idCmdFirst + IDM_DISPLAY;
mii.fType = MFT.MFT_STRING;
mii.dwTypeData = this._menuText;
mii.fState = MFS.MFS_ENABLED;
mii.hbmpItem = this._menuBmp;
mii.hSubMenu = hSubmenu;
if (!NativeMethods.InsertMenuItem(hMenu, iMenu, true, ref mii))
{
return Marshal.GetHRForLastWin32Error();
}
// Get all loaded printers.
_printerList = LoadAllPrinters();
for (int i = 0; i < _printerList.Count; ++i)
{
// Use InsertMenu to add submenu items.
if (!NativeMethods.InsertMenu(
hSubmenu, (uint)i,
0x00000400, uID++,
_printerList[i]["Location"]))
{
return Marshal.GetHRForLastWin32Error();
}
}
// Return an HRESULT value with the severity set to SEVERITY_SUCCESS.
// Set the code value to the offset of the largest command identifier
// that was not assigned
return WinError.MAKE_HRESULT(WinError.SEVERITY_SUCCESS, 0,
uID - idCmdFirst);
}
public static extern bool InsertMenuItem(
IntPtr hMenu,
uint uItem,
[MarshalAs(UnmanagedType.Bool)] bool fByPosition,
ref MENUITEMINFO mii);
