Loop through IContextMenu

Question

How do I loop through all items and sub items of a IContextMenu and list all available verbs? So far, I have this working code extracted from JCL:

function D         


        

Answer 1

To enumerate the items of the context menu you can use the Windows Menu functions : GetMenuItemCount , GetMenuItemInfo, GetSubMenu.

using these functions i wrote this function

uses
JclShell,
ShlObj;

function DisplayContextMenuInfo( const Folder: IShellFolder; Item: PItemIdList; List :TStrings): Boolean;

  function GetMenuItemCaption(const hSubMenu: HMENU; const MenuId: Integer): string;
  var
    MenuItemInfo: TMenuItemInfo;
  begin
    MenuItemInfo.cbSize := SizeOf(MenuItemInfo);
    MenuItemInfo.fMask := MIIM_STRING;
    SetLength(Result, 1024*Sizeof(Char));
    MenuItemInfo.dwTypeData := PChar(Result);
    MenuItemInfo.cch        := Length(Result)-1;
    if not GetMenuItemInfo(hSubMenu, MenuId, False, MenuItemInfo) then
      RaiseLastOSError;
    SetLength(Result, MenuItemInfo.cch*Sizeof(Char));
  end;

  Procedure LogGetMenuInfo(Menu: HMENU);
  var
    i             : Integer;
    ItemsCount    : Integer;
    MenuId        : Cardinal;
    Caption       : string;
  begin
     ItemsCount:=GetMenuItemCount(Menu);

     List.Add(Format('Number of items %d ',[ItemsCount]));
      for i:= 0 to ItemsCount - 1 do
      begin
        MenuId:=GetMenuItemID(Menu,i);

        case MenuId of

         Cardinal(-1) : begin
                          List.Add('');
                          List.Add(Format('Sub Menu',[]));
                          LogGetMenuInfo(GetSubMenu(Menu,i));
                        end;
         0            :

         else
                        begin
                          Caption:=GetMenuItemCaption(Menu, MenuId);
                          List.Add(Format('MenuId (Cmd) %d Caption %s  ',[MenuId,Caption]))
                        end;

        end;
      end;

  end;


var
  ContextMenu: IContextMenu;
  Menu: HMENU;

begin
  Result := False;
  if (Item = nil) or (Folder = nil) then  Exit;
  Folder.GetUIObjectOf(0, 1, Item, IID_IContextMenu, nil,  Pointer(ContextMenu));
  if ContextMenu <> nil then
  begin
    Menu := CreatePopupMenu;
    try
      if Menu <> 0 then
        if Succeeded(ContextMenu.QueryContextMenu(Menu, 0, 1, $7FFF, CMF_EXPLORE)) then
           LogGetMenuInfo(Menu);
    finally
      DestroyMenu(Menu);
    end;
  end;
end;

and call in this way

var
  ItemIdList: PItemIdList;
  Folder    : IShellFolder;
  FileName  : string;
begin
  FileName:= 'C:\Users\Dexter\Downloads\VirtualTreeview.pdf';
  ItemIdList := PathToPidlBind(FileName, Folder);
  if ItemIdList <> nil then
  begin
    DisplayContextMenuInfo( Folder, ItemIdList, Memo1.lines);
    PidlFree(ItemIdList);
  end;
end;

this will fill the TStrings passed as parameter with info like this :

Number of items 26 
MenuId (Cmd) 141 Caption Open with Adobe Reader X
MenuId (Cmd) 142 Caption &Open
MenuId (Cmd) 143 Caption &Print
MenuId (Cmd) 146 Caption Run &Sandboxed
MenuId (Cmd) 140 Caption Analizar con &AVG
Sub Menu
Number of items 28 
MenuId (Cmd) 105 Caption Add To Send To
MenuId (Cmd) 106 Caption Add To Templates
MenuId (Cmd) 107 Caption Change Date && Time
MenuId (Cmd) 108 Caption Change Extension: pdf
MenuId (Cmd) 109 Caption Choose Program
MenuId (Cmd) 110 Caption Command Prompt
MenuId (Cmd) 111 Caption Copy/Move To Folder
MenuId (Cmd) 112 Caption Copy Path
MenuId (Cmd) 113 Caption Delete On Reboot
MenuId (Cmd) 114 Caption Duplicate File
MenuId (Cmd) 115 Caption Encrypt File
MenuId (Cmd) 116 Caption Explore Rooted
MenuId (Cmd) 117 Caption Extended Delete
MenuId (Cmd) 118 Caption Extended Search && Replace     

now using this function you can pass the menuid (cmd) which you want execute

function InvokeContextMenuCommand(const Comnand: Cardinal; const Folder: IShellFolder; Item: PItemIdList): Boolean;
var
  ContextMenu   : IContextMenu;
  CommandInfo   : TCMInvokeCommandInfo;
  Menu          : HMENU;
  CallbackWindow: THandle;
begin
  Result := False;
  if Comnand=0 then exit;

  if (Item = nil) or (Folder = nil) then  Exit;
    Folder.GetUIObjectOf(0, 1, Item, IID_IContextMenu, nil,  Pointer(ContextMenu));
  if ContextMenu <> nil then
   begin
    Menu := CreatePopupMenu;
    try
      if Menu <> 0 then
      if Succeeded(ContextMenu.QueryContextMenu(Menu, 0, 1, $7FFF, CMF_EXPLORE)) then
      begin
        CallbackWindow:=0;
        TrackPopupMenu(Menu, TPM_LEFTALIGN or TPM_LEFTBUTTON or  TPM_RIGHTBUTTON or TPM_RETURNCMD, 0, 0, 0, CallbackWindow, nil);
        ZeroMemory(@CommandInfo, SizeOf(CommandInfo));
        CommandInfo.cbSize := SizeOf(TCMInvokeCommandInfo);
        CommandInfo.hwnd   := 0;
        CommandInfo.lpVerb := MakeIntResourceA(Comnand - 1);
        CommandInfo.nShow  := SW_SHOWNORMAL;
        Result := Succeeded(ContextMenu.InvokeCommand(CommandInfo));
      end;
    finally
     DestroyMenu(Menu);
    end;
   end;
end;

call in this way

var
  ItemIdList: PItemIdList;
  Folder    : IShellFolder;
  FileName  : string;
begin
  FileName:= 'C:\Users\Dexter\Downloads\VirtualTreeview.pdf';
  ItemIdList := PathToPidlBind(FileName, Folder);
  if ItemIdList <> nil then
  begin
    //calling the 141 Menuid = `Open with Adobe Reader X`
    InvokeContextMenuCommand(141,Folder, ItemIdList);
    PidlFree(ItemIdList);
  end;
end;