IContextMenu InvokeCommand

[Lars Nielsen]

I have made a shell extension dll in c# to add a menuitem to the explorer context menu

I have implemented these method
IShellExtInit.I nitializ
IContextMenu.Qu eryContextMen
IContextMenu.Ge tCommandStrin
IContextMenu.In vokeComman

When I register the dll with regasm and gacutil a menuitem shows in the explorer contextmenu and
IShellExtInit.I nitialize and IContextMenu.Qu eryContextMenu gets called. But GetCommandStrin g and
InvokeCommand never gets called when I click the menu item

Can anyone explain whats going on

Thank
Lars

[Mattias Sjögren]

Lars,

Can anyone explain whats going on?

It's hard to guess without seeing any code.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Lars Nielsen]

a dll file consisting of the two files shellext.cs and ContextMenuHand ler.c
shellext.c

using System
using System.Runtime. InteropServices

namespace ShellEx

// IUnknow
[ComImport(), GuidAttribute(" 00000000-0000-0000-c000-000000000046")
InterfaceType(C omInterfaceType .InterfaceIsIUn known)
public interface IUnknow

// IClassFactor
[ComImport(), GuidAttribute(" 00000001-0000-0000-c000-000000000046")
InterfaceType(C omInterfaceType .InterfaceIsIUn known)
public interface IClassFactor

// IShellExtIni
[ComImport(), GuidAttribute(" 000214e8-0000-0000-c000-000000000046")
InterfaceType(C omInterfaceType .InterfaceIsIUn known)
public interface IShellExtIni

[PreserveSig()
int Initialize (IntPtr pidlFolder, IntPtr lpdobj, uint /*HKEY*/ hKeyProgID)
// IContextMen
[ComImport(), GuidAttribute(" 000214e4-0000-0000-c000-000000000046")
InterfaceType(C omInterfaceType .InterfaceIsIUn known)
public interface IContextMen

// IContextMenu method
[PreserveSig()
int QueryContextMen u(uint hmenu, uint iMenu, int idCmdFirst, int idCmdLast, uint uFlags)
[PreserveSig()
void InvokeCommand (IntPtr pici)
[PreserveSig()
void GetCommandStrin g(int idcmd, uint uflags, int reserved, string commandstring, int cch)

ContextMenuHand ler.c

using System
using System.Runtime. InteropServices
using Microsoft.Win32

using ShellExt

namespace ContextMenuHand le

[Guid("xxxxxxxx-xxxx-xxxx-xxxx-4F33EC089772"), ComVisible(true )
public class MyExtension : IShellExtInit, IContextMen

// *** Imports *************** *************** *************** *******

// MessageBo
[DllImport("user 32")
static extern int MessageBox(int hWnd, string text, string caption, int type)

[DllImport("user 32")
static extern bool InsertMenu( uint hMenu
uint uPosition
uint uFlags
int uIDNewItem
string lpNewIte
)

// *** Consts *************** *************** *************** ********

const string guid = @"{xxxxxxxx-xxxx-xxxx-xxxx-4F33EC089772}"
const string regHome1 = @"my_file\shell ex\ContextMenuH andlers"
const string regApproved = @"Software\Micr osoft\Windows\C urrentVersion\S hell Extensions\Appr oved"
const int I_OK = 0
const int I_FALSE = 1

// *** Functions *************** *************** *************** *****

// Initializ
int IShellExtInit.I nitialize (IntPtr /*LPCITEMIDLIST*/ pidlFolder, IntPtr /*LPDATAOBJECT*/ lpdobj, uint /*HKEY*/ hKeyProgID

MessageBox(0, "IShellExtInit. Initialize", "Informatio n", 0)
return I_OK
// QueryContextMen
int IContextMenu.Qu eryContextMenu( uint hMenu, uint iMenu, int idCmdFirst, int idCmdLast, uint uFlags

MessageBox(0, "IContextMenu.Q ueryContextMenu ", "Informatio n", 0)
// MessageBox(0, hMenu.ToString( )+" "+ iMenu.ToString( )+" "+ idCmdFirst.ToSt ring()+" "+ idCmdLast.ToStr ing()+" "+ uFlags.ToString (), "Informatio n", 0)
bool bResult = InsertMenu(hMen u, 0, 0, 1024, "Do &Stuff...")
// MessageBox(0, "Result = "+bResult.ToStr ing(), "Informatio n", 0)
return 1
// GetCommandStrin
void IContextMenu.Ge tCommandString( int idCmd, uint uFlags, int pwReserved, string commandString, int cchMax

MessageBox(0, "IContextMenu.G etCommandString ", "Informatio n", 0)
return
// InvokeComman
void IContextMenu.In vokeCommand(Int Ptr pici

MessageBox(0, "IContextMenu.I nvokeCommand", "Informatio n", 0)
return
// *** COM Register/Unregister functions *************** ***********

[ComRegisterFunc tion
public static void Register(System .Type t)

tr

RegistryKey regRoot = Registry.Classe sRoot
RegistryKey regKey

regRoot.CreateS ubKey(regHome1)

regKey = regRoot.CreateS ubKey(regHome1 + @"\MyCommandISE ")
regKey.SetValue (string.Empty, guid)

// Add to list of approved shellextension
regRoot = Registry.LocalM achine

regKey = regRoot.OpenSub Key(regApproved , true)
regKey.SetValue (guid, "ContextMen u Extension")

// CloseKey
regKey.Close()
regRoot.Close() ;
}
catch(Exception ex)
{
MessageBox(0, ex.Message, "Exception Occured", 0);
}
}

[ComUnregisterFu nction]
public static void UnRegister(Syst em.Type t)
{
try
{
RegistryKey regRoot = Registry.Classe sRoot;
RegistryKey regKey;

regRoot.DeleteS ubKeyTree(@"my_ file\shellex");

// Remove from list of approved shellextensions
regRoot = Registry.LocalM achine;

regKey = regRoot.OpenSub Key(regApproved , true);
regKey.DeleteVa lue(guid);

regKey.Close();
regRoot.Close() ;
}
catch(Exception ex)
{
MessageBox(0, ex.Message, "Exception Occured", 0);
}
}
} // ContextMenuExte nsion
} // Namespace

[Mattias Sjögren]

Lars,

bool bResult = InsertMenu(hMen u, 0, 0, 1024, "Do &Stuff...");
Where did you get 1024 from? I believe you're supposed to use
idCmdFirst there rather than picking your own arbitrary command ID.

void IContextMenu.Ge tCommandString( int idCmd, uint uFlags, int pwReserved, string commandString, int cchMax)

I'd make commandString an IntPtr or possibly a StringBuilder.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Lars Nielsen]

found the problem! ;
int IContextMenu.Qu eryContextMenu( uint hMenu, uint iMenu, int idCmdFirst, int idCmdLast, uint uFlags

int idCmd = idCmdFirst
bool bResult = InsertMenu(hMen u, iMenu++, 1024, idCmd++, "Do &Stuff...")
return 1
1024 is the value of MF_BYPOSITIO