Re: Windows 10 Taskbar Behavior

Just taking a quick stab at it, I'd start changing addpm.c like so:

303a304,309
> 
> 	      wchar_t GNUEmacsAppIDstring[10];
> 	      const PROPERTYKEY DECLSPEC_SELECTANY PKEY_AppUserModel_ID =
>  	  	     { { 0x9F4C2855, 0x9F79, 0x4B39,
> 	  	     { 0xA8, 0xD0, 0xE1, 0xD4, 0x2D, 0xE1, 0xD5, 0xF3, } }, 5 };
> 
307a314,335
> 
> 	      // get the shortcut's propertystore interface
> 	      IPropertyStore *store;
> 	      result = IShellLinkA_QueryInterface (shortcut, &IID_IPropertyStore,
> 	                                           (void **) &store);
> 	      // todo: check result, handle errors
> 
> 	      // get the current app id, if any
> 	      PROPVARIANT pv;
> 	      result = store->GetValue(PKEY_AppUserModule_ID, &pv);
> 	      // todo: check result, handle errors
> 
> 	      // set it to "GNU.Emacs"
> 	      wcscpy(GNUEmacsAppIDstring, L"GNU.Emacs");
> 	      pv.vt = VT_LPWSTR;
> 	      pv.pwszVal = GNUEmacsAppIDstring;
> 	      result = store->SetValue(PKEY_AppUserModule_ID, pv);
> 	      // todo: check result, handle errors
> 	      // if successful,
> 	      IPropertyStore_Release(store); //? 
> 	      
> 	      // save the shortcut file
334a363,368
> 
> 	      wchar_t GNUEmacsAppIDstring[10];
> 	      const PROPERTYKEY DECLSPEC_SELECTANY PKEY_AppUserModel_ID =
>  	  	     { { 0x9F4C2855, 0x9F79, 0x4B39,
> 	  	     { 0xA8, 0xD0, 0xE1, 0xD4, 0x2D, 0xE1, 0xD5, 0xF3, } }, 5 };
> 	      
338a373,394
> 
> 	      // get the shortcut's propertystore interface
> 	      IPropertyStore *store;
> 	      result = IShellLinkA_QueryInterface (shortcut, &IID_IPropertyStore,
> 	                                           (void **) &store);
> 	      // todo: check result, handle errors
> 
> 	      // get the current app id, if any
> 	      PROPVARIANT pv;
> 	      result = store->GetValue(PKEY_AppUserModule_ID, &pv);
> 	      // todo: check result, handle errors
> 
> 	      // set it to "GNU.Emacs"
> 	      wcscpy(GNUEmacsAppIDstring, L"GNU.Emacs");
> 	      pv.vt = VT_LPWSTR;
> 	      pv.pwszVal = GNUEmacsAppIDstring;
> 	      result = store->SetValue(PKEY_AppUserModule_ID, pv);
> 	      // todo: check result, handle errors
> 	      // if successful,
> 	      IPropertyStore_Release(store); //? 
> 	      
> 	      // save the shortcut file


I don't have mingw setup to compile or test it yet.  And there's more to do (proper return value checking and error handling), and my C may be rusty, but that's the gist of it.


Rob


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Eli Zaretskii
Sent: Monday, October 19, 2015 11:07 AM
To: Juanma Barranquero <[email protected]>
Cc: [email protected]; [email protected]; [email protected]
Subject: Re: [h-e-w] Windows 10 Taskbar Behavior

> From: Juanma Barranquero <[email protected]>
> Date: Mon, 19 Oct 2015 16:24:35 +0200
> Cc: Rob Davenport <[email protected]>, 
> 	"[email protected]" <[email protected]>, Ben Key 
> <[email protected]>
> 
> On Mon, Oct 19, 2015 at 6:46 AM, Eli Zaretskii <[email protected]> wrote:
> >
> > > From: Rob Davenport <[email protected]>
> > > Date: Mon, 19 Oct 2015 00:10:34 +0000
> > >
> > > Addpm could be modified to add the app id when it creates the 
> > > shortcut, and eliminate step 2.
> >
> > Do you know how to do that from a C program? I didn't find a way, 
> > but I'm not an expert on that stuff.
> 
> The (BSD-licensed) code for Win7AppId is accessible from here:
> 
> https://code.google.com/p/win7appid/

Thanks.  This is C++, whereas I meant C.  The relevant COM interfaces are all defined in C++, so it's a small wonder it should be possible to do in C++.

It doesn't even compile with g++, at least not with mingw.org's headers.  Maybe MinGW64's g++ will succeed, I don't know.

I will try to convert this into C, if no one beats me to it, and see if it's possible.