Re: [h-e-w] Windows 10 Taskbar Behavior

[Rob Davenport]

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

> From: Juanma Barranquero <address@hidden>
> Date: Mon, 19 Oct 2015 16:24:35 +0200
> Cc: Rob Davenport <address@hidden>, 
>       "address@hidden" <address@hidden>, Ben Key 
> <address@hidden>
> 
> On Mon, Oct 19, 2015 at 6:46 AM, Eli Zaretskii <address@hidden> wrote:
> >
> > > From: Rob Davenport <address@hidden>
> > > 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.