QueryService() with IID_ISimpleDOMNode failed with e10s

[Rajesh V R]

I am trying to find the URL from Mozilla window using VC++ project. For doing this, I used QueryService() API with parameter IID_ISimpleDOMNode". But the API fails on Windows 7 machines (both 32 bit and 64 bit) with Mozilla Version- 49.0.1. Sample code is given below:


// header files
#include "ISimpleDOMNode.h"
#include "ISimpleDOMText.h"
#include "ISimpleDOMDocument.h"

// GUIDs
const GUID refguid = {0x0c539790, 0x12e4, 0x11cf, 0xb6, 0x61, 0x00, 0xaa, 0x00, 0x4c, 0xd6, 0xd8};
const IID IID_ISimpleDOMNode= {0x1814ceeb,0x49e2,0x407f,0xaf,0x99,0xfa,0x75,0x5a,0x7d,0x26,0x07};
const IID IID_ISimpleDOMText= {0x4e747be5,0x2052,0x4265,0x8a,0xf0,0x8e,0xca,0xd7,0xaa,0xd1,0xc0};
const IID IID_ISimpleDOMDocument= {0x0D68D6D0,0xD93D,0x4d08,0xA3,0x0D,0xF0,0x0D,0xD1,0xF4,0x5B,0x24};

Void FindURLfromWindow(HWND hwnd)
{
try
{
if(hwnd)
{
IAccessible *pAccBrowser = NULL;
HRESULT hr = AccessibleObjectFromWindow(hwnd, OBJID_CLIENT, IID_IAccessible, (void**)&pAccBrowser);
if(SUCCEEDED(hr) && (pAccBrowser))
{
VARIANT vtStart;
VARIANT vtResult;
vtStart.vt = VT_I4;
vtStart.lVal = CHILDID_SELF;
/////////////////////////////
hr = pAccBrowser->accNavigate(NAVRELATION_EMBEDS,vtStart,&vtResult);
if(SUCCEEDED(hr))
{
IDispatch *pDisp = vtResult.pdispVal;
IAccessible *pAccDoc = NULL;
hr = pDisp->QueryInterface(IID_IAccessible,(void **)&pAccDoc);
if(SUCCEEDED(hr) && (pAccDoc))
{
hr = pAccDoc->QueryInterface(IID_IServiceProvider, (void **)&pServProv);
if(SUCCEEDED(hr) && (pServProv))
{
ISimpleDOMNode *pNode = NULL;
hr = pServProv->QueryService(refguid, IID_ISimpleDOMNode,(void **)&pNode); //failed in Windows 7
if(SUCCEEDED(hr) && (pNode))
{
ISimpleDOMDocument *pDoc = NULL;
hr = pNode->QueryInterface(IID_ISimpleDOMDocument, (void **)&pDoc);
if(SUCCEEDED(hr) && (pDoc))
{
BSTR bstrUrl = NULL;
hr = pDoc->get_URL(&bstrUrl);
if(SUCCEEDED(hr) && (bstrUrl))
{
//success
}
}
}
}
}
}
}
}
}
catch(...)
{
}
}
//

Kindly help me to solve this issue.

[Marco Zehe]

Hello Rajesh,

1. Firefox 49 is outdated.

2. No official version supports accessibility with E10S on in Windows yet. If you need to use accessibility services of any kind, please only use it with E10S off. This is a known problem and won't be fixed in older versions of Firefox.

Marco


Von meinem iPad gesendet

> _______________________________________________
> dev-accessibility mailing list
> dev-acce...@lists.mozilla.org
> https://lists.mozilla.org/listinfo/dev-accessibility

[Rajesh V R]

Hi Marco,

Thanks for your reply.

1. May I know when e10s completely supports Windows? We are facing this issue only on Windows 7 machines. We tried with latest version of Firefox (51.0.1).

2. May I know why it is working with Windows 8 and Windows 10?

Thanks,
Rajesh

[Alexander Surkov]

Cc'ing more folks.

Aaron, do you have ideas why else [1] QueryService(IID_ISimpleDOMNode) may
fail? AT vendor complained about same issue too. It seems like the issue is
not restricted to any particular machine.

Please feel free to move the discussion back to the bug.

Thanks!
Alex.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1310166#c29

[Aaron Klotz]

Moving discussion to bug...

On 2/23/2017 5:27 AM, Alexander Surkov wrote:
> Cc'ing more folks.
>
> Aaron, do you have ideas why else [1] QueryService(IID_ISimpleDOMNode)
> may fail? AT vendor complained about same issue too. It seems like the
> issue is not restricted to any particular machine.
>
> Please feel free to move the discussion back to the bug.
>
> Thanks!
> Alex.
>
> [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1310166#c29
>
> On Thu, Feb 23, 2017 at 6:23 AM, Rajesh V R <rajes...@gmail.com

> <mailto:rajes...@gmail.com>> wrote:
>
> Hi Marco,
>
> Thanks for your reply.
>
> 1. May I know when e10s completely supports Windows? We are facing
> this issue only on Windows 7 machines. We tried with latest
> version of Firefox (51.0.1).
>
> 2. May I know why it is working with Windows 8 and Windows 10?
>
> Thanks,
> Rajesh
>
> On Wednesday, February 22, 2017 at 6:56:40 PM UTC+5:30, Marco Zehe
> wrote:
> > Hello Rajesh,
> >
> > 1. Firefox 49 is outdated.
> >
> > 2. No official version supports accessibility with E10S on in
> Windows yet. If you need to use accessibility services of any
> kind, please only use it with E10S off. This is a known problem
> and won't be fixed in older versions of Firefox.
> >
> > Marco
> >
> >
> > Von meinem iPad gesendet
> >
> > > Am 22.02.2017 um 07:42 schrieb Rajesh V R

> <rajes...@gmail.com <mailto:rajes...@gmail.com>>:

> <mailto:dev-acce...@lists.mozilla.org>
> > > https://lists.mozilla.org/listinfo/dev-accessibility
> <https://lists.mozilla.org/listinfo/dev-accessibility>

>
> _______________________________________________
> dev-accessibility mailing list
> dev-acce...@lists.mozilla.org

> <mailto:dev-acce...@lists.mozilla.org>
> https://lists.mozilla.org/listinfo/dev-accessibility
> <https://lists.mozilla.org/listinfo/dev-accessibility>
>
>