[RESOLVED] Get active url in Google Chrome from v.29 with IAccessible

[FL4SHC0D3R]

Based in some examples of source codes as this => http://stackoverflow.com/questions/2...urrent-version, I'm trying get active url on address bar from Google Chrome with IAccessible, but it always return NULL (0). Could someone help me please?

Any suggestion will be welcome.

Here is my last attempt:

#include "stdafx.h"
#include <Windows.h>
#include <Oleacc.h>
#pragma comment( lib,"Oleacc.lib")

HWINEVENTHOOK LHook = 0;

void CALLBACK WinEventProc(HWINEVENTHOOK hWinEventHook, DWORD event, HWND hwnd, LONG idObject, LONG idChild, DWORD dwEventThread, DWORD dwmsEventTime) {

    IAccessible* pAcc = NULL;
    VARIANT varChild;
    HRESULT hr = AccessibleObjectFromEvent(hwnd, idObject, idChild, &pAcc, &varChild);

    if ((hr == S_OK) && (pAcc != NULL)) {
        BSTR bstrValue;
        pAcc->get_accValue(varChild, &bstrValue);

        char className[500];
        GetClassName(hwnd, (LPWSTR)className, 500);

        if (event == EVENT_OBJECT_VALUECHANGE){

            /*

           Window classe name of each browser =>

            Safari => SafariTaskbarTabWindow
            Chrome => Chrome_WidgetWin_1
            IE => IEFrame
            Firefox => MozillaWindowClass
            Opera => OperaWindowClass

            */

            if (strcmp(className, "Chrome_WidgetWin_1") != 0) {
                printf("Active URL: %ls\n", bstrValue);
            }
        }
        SysFreeString(bstrValue);
        pAcc->Release();
    }
}

void Hook() {

    if (LHook != 0) return;
    CoInitialize(NULL);
    LHook = SetWinEventHook(EVENT_OBJECT_FOCUS, EVENT_OBJECT_VALUECHANGE, 0, WinEventProc, 0, 0, WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);
}

void Unhook() {

    if (LHook == 0) return;
    UnhookWinEvent(LHook);
    CoUninitialize();
}


int main(int argc, const char* argv[]) {

    MSG msg;
    Hook();

    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    Unhook();

    return 0;
}

[Arjay]

I would use the Active Accessibility Tools that used to come with the Active Accessibility 2.0 SDK. Specifically use the AccExplorer32.exe tool to identify the aa elements - then you can compare with what your code does and what the tool discovers. Due to security considerations, this may not work within a hook.

At any rate, the AA 2.0 SDK doesn't seem to be available through Microsoft - you'll need to get it from the Win7 SDK: http://www.microsoft.com/en-us/downl...s.aspx?id=8279

[Igor Vartanov]

The approach works just fine, see the attached sample. However, there are lots of (null) lines produced when you refuse to filter by "Address and search bar".

J:\Temp\58>58.exe all
Catching all events...
Press any key to leave.
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
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URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: (null)
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URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: (null)
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URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
Leaving...

With the filtering you get a more concise output:

J:\Temp\58>58.exe

Press any key to leave.
URL change: (null)
URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
Leaving...

[FL4SHC0D3R]

The approach works just fine, see the attached sample. However, there are lots of (null) lines produced when you refuse to filter by "Address and search bar".

J:\Temp\58>58.exe all
Catching all events...
Press any key to leave.
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
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URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
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URL change: (null)
URL change: (null)
URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: (null)
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URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
Leaving...

With the filtering you get a more concise output:

J:\Temp\58>58.exe

Press any key to leave.
URL change: (null)
URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
URL change: (null)
URL change: (null)
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: forums.codeguru.com/forumdisplay.php?47-C-and-WinAPI
URL change: forums.codeguru.com/forumdisplay.php?7-Visual-C-Programming
Leaving...

Dear Igor,

Thank you very much for help me! I'm using VC++ 2013 and was necessary change kbhit() for _kbhit(), and then I compiled your code in attachment with success. But when execute, showed "Press any key to leave." and when pressed any key, the program finished. Then, how do fix?

[FL4SHC0D3R]

Here, this stretch:

printf("Catching all events...\n");
printAllEvents = TRUE;

never is executed . Why?

[VictorN]

Here, this stretch:

printf("Catching all events...\n");
printAllEvents = TRUE;

never is executed . Why?

Perhaps this condition

int _tmain(int argc, const TCHAR* argv[]) 
{

	if (argc > 1 && _tcsicmp(argv[1], TEXT("all")) == 0) 
	{
		printf("Catching all events...\n");
		printAllEvents = TRUE;
	}

is false?

[Igor Vartanov]

But when execute, showed "Press any key to leave." and when pressed any key, the program finished. Then, how do fix?

Well, the program is expected to work in background until you press any key, this is what "Press any key to leave" informs you about.

If you want to see any events from Chrome, you need to interact with your Chrome to invoke some. In my tests I just opened new tab and navigated to CG forum. This is what you can see in my logs.

[Igor Vartanov]

I'm trying get active url on address bar from Google Chrome with IAccessible

Maybe this is not what you think it is. The approach gives you an ability to subscribe to events from Chrome, but not to directly get the URL of already opened web page.

[FL4SHC0D3R]

Maybe this is not what you think it is. The approach gives you an ability to subscribe to events from Chrome, but not to directly get the URL of already opened web page.

Igor,

I already solved the problem . Thank you very much one more time for all your help