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一种清除windows通知区域“僵尸”图标的方案——XP系统解决方案

 
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XP下“僵尸”图标的解决方案

《一种清除windows通知区域“僵尸”图标的方案——问题分析》(以后简称《问题分析》)一文中分析的通知区域结构可以看出,XP的通知区域结构是相对简单的。如果我们解决了XP下的问题,那么Win7上的问题至少解决了一半——只有那个隐藏系统通知区域需要研究下。所以,我们先选择XP作为研究对象。(转载请指明出于breaksoftware的csdn博客)

从SPY++抓到的结构可以看出来,通知区域是一个ToolbarWindow32窗口类对象。ToolbarWindow32是windows一个标准的窗口类,虽然我们不能直接调用该类的一些方法来操作元素,但是该类对象响应Toolbar的标准消息。这也是我最开始的解决思路。

获取图标信息

在尝试去掉“僵尸”图标之前,有几个问题摆在我们面前

  1. 如何获取图标的总数
  2. 如何枚举到每个图标
  3. 如何获取图标的信息
  4. 如何找到我们创建的图标

查阅MSDN后,我发现Toolbar消息中TB_BUTTONCOUNT可以获取到通知区域图标总数。如此,我们便可以一个For循环枚举到所有图标。问题1和2便迎刃而解。那如何找到我们创建的图标呢?在《问题分析》一文中,我们在介绍初始化图标时,特别提出,我给图标Tip取了一个晦涩的名字——“中A英1文”。如此设计,也是因为我试图通过这个特征来识别图标(虽然这种方案存在不严谨性,但是图标的识别不是本文的主要的探讨课题)。

那么我们如何去获取图标的文字呢?查阅MSDN,发现TB_GETBUTTONTEXT这个消息可以获取图标的文字。其参数说明是

wParam
Command identifier of the button whose text is to be retrieved.
lParam
Pointer to a buffer that receives the button text.
这儿要注意几个问题:
  1. 什么是Command identfier?它和我们For循环传递的递增参数是一致的么?
  2. lParam指向的地址到底在哪个进程中?因为通知区域的进程载体是Explorer,而Explorer自然不可以访问到我们进程中的空间。如果这段空间在Explorer进程中,我们进程又如何才能读取到Explorer进程中的空间呢?
第一个问题,我查阅了MSDN,没有说明Command identifier具体的含义。只说了该字段被用在图标被选中而产生的WM_COMMAND消息结构体中。后来查阅了一下MSDN,关于传递的参数分为两种:
1 Command identifier of the button whose text is to be retrieved.
2 Zero-based index of the button for which to retrieve information.
可以见得两者是不可以混用的。这两者存在一个推导关系,即可以通过2推导出1。实现这个过程的是TB_GETBUTTON消息。
wParam
Zero-based index of the button for which to retrieve information.
lParam
Pointer to the TBBUTTON structure that receives the button information.
lParam指向一个获取的结构体TBBUTTON信息
typedef struct {
  int       iBitmap;
  int       idCommand;
  BYTE      fsState;
  BYTE      fsStyle;
#ifdef _WIN64
  BYTE      bReserved[6];
#else 
#if defined(_WIN32)
  BYTE      bReserved[2];
#endif 
#endif 
  DWORD_PTR dwData;
  INT_PTR   iString;
} TBBUTTON, *PTBBUTTON, *LPTBBUTTON;
其中idCommand就是我们之前提到的Command identifier。
问题1我们解决了,那么问题2呢?我们不仅在发送TB_GETBUTTONTEXT消息时遇到这个问题,在发送TB_GETBUTTON消息时也会遇到。这个问题说到底就是跨进程的数据通信,那使用内存映射?No!管道?No!Socket?No!……
我们采用《VC下提前注入进程的一些方法2——远线程带参数》一文中的方法——在其他进程空间中申请可读写内存。具体的代码如下。
#define SENDMSGTIME 100

CSendMessageToProcess::CSendMessageToProcess(void)
{
}

CSendMessageToProcess::CSendMessageToProcess( HWND hwnd, ENUMWINOWSENDPROC lpFunc )
{
    m_hWnd = hwnd;
    m_lpFun = lpFunc;
    
    m_stRemoteBuffer.lpBuffer = NULL;
    m_stRemoteBuffer.dwBufferSize = BUFFERSIZE;
    m_hProcess = NULL;
    InitializeRemoteBuffer();
}


CSendMessageToProcess::~CSendMessageToProcess(void)
{
    UnitializeRemoteBuffer();
}


BOOL CSendMessageToProcess::InitializeRemoteBuffer()
{
    if ( NULL != m_stRemoteBuffer.lpBuffer ) {
        return TRUE;
    }

    BOOL bSuc = FALSE;
    do {
        if ( 0 == m_stRemoteBuffer.dwBufferSize ) {
            ::SetLastError(ERROR_INVALID_PARAMETER);
            break;
        }

        DWORD dwProcessID = 0;
        GetWindowThreadProcessId(m_hWnd, &dwProcessID);

        m_hProcess = OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_READ|PROCESS_VM_WRITE , FALSE, dwProcessID);

        if ( NULL == m_hProcess ) {
            break;;
        }

        m_stRemoteBuffer.lpBuffer = (LPBYTE)VirtualAllocEx(m_hProcess, NULL, 
            m_stRemoteBuffer.dwBufferSize,  MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);

        if ( NULL == m_stRemoteBuffer.lpBuffer ) {
            break;
        }
        bSuc = TRUE;
    }while (0);
    return bSuc;
}

VOID CSendMessageToProcess::UnitializeRemoteBuffer()
{
    if ( NULL != m_hProcess ) {
        VirtualFreeEx(m_hProcess, m_stRemoteBuffer.lpBuffer, 0, MEM_RELEASE);
        m_stRemoteBuffer.lpBuffer = NULL;
        m_stRemoteBuffer.dwBufferSize = 0;
        CloseHandle(m_hProcess);
        m_hProcess = NULL;
    }
}

BOOL CSendMessageToProcess::SendRemoteMessage( DWORD dwMsgID, DWORD dwIndexOrCmdId, PStBufferInfo lpstLocalBuffer, DWORD& dwRet )
{
    BOOL bSuc = FALSE;
    do {
        if ( NULL == lpstLocalBuffer ) {
            if ( 0 == ::SendMessageTimeout( m_hWnd, dwMsgID, dwIndexOrCmdId, 0, SMTO_ABORTIFHUNG, SENDMSGTIME, &dwRet ) ) {
                break;
            }
            bSuc = TRUE;
            break;
        }
        if ( NULL == lpstLocalBuffer || NULL == m_stRemoteBuffer.lpBuffer ) {
            ::SetLastError(ERROR_INVALID_PARAMETER);
            break;
        }

        if ( NULL == m_stRemoteBuffer.lpBuffer || 0 == m_stRemoteBuffer.dwBufferSize ) {
            ::SetLastError(ERROR_INVALID_PARAMETER);
            break;
        }

        if ( lpstLocalBuffer->dwBufferSize > m_stRemoteBuffer.dwBufferSize ) {
            ::SetLastError(ERROR_MORE_DATA);
            break;
        }

        DWORD dwWrite = 0;
        if ( NULL != lpstLocalBuffer->lpBuffer && 0 != lpstLocalBuffer->dwBufferSize ) {
            // 使用传入的数据初始化数据空间
            if ( FALSE == WriteProcessMemory(m_hProcess, m_stRemoteBuffer.lpBuffer, 
                lpstLocalBuffer->lpBuffer,  lpstLocalBuffer->dwBufferSize , &dwWrite) ) 
            {
                break;
            }
        }

        if ( 0 == ::SendMessageTimeout( m_hWnd, dwMsgID, dwIndexOrCmdId, 
            (LPARAM)m_stRemoteBuffer.lpBuffer, SMTO_ABORTIFHUNG, SENDMSGTIME, &dwRet ) ) 
        {
            break;
        }

        DWORD dwRead = 0;
        if ( NULL != lpstLocalBuffer->lpBuffer && 0 != lpstLocalBuffer->dwBufferSize ) {
            if ( FALSE == ReadProcessMemory( m_hProcess, m_stRemoteBuffer.lpBuffer, 
                lpstLocalBuffer->lpBuffer, lpstLocalBuffer->dwBufferSize, &dwRead))  
            {
                break;
            }
        }
        bSuc = TRUE;
    } while (0);
    return bSuc;
}
这儿有个特别需要说明的:我使用的是SendMessageTimeout发送消息,而不是SendMessage。因为我们对其他进程发送消息时,我们无法保证其他进程在处理消息时是否会非常费时,或者压根就不返回,从而导致我们发起消息的线程被堵塞。一般来说,比较好的方式是采用PostMessage向其他进程发送消息。但是由于我们的流程需要同步执行,所以在保证同步的情况下,同时兼顾SendMessage执行超时,采用了SendMessageTimeout方式。
打通一切问题后,我们把枚举方法也给出
BOOL CSendMessageToProcess::EnumChild()
{
    BOOL bSuc = FALSE;
    do {
        DWORD dwChildCount = 0;
        if ( 0 == ::SendMessageTimeout(m_hWnd, TB_BUTTONCOUNT, 0, 0, SMTO_ABORTIFHUNG, SENDMSGTIME, &dwChildCount) ) {
            break;
        }
        BOOL bContinue = TRUE;
        for ( DWORD dwIndex = 0; dwIndex < dwChildCount && bContinue; dwIndex++ ) {
           bContinue = m_lpFun(this, dwIndex);
        }

        bSuc = TRUE;
    } while (0);
    return bSuc;
}
这儿m_lpFun是一个回调函数,其用来判定和执行清除“僵尸”图标的目的。其回调函数是
static BOOL CALLBACK DealChildComp(CSendMessageToProcess* lpThis, DWORD dwIndex)
{
    BOOL bContinue = TRUE;
    do  {
        BYTE byLocalBuffer[BUFFERSIZE] = {0};
        WCHAR wchBuffer[BUFFERSIZE] = {0};
        memset(byLocalBuffer, 0, sizeof(byLocalBuffer));

        TBBUTTON TBButton;
        memset(&TBButton, 0, sizeof(TBButton));
        StBufferInfo stLocalBuffer;
        stLocalBuffer.lpBuffer = &TBButton;
        stLocalBuffer.dwBufferSize = sizeof(TBBUTTON);

        DWORD dwSucGetButton = 0;
        if ( FALSE == lpThis->SendRemoteMessage(TB_GETBUTTON, dwIndex, &stLocalBuffer, dwSucGetButton ) ) {
            continue;
        }

        memset(byLocalBuffer, 0, sizeof(byLocalBuffer));
        stLocalBuffer.lpBuffer = byLocalBuffer;
        stLocalBuffer.dwBufferSize = sizeof(byLocalBuffer);
        DWORD dwRetLenth = 0xFFFFFFFF;
        if ( FALSE == lpThis->SendRemoteMessage(TB_GETBUTTONTEXTW, TBButton.idCommand, &stLocalBuffer, dwRetLenth ) ) {
            continue;
        }

        if ( 0xFFFFFFFF == dwRetLenth  ) {
            continue;
        }

        memset(wchBuffer, 0, sizeof(wchBuffer));
        memcpy_s( wchBuffer, sizeof(wchBuffer), byLocalBuffer, dwRetLenth * sizeof(WCHAR));
        std::cout<<wchBuffer<<std::endl;
        if ( 0 != lstrcmp( L"中A英1文", wchBuffer)) {
            continue;
        }

        g_bFind = TRUE;
        //bContinue = lpThis->ClearIcon(TBButton.idCommand, FALSE);
        bContinue = lpThis->ClearIcon(dwIndex, TRUE);
    } while (0);
    return bContinue;
}
下一步,我们将要将重心放在如何清除“僵尸”图标上。注意一下ClearIcon这个函数,从我上面列出的代码可以看出,貌似是存在两种方法。是的,的确是两种。之后我将详细介绍这两种方法。

直接删除“僵尸”图标

MSDN上给出了Toolbar消息的所有名称,其中最开始吸引我的是TB_DELETEBUTTON这个消息。在经过上面一系列努力后,我们只要发送这个消息给通知区域便可以干净利索优雅的清除“僵尸”图标。其参数说明是

wParam
Zero-based index of the button to delete.
lParam
Must be zero.
我们的代码是

BOOL CSendMessageToProcess::ClearIcon(DWORD dwIndexOrCmdID, BOOL bByDelete/* = FALSE*/)
{
    BOOL bContinue = FALSE;

    do {
        if ( bByDelete ) {
            DWORD dwNULL = 0;
            SendRemoteMessage(TB_DELETEBUTTON, dwIndexOrCmdID, NULL, dwNULL);
            bContinue = TRUE;
            break;
        }
这样看似没什么问题了,但是我们看下执行的结果


看下红色框住的区域(非水印内容),“僵尸”图标的确是被删除了,但是任务栏的长度却没有变化!这是这种最优雅的方法的最失败的地方,也正是这个缺陷促使我再次寻找能彻底解决的方法。但是其实这个技术缺陷可以通过产品设计的方法来规避:我们进程启动时,清除“僵尸”图标,然后创建一个可用的图标。这样会促使通知区域重新计算区域大小,从而触发一次自动调整。

模拟鼠标方式去除“僵尸”图标

模拟鼠标方式是最符合“常规”的一种方法。因为正常情况下,鼠标划过“僵尸”图标会导致通知区域删除之。那么我们在程序中模拟鼠标滑动,不也是可以解决这个问题么?现在的问题就集中在以下问题上
  1. 如何计算出“僵尸”图标的位置
  2. 发送哪些消息
第一个问题我们可以通过发送TB_GETRECT消息来获得,其参数说明是
wParam
Command identifier of the button.
lParam
Pointer to a RECT structure that will receive the bounding rectangle information.
第二个问题我们可以在计算好滑动区域的情况下,发送WM_MOUSEMOVE,对应的代码是
  else {
            RECT rc;
            StBufferInfo stLocalBuffer;
            stLocalBuffer.lpBuffer = &rc;
            stLocalBuffer.dwBufferSize = sizeof(rc);
            DWORD dwGetRectRet = 0;
            if ( FALSE == SendRemoteMessage(TB_GETRECT, dwIndexOrCmdID, &stLocalBuffer, dwGetRectRet ) ) {
                break;;
            }

            if ( 0 == dwGetRectRet ) {
                break;
            }

            MouseMoveOnWindow(m_hWnd, &rc);
        }
    } while (0);
    
    return bContinue;
}
VOID MouseMoveOnWindow( HWND hWnd, LPRECT lpRect )
{
    if ( FALSE == ::IsWindow(hWnd) || NULL == lpRect) {
        return;
    }

    RECT rc;
    memset(&rc, 0, sizeof(rc));
    if ( FALSE == ::GetWindowRect(hWnd, &rc) ) {
        return;
    }

    // 滑动的点
    POINT pt;

    DWORD dwStart = 0;
    DWORD dwEnd = 0;

    dwStart = lpRect->left;
    dwEnd = lpRect->right;

    pt.y = (lpRect->top + lpRect->bottom)/2;

    for ( DWORD loffset = dwStart; loffset < dwEnd; loffset = loffset + STOPLENGTH) {
        pt.x =  loffset; 
        ::PostMessage(hWnd, WM_MOUSEMOVE, 0, MAKELONG(pt.x, pt.y));
        Sleep(10);
    }
}

使用IAccessible接口枚举并删除“僵尸”图标

之前的方案看似已经可以满足我们的需求了,但是其中存在一个问题:如果我们进程权限很低,将无法打开Explorer进程,进而之后的发送消息也将无法谈起。当我在MSDN查阅通知区域相关文档时,无意中看到我们可以使用IAccessible接口查询到通知区域的信息。
我并不打算在此详细介绍IAccessible接口的枚举方法,只是要提出一点:因为我们无法使用IAccessible接口删除图标,所以我们在找到“僵尸”图标后,将使用上面的模拟鼠标的方法。对应的代码是
#include "Accessible.h"

BOOL EnumAccessible( HWND hwnd, XENUMACCESSIBLEPROC lpEnumAccessibleProc )
{
    BOOL bRet = FALSE;

    _ASSERTE (::IsWindow(hwnd));
    _ASSERTE(lpEnumAccessibleProc);

    if (::IsWindow(hwnd) && lpEnumAccessibleProc)
    {
        CComPtr<IAccessible> pIAcc;

        HRESULT hr = AccessibleObjectFromWindow(hwnd, OBJID_WINDOW, 
            IID_IAccessible, (void**)&pIAcc);

        if (SUCCEEDED(hr) && pIAcc)
        {
            CComVariant varChild;
            CComPtr<IAccessible> pIAccChild;
            FindChild(pIAcc, pIAccChild, varChild, lpEnumAccessibleProc);
            bRet = TRUE;
        }
    }
    return bRet;
}

static BOOL FindChild(CComPtr<IAccessible>& pIAccParent, CComPtr<IAccessible>& pIAccChild,
    CComVariant& varChild, XENUMACCESSIBLEPROC lpEnumAccessibleProc)
{
    BOOL bSuc = FALSE;
    BOOL bContinue = TRUE;
    do {
        if ( NULL == pIAccParent || NULL ==lpEnumAccessibleProc) {
            break;
        }

        BOOL bContinue = TRUE;

        CComPtr<IEnumVARIANT> pEnum;
        HRESULT hr = pIAccParent->QueryInterface(IID_IEnumVARIANT, (PVOID*) &pEnum);
        if ( SUCCEEDED(hr) && pEnum) {
            pEnum->Reset();
        }

        // get child count
        long nChildren = 0;
        unsigned long nFetched = 0;

        pIAccParent->get_accChildCount(&nChildren);
        for (long index = 1; (index <= nChildren) && bContinue; index++) {
            varChild.Clear();

            if ( pEnum ) {
                hr = pEnum->Next(1, &varChild, &nFetched );
                if ( FAILED(hr)) {
                    bContinue = FALSE;
                    break;
                }
            }
            else {
                varChild.vt = VT_I4;
                varChild.lVal = index;
            }

            // get IDispatch interface for the child
            CComPtr<IDispatch> pDisp;
            if ( VT_I4 == varChild.vt ) {
                hr = pIAccParent->get_accChild(varChild, &pDisp);
            }
            else if ( VT_DISPATCH == varChild.vt ) {
                pDisp = varChild.pdispVal;
            }

            // get IAccessible interface for the child
            CComPtr<IAccessible> pCAcc;
            if ( NULL != pDisp ) {
                hr = pDisp->QueryInterface(IID_IAccessible, (void**)&pCAcc);
                if ( FAILED(hr) ) {
                    continue;
                }
            }

            // get information about the child
            if ( NULL != pCAcc) {
                varChild.Clear();
                varChild.vt = VT_I4;
                varChild.lVal = CHILDID_SELF;
                pIAccChild = pCAcc;
            }
            else {
                pIAccChild = pIAccParent;
            }

            DWORD dwState = 0;
            if ( FALSE == GetObjectState(pIAccChild, varChild, dwState) ) {
                continue;
            }

            // check if object is available
            if (dwState & STATE_SYSTEM_INVISIBLE ) {
                continue;
            }

            HWND hwndChild = 0;
            WindowFromAccessibleObject(pIAccChild, &hwndChild);

            // call enum callback
            bContinue = lpEnumAccessibleProc(pIAccChild, varChild, hwndChild);

            if (bContinue && pCAcc) {
                bContinue = FindChild(pCAcc, pIAccChild, varChild, lpEnumAccessibleProc);
            }
        }

        bSuc = TRUE;
    } while (0);
    return bContinue;
}

BOOL GetObjectState( CComPtr<IAccessible>& pAcc, CComVariant& varChild, DWORD& dwState )
{
    BOOL bRet = FALSE;
    dwState = 0;
    do {
        if ( NULL == pAcc ) {
            break;
        }

        CComVariant varState;
        HRESULT hr = pAcc->get_accState(varChild, &varState);
        if ( FAILED(hr) || VT_I4 != varState.vt ) {
            break;
        }

        dwState = varState.lVal;
        bRet = TRUE;
    } while (0);

    return bRet;
}

BOOL GetObjectRole( CComPtr<IAccessible>& pAcc, CComVariant& varChild, DWORD& dwRole )
{
    BOOL bRet = FALSE;
    dwRole = 0;
    do {
        if ( NULL == pAcc ) {
            break;
        }

        CComVariant varRole;
        HRESULT hr = pAcc->get_accRole(varChild, &varRole);
        if ( FAILED(hr) || VT_I4 != varRole.vt ) {
            break;
        }

        dwRole = varRole.lVal;
        bRet = TRUE;
    } while (0);

    return bRet;
}

BOOL GetObjectName( CComPtr<IAccessible>& pAcc, CComVariant& varChild, LPVOID lpName, DWORD dwBufferSize, DWORD& dwWrite )
{
    BOOL bRet = FALSE;
    do {
        if ( NULL == pAcc || NULL == lpName ) {
            break;
        }

        CComBSTR bstrName;
        HRESULT hr = pAcc->get_accName(varChild, &bstrName);
        if ( FAILED(hr) ) {
            break;
        }

        if ( dwBufferSize < bstrName.ByteLength() ) {
            break;
        }

        if ( 0 != memcpy_s(lpName, dwBufferSize, (LPWSTR)bstrName, bstrName.ByteLength()) ) {
            break;
        }

        dwWrite = bstrName.ByteLength();
        bRet = TRUE;
    } while (0);

    return bRet;
}

BOOL GetObjectRoleString( CComPtr<IAccessible>& pAcc, CComVariant& varChild, LPVOID lpBuffer, DWORD dwBufferLength, DWORD& dwWrite )
{
    BOOL bRet = FALSE;
    DWORD dwRole = 0;
    do {
        if ( NULL == pAcc || NULL == lpBuffer ) {
            break;
        }
        CComVariant varRole;
        HRESULT hr = pAcc->get_accRole(varChild, &varRole);
        if ( FAILED(hr) ) {
            break;
        }

        if ( VT_I4 == varRole.vt ) {
            dwRole = varRole.lVal;
            dwWrite = ::GetRoleText(dwRole, (LPWSTR)lpBuffer, dwBufferLength / sizeof(WCHAR));
            if ( 0 == dwWrite ) {
                break;
            }
            dwWrite *= sizeof(WCHAR);
        }
        else if ( VT_BSTR == varRole.vt ) {
            CComBSTR bstrRoletext(varRole.bstrVal);
            if ( dwBufferLength < bstrRoletext.ByteLength() ) {
                break;
            }
            if ( 0 != memcpy_s(lpBuffer, dwBufferLength, (LPWSTR)bstrRoletext, bstrRoletext.ByteLength())) {
                break;
            }
            dwWrite = bstrRoletext.ByteLength();
        }

        bRet = TRUE;
    } while (0);

    return bRet;
}

BOOL GetObjectDescription( CComPtr<IAccessible>& pAcc, CComVariant& varChild, LPVOID lpBuffer, DWORD dwBufferLength, DWORD& dwWrite )
{
    BOOL bRet = FALSE;

    do {
        if ( NULL == pAcc || NULL == lpBuffer ) {
            break;
        }
        CComBSTR bstrDescription;
        HRESULT hr = pAcc->get_accDescription(varChild, &bstrDescription);
        if ( FAILED(hr) ) {
            break;
        }

        if ( dwBufferLength < bstrDescription.ByteLength() ) {
            break;
        }

        if ( 0 != memcpy_s(lpBuffer, dwBufferLength, (LPWSTR)bstrDescription, bstrDescription.ByteLength()) ) {
            break;
        }
        
        dwWrite = bstrDescription.ByteLength();
        bRet = TRUE;
    } while (0);

    return bRet;
}

BOOL GetObjectValue( CComPtr<IAccessible>& pAcc, CComVariant& varChild, LPVOID lpBuffer, DWORD dwBufferLength, DWORD& dwWrite )
{
    BOOL bRet = FALSE;
    do {
        if ( NULL == pAcc || NULL == lpBuffer ) {
            break;
        }
        CComBSTR bstrValue;
        HRESULT hr = pAcc->get_accValue(varChild, &bstrValue);
        if ( FAILED(hr) ) {
            break;
        }

        if ( dwBufferLength < bstrValue.ByteLength() ) {
            break;
        }

        if ( 0 != memcpy_s(lpBuffer, dwBufferLength, (LPWSTR)bstrValue, bstrValue.ByteLength() ) ) {
            break;
        }

        dwWrite = bstrValue.ByteLength();
        bRet = TRUE;
    } while (0);
    return bRet;
}

BOOL GetObjectLocation( CComPtr<IAccessible>& pAcc, CComVariant& varChild, RECT& rect )
{
    BOOL bRet = FALSE;

    do {
        if ( NULL == pAcc) {
            break;
        }

        HRESULT hr = pAcc->accLocation(&rect.left, 
            &rect.top, &rect.right, &rect.bottom, varChild);
        if ( FAILED(hr) ) {
            break;
        }

        // accLocation returns width and height
        rect.right += rect.left;
        rect.bottom += rect.top;

        bRet = TRUE;
    } while (0);

    return bRet;
}

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