AccessibleObjectFromPoint

Saturday, October 10, 2009 5:57 PMJigs Patel

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Dear All,

I had small VC++ 6.0 MFC based application which does call a below
function in timer of 1 second.
The function gets data under mouse

Problem:
I am having memory leakage with this function. if i
comment out this function calling then there is no leakage.

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bool CTextUnderMouse::GetTextUnderMouse(CString& sName,CString&
sValue,CString& sRole,CString& sExeName)
{
CPoint CursorPos;
GetCursorPos(&CursorPos);
IAccessiblePtr pIAcc;
_variant_t vt,vtValue;

if (SUCCEEDED(AccessibleObjectFromPoint (CursorPos,&pIAcc,&vt)))
{

sName.Empty();
BSTR pName = NULL;
if ( SUCCEEDED( pIAcc->get_accName(vt, &pName)))
{
if (pName && ::SysStringLen(pName))
{
sName = pName;
}
::SysFreeString(pName);
}

vt.Clear();
sValue.Empty();
BSTR pValue = NULL;
if (SUCCEEDED( pIAcc->get_accValue(vtValue,&pValue)))
{
if (pValue && ::SysStringLen(pValue))
{
sValue += pValue;
}

::SysFreeString(pValue);
}

vtValue.Clear();

VARIANT vChild;
vChild.vt = VT_I4;
vChild.lVal = CHILDID_SELF;
VARIANT vResult;
DWORD dwRoleID;
if (SUCCEEDED( pIAcc->get_accRole(vChild,&vResult)))
{
if (vResult.vt == VT_I4)
{
dwRoleID = vResult.lVal;
UINT nRoleLength;
CString sRoleString;
nRoleLength = GetRoleText(dwRoleID,NULL,
0);
LPTSTR lpszRoleString = (LPTSTR)malloc
((nRoleLength + 1) * sizeof
(TCHAR));
GetRoleText
(dwRoleID,lpszRoleString,nRoleLength + 1);
sRole = lpszRoleString;
free(lpszRoleString);
}
}

VariantClear(&vResult);

VariantClear(&vt);
sExeName.Empty();
HWND hWnd = NULL;
if ((hWnd = WindowFromPoint(CursorPos)) != NULL)
{
DWORD dwProcessID,dwThreadID;
CWnd* pCurrentWnd = CWnd::FromHandle(hWnd);
sExeName = GetWindowModuleName
(pCurrentWnd,dwProcessID,dwThreadID);
}

pIAcc->Release()
return true;
}
return false;

}

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----------------------------------------

Do anyone see problem with this code or somthing is missing in it?

If i keep my application running full day and then at end of day if i observer memory usage in task manager then it shows more memory than i started my program.

I am not expert in com programming. Please help me to fix this issue.

Also i used Application verifier but it does not show me any leakage.

I am

Regards,

Jignesh
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