使用mfc CHtmlView内存泄露解决方法

第一步，谷歌有文章说CHtmlView部分api使用BSTR没释放：

解决方法是重写一下接口：

CString GetFullName() const;

CString GetFullName() const;

CString GetType() const;

CString GetLocationName() const;

CString GetLocationURL() const;

void Navigate(LPCTSTR URL, DWORD dwFlags = ,

LPCTSTR lpszTargetFrameName = NULL,

LPCTSTR lpszHeaders = NULL, LPVOID lpvPostData = NULL,

DWORD dwPostDataLen = );

BOOL LoadFromResource(LPCTSTR lpszResource);

BOOL LoadFromResource(UINT nRes);

CString CHtmlViewEx::GetFullName() const

{

    ASSERT(m_pBrowserApp != NULL);

    BSTR bstr;

    m_pBrowserApp->get_FullName(&bstr);

    CString retVal(bstr);

    SysFreeString(bstr); // Added this line to prevent leak.

    return retVal;

}

CString CHtmlViewEx::GetType() const

{

    ASSERT(m_pBrowserApp != NULL);

    BSTR bstr;

    m_pBrowserApp->get_Type(&bstr);

    CString retVal(bstr);

    SysFreeString(bstr); // Added this line to prevent leak.

    return retVal;

}

CString CHtmlViewEx::GetLocationName() const

{

    ASSERT(m_pBrowserApp != NULL);

    BSTR bstr;

    m_pBrowserApp->get_LocationName(&bstr);

    CString retVal(bstr);

    SysFreeString(bstr); // Added this line to prevent leak.

    return retVal;

}

CString CHtmlViewEx::GetLocationURL() const

{

    ASSERT(m_pBrowserApp != NULL);

    BSTR bstr;

    m_pBrowserApp->get_LocationURL(&bstr);

    CString retVal(bstr);

    SysFreeString(bstr); // Added this line to prevent leak.

    return retVal;

}

void CHtmlViewEx::Navigate(LPCTSTR lpszURL, DWORD dwFlags /*= 0*/, LPCTSTR lpszTargetFrameName /*= NULL*/, LPCTSTR lpszHeaders /*= NULL*/, LPVOID lpvPostData /*= NULL*/, DWORD dwPostDataLen /*= 0*/)

{

    CString strURL(lpszURL);

    BSTR bstrURL = strURL.AllocSysString();

    COleSafeArray vPostData;

    if (lpvPostData != NULL)

    {

        if (dwPostDataLen == )

            dwPostDataLen = lstrlen((LPCTSTR)lpvPostData);

        vPostData.CreateOneDim(VT_UI1, dwPostDataLen, lpvPostData);

    }

    m_pBrowserApp->Navigate(bstrURL, COleVariant((long)dwFlags, VT_I4), COleVariant(lpszTargetFrameName, VT_BSTR),

        vPostData, COleVariant(lpszHeaders, VT_BSTR));

    SysFreeString(bstrURL); // Added this line to prevent leak.

}

BOOL CHtmlViewEx::LoadFromResource(LPCTSTR lpszResource)

{

    HINSTANCE hInstance = AfxGetResourceHandle();

    ASSERT(hInstance != NULL);

    CString strResourceURL;

    BOOL bRetVal = TRUE;

    LPTSTR lpszModule = new TCHAR[_MAX_PATH];

    if (GetModuleFileName(hInstance, lpszModule, _MAX_PATH))

    {

        strResourceURL.Format(_T("res://%s/%s"), lpszModule, lpszResource);

        Navigate(strResourceURL, , , );

    }

    else

        bRetVal = FALSE;

    delete[] lpszModule;

    return bRetVal;

}

BOOL CHtmlViewEx::LoadFromResource(UINT nRes)

{

    HINSTANCE hInstance = AfxGetResourceHandle();

    ASSERT(hInstance != NULL);

    CString strResourceURL;

    BOOL bRetVal = TRUE;

    LPTSTR lpszModule = new TCHAR[_MAX_PATH];

    if (GetModuleFileName(hInstance, lpszModule, _MAX_PATH))

    {

        strResourceURL.Format(_T("res://%s/%d"), lpszModule, nRes);

        Navigate(strResourceURL, , , );

    }

    else

        bRetVal = FALSE;

    delete[] lpszModule;

    return bRetVal;

}

第二步，由于加载页面js脚本并没有释放js变量所分配的内存，有两种解决方法：第一种，调用本地html文件，调用CollectGarbage()接口回收变量的内存，html文件代码如下：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

</head> 

<body>

    <script type="text/javascript">

        if (typeof window.CollectGarbage === 'function') {

            CollectGarbage()

        }

    </script>

</body>

</html>

第二种：如果不需要调用html页面的js代码，可以直接关闭IE浏览器的js脚本功能：https://jingyan.baidu.com/article/48206aead44e53216ad6b397.html

转载请注明出处，from博客园hemjohn

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使用mfc CHtmlView内存泄露解决方法

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