インフォチップのテキストの取得

#pragma once

/////////////////////////////////////////////////////////////////////////////

// CQueryInfoHelper

class CQueryInfoHelper

{

public:

    CQueryInfoHelper();                            // 実装しない

    virtual ~CQueryInfoHelper();

public:

    static CString GetInfoTip(HWND hWnd, IShellFolderPtr spShellFolder, LPCITEMIDLIST pidl)

    {

        USES_CONVERSION;

        if (spShellFolder == NULL || pidl == NULL)

        {

            return CString();

        }

        HRESULT hr = S_OK;

        IQueryInfoPtr spQueryInfo;

        hr = spShellFolder->GetUIObjectOf(hWnd, 1, &pidl, IID_IQueryInfo, NULL, (void**)&spQueryInfo);

        if (FAILED(hr))

        {

            return CString();

        }

        return GetInfoTip(spQueryInfo);

    }

    static CString GetInfoTip(IQueryInfoPtr spQueryInfo)

    {

        USES_CONVERSION;

        if (spQueryInfo == NULL)

        {

            return CString();

        }

        HRESULT hr = S_OK;

        LPWSTR wszText = 0;

        hr = spQueryInfo->GetInfoTip(0, &wszText);

        if (FAILED(hr))

        {

            return CString();

        }

        CString strResult = W2T(wszText);

        Emulate_SHFree(wszText);

        return strResult;

    }

public:

    // Shlwapihelper.hよりコピー

    // shell32.dll version 5.0 or later 互換

    static void Emulate_SHFree(void* pv)

    {

        HRESULT hr = S_OK;

        IMallocPtr spMalloc;

        hr = ::SHGetMalloc(&spMalloc);

        if (FAILED(hr))

        {

            return;

        }

        spMalloc->Free(pv);

    }

};