CComBSTR::Copy
分配并返回 m_str的副本。
BSTR Copy( ) const throw();
返回值
m_str 成员的副本。 如果 m_str 是 NULL,返回 NULL。
示例
CComBSTR m_bstrURL; // BSTR representing a URL
// put_URL is the put method for the URL property.
STDMETHOD(put_URL)(BSTR strURL)
{
ATLTRACE(_T("put_URL\n"));
// free existing string in m_bstrURL & make a copy
// of strURL pointed to by m_bstrURL
m_bstrURL = strURL;
return S_OK;
}
// get_URL is the get method for the URL property.
STDMETHOD(get_URL)(BSTR* pstrURL)
{
ATLTRACE(_T("get_URL\n"));
// make a copy of m_bstrURL pointed to by pstrURL
*pstrURL = m_bstrURL.Copy(); // See CComBSTR::CopyTo
return S_OK;
}
要求
Header: atlbase.h