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m_pDD->SetCooperativeLevel( m_hWnd, DDSCL_NORMAL )
更改为
if(m_pDD != NULL)
{
if(m_hWnd != NULL)
{
m_pDD->SetCooperativeLevel( m_hWnd, DDSCL_NORMAL );
}
else
{
ATLTRACE("m_hWnd is NULL \n");
}
}
else
{
ATLTRACE("m_pDD is NULL \n");
}
HRESULT hr;
hr = DirectDrawCreate( NULL, &m_pDD, NULL );
if( FAILED(hr) )
{
return FALSE;
}
m_pDD->SetCooperativeLevel( m_hWnd, DDSCL_NORMAL );