iranian citizen need visa for macau and hong kong befor depurture or they will get upon arival

hi. i am an Iranian citizen an i am going to attend in 19 world congress in obstetric and gynecology which will be held in Macau 20-23 Feb 2014. my question is do i need to get one for Macau and Hong Kong as well as mainland china or i will get the visa upon arrival at the airport.
best regard