Resolving RVA's for Import and Export tables within a PE file

Question

I am currently writing a PE parser/loader. I have successfully loaded the PE file into memory using standard c file io, retrieved valid DOS and PE headers (the optional head

Answer 1

Not all PE images will have an export directory table. You need to check the optional header's Windows-specific "NumberOfRvaAndSizes" field. If it is less than or equal to IMAGE_DIRECTORY_ENTRY_EXPORT (0), then there is no export directory table (i.e. there is nothing valid located at ioh->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]).

See the answer to this question for an example.