[Haskell-cafe] carry "state" around ....

John Meacham john at repetae.net
Sun Jul 20 02:26:28 EDT 2008

In order to write portable code that accesses C structures, you need to
write a c shim, or better, use the 'hsc2hs' tool to produce portable
code. For an example, you can see my OpenSSL binding code in 


in particular the 'createPkey' function. the #ptr construct gets a
pointer to a member of a C structure, and #peek and #poke let you read
and set members. You should use (#const sizeof(struct foo)) to determine
how much memory you need to allocate for a structure. (unless the API
you are binding specifies some other allocation method)


John Meacham - ⑆repetae.net⑆john⑈

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