LuaJIT [FFI]: pass integer to function as argument of type const void *
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- Subject: LuaJIT [FFI]: pass integer to function as argument of type const void *
- From: Vladimir Protasov <eoranged@...>
- Date: 2011年12月24日 02:14:18 +0400
Hi, guys!
Is it any way to pass int to function, expecting *void?
I cannot change type in declaration to int*, because sometimes I need to pass strings instead of integers.
To explain what I mean. Right now I'm trying to wrap some of libssh's APIs, but I have the problem with function ssh_options_set:
ffi.cdef[[
int ssh_options_set(ssh_session session, int type, const void* value);
]]
ssh = ffi.load(ssh)
-- Assuming session is initialized with appropriate value
-- ssh_option_set expects int* as third argument in following examples
ssh.ssh_options_set(session, 1, 22) -- causes error "cannot convert 'int' to 'const void *"
ssh.ssh_options_set(session, 1, ffi.new("int", 22)) -- the same error
ssh.ssh_options_set(session, 1, ffi.cast("void *", ffi.new("int", 22))) -- causes segfault
With strings everything is fine.
I've tried a lot of strange and sometimes horrible constructions, but everything causes cast error or segfault.
--
Thanks in advance,
Vladimir Protasov.