I'm trying to pass a Data of allocated size to a C function for it to fill in:
lib_example_call(_ params: UnsafePointer<lib_call_params_t>!, _ data:
UnsafeMutableRawPointer!)
...
{
self.dataBuffer = Data(capacity: BufferSizeConstant)
var params = lib_call_params_t();
params.data_capacity = BufferSizeConstant;
self.dataBuffer?.withUnsafeMutableBytes
{ (inBuffer) -> Void in
lib_example_call(¶ms, inBuffer)
}
}
I later get called back by the library with a size value of the actual data it
got. self.dataBuffer is a var. I set self.dataBuffer?.count = result size,
which is a reasonable value.
Unfortunately, the resulting buffer is all zeros. The data generated by the
call is definitely not all zero, and a C example program using the same library
works correctly.
So, I think there's something wrong in the way I'm making the call.
Can anyone please enlighten me? Thanks!
--
Rick Mann
[email protected]
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