So I have a function in a C library that returns a uint16_t and I call it something like this (@ccall ".\\lib.dll".crc16()::UInt16) However, this gives the wrong result. But (@ccall ".\\lib.dll".crc16()::UInt16) |> x->reinterpret(UInt16, x) Gives the right result. Any clues as to what could be…

Help with reinterperating result of ccall

giordano July 30, 2025, 10:30pm 4

julia> run(`cc -shared -fPIC test.c -o libtest.dylib`);

julia> @ccall "./libtest.dylib".crc16([0x01, 0x03, 0x00, 0x10, 0x00, 0x02]::Ref{UInt8}, 6::UInt16)::UInt16
0xc5ce

3 Likes

Topic		Replies	Views
Dereference a pointer General Usage	25	4470	October 6, 2017
Pointer (Julia) not modified after ccall to C function which uses another C function General Usage ccall	16	1979	April 21, 2018
Passing a reference to Julia struct into ccall and let C manage the memory General Usage ccall , memory-allocation	4	3071	January 13, 2018
How to keep a reference for C structure to avoid GC? General Usage	25	2769	November 6, 2019
Why does `reinterpret` cause an extra allocation? General Usage	30	4264	February 24, 2018

Help with reinterperating result of ccall

Related topics