Hello colleagues,
i'm trying to use unsafe_wrap from a pointer from an external call
(cfunction) to an array access.
Looks like i have type problems:
function read_from_stream_callback(s::IO, buf::Ptr{UInt8}, len::UInt32)
#b1 = zeros(UInt8,len)
#nb = readbytes!(s,b1,len)
#for i=1:len
# unsafe_store!(buf,b1[i],i)
#end
b1 = zeros(UInt8,len)
unsafe_wrap(b1,buf,len)
nb = readbytes!(s,b1,len)
@compat(Int32(0))
end
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|__/ | x86_64-linux-gnu
julia> include("png_stream.jl")
ERROR: LoadError: MethodError: no method matching
unsafe_wrap(::Array{UInt8,1}, ::Ptr{UInt8}, ::UInt32)
Closest candidates are:
unsafe_wrap(::Type{String}, ::Union{Ptr{Int8},Ptr{UInt8}}, ::Integer) at
pointer.jl:86
unsafe_wrap(::Type{String}, ::Union{Ptr{Int8},Ptr{UInt8}}, ::Integer,
::Bool) at pointer.jl:86
unsafe_wrap{T}(::Union{Type{Array{T,1}},Type{Array{T,N}},Type{Array}},
::Ptr{T}, ::Integer) at pointer.jl:57
...
in read_from_stream_callback(::Base.AbstractIOBuffer{Array{UInt8,1}},
::Ptr{UInt8}, ::UInt32) at /home/lobi/juliarepo/png_stream.jl:16
in read_png_from_stream(::Base.AbstractIOBuffer{Array{UInt8,1}}) at
/home/lobi/juliarepo/png_stream.jl:26
in include_from_node1(::String) at ./loading.jl:426
while loading /home/lobi/juliarepo/png_stream.jl, in expression starting on
line 55
to which i somehow disagree (as long as UInt32 is an Integer).
the commented code runs correctly (copy to but UInt8 seq.)
A better explaination of the error?
Wishing a happy day,
Andreas
