将数组从 Julia 发送到 Rust(使用 "ccall")
Send array from Julia to Rust (using "ccall")
谁能解释一下?如何使用“ccall
”函数将任何数组从 julia 发送到 rust。发送usial变量或者常量都没有问题
我有 Julia
代码:
A = Array{Float64,1}(undef, 2)
print("A is ",A, "\n")
ccall((:recvstruct, "target/debug/liblib"),Float64, (Ref{Array{Float64,1}}, Int32,), A, sizeof(A))
和Rust
代码
#[no_mangle]
pub extern fn recvstruct(vec: &mut Vec<f64> , len: usize){
println!("reiceved?: {:?}", len);
println!("reiceved?: {:?}", vec);
}
输出为:
A is [0.0, 0.0]
Hello from cargo
reiceved?: 16
和奇怪的无尽数组:
, 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000069329110091509, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915405, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915405, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915563, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915563, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915563, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000069329110091572, 0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
朱莉娅已安装:Version 1.5.2
铁锈(货物):cargo 1.49.0 (d00d64df9 2020-12-05)
朱莉娅这边
在 ccall
的 (argtype1, ...)
中,将 recvstruct
的第一个参数的类型声明为指向具有 Ptr{T}
.
的内存地址的指针
直接来自 ccall docs
:
Each argvalue to the ccall will be converted to the corresponding argtype, by automatic insertion of calls to unsafe_convert(argtype, cconvert(argtype, argvalue))
传递数组元素的数量而不是数组的字节大小:
a = [2.0, 3.0]
result = ccall((:recvstruct, "target/debug/liblib"), Float64, (Ptr{Float64}, UInt,), a, length(a))
println("got: $result")
锈面
将 recvstruct
的第一个参数声明为指向 float64
数组的内存指针。
此外,使用 slice::from_raw_parts
获取值切片。
例如:
#[no_mangle]
pub extern "C" fn recvstruct(array_ptr: *const f64, len: usize) -> f64 {
_recvstruct(unsafe {
std::slice::from_raw_parts(array_ptr as *const f64, len)
}, len)
}
fn _recvstruct(vec: &[f64] , len: usize) -> f64 {
match len {
2 => vec[0] * vec[1],
_ => 0.0
}
}
请注意,from_raw_parts
被标记为不安全。手册页的安全部分包含所有需要考虑的细节。
谁能解释一下?如何使用“ccall
”函数将任何数组从 julia 发送到 rust。发送usial变量或者常量都没有问题
我有 Julia
代码:
A = Array{Float64,1}(undef, 2)
print("A is ",A, "\n")
ccall((:recvstruct, "target/debug/liblib"),Float64, (Ref{Array{Float64,1}}, Int32,), A, sizeof(A))
和Rust
代码
#[no_mangle]
pub extern fn recvstruct(vec: &mut Vec<f64> , len: usize){
println!("reiceved?: {:?}", len);
println!("reiceved?: {:?}", vec);
}
输出为:
A is [0.0, 0.0]
Hello from cargo
reiceved?: 16
和奇怪的无尽数组:
, 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000069329110091509, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915405, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915405, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915563, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915563, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291100915563, 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000693291559949425, 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000069329110091572, 0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
朱莉娅已安装:Version 1.5.2
铁锈(货物):cargo 1.49.0 (d00d64df9 2020-12-05)
朱莉娅这边
在 ccall
的 (argtype1, ...)
中,将 recvstruct
的第一个参数的类型声明为指向具有 Ptr{T}
.
直接来自 ccall docs
:
Each argvalue to the ccall will be converted to the corresponding argtype, by automatic insertion of calls to unsafe_convert(argtype, cconvert(argtype, argvalue))
传递数组元素的数量而不是数组的字节大小:
a = [2.0, 3.0]
result = ccall((:recvstruct, "target/debug/liblib"), Float64, (Ptr{Float64}, UInt,), a, length(a))
println("got: $result")
锈面
将 recvstruct
的第一个参数声明为指向 float64
数组的内存指针。
此外,使用 slice::from_raw_parts
获取值切片。
例如:
#[no_mangle]
pub extern "C" fn recvstruct(array_ptr: *const f64, len: usize) -> f64 {
_recvstruct(unsafe {
std::slice::from_raw_parts(array_ptr as *const f64, len)
}, len)
}
fn _recvstruct(vec: &[f64] , len: usize) -> f64 {
match len {
2 => vec[0] * vec[1],
_ => 0.0
}
}
请注意,from_raw_parts
被标记为不安全。手册页的安全部分包含所有需要考虑的细节。