Bytes

class Bytes

use ffi::types::{Bytes};

FFI tag for a writable byte buffer (uint8_t *) made from a Vec<byte>.

Whatever C writes there ends up in the Vec: a packed Vec<byte> is lent in place, and otherwise (a coil callback exists, the same Vec is passed twice, or its elements are stored as words) C gets a copy that is copied back after the call. No NUL terminator is added, so pass the length separately. Argument only: as a return type it is ErrorKind::Unsupported (return a Ptr instead).

See also#

• Vec
• ffi::types::Ptr
• Int: FFI tag for a 64-bit signed integer (int64_t), passed from and returned as int.
• Float: FFI tag for a 64-bit float (double), passed from and returned as float.
• String: FFI tag for a NUL-terminated C string (const char *), passed from and returned as string.
• Void: FFI tag for no value (void), valid only as a return type.
• Bool: FFI tag for a C bool (one byte, 0 or 1), passed from and returned as bool.
• Int8: FFI tag for an 8-bit signed integer (int8_t), passed from and returned as int.