Struct StrBuilder 

pub struct StrBuilder {
    pub ptr: *const c_char,
    pub len: usize,
}

A convenience structure for calling FFI interfaces to get strings

Example

mod bindings {
    pub enum Data {}

    extern {
        pub fn get_my_data_from_c(object: *const Data, start: *mut *const c_char, size: *mut usize);
    }
}
use bindings::Data as Data;
impl Data {
    pub fn my_data(&self) -> easy_ffi_wrapper::Str {
        let mut value = easy_ffi_wrapper::StrBuilder::new();
        unsafe {
            bindings::get_my_data_from_c(self, &mut value.ptr, &mut value.len);
            value.build()
        }
    }
}

Fields

ptr: *const c_char

Pointer to the first character of the string to fill in, usually as an output parameter.

len: usize

Len of the string to fill in, usually as an output parameter.

Implementations

impl StrBuilder

pub fn new() -> Self

Creates a new builder referencing an empty string.

pub unsafe fn build<'a, 'b>(&'a self) -> Str<'b>

Construct a string from ptr + len.

No terminating \0 required, and invalid UTF8 possible.

Safety

Same as slice_from_raw_parts with self.ptr and self.len as parameters.

Trait Implementations

impl Debug for StrBuilder

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StrBuilder

fn default() -> Self

Returns the “default value” for a type.