Obtain a pointer to a C char array in Swift

Question

A have a structure like this (defined in bson.h of mongodb c driver):

typedef struct
{
  uint32_t domain;
  uint32_t code;
  char message[504];
} bson_error_         


        

Answer 1

Quick hack to retrieve message String from bson_error_t:

extension bson_error_t {
    mutating func messageString() -> String? {
        return String.fromCString(
            { (p:UnsafePointer) in UnsafePointer(p) }(&self.message.0)
        )
    }
}

// Usage:
var err: UnsafeMutablePointer = ...
...
let errMessage = err.memory.messageString()