Writing a minimal native extension
We'll start by writing a very simple extension with just one function that takes Dart's String object as an argument and returns another String object with characters in a reverse order. Let's start by defining the two mandatory C functions, as we mentioned earlier.
The implementation here is based on the official example from https://github.com/dart-lang/bleeding_edge/blob/master/dart/samples/sample_extension/sample_extension.cc:
// Header files are part of Dart SDK.
#include "include/dart_native_api.h"
#include "include/dart_api.h"
Dart_NativeFunction ResolveName(Dart_Handle name,
int argc,
bool* auto_setup_scope) {
DART_EXPORT Dart_Handle fuzzy_search_Init(
Dart_Handle parent_library) {
if (Dart_IsError(parent_library)) {
return parent_library;
}
// Register handler that is called every
// time Dart's "native" keyword is used.
Dart_Handle result_code ...