How to convert dart:ffi Char to String

Question

I have a dart:ffi Struct that contains a pointer to a Char and int len

class UnnamedStruct1 extends ffi.Struct {
  external ffi.Pointer<ffi.Char> ptr;

  @ffi.Int()
  external int len;
}

it is supposed to represent a String (later to parse as Uri) how do I convert it to a string

Answer 1

you can create a function to convert the UnnamedStruct1 instance to a Dart String

String unnamedStruct1ToString(UnnamedStruct1 struct) {
  // Cast the pointer to a Pointer<Uint8>
  ffi.Pointer<ffi.Uint8> uint8Pointer = struct.ptr.cast<ffi.Uint8>();

  // Create a Dart String from the Utf8 encoded data
  String result = ffi.Utf8.fromUtf8(uint8Pointer, struct.len);

  return result;
}


void main() {
  // Assuming you have an instance of UnnamedStruct1 called myStruct
  UnnamedStruct1 myStruct = // ... initialize your struct here

  // Convert the struct to a Dart String
  String myString = unnamedStruct1ToString(myStruct);

  // Print the resulting string
  print(myString);
}

This should do it