JNA :从指向结构指针的指针获取值

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;

public class JNADemo {
    public interface MyLibrary extends Library {
        MyLibrary INSTANCE = Native.load("mylib", MyLibrary.class);
        
        void getStructValue(Pointer pointer);
    }
    
    public interface MyStruct extends Structure {
        // 定义结构体字段
        int field1;
        float field2;
        
        // 指定字段的偏移量和数据类型
        @Override
        @Structure.FieldOrder({ "field1", "field2" })
        public class ByValue extends MyStruct implements Structure.ByValue { }
    }
    
    public static void main(String[] args) {
        MyLibrary myLib = MyLibrary.INSTANCE;
        MyStruct.ByValue myStruct = new MyStruct.ByValue();
        
        // 获取结构指针的值
        myLib.getStructValue(Pointer.createPointer(myStruct.getPointer()));
        
        // 访问结构体字段的值
        System.out.println("field1: " + myStruct.field1);
        System.out.println("field2: " + myStruct.field2);
    }
}