JNA 调用dll jna调用 c++

package me.giraffetree.jnafunc; import com.sun.jna.*; import lombok.Data; /** * @author GiraffeTree * @date 2019/10/25 */ public class Hello { public interface JnaLibrary extends Library { // JNA 为 dll 名称 JnaLibrary INSTANCE = Native.load("JNA", JnaLibrary.class); int max(int a, int b); void getBool(boolean x); void testArray(short[] vals, int len); void testStruct(ArrInfo arrInfo); void printUser(User.ByValue user); void printUserRef(User user); @Data @Structure.FieldOrder({"name", "height", "weight"}) public static class User extends Structure { public static class UserValue extends User implements Structure.ByValue { public UserValue(String name, int height, double weight) { super(name, height, weight); } } public User(String name, int height, double weight) { this.name = name; this.height = height; this.weight = weight; } public String name; public int height; public double weight; } @Data @Structure.FieldOrder({"vals", "len"}) public static class ArrInfo extends Structure { public Pointer vals; public int len; public ArrInfo(Pointer vals, int len) { this.vals = vals; this.len = len; } } } public static void main111(String[] args) { testBool(); testMax(); testArray(); testUser(); testPointer(); } public static void testBool() { // c++ output: // bool: 255 in true JnaLibrary.INSTANCE.getBool(true); } public static void testMax() { int max = JnaLibrary.INSTANCE.max(100, 200); // out: 200 System.out.println(max); } public static void testArray() { JnaLibrary.INSTANCE.testArray(new short[]{1, 2, 3, 4}, 4); } public static void testUser() { JnaLibrary.User.UserValue user1 = new JnaLibrary.User.UserValue("user1", 186, 65.2); JnaLibrary.INSTANCE.printUserRef(user1); JnaLibrary.INSTANCE.printUser(user1); // out: // printUserRef user: user1 height: 186 weight: 65.20 // printUser user: user1 height: 186 weight: 65.20 } public static void testPointer() { // java main test int len = 3; int shortSize = Native.getNativeSize(Short.class); Pointer pointer = new Memory(len * shortSize); for (int i = 0; i < len; i++) { pointer.setShort(shortSize * i, (short) i); } JnaLibrary.ArrInfo arrInfo = new JnaLibrary.ArrInfo(pointer, len); JnaLibrary.INSTANCE.testStruct(arrInfo); // out // arrInfo[0]: 0 // arrInfo[1]: 1 // arrInfo[2]: 2 } }