直接上C的实现
typedef
struct
Foo {
int
len;
char
name[100];
}
Foo_t
;
JNIEXPORT jint JNICALL
Java_TestJNI_foo(JNIEnv *env, jobject obj,
jobject fooObj
) {
Foo_t * bar
= malloc(
sizeof
(Foo_t));
jclass clazz;
jfieldID fid;
//
init the bar data of C
strcpy(bar->name, "Yachun Miao");
bar->len = strlen(bar->name);
//
mapping bar of C to foo
clazz = (*env)->GetObjectClass(env, fooObj);
if
(0 == clazz) {
printf("GetObjectClass returned 0\n");
return
(-1);
}
fid = (*env)->GetFieldID(env, clazz, "len", "I");
(*env)->SetLongField(env, fooObj, fid, bar->len);
fid = (*env)->GetFieldID(env, clazz, "name", "Ljava/lang/String;");
jstring name = (*env)->NewStringUTF(env, bar->name);
(*env)->SetObjectField(env, fooObj, fid, name);
free(bar);
return
0;
}
对应的Java调用
public class Foo {
protected int len;
protected String name;
}
private
static
native
int
foo(
Foo fooObj
);
public
static
void
main(String args[]) {
System.loadLibrary("mylib");
Foo foo = new Foo();
foo(foo);
System.out.println(foo.name);
System.out.println(foo.len);
}
参考链接
http://www.steveolyo.com/JNI/JNI.html#CSTRCJ
http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/types.html
http://blog.csdn.net/vblittleboy/article/details/11763409
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