JNI模板

 1 #include <stdio.h>
 2 #include <jni.h>
 3 
 4 jint ledOpen(JNIEnv *env, jobject cls)
 5 {
 6     printf("all led opened\n");
 7     return 0;
 8 }
 9 
10 jint ledCtrl(JNIEnv *env, jobject cls, jint which, jint status)
11 {
12     printf("status of %d is %d \n", which, status);
13     return 0;
14 }
15 
16 void ledClose(JNIEnv *env, jobject cls)
17 {
18     printf("all led closed\n");
19 }
20 
21 static JNINativeMethod gMethods[] ={
22     {"ledCtrl", "(II)I", (void *)ledCtrl},
23     {"ledOpen", "()I", (void *)ledOpen},
24     {"ledClose", "()V", (void *)ledClose},
25 };
26 
27 
28 JNIEXPORT jint JNICALL
29 JNI_OnLoad(JavaVM *jvm, void *reserved)
30 {
31      JNIEnv *env;  //struct JNINativeInterface_ *
32      
33      if ((*jvm)->GetEnv(jvm, (void**) &env, JNI_VERSION_1_4)) {
34         return -1;
35      }
36      jclass cls = (*env)->FindClass(env, "com/example/hardlibrary/HardControl"); //java里面类的路径
37      if (cls == NULL) {
38          return -1;
39      }
40      if((*env)->RegisterNatives(env,cls, gMethods, sizeof(gMethods)/sizeof(gMethods[0]))< 0) {
41         return -1;
42      }
43     
44      return JNI_VERSION_1_4;
45 }