C通过JNI调用JAVA——创建Object数组参数

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http://wind6266.blog.163.com/blog/static/6710907201112424521713/

C通过JNI调用JAVA——创建Object数组参数

2011-02-24 14:47:00| 分类：C / C++ | 标签：c jni java newobjectarray |字号大中小订阅

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include <tchar.h>
#include <direct.h>
#include <jni.h>

jstring jstr(JNIEnv *env,char *s){
        return (*env)->NewStringUTF(env,s);
}

int main()
{
   JavaVMOption options[1];
   JNIEnv *env;
   JavaVM *jvm;
   JavaVMInitArgs vm_args;
   long status;
   jclass cls;
   jclass str_cls;
   jmethodID mid;
    jobjectArray paramArr;

   char* class_name="com/example/Caller";

   options[0].optionString = "-Djava.class.path=.";
   vm_args.version = JNI_VERSION_1_6;
    vm_args.nOptions = 1;
    vm_args.options = options;
    vm_args.ignoreUnrecognized = JNI_TRUE;

    //return 0;

   /* Create the Java VM */
    status = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
    if (status < 0 || status == JNI_ERR) {
       printf("Status of creating Java VM:%d\n",status);
       fprintf(stderr, "Failed to create Java VM!\n");
        exit(1);
    }

   /*Find the class obj*/
   cls = (*env)->FindClass(env, class_name);
   str_cls = (*env)->FindClass(env, "java/lang/String");
   if(cls !=0)
   {
       /* ---------------------------------------------------------- */
       /*Test to invoke a static method*/
       char* static_method_name="call";
       char* static_method_sign="(Ljava/lang/String;[Ljava/lang/String;)I";

       /*Get method ID*/
       mid = (*env)->GetStaticMethodID(env, cls, static_method_name, static_method_sign);
       if(mid !=0)
       {
            /* *********************************
           create a string array
           ***********************************/
           paramArr = (*env)->NewObjectArray(env,3,str_cls,0);
           (*env)->SetObjectArrayElement(env,paramArr,0,jstr(env,"1"));
           (*env)->SetObjectArrayElement(env,paramArr,1,jstr(env,"user"));
           (*env)->SetObjectArrayElement(env,paramArr,2,jstr(env,"user123"));

           jint result = (*env)->CallStaticIntMethod(env, cls, mid,jstr(env,"check_password"),paramArr);

           printf("Call static method %s: %d\n",static_method_name,result);
       }else{
           printf("Failed to find method %s!\n",static_method_name);
       }
   }else{
       printf("Failed to find Class %s!\n",class_name);
   }

   /*destory JVM*/
   (*jvm)->DestroyJavaVM(jvm);
   return 0;
}