1.java String转换 C str
char* Jstring2CStr(JNIEnv* env, jstring jstr) { char* rtn = NULL; jclass clsstring = (*env)->FindClass(env,"java/lang/String"); jstring strencode = (*env)->NewStringUTF(env,"GB2312"); jmethodID mid = (*env)->GetMethodID(env,clsstring, "getBytes", "(Ljava/lang/String;)[B"); jbyteArray barr= (jbyteArray)(*env)->CallObjectMethod(env,jstr,mid,strencode); // String .getByte("GB2312"); jsize alen = (*env)->GetArrayLength(env,barr); jbyte* ba = (*env)->GetByteArrayElements(env,barr,JNI_FALSE); if(alen > 0) { rtn = (char*)malloc(alen+1); //" " memcpy(rtn,ba,alen); rtn[alen]=0; } (*env)->ReleaseByteArrayElements(env,barr,ba,0); // return rtn; }
2.传入参数 int数组jintArray jarray
int length=(*env)->GetArrayLength(env,jarray); int* array=(*env)->GetIntArrayElements(env,jarray,0);