JNI。 如何从jobject获取jstring并将其转换为char *

这就是我到目前为止：我传递一个有2个字段的对象：String和Integer，作为参数，我想发送信息来处理它在C部分，这在这一点上并不重要…我得到抱怨在jstring声明

JNIEXPORT jint JNICALL Java_Tier3_NativeMethods_totalPalletsIn( JNIEnv *env, jclass cls, jobject stat) { jclass staticsitcs = (*env)->GetObjectClass(env, stat); // Here I try to get it using the ID jfieldID idDate = (*env)->GetFieldID(env, staticsitcs, "date", "S"); jstring dateString = (jstring)(*env)->GetStringRegion(env, stat, idDate); // Here converting whatever I get in jstring to char* char* date = (*env)->GetStringUTFChars(env,dateString,0); // Getting the 2nd field from the object jfieldID idNumber = (*env)->GetFieldID(env, staticsitcs, "amount", "I"); jint amount = (*env)->GetDoubleField(env, stat, idNumber); // Calling C method jint totalPallets = checkTotalPalletsIn(date, amount); (*env)->ReleaseStringUTFChars(env, dateString, date); return totalPallets; } 

我错过了什么？

Answer 1

jstring dateString = (jstring)(*env)->GetObjectField(env, stat, idDate);

……之后一切都还好。