?? fieldaccess.c
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#include <stdio.h>#include <jni.h>#include "FieldAccess.h"JNIEXPORT void JNICALL Java_FieldAccess_accessFields(JNIEnv *env, jobject obj){ jclass cls = (*env)->GetObjectClass(env, obj); jfieldID fid; jstring jstr; const char *str; jint si; printf("In C:\n"); fid = (*env)->GetStaticFieldID(env, cls, "si", "I"); if (fid == 0) { return; } si = (*env)->GetStaticIntField(env, cls, fid); printf(" FieldAccess.si = %d\n", si); (*env)->SetStaticIntField(env, cls, fid, 200); fid = (*env)->GetFieldID(env, cls, "s", "Ljava/lang/String;"); if (fid == 0) { return; } jstr = (*env)->GetObjectField(env, obj, fid); str = (*env)->GetStringUTFChars(env, jstr, 0); printf(" c.s = \"%s\"\n", str); (*env)->ReleaseStringUTFChars(env, jstr, str); jstr = (*env)->NewStringUTF(env, "123"); (*env)->SetObjectField(env, obj, fid, jstr);}?? 快捷鍵說明
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