复制代码 - /*
- * Copyright (C) 2009 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
- #include <string.h>
- #include <jni.h>
- #include <fcntl.h> /*包括文件操作,如open() read() close()write()等*/
- int fd;
- /* This is a trivial JNI example where we use a native method
- * to return a new VM String. See the corresponding Java source
- * file located at:
- *
- * apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java
- */
- jstring
- Java_com_helloworld_helloworld_stringFromJNI( JNIEnv* env,
- jobject thiz )
- {
- return (*env)->NewStringUTF(env, "Hello from JNI create by carlin !");
- }
- jint Java_com_helloworld_helloworld_openled( JNIEnv* env,
- jobject thiz )
- {
- fd = open("/dev/leds0", O_RDONLY);
- if (fd < 0)
- {
- fd = open("/dev/leds", O_RDONLY);
- return 1;
- }
- return 0;
- }
- jint Java_com_helloworld_helloworld_setLedState( JNIEnv* env,
- jobject thiz ,jint ledID,jint ledState)
- {
- ioctl(fd,ledState, ledID);
- return 1;
- }
- jint Java_com_helloworld_helloworld_closeled( JNIEnv* env,
- jobject thiz )
- {
- close(fd);
- return 1;
- }
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