Hi,all:
I want to write a program. application is writed by JAVA, and
really feature is implemented in JNI.
Next is JNI C code:
JNIEXPORT void JNICALL Java_jprint_print(JNIEnv *env, jobject obj)
{
{
remove("/data/a.log");
rename("/data/b.log", "/data/c.log");
}
printf("================hello jni===================\r\n");
}
JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *reserved)
{
JNIEnv *env;
JNINativeMethod meth;
jclass k;
jint r;
/*notes: next code will fail*/
{
remove("/data/a.log");
rename("/data/b.log", "/data/c.log");
}
r = (*vm)->GetEnv (vm, (void **) &env, JNI_VERSION_1_4);
k = (*env)->FindClass (env, "com.android.helloactivity.jprint");
meth.name = "print";
meth.signature = "()V";
meth.fnPtr = Java_jprint_print;
r = (*env)->RegisterNatives (env, k, &meth, 1);
return JNI_VERSION_1_4;
}
In my program, sometimes, I have to access file or display device via
JNI C code.
But the 'remove' and 'rename' do not be implemented successfully.
It is successful when I run native C application that call
Java_jprint_print() in emulator.
So I think the failed reason is caused by JAVA application permission.
Our JNI .so will be flash into manufactory's rom. so it is safe.
Who can tell me how to invoke write operation(like write file) in
Android JNI?
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