The /data partition is read-only. Try writing to /sdcard.
Reminder: Native code is not supported.
R/
On Wed, Aug 27, 2008 at 2:06 AM, ccf2000 <[EMAIL PROTECTED]> wrote:
>
> 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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