On Aug 28, 5:55 am, Ralf <[EMAIL PROTECTED]> wrote:
> The /data partition is read-only. Try writing to /sdcard.
>
> Reminder: Native code is not supported.
> R/
Hi,
in 0.9_r1 its mounted rw. But most directories are read only for app
users. Either create a dir using adb shell (being root) or use
context.getFileStreamPath("FileName").getAbsolutePath()) to get a
writeable path of your application.
Reminder: Native code is not supported ;-)
>
> 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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