Hi,Ralf & Volker Gropp
Thanks very much!
It is successful to write file to '/sdcard' directory via JNI.
On Aug 28, 4:14 pm, Volker Gropp <[EMAIL PROTECTED]> wrote:
> 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?- Hide quoted text -
>
> - Show quoted text -
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