How to open file through file descripter in java?

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Java

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Android

How to open File from File Descriptor?

Posted 10-Dec-14 3:22am

Sarita S

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2 solutions

Solution 3

I have planed the following thing,please tell me will it possible?
1.Decided to execute lsof command in android program itself for the process
(Android each app is represented by separate process,so i will able to retrieve its process id)
so command will be
>lsof ProcessIDOfApp
output will be table containing FD as well as is name including other information
2.Map the FD to its name
when we get the file name we will able to create the input/output stream.

Posted 11-Dec-14 19:05pm

Sarita S

Updated 11-Dec-14 22:26pm

v3

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Richard MacCutchan 12-Dec-14 5:27am

What happens when you try it?

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Richard MacCutchan · Accepted Answer · 2014-12-10T03:55:00

Solution 1

See http://docs.oracle.com/javase/7/docs/api/java/io/FileDescriptor.html[^].

Posted 10-Dec-14 3:55am

Richard MacCutchan

Comments

Sarita S 10-Dec-14 10:09am

I have File Descriptor which is integer value.
How Could I Construct the FileDescripter object from it.? or
How Could open File from File descripter.?

Richard MacCutchan 10-Dec-14 10:13am

See http://docs.oracle.com/javase/7/docs/api/java/io/FileInputStream.html. Information like this is all available in the documentation.

Sarita S 10-Dec-14 10:17am

Actually FileInputStream require FileDescriptor object to open the input stream.But I don't have FileDescriptor object.I just have File descriptor which is integer value.I tried
FileDescriptor obj=new FileDescriptor(fd);
Here fd is file descriptor containing integer value.
But It did not work.

Richard MacCutchan 10-Dec-14 10:55am

An integer is not a file descriptor, you need to provide more information. Where does that number come from and what are you trying to do with it?

Sarita S 10-Dec-14 23:10pm

I need to retrive Input and Output stream of USB device in android.
I tried
int fd = UsbDeviceConnection.getFileDescriptor();
Above statement return file descriptor which is the integer value.
How could I construct FileDescriptor objcet from this integer value?

Richard MacCutchan 11-Dec-14 3:59am

Sorry, no idea. But I suggest you research Android access to USB devices, I doubt that it is this simple.