DataOutputStream/DataInputStream

[JScoobyCed]

Hi,

I remember having read on this newsgroup that the use of
DataInputStream/DataOutputStream is not the best choice, as other
alternatives can be found.
I am not sure but that was linked to the readLine() method in particular.
Now I have found several tutorials for J2ME that use DataXXXputStream to
writeUTF and readUTF from/to a String. This is in particular to access
the mobile database (RMS package).
Is this a really good practice and safe to use those Objects ?
Thanks

 

[Steve Horsley]

Hi,

I remember having read on this newsgroup that the use of
DataInputStream/DataOutputStream is not the best choice, as other
alternatives can be found.
I am not sure but that was linked to the readLine() method in particular.
Now I have found several tutorials for J2ME that use DataXXXputStream to
writeUTF and readUTF from/to a String. This is in particular to access
the mobile database (RMS package).
Is this a really good practice and safe to use those Objects ?
Thanks

Have a good look at the javadocs for DataXXXputStream. You will find
that they write and expect a length indicator at the front of the string.
It is unlikely that your other end behaves the same way.

You may need to use String.getBytes(String characterset) and friends,
and read and write byte arrays instead.

Steve

 

[Michael Borgwardt]

I remember having read on this newsgroup that the use of
DataInputStream/DataOutputStream is not the best choice, as other
alternatives can be found.

It always depends on what you want to do.

I am not sure but that was linked to the readLine() method in particular.

If you have text-only data, then the Reader/Writer classes are better.

Now I have found several tutorials for J2ME that use DataXXXputStream to
writeUTF and readUTF from/to a String. This is in particular to access
the mobile database (RMS package).
Is this a really good practice and safe to use those Objects ?

If you have binary data with some text fragments embedded, then it is a
good choice.