write my data on a file

[hrc1365]

how do i write any data to card? which command or class do it?
in javacard api pdf i read, by file system class can write data, but do not fine it.
pls help me.

[UNKNwYSHSA]

Look the ISOApplet, the filesystem implementation and related commands are all in it.

[hrc1365]

thanks a lot my friend.
But ISOapplet have a error when i want to install to card.error is 6985 or some times 6438.
and it's size is large, 39 kB.
do i have any way for save my data to card?????????

[UNKNwYSHSA]

thanks a lot my friend.
But ISOapplet have a error when i want to install to card.error is 6985 or some times 6438.
and it's size is large, 39 kB.
do i have any way for save my data to card?????????

The ISOApplet has four type of data structure:

1 ElementaryFileTransparent;
2 ElementaryFileLinearFixed;
3 ElementaryFileLinearVariable;
4 ElementaryFileCyclicFixed;

Maybe you need one or two, not all.

Coding for your needs:

1 Reserve the data structure your need, others can be removed.
2 Reserve code in IsoApplet.java for your need, delete unused codes.