Reading a C extract from Java

[amarg]

Hi,

I am trying to write some utlity program, where I need to read a extract file from JAVA program. Extract is mainly written by C or COBOL process.

In Java, I already manage to get the information about the C or COBOL structure which is used to write the extract, like

Field (int, float, double, long chat etc)
Starting position
Storage (e.g, int will take 4 bytes. float will take 8 bytes etc).

Now I need some guidence, what should I use to read first 4 bytes and convert it into int. and same for other type too.

Thanks,
Amar

 

[Diancecht]

You mean read from a file? What did you try so far?

Cheers,
Dian

 

[drdad5727]

Oooh this can be tricky. Let's assume the files were written on the same machine type as they're being read on, so there's no Endian problem.

Have a look at java.io.DataInput. It should do what you want.

 

[stefanwagner]

Are you writing the data yourself? Write it in a simple, human-readable way, if possible.

For a repetitive structure use CSV, for changing structures use XML.

Binary data is hard to debug.

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