Connections between two host using Pro*C/C++ precompiler

Hello everybody
I'm trying to connect to an Oracle database using an program written in C that it's running in another host where the database is.
I put the following command:
EXEC SQL CONNECT :login IDENTIFIED BY :password AT :host;
I don't know if this is correct, host is the name of the machine where the database is.
Does anyone know how to do this kind of connections?
Thank you

It seems that I found the way to avoid this error. Now each time before I read RAW(2000) data from database, i initialize the VARRAW.len first, set its value to SIZE_DATA_SEG, i.e., the outside buffer size, then the error disappear.
Oracle seems to need this information to handle its data mapping, but why output variable also needs this initialization, cannot precompiler get this from the definition of VARRAW structure?
Anyone have some suggestion?

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import java.awt.event.*;
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