JNI: vfprintf hook

[anton muhin]

Hello, gurus!

Old JNI faq (http://java.sun.com/products/jdk/faq/jnifaq-old.html) says:

Note that System.err and System.out are not redirected by the vfprintf
hook. You may call the appropriate Java methods in the System class to
redirect these two Java streams.

If I read it correctly I should use System.setErr and System.setOut
methods, but which object I should pass in?

with the best regards,
anton.

 

[Gordon Beaton]

Old JNI faq (http://java.sun.com/products/jdk/faq/jnifaq-old.html) says:

Note that System.err and System.out are not redirected by the
vfprintf hook. You may call the appropriate Java methods in the
System class to redirect these two Java streams.

If I read it correctly I should use System.setErr and System.setOut
methods, but which object I should pass in?

Pass any open PrintStream to those methods.

If you want to do the redirection from native code instead (which your
question implies), try freopen(), or replace the underlying descriptor
with a combination of open() and dup2(). Or make calls to
System.setOut() etc from the native code.

/gordon

 

[anton muhin]

Pass any open PrintStream to those methods.

If you want to do the redirection from native code instead (which your
question implies), try freopen(), or replace the underlying descriptor
with a combination of open() and dup2(). Or make calls to
System.setOut() etc from the native code.

/gordon

Thank you!

with the best regards,
anton.