Libpq: copy file to bytea column

Hi!

The data types of tableout.c1 and tablein.c1 are both bytea. I first export tableout.c1 to a file:

db1=# COPY (SELECT c1 FROM tableout LIMIT 1) TO '/tmp/t';

Then I try to import the file to another table.

This works without flaw:

db1=# COPY tablein FROM '/tmp/t';

However, I get the following errors from log when calling libpq functions PQputCopyData() and PQputCopyEnd().

2010-03-06 20:47:42 CST ERROR:  invalid byte sequence for encoding "UTF8": 0x00
2010-03-06 20:47:42 CST HINT:  This error can also happen if the byte sequence does not match the encoding expected by
theserver, which is controlled by "client_encoding". 
2010-03-06 20:47:42 CST CONTEXT:  COPY in, line 1:
"TPF0\011Report\000\003Tag\002\365\016ExportFromPage\002\000\014ExportToPage\002\000\006Values\016..."
2010-03-06 20:47:42 CST STATEMENT:  COPY in FROM STDIN


Helps will be much appreciated!

CN