help with libpq program

folks

i need help with libpq program ,i made on C program
for
wrapper libpq.dll program , the routine failing is
copy from stdin interface.

PQputCopyData return 1 (AKA ok)
PQputCopyEnd return 1 (AKA ok)
but nothing is append to database.
tailing log file

invalid input syntax for integer: "3 hello world
4.5
"
CONTEXT: COPY foo, line 1, column a: "3 hello
world 4.5
"
STATEMENT: copy foo from stdin

data seems to be correct
"3\ hello world \ 4.5\n"
"\\.\n"

database ( is for one example found at google)
create table foo (a int4, b char(16), d float8);
copy foo from stdin;

"3\ hello world \ 4.5\n"
"\\.\n"

I'm wrong?

what is way to diagnose?
any sugestion are welcomed
best regards

MDC

PD: any example are welcomed too.

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