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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