[NOVICE] get error message of COPY command after using PQputCopyEnd

I'm trying to get an error after sending wrong buffer by PQputCopyData.
I do everything according to the documentation:
PGconn* conn=PQconnectdb(qPrintable(conninfo));

    if (PQstatus(conn) != CONNECTION_OK)
    {
        ...
    }
    PQsetClientEncoding(conn,"WIN1251");
    PGresult* res=PQexec(conn,"COPY ksv FROM STDIN);
    ExecStatusType status= PQresultStatus(res);
    PQclear(res);
    if(status!=PGRES_COPY_IN)
    {
       ...
    }
    int
copyStatus=PQputCopyData(conn,bufferToWrite,strlen(bufferToWrite));//
bufferToWrite is wrong
    cout()<<copyStatus; // returns 1
    const char* error=NULL;
    int copyStatusEnd=PQputCopyEnd(conn,error);

    cout()<<copyStatusEnd;// returns 1
    if(error!=NULL) // error is NULL
    {
       ...
    }
     PGresult* result=PQgetResult(conn); // so, here im calling pqgetresult
to get error
     ExecStatusType status2= PQresultStatus(result);
     if(status2==PGRES_COMMAND_OK) // and status2 is really PGRES_COMMAND_OK
    {
       ...
    }
 char * error1= PQresultErrorMessage(result);
    cout()<<error1; // here null
    char* error2 =PQerrorMessage(conn);
    cout()<<error2; // here null


so, pqgetresult do not return any error. what im doing wrong?




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