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><A
NAME="LIBPQ-CONTROL"
>31.10. Control Functions</A
></H1
><P
> These functions control miscellaneous details of <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s
behavior.
</P
><P
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><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
NAME="LIBPQ-PQCLIENTENCODING"
></A
><CODE
CLASS="FUNCTION"
>PQclientEncoding</CODE
>
</DT
><DD
><P
> Returns the client encoding.
</P><PRE
CLASS="SYNOPSIS"
>int PQclientEncoding(const PGconn *<TT
CLASS="REPLACEABLE"
><I
>conn</I
></TT
>);</PRE
><P>
Note that it returns the encoding ID, not a symbolic string
such as <TT
CLASS="LITERAL"
>EUC_JP</TT
>. To convert an encoding ID to an encoding name, you
can use:
</P><PRE
CLASS="SYNOPSIS"
>char *pg_encoding_to_char(int <TT
CLASS="REPLACEABLE"
><I
>encoding_id</I
></TT
>);</PRE
><P>
</P
></DD
><DT
><A
NAME="LIBPQ-PQSETCLIENTENCODING"
></A
><CODE
CLASS="FUNCTION"
>PQsetClientEncoding</CODE
>
</DT
><DD
><P
> Sets the client encoding.
</P><PRE
CLASS="SYNOPSIS"
>int PQsetClientEncoding(PGconn *<TT
CLASS="REPLACEABLE"
><I
>conn</I
></TT
>, const char *<TT
CLASS="REPLACEABLE"
><I
>encoding</I
></TT
>);</PRE
><P>
<TT
CLASS="REPLACEABLE"
><I
>conn</I
></TT
> is a connection to the server,
and <TT
CLASS="REPLACEABLE"
><I
>encoding</I
></TT
> is the encoding you want to
use. If the function successfully sets the encoding, it returns 0,
otherwise -1. The current encoding for this connection can be
determined by using <CODE
CLASS="FUNCTION"
>PQclientEncoding</CODE
>.
</P
></DD
><DT
><A
NAME="LIBPQ-PQSETERRORVERBOSITY"
></A
><CODE
CLASS="FUNCTION"
>PQsetErrorVerbosity</CODE
>
</DT
><DD
><P
> Determines the verbosity of messages returned by
<CODE
CLASS="FUNCTION"
>PQerrorMessage</CODE
> and <CODE
CLASS="FUNCTION"
>PQresultErrorMessage</CODE
>.
</P><PRE
CLASS="SYNOPSIS"
>typedef enum
{
PQERRORS_TERSE,
PQERRORS_DEFAULT,
PQERRORS_VERBOSE
} PGVerbosity;
PGVerbosity PQsetErrorVerbosity(PGconn *conn, PGVerbosity verbosity);</PRE
><P>
<CODE
CLASS="FUNCTION"
>PQsetErrorVerbosity</CODE
> sets the verbosity mode, returning
the connection's previous setting. In <I
CLASS="FIRSTTERM"
>TERSE</I
> mode,
returned messages include severity, primary text, and position only;
this will normally fit on a single line. The default mode produces
messages that include the above plus any detail, hint, or context
fields (these might span multiple lines). The <I
CLASS="FIRSTTERM"
>VERBOSE</I
>
mode includes all available fields. Changing the verbosity does not
affect the messages available from already-existing
<TT
CLASS="STRUCTNAME"
>PGresult</TT
> objects, only subsequently-created ones.
</P
></DD
><DT
><A
NAME="LIBPQ-PQTRACE"
></A
><CODE
CLASS="FUNCTION"
>PQtrace</CODE
>
</DT
><DD
><P
> Enables tracing of the client/server communication to a debugging file stream.
</P><PRE
CLASS="SYNOPSIS"
>void PQtrace(PGconn *conn, FILE *stream);</PRE
><P>
</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
> On Windows, if the <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> library and an application are
compiled with different flags, this function call will crash the
application because the internal representation of the <TT
CLASS="LITERAL"
>FILE</TT
>
pointers differ. Specifically, multithreaded/single-threaded,
release/debug, and static/dynamic flags should be the same for the
library and all applications using that library.
</P
></BLOCKQUOTE
></DIV
></DD
><DT
><A
NAME="LIBPQ-PQUNTRACE"
></A
><CODE
CLASS="FUNCTION"
>PQuntrace</CODE
>
</DT
><DD
><P
> Disables tracing started by <CODE
CLASS="FUNCTION"
>PQtrace</CODE
>.
</P><PRE
CLASS="SYNOPSIS"
>void PQuntrace(PGconn *conn);</PRE
><P>
</P
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