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>Chapter 29. <SPAN
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>29.9. Control Functions</A
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><P
>These functions control miscellaneous details of
<SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s behavior.</P
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><DT
><CODE
CLASS="FUNCTION"
>PQsetErrorVerbosity</CODE
><A
NAME="AEN28615"
></A
></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 may 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
><CODE
CLASS="FUNCTION"
>PQtrace</CODE
><A
NAME="AEN28629"
></A
></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
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><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
><CODE
CLASS="FUNCTION"
>PQuntrace</CODE
><A
NAME="AEN28641"
></A
></DT
><DD
><P
>          Disables tracing started by <CODE
CLASS="FUNCTION"
>PQtrace</CODE
>.
</P><PRE
CLASS="SYNOPSIS"
>void PQuntrace(PGconn *conn);</PRE
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>Functions Associated with the <TT
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