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>Chapter 3. <SPAN
CLASS="APPLICATION"
>pgtcl</SPAN
> - Tcl Binding Library</TD
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><H1
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><A
NAME="LIBPGTCL-LOADING"
>3.2. Loading <SPAN
CLASS="APPLICATION"
>pgtcl</SPAN
> into your application</A
></H1
><P
> Before using <SPAN
CLASS="APPLICATION"
>pgtcl</SPAN
> commands, you must load
<TT
CLASS="FILENAME"
>libpgtcl</TT
> into your Tcl application. This is normally
done with the Tcl <TT
CLASS="LITERAL"
>load</TT
> command. Here is an example:
</P><PRE
CLASS="PROGRAMLISTING"
>load libpgtcl[info sharedlibextension]</PRE
><P>
The use of <TT
CLASS="LITERAL"
>info sharedlibextension</TT
> is recommended in
preference to hard-wiring <TT
CLASS="LITERAL"
>.so</TT
> or <TT
CLASS="LITERAL"
>.sl</TT
> into
the program.
</P
><P
> The <TT
CLASS="LITERAL"
>load</TT
> command will fail unless the system's dynamic
loader knows where to look for the <TT
CLASS="FILENAME"
>libpgtcl</TT
> shared
library file. You may need to work with <TT
CLASS="COMMAND"
>ldconfig</TT
>, or
set the environment variable <TT
CLASS="ENVAR"
>LD_LIBRARY_PATH</TT
>, or use
some equivalent facility for your platform to make it work. Refer
to the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> installation instructions for
more information.
</P
><P
> <TT
CLASS="FILENAME"
>libpgtcl</TT
> in turn depends on <TT
CLASS="FILENAME"
>libpq</TT
>, so the
dynamic loader must also be able to find the <TT
CLASS="FILENAME"
>libpq</TT
> shared
library. In practice this is seldom an issue, since both of these
shared libraries are normally stored in the same directory, but it
can be a stumbling block in some configurations.
</P
><P
> If you use a custom executable for your application, you might choose
to statically bind <TT
CLASS="FILENAME"
>libpgtcl</TT
> into the executable and thereby
avoid the <TT
CLASS="LITERAL"
>load</TT
> command and the potential problems of dynamic
linking. See the source code for <SPAN
CLASS="APPLICATION"
>pgtclsh</SPAN
> for an example.
</P
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