<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML> <HEAD> <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9"> <TITLE> {The S-lang C Library Reference}: SLang_verror</TITLE> <LINK HREF="cref-83.html" REL=next> <LINK HREF="cref-81.html" REL=previous> <LINK HREF="cref.html#toc82" REL=contents> </HEAD> <BODY> <A HREF="cref-83.html">Next</A> <A HREF="cref-81.html">Previous</A> <A HREF="cref.html#toc82">Contents</A> <HR> <H2><A NAME="SLang_verror"></A> <A NAME="s82">82. <B>SLang_verror</B></A></H2> <P> <DL> <DT><B> Synopsis </B><DD><P>Signal an error with a message <DT><B> Usage </B><DD><P><CODE>void SLang_verror (int code, char *fmt, ...);</CODE> <DT><B> Description </B><DD><P>The <CODE>SLang_verror</CODE> function sets <CODE>SLang_Error</CODE> to <CODE>code</CODE> if <CODE>SLang_Error</CODE> is 0. It also displays the error message implied by the <CODE>printf</CODE> variable argument list using <CODE>fmt</CODE> as the format. <DT><B> Example </B><DD><P> <BLOCKQUOTE><CODE> <PRE> FILE *open_file (char *file) { char *file = "my_file.dat"; if (NULL == (fp = fopen (file, "w"))) SLang_verror (SL_INTRINSIC_ERROR, "Unable to open %s", file); return fp; } </PRE> </CODE></BLOCKQUOTE> <DT><B> See Also </B><DD><P><CODE>SLang_vmessage, SLang_exit_error</CODE> </DL> <P> <P> <P> <HR> <A HREF="cref-83.html">Next</A> <A HREF="cref-81.html">Previous</A> <A HREF="cref.html#toc82">Contents</A> </BODY> </HTML>