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| <H2>wcerr</H2> |
| <P><B>Library:</B> <A HREF="2-11.html">Input/output</A></P><UL> |
| <LI><A HREF="#sec1">Local Index</A></LI> |
| <LI><A HREF="#sec2">Summary</A></LI> |
| <LI><A HREF="#sec3">Synopsis</A></LI> |
| <LI><A HREF="#sec4">Description</A></LI> |
| <LI><A HREF="#sec5">Formatting</A></LI> |
| <LI><A HREF="#sec6">Example</A></LI> |
| <LI><A HREF="#sec7">See Also</A></LI> |
| <LI><A HREF="#sec8">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| No Entries |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>A predefined stream that controls output to an unbuffered stream buffer associated with the object <SAMP>stderr</SAMP> declared in <SAMP><cstdio></SAMP></P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <iostream> |
| |
| namespace std { |
| extern wostream wcerr; |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <P>The object <SAMP>wcerr</SAMP> controls output to an unbuffered stream buffer associated with the object <SAMP>stderr</SAMP> declared in <SAMP><cstdio></SAMP>. By default the standard C and C++ streams are synchronized, but you can improve performance by using the <B><I><A HREF="ios-base.html">ios_base</A></I></B> member function <SAMP>synch_with_stdio</SAMP> to desynchronize them. </P> |
| <P><SAMP>wcerr</SAMP> uses the locale <SAMP>codecvt</SAMP> facet to convert the wide characters it receives to the tiny characters it outputs to <SAMP>stderr</SAMP>. </P> |
| <A NAME="sec5"><H3>Formatting</H3></A> |
| <P>The formatting is done through member functions or manipulators. See <B><I><A HREF="cout.html">cout</A></I></B>, <B><I><A HREF="wcout.html">wcout</A></I></B>, or <B><I><A HREF="basic-ostream.html">basic_ostream</A></I></B> for details.</P> |
| <A NAME="sec6"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // wcerr example |
| // |
| #include <iostream> |
| #include <fstream> |
| |
| void main ( ) |
| { |
| using namespace std; |
| |
| // open the file "file_name.txt" |
| // for reading |
| wifstream in("file_name.txt"); |
| |
| // output the all file to stdout |
| if ( in ) |
| wcout << in.rdbuf(); |
| else |
| // if the wifstream object is in a bad state |
| // output an error message to stderr |
| wcerr << L"Error while opening the file" << endl; |
| } |
| </PRE></UL> |
| <A NAME="sec7"><H3>See Also</H3></A> |
| <P><B><I><A HREF="basic-ostream.html">basic_ostream</A></I></B>, <B><I><A HREF="basic-iostream.html">basic_iostream</A></I></B>, <B><I><A HREF="basic-filebuf.html">basic_filebuf</A></I></B>, <B><I><A HREF="cout.html">cout</A></I></B>, <B><I><A HREF="cin.html">cin</A></I></B>, <B><I><A HREF="cerr.html">cerr</A></I></B>, <B><I><A HREF="clog.html">clog</A></I></B>, <B><I><A HREF="wcin.html">wcin</A></I></B>, <B><I><A HREF="wcout.html">wcout</A></I></B>, <B><I><A HREF="wclog.html">wclog</A></I></B>, <B><I><A HREF="ios-base.html">ios_base</A></I></B>, <B><I><A HREF="basic-ios.html">basic_ios</A></I></B></P> |
| <A NAME="sec8"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.3.2</I></P> |
| |
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