1 <?xml version="1.0" encoding="utf-8"?>

     2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

     3 <!-- This component and the accompanying materials are made available under the terms of the License 

     4 "Eclipse Public License v1.0" which accompanies this distribution, 

     5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

     6 <!-- Initial Contributors:

     7     Nokia Corporation - initial contribution.

     8 Contributors: 

     9 -->

    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-063020E5-51C0-45C3-8B8B-015385FA0928" xml:lang="en"><title>Redirect

    13 Printf Example</title><shortdesc>Redirect standard I/O to a file</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>This example illustrates how to redirect standard I/O to a file. The <codeph>libc</codeph> library

    15 provides <xref href="GUID-6A17B64B-44DC-33F0-B18A-25004500C831.dita"><apiname>freopen()</apiname></xref> API to redirect all standard IOs (namely

    16 - stderr, stdin or stdout). Application first prints launching information

    17 at the console and then opens one file to redirect standard output using <xref href="GUID-6A17B64B-44DC-33F0-B18A-25004500C831.dita"><apiname>freopen()</apiname></xref>.

    18 Calling <xref href="GUID-6A17B64B-44DC-33F0-B18A-25004500C831.dita"><apiname>freopen()</apiname></xref> once more, the user can change the filename

    19 during execution. This helps to redirect application <xref href="GUID-919E1C29-029A-38E2-B844-141A6E02ADA2.dita"><apiname>printf()</apiname></xref> messages

    20 into a log file. </p>

    21 <section id="GUID-026FD8D6-6C4A-5958-B289-775D4AE1E756-GENID-1-10-1-12-1-1-5-1-3-1-11-1-16-1-3-2"><title>Download</title> <p>Click

    22 on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-b83a4952-b5e5-4ef5-a1c9-ee48705964a1.zip" scope="external">redirectprintf.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-b83a4952-b5e5-4ef5-a1c9-ee48705964a1.html" scope="peer">browse</xref> to view the example code. </p> </section>

    23 <section id="GUID-7E7C4564-B10E-41F9-8A9D-D8A6C5E9C51C-GENID-1-10-1-12-1-1-5-1-3-1-11-1-16-1-3-3"><title>Design and

    24 Implementation</title> <p>The following sections provide information about

    25 the implementation of the example. </p> <p><b>Capabilities</b> </p>The program

    26 capabilities are defined in <filepath>redirectprintf.mmp</filepath> : <codeph>CAPABILITY

    27 NONE</codeph>. </section>

    28 <section id="GUID-67A72761-1D92-46D1-B1C9-7455978BDE4E-GENID-1-10-1-12-1-1-5-1-3-1-11-1-16-1-3-4"><title>Building and

    29 Using</title> To build the example application, go to the redirectprintf\group

    30 directory and build the application.  The definition for the whole application

    31 can be found in the bld.inf file in the group subdirectory of the applications

    32 main directory.<p>The application is simple console based application. It

    33 has its own default icon and can be launched from the UI both

    34 in the emulator and in the device.  The application can be launched by: Executing

    35 redirectprintf from eshell.  Clicking default icon with display text redirectprintf

    36 within the install folder launcher application. </p> </section>

    37 </conbody></concept>