Symbian3/SDK/Source/GUID-9D871368-ADB9-5588-A1F3-39A432F4F32E.dita
changeset 7 51a74ef9ed63
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-9D871368-ADB9-5588-A1F3-39A432F4F32E.dita	Wed Mar 31 11:11:55 2010 +0100
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-9D871368-ADB9-5588-A1F3-39A432F4F32E" xml:lang="en"><title>Command
+Line Parsing </title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>Command Line Parsing provides access to arguments passed on the command-line. </p>
+<p>Conventional C and C++ programs receive their arguments from <codeph>main(
+        int argc, char* argv[] )</codeph>. On the Symbian platform,
+programs are invoked through an <codeph>E32Main()</codeph> function taking
+no arguments. Most Symbian programs are launched through a graphical shell
+rather than through a command-line. The common exceptions are <filepath>.exe</filepath> s
+on the PC platform, which can be run from a Windows command prompt. </p>
+<p>For <filepath>.exe</filepath> programs, control is received through the <codeph>E32Main()</codeph> function,
+which does not supply arguments. Instead, access to arguments is provided
+by <xref href="GUID-CE114EA5-A084-39A5-9F48-14344AB5BDBA.dita"><apiname>CCommandLineArguments</apiname></xref>. This class is not intended primarily
+for code running on a Symbian phone. Its main use is in parsing the arguments
+of WINC command-line utilities. </p>
+<p>For a program that is launched as a new process, the arguments are available
+as part of the process command line and may be obtained in full using code
+as the following: </p>
+<codeblock id="GUID-CA0EBC3E-1FB5-5E39-8790-DE3131DB1B77" xml:space="preserve">TInt argLen = User::CommandLineLength();
+HBufC16* hBuf = HBufC::NewL( argLen );
+TPtr tPtr = hBuf-&gt;Des();
+User::CommandLine( tPtr );</codeblock>
+<p>However, the arguments are in a raw form. For convenience, the <codeph>CCommandLineArguments</codeph> class
+provides functions to access the program name as argument 0, and each command-line
+argument as argument 1, 2 etc. Arguments beginning with a quote may contain
+blanks and doubled quotes. Arguments not beginning with a quote are terminated
+by a blank. </p>
+</conbody></concept>
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