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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-788031A5-75C1-420E-9E2B-71E09FF08ADF" xml:lang="en"><title>Example
using <codeph>E32Main()</codeph></title><shortdesc/><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>A simple example using <codeph>E32Main()</codeph> as an entry point is
described below. The example writes a text to a file. </p>
<ul>
<li><p>Modify the MMP file as mentioned earlier.</p></li>
<li><p>Create a trap handler using <xref href="GUID-17AC7BAD-1C03-3729-BCC6-F5B28B32E99D.dita"><apiname>CTrapCleanup</apiname></xref>.</p></li>
<li><p>Call the method within <codeph>TRAPD</codeph>.</p></li>
<li><p>Delete the trap handler. </p></li>
</ul>
<codeblock xml:space="preserve">#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
#include &lt;e32base.h&gt;

void doExampleL(void)
{
    FILE* fd;
    char* fileName = "C:\\test.txt";
    char *buf = "Hello world from E32Main()";
    fd = fopen(fileName, "w");
    if (fd == NULL)
    {
        printf("Unable to open the file (%s)", fileName);
        return;
    }
    if (fwrite(buf, sizeof(char), strlen(buf), fd) &lt; 0 )
    {
        perror("write fails.");
    }
    fclose(fd);
}

GLDEF_C TInt E32Main()
    {
    CTrapCleanup* cleanup=CTrapCleanup::New();
    TRAPD(error,doExampleL());
    delete cleanup; // destroy cleanup stack
    return 0; // and return
    }
</codeblock>
</conbody></concept>