Mali GPU User Interface Engine Application Development Guide

Tutorial on the System Classes2.4 Creating a filesystem interfaceYou can use the FileSystem interface to create streams for reading and writing files in the nativeor a virtual file system. Use the System::createFileSystem() function to retrieve a FileSystemobject. As with other System objects, you can use Managed to eliminate the requirement tomanually release the created object.The following steps describe how to create a FileSystem interface:1. Open the main.cpp file from the 03 - Using the FileSystem Interface project.Example 2-11 shows how to create a system and filesystem interface:Example 2-11 Create a System object#include #include int main(){try{MDE::Managed system = MDE::create_system_backend();Managed filesystem = system->createFileSystem(".");...The parameter passed to createFileSystem() specifies the root directory.2. Example 2-12 shows how to use the filesystem to attempt to read a file. For this example,the target file does not exist, and the exception is trapped.Example 2-12 Create an InputStream object...printf("Trying to load a non-existent file:\n");try{Managed nonexisting = filesystem->createInputStream("data/non-existing-file.txt");}catch(IOException& ioe){printf("An expected exception was thrown:\n%s\n", ioe.getMessage().getCharString() );}...3. Example 2-13 shows how to create two streams and read the contents of a file:Example 2-13 Reading from a file...Managed output = filesystem->createOutputStream("data/write.txt");Managed input = filesystem->createInputStream("data/read.txt");int length = input->getLength();// Allocate the size of the file, plus one extra byte for a null-terminatorchar* inputBuffer = new char[length+1];ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 2-9ID070710Non-Confidential - Draft - Beta