TB10.1 Example Applications: examples/PIPS/FileAccessExample/fileaccessexample.c Source File

00001 // fileaccessexample.c
-00002 //
-00003 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
-00004 // All rights reserved.
-00005 // This component and the accompanying materials are made available
-00006 // under the terms of "Eclipse Public License v1.0"
-00007 // which accompanies this distribution, and is available
-00008 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
-00009 //
-00010 // Initial Contributors:
-00011 // Nokia Corporation - initial contribution.
-00012 //
-00013 // Contributors:
-00014 //
-00015 // Description:
-00016 // Component description file
-00017 //
-00018 
-00019 // This example demonstrates the Symbian platform platform security model.
-00020 // This shows the restrictions on the directories that can be accessed by a program, 
-00021 // depending on the capabilities that the program has.
-00022 
-00023 // Include files
-00024 #include <stdio.h>
-00025 #include <errno.h>
-00026 #include <stdlib.h>
-00027 #include <unistd.h>
-00028 #include <sys/stat.h>
-00029 
-00033 void PressAKey()
-00034         {
-00035         fflush(stdout);
-00036         getchar();
-00037         }
-00042 int DisplayErrorMessage(char msg[])
-00043         {
-00044         printf("%s [Error NUMBER = %d]\n",msg,errno);
-00045         PressAKey();
-00046         return EXIT_FAILURE;
-00047         }
-00052 void CreateASecureDirectory()
-00053         {
-00054         int result;
-00055         
-00061         result = mkdir("mydirectory",S_IWUSR);     
-00062         if(result == 0)
-00063                 {
-00064                 printf(" A secure directory for the program is created successfully\n");
-00065                 PressAKey();
-00066                 }
-00067         else
-00068                 {
-00069                 DisplayErrorMessage("\nError in creating directory\n");
-00070                 PressAKey();
-00071                 }
-00072         }
-00077 void WriteDataToAFile(char FileName[])
-00078         {
-00079         FILE* fp= NULL;
-00080         
-00086         fp = fopen(FileName, "w");
-00087         if (fp== NULL)
-00088                 {
-00089                 DisplayErrorMessage("\nError in writing data in to the file=%d");
-00090                 PressAKey();
-00091                 }
-00092         else
-00093                 {
-00094                 fprintf(fp,"%s","hello");
-00095                 fflush(fp);
-00096                 fclose(fp);
-00097                 printf(" Writing data in to the file from the secure directory is successful");
-00098                 }
-00099         }
-00100 
-00105 void ReadDataFromAFile(char FileName[])
-00106         {
-00107         FILE* fp= NULL;
-00108         
-00114         fp = fopen(FileName, "r");
-00115         if (fp == NULL)
-00116                 {
-00117         DisplayErrorMessage("\nError in reading data from the file = %d"); 
-00118         printf(" Press any key to exit from the example");
-00119         PressAKey();
-00120                 }
-00121         else
-00122                 {
-00123                 char x[30];
-00124                                 
-00125                 // Seek to the beginning of the file
-00126         fseek(fp, SEEK_SET, 0); 
-00127         
-00128         // Get the data present in file from the beginning 
-00129                 fscanf(fp,"%s",x);
-00130                 printf("\n Data present in the file is : %s",x);
-00131                 fclose(fp);
-00132                 printf("\n Reading data of the file from the directory is successful\n");
-00133                 }
-00134         }
-00139 void RemoveADirectory(char FileName[])
-00140         {
-00141         int result;
-00142         
-00148         result = remove(FileName);
-00149         if(result == 0)
-00150                         {
-00151                         printf(" Removing the file from the directory is successful\n");
-00152                         }
-00153                 else
-00154                         {
-00155                         DisplayErrorMessage(" Error in removing the file from the directory=%d");
-00156                         PressAKey();
-00157                         }
-00163         result = rmdir("mydirectory");
-00164    
-00165         if(result == 0)
-00166                 {
-00167                 printf(" Removing the the directory is successful\n");
-00168                 PressAKey();
-00169                 }
-00170         else
-00171                 {
-00172                 DisplayErrorMessage(" Error in removing the directory=%d");
-00173                 PressAKey();
-00174                 }
-00175         }
-00180 void WriteDataToFileOfAnotherProgram(char FileName[])
-00181         {
-00182         FILE* fp= NULL;
-00183         
-00189         fp = fopen(FileName, "w");
-00190         
-00191         if (fp == NULL)
-00192                 {
-00193                 printf(" Writing data to files in a private directory belonging to another program is not possible"); 
-00194         }
-00195         else
-00196                 {
-00197                 printf("\n Writing data to files in a private directory belonging to another program is possible"); 
-00198                 PressAKey();
-00199                 }
-00200         }
-00205 void ReadDataFromFileOfAnotherProgram(char FileName[])
-00206         {
-00207         FILE* fp= NULL;
-00208         
-00214         fp = fopen(FileName, "r");
-00215         
-00216         if (fp == NULL)
-00217                 {
-00218                 printf("\n Reading data from files in a private directory belonging to another program is not possible"); 
-00219                 PressAKey();
-00220                 }
-00221         else
-00222                 {
-00223                 printf("\n Reading data from files in a private directory belonging to another program is possible"); 
-00224                 PressAKey(); 
-00225                 }
-00226         }
-00231 void WriteDataToFileOfSysBin(char FileName[])
-00232         {
-00233         FILE* fp= NULL;
-00234         
-00240         fp = fopen(FileName, "w");
-00241         
-00242         if (fp == NULL)
-00243                 {
-00244                 printf("\n Writing data to files in the sys/bin directory is not possible"); 
-00245                 }
-00246         else
-00247                 {
-00248                 printf("\n Writing data to files in the sys/bin directory is possible"); 
-00249                 PressAKey();
-00250                 }
-00251         }
-00256 void ReadDataToFileOfSysBin(char FileName[])
-00257         {
-00258         FILE* fp = NULL;
-00259         
-00265         fp = fopen(FileName, "r");
-00266         
-00267         if (fp == NULL)
-00268                 {
-00269                 printf("\n Reading data from files in the sys/bin directory is not possible"); 
-00270                 PressAKey();
-00271                 }
-00272         else
-00273                 {
-00274                 printf("\n Reading data from files in the sys/bin directory is possible"); 
-00275                 printf(" Press any key to exit from the example");
-00276                 PressAKey(); 
-00277                 }       
-00278         }
-00279 
-00280 int main()
-00281 {
-00282         char ownFileName[50] = "\\private\\e80000c9\\mydirectory\\myownfile.txt";
-00283         char otherFileName[40] = "\\private\\e80000c8\\otherfile.txt";
-00284         char sysBinFileName[30] = "\\sys\\bin\\euser.dll";
-00285         
-00286         printf("\n Welcome to the file access example using POSIX APIs\n");
-00287         
-00288         // Print the message to start the example application.
-00289         printf("\n Press enter key to step through the example\n");
-00290         PressAKey();
-00291         
-00292         // Call CreateASecureDirectory() function to create a secure directory for the program.
-00293         CreateASecureDirectory();
-00294         
-00295         // Call WriteDataToAFile() function to write data in to a file from the created directory.
-00296         WriteDataToAFile(ownFileName);
-00297         
-00298         // Call WriteDataToAFile() function to write data in to a file from the created directory.
-00299         ReadDataFromAFile(ownFileName);
-00300         
-00301         // Call RemoveADirectory() function to remove the directory.
-00302         RemoveADirectory(ownFileName);
-00303         
-00304         // Call WriteDataToFileOfAnotherProgram() function to write data in to a file of another program.
-00305         WriteDataToFileOfAnotherProgram(otherFileName);
-00306         
-00307         // Call ReadDataFromFileOfAnotherProgram() function to read data from a file of another program.
-00308         ReadDataFromFileOfAnotherProgram(otherFileName);
-00309         
-00310         // Call WriteDataToFileOfSysBin() function to write data in to a file of sys/bin directory.
-00311         WriteDataToFileOfSysBin(sysBinFileName);
-00312         
-00313         // Call ReadDataFromFileOfSysBin() function to read data from a file in the sys/bin directory.
-00314         ReadDataToFileOfSysBin(sysBinFileName);
-00315         
-00316         // Print the message to exit from the example application.
-00317         printf("\n Press enter key to exit from the example application");
-00318         PressAKey();
-00319         
-00320         // returns the success code.
-00321         return EXIT_SUCCESS;
-00322 }
-00323 
-00324 
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