Data commit

Task/Read-entire-file/Objective-C/read-entire-file.m

@@ -0,0 +1,32 @@
+    /*** 0. PREPARATION    */
+    // We need a text file to read; let's redirect a C string to a new file
+    // using the shell by way of the stdlib system() function.
+    system ("echo \"Hello, World!\" > ~/HelloRosetta");
+
+
+
+    /*** 1. THE TASK      */
+    // Instantiate an NSString which describes the filesystem location of
+    // the file we will be reading.
+    NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:@"HelloRosetta"];
+
+    // The selector we're going to use to complete this task,
+    // stringWithContentsOfFile:encoding:error, has an optional `error'
+    // parameter which can be used to return information about any
+    // errors it might run into. It's optional, but we'll create an NSError
+    // anyways to demonstrate best practice.
+    NSError *anError;
+
+    // And finally, the task: read and store the contents of a file as an
+    // NSString.
+    NSString *aString = [NSString stringWithContentsOfFile:filePath
+                                                  encoding:NSUTF8StringEncoding
+                                                     error:&anError];
+
+    // If the file read was unsuccessful, display the error description.
+    // Otherwise, display the NSString.
+    if (!aString) {
+        NSLog(@"%@", [anError localizedDescription]);
+    } else {
+        NSLog(@"%@", aString);
+    }