File input/output: Difference between revisions
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(Idiomatic example.) |
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[[Category:GNU Compiler Collection]] |
[[Category:GNU Compiler Collection]] |
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Many objects know how to create an instance from a file or write an instance to file. In this example, a dictionary write itself to a file using XML property list format, and then read back into a new instance. |
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There are various classes in Objective C for opening, reading, and writing files. One way is with the NSFileManager class for reading, and a NSFileHandle for writing. |
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NSDictionary *info = [NSDicionary dictionaryWithObjectsAndKeys: |
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NSString *inputPath = @"input.txt"; |
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@"name", @"Joe", |
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NSString *outputPath = @"output.txt"; |
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@"age", [NSNumber numberWithUnsignedInt:37], |
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nil]; |
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if( [[NSFileManager defaultManager] isReadableFileAtPath:inputPath] ){ |
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NSData *data = [[NSFileManager defaultManager] contentsAtPath:inputPath]; |
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[info writeToFile:@"/tmp/test.plist" atomically:YES]; |
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[[NSFileManager defaultManager] createFileAtPath:outputPath contents:data attributes:nil]; |
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NSDictionary *saved = [NSDictionary dictionaryWithContentsOfFile:@"/tmp/test.plist"]; |
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} else { |
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NSLog( @"No such file." ); |
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There are many other methods to read and write files, accessing file attributes etc. |
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} |
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==[[Perl]]== |
==[[Perl]]== |
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