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POHow to save a text document in Cocoa with specified NSString encoding?
 

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  1. POHow to save a text document in Cocoa with specified NSString encoding?
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    <p>I'm trying to create a simple text editor like Textedit for Mac OS X, but after many hours of research can't figure out how to correctly write my document's data to a file. I'm using the Cocoa framework and my application is document-based. Looking around in the Cocoa API I found a brief tutorial, "Building a text editor in 15 minutes" or something like this, that implements the following method to write the data to a file:</p> <pre><code>- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError { [textView breakUndoCoalescing]; NSAttributedString *string=[[textView textStorage] copy]; NSData *data; NSMutableDictionary *dict=[NSDictionary dictionaryWithObject:NSPlainTextDocumentType forKey:NSDocumentTypeDocumentAttribute]; data=[string dataFromRange:NSMakeRange(0,[string length]) documentAttributes:dict error:outError]; return data; } </code></pre> <p>This just works fine, but I'd like to let the user choose the text encoding. I guess this method uses an "automatic" encoding, but how can I write the data using a predefined encoding? I tried using the following code:</p> <pre><code>- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError { [textView breakUndoCoalescing]; NSAttributedString *string=[[textView textStorage] copy]; NSData *data; NSInteger saveEncoding=[prefs integerForKey:@"saveEncoding"]; // if the saving encoding is set to "automatic" if (saveEncoding&lt;0) { NSMutableDictionary *dict=[NSDictionary dictionaryWithObject:NSPlainTextDocumentType forKey:NSDocumentTypeDocumentAttribute]; data=[string dataFromRange:NSMakeRange(0,[string length]) documentAttributes:dict error:outError]; // else use the encoding specified by the user } else { NSMutableDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:NSPlainTextDocumentType,NSDocumentTypeDocumentAttribute,saveEncoding,NSCharacterEncodingDocumentAttribute,nil]; data=[string dataFromRange:NSMakeRange(0,[string length]) documentAttributes:dict error:outError]; } return data; } </code></pre> <p>saveEncoding is -1 if the user didn't set a specific encoding, otherwise one of the encodings listed in [NSString availableStringEncodings]. But whenever I try to save my document in a different encoding from UTF8, the app crashes. The same happens when I try to encode my document with the following code:</p> <pre><code>NSString *string=[[textView textStorage] string]; data=[string dataUsingEncoding:saveEncoding]; </code></pre> <p>What am I doing wrong? It would be great if someone knows how Textedit solved this problem.</p>
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