blocks|key|1716786|text|我已经成功地使用了freopen(...)将输出重定向到我自己的文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1716787|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I've successfully used freopen(...) on the phone to re-direct output to my own file.

blocks|key|1716820|text|如果你想使用Cocoa，NSString和NSData提供了读/写文件的方法，而NSFileManager提供了文件操作。下面是一个例子(应该适用于iPhone)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1716821|NSData+*dataToWrite+=+[[NSString+stringWithString:@"String+to+write"]+dataUsingEncoding:NSUTF8StringEncoding];

NSString+*docsDirectory+=+[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,+NSUserDomainMask,+YES)+objectAtIndex:0];
NSString+*path+=+[docsDirectory+stringByAppendingPathComponent:@"fileName.txt"];

//+Write+the+file
[dataToWrite+writeToFile:path+atomically:YES];

//+Read+the+file
NSString+*stringFromFile+=+[[NSString+alloc]+initWithContentsOfFile:path];++

//+Check+if+file+exists
NSFileManager+*fileManager+=+[NSFileManager+defaultManager];
[fileManager+fileExistsAtPath:path];+//+Returns+a+BOOL++++

//+Remove+the+file
[fileManager+removeItemAtPath:path+error:NULL];

//+Cleanup
[stringFromFile+release];
[fileManager+release];|code-block|syntax|javascript|1716822|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to use Cocoa, NSString and NSData have methods for reading/writing to file and NSFileManager gives you file operations. Here's an example (should work on iPhone):

<pre><code>NSData *dataToWrite = [[NSString stringWithString:@"String to write"] dataUsingEncoding:NSUTF8StringEncoding];

NSString *docsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *path = [docsDirectory stringByAppendingPathComponent:@"fileName.txt"];

// Write the file
[dataToWrite writeToFile:path atomically:YES];

// Read the file
NSString *stringFromFile = [[NSString alloc] initWithContentsOfFile:path]; 

// Check if file exists
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager fileExistsAtPath:path]; // Returns a BOOL 

// Remove the file
[fileManager removeItemAtPath:path error:NULL];

// Cleanup
[stringFromFile release];
[fileManager release];
</code></pre>

blocks|key|1501762|text|下面的代码适用于我：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1501763|-+(void)applicationDidFinishLaunching:(UIApplication+*)application+{
#if+TARGET_IPHONE_SIMULATOR+==+0
++++freopen([@"/tmp/my_logs.txt"+fileSystemRepresentation],+"w",+stderr);
#endif
}|code-block|syntax|javascript|1501764|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code works for me:

<pre><code>- (void)applicationDidFinishLaunching:(UIApplication *)application {
#if TARGET_IPHONE_SIMULATOR == 0
 freopen([@"/tmp/my_logs.txt" fileSystemRepresentation], "w", stderr);
#endif
}
</code></pre>

blocks|key|1501807|text|这段代码很适合我..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1501808|#if+TARGET_IPHONE_SIMULATOR+==+0
++++NSArray+*paths+=+NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,+NSUserDomainMask,+YES);
++++NSString+*documentsDirectory+=+[paths+objectAtIndex:0];
++++NSString+*logPath+=+[documentsDirectory+stringByAppendingPathComponent:@"console.log"];
++++freopen([logPath+cStringUsingEncoding:NSASCIIStringEncoding],"a%2B",stderr);
#endif|code-block|syntax|javascript|1501809|然后，您可以使用这里介绍的http://blog.coriolis.ch/2009/01/09/redirect-nslog-to-a-file-on-the-iphone/#more-85方法从iphone上获取日志文件。|offset|length|1501810|请注意，使用freopen将使XCODE中的控制台停止工作。然而，由于某些原因，你可以在xcode的组织者中查看的控制台仍然工作得很好。|1501811|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.coriolis.ch/2009/01/09/redirect-nslog-to-a-file-on-the-iphone/#more-85^0|0|0|D|2A|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

This code works great for me..

<pre><code>#if TARGET_IPHONE_SIMULATOR == 0
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentsDirectory = [paths objectAtIndex:0];
 NSString *logPath = [documentsDirectory stringByAppendingPathComponent:@"console.log"];
 freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);
#endif
</code></pre>

You can then get the log file off the iphone using the method outlined here <a href="http://blog.coriolis.ch/2009/01/09/redirect-nslog-to-a-file-on-the-iphone/#more-85" rel="nofollow noreferrer">http://blog.coriolis.ch/2009/01/09/redirect-nslog-to-a-file-on-the-iphone/#more-85</a>

Note that using freopen will STOP THE CONSOLE IN XCODE working.. however, for some reason the console you can view in xcode's organiser still works great.

blocks|key|1716919|text|考虑使用Cocoa+Lumberjack。它是一个轻量级但灵活的实用工具，可以替代NSLog功能。在我看来，它与Log4J属于同一类，允许自定义附加器等。例如，它有一个SQLite记录器。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1716920|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/robbiehanson/CocoaLumberjack^0|4|G|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Consider using <a href="https://github.com/robbiehanson/CocoaLumberjack" rel="nofollow">Cocoa Lumberjack</a>. It's a light but flexible utility to replace NSLog functionality. In my opinion it's in the same class as Log4J, allowing for custom appenders and the like. It has an SQLite logger, for example.

What would be the best way to write log statements to a file or database in an iPhone application?

Ideally, NSLog() output could be redirected to a file using freopen(), but I've seen several reports that it doesn't work. Does anyone have this going already or have any ideas how this might best be done?

Thanks!

Logging to a file on the iPhone

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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将日志语句写入iPhone应用程序中的文件或数据库的最佳方法是什么？理想情况下，可以使用freopen()将NSLog()输出重定向到一个文件，但是我看到一些报告说它不起作用。有没有人已经这样做了，或者有任何想法可以最好地做到这一点？谢谢!

问记录到iPhone上的文件
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