如何控制工程中的LOG信息，并写入文件

//

02	//  TFLog.h

03

//

04	//  Created by Tom Fewster on 08/06/2010.

05

//

06

07	#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR

08	#   import <UIKit/UIKit.h>

09

#else

10	#   import <Cocoa/Cocoa.h>

11

#endif

12

13	#ifdef DEBUG

14	#   define DebugLog(format, ...) NSLog(@"<Debug>: " format @" [" __FILE__ @":%i]", ##__VA_ARGS__, __LINE__)

15	#   ifdef TRACE_LOG

16	#       define DebugTrace(format, ...) NSLog(@"<Trace>: " format @" [" __FILE__ @":%i]", ##__VA_ARGS__, __LINE__)

17

#   else

18	#       define DebugTrace(format, ...)

19

#   endif

20	#   define InfoLog(format, ...) NSLog(@"<Info> " format @" [" __FILE__ @":%i]", ##__VA_ARGS__, __LINE__)

21	#   define WarningLog(format, ...) NSLog(@"<Warning> " format @" [" __FILE__ @":%i]", ##__VA_ARGS__, __LINE__)

22	#   define ErrorLog(format, ...) NSLog(@"<Error> " format @" [" __FILE__ @":%i]", ##__VA_ARGS__, __LINE__)

23

#else

24	#   define DebugLog(format, ...)

25	#   define DebugTrace(format, ...)

26	#   define InfoLog(format, ...) NSLog(@"<Info>: " format, ##__VA_ARGS__)

27	#   define WarningLog(format, ...) NSLog(@"<Warning>: " format, ##__VA_ARGS__)

28	#   define ErrorLog(format, ...) NSLog(@"<Error>: " format, ##__VA_ARGS__)

29

#endif

30

31	void initialiseLogger(void);

 

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01

//

02	//  TFLog.m

03

//

04	//  Created by Tom Fewster on 06/04/2012.

05

//

06

07	#import "TFLog.h"

08	#include <assert.h>

09	#include <stdbool.h>

10	#include <sys/types.h>

11	#include <unistd.h>

12	#include <sys/sysctl.h>

13

14	void initialiseLogger(void) {

15	#ifdef DEBUG

16	int                 junk;

17	int                 mib[4];

18	struct kinfo_proc   info;

19	size_t              size;

20

21	// Initialize the flags so that, if sysctl fails for some bizarre

22	// reason, we get a predictable result.

23

24	info.kp_proc.p_flag = 0;

25

26	// Initialize mib, which tells sysctl the info we want, in this case

27	// we're looking for information about a specific process ID.

28

29	mib[0] = CTL_KERN;

30	mib[1] = KERN_PROC;

31	mib[2] = KERN_PROC_PID;

32	mib[3] = getpid();

33

34	// Call sysctl.

35

36	size = sizeof(info);

37	junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);

38	assert(junk == 0);

39

40	// We're being debugged if the P_TRACED flag is set.

41	// so, if we are being debugged the out put will go to Xcode's console

42	// other wise redirect it to a file in our documents directory

43	if (!((info.kp_proc.p_flag & P_TRACED) != 0)) {

44	// find our applications documents directory

45	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

46	NSString *documentsDirectory = [paths objectAtIndex:0];

47

48	// create a unique files name keyed off the date

49	NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

50	[dateFormatter setDateFormat:@"yyyyMMddHHmmss"];

51	NSString *fileName = [NSString stringWithFormat:@"%@.log", [dateFormatter stringFromDate:[NSDate date]]];

52	NSString *logFilePath = [documentsDirectory stringByAppendingPathComponent:fileName];

53

54	// redirect stderr to our new file

55	freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);

56

}

57

#endif

58

}