重定义NSLog

.pch中定义

#ifdef TEST_MODE
#define NSLog(...) iydLog(__FILE__, __FUNCTION__, __LINE__, __VA_ARGS__)
#endif

调用和NSLog完全一样

实现：

//
//  iydLogWithFile.m
//  ebook
//
//  Created by xiejinniu on 12-7-3.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//


#import "iydLogWithFile.h"
#include <sys/stat.h>
#import "systemhelper.h"
#import "ebookAppDelegate.h"


#define KLOG_FILE_MAX_SIZE (5*1024*1024)


static void checkLogFileSizeAndDelete()
{
    struct stat fileStatus = {0};
    const char* logPath = [[SystemHelper GetIYDFileLogPath_str] cStringUsingEncoding:NSUTF8StringEncoding];
    if(stat(logPath, &fileStatus) == -1)
    {
        return;
    }
    
    if (fileStatus.st_size > KLOG_FILE_MAX_SIZE) 
    {
        [[NSFileManager defaultManager] removeItemAtPath:[SystemHelper GetIYDFileLogPath_str] error:nil];
    }
}


void iydLog(const char* file, const char* function, int line, NSString* format, ...)
{
	[[ebookAppDelegate getInstance].logLock lock];


	{
        checkLogFileSizeAndDelete();
        
        va_list args;
        va_start(args, format);
        
        NSMutableString* strContent = [[NSMutableString alloc] initWithFormat:format
                                                                    arguments:args];
        [strContent appendFormat:@"\r\n[file:%s], [function:%s], [line:%d]\r\n\r\n", file, function, line];
        
        NSLogv(format, args);


        const char* cLog = [strContent cStringUsingEncoding:NSUTF8StringEncoding];


        const char* logPath = [[SystemHelper GetIYDFileLogPath_str] cStringUsingEncoding:NSUTF8StringEncoding];


        FILE* filehandle = fopen(logPath, "ab+");
        if (filehandle != NULL) 
        {
            int realsize = fwrite(cLog, 1, strlen(cLog), filehandle);
            if (realsize != strlen(cLog)) 
            {
                NSLogv(@"write log file error!", nil);
            }
        }
        fclose(filehandle);
        
        [strContent release];
        va_end(args);
    }
	
	[[ebookAppDelegate getInstance].logLock unlock];
}