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不及格的程序员-八神

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公告

虽然大家都不愿意看到程序崩溃,但可能崩溃是每个应用必须面对的现实,既然崩溃已经发生,无法阻挡了,那我们就让它崩也崩得淡定点吧。

IOS SDK中提供了一个现成的函数 NSSetUncaughtExceptionHandler 用来做异常处理,但功能非常有限,而引起崩溃的大多数原因如:内存访问错误,重复释放等错误就无能为力了,因为这种错误它抛出的是Signal,所以必须要专门做Signal处理。首先定义一个UncaughtExceptionHandler类,代码如下:

#import <Foundation/Foundation.h>  
#import <UIKit/UIKit.h>  
  
@interface UncaughtExceptionHandler : NSObject  
{  
    BOOL dismissed;  
}  
+(void) InstallUncaughtExceptionHandler;  
@end  


//利用 NSSetUncaughtExceptionHandler,当程序异常退出的时候,可以先进行处理,然后做一些自定义的动作,比如下面一段代码,就是网上有人写的,直接在发生异常时给某人发送邮件,</span> void UncaughtExceptionHandlers (NSException *exception); #import "UncaughtExceptionHandler.h" #include <libkern/OSAtomic.h> #include <execinfo.h> NSString * const UncaughtExceptionHandlerSignalExceptionName = @"UncaughtExceptionHandlerSignalExceptionName"; NSString * const UncaughtExceptionHandlerSignalKey = @"UncaughtExceptionHandlerSignalKey"; NSString * const UncaughtExceptionHandlerAddressesKey = @"UncaughtExceptionHandlerAddressesKey"; volatile int32_t UncaughtExceptionCount = 0; const int32_t UncaughtExceptionMaximum = 10; const NSInteger UncaughtExceptionHandlerSkipAddressCount = 4; const NSInteger UncaughtExceptionHandlerReportAddressCount = 5; NSString* getAppInfo() { NSString *appInfo = [NSString stringWithFormat:@"App : %@ %@(%@)\nDevice : %@\nOS Version : %@ %@\n", [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleDisplayName"], [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"], [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"], [UIDevice currentDevice].model, [UIDevice currentDevice].systemName, [UIDevice currentDevice].systemVersion]; // [UIDevice currentDevice].uniqueIdentifier]; NSLog(@"Crash!!!! %@", appInfo); return appInfo; } void MySignalHandler(int signal) { int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount); if (exceptionCount > UncaughtExceptionMaximum) { return; } if(signal==11) {//比较坑爹的是 我遇到的一个问题只有iPhone5出现问题 但是我这边测试的没有iPhone5 无法直接log 可能是内存不足 果然 删除几个应用就可以了 所以加了这句 UIAlertView * tip2 = [[UIAlertView alloc]initWithTitle:@"可能原因:key" message:@"内存不足" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil]; [tip2 show]; [tip2 release]; } NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithObject:[NSNumber numberWithInt:signal] forKey:UncaughtExceptionHandlerSignalKey]; NSArray *callStack = [UncaughtExceptionHandler backtrace]; [userInfo setObject:callStack forKey:UncaughtExceptionHandlerAddressesKey]; [[[[UncaughtExceptionHandler alloc] init] autorelease] performSelectorOnMainThread:@selector(handleException:) withObject: [NSException exceptionWithName:UncaughtExceptionHandlerSignalExceptionName reason: [NSString stringWithFormat: NSLocalizedString(@"Signal %d was raised.\n" @"%@", nil), signal, getAppInfo()] userInfo: [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:signal] forKey:UncaughtExceptionHandlerSignalKey]] waitUntilDone:YES]; } @implementation UncaughtExceptionHandler +(void) InstallUncaughtExceptionHandler { signal(SIGABRT, MySignalHandler); signal(SIGILL, MySignalHandler); signal(SIGSEGV, MySignalHandler); signal(SIGFPE, MySignalHandler); signal(SIGBUS, MySignalHandler); signal(SIGPIPE, MySignalHandler); } + (NSArray *)backtrace { void* callstack[128]; int frames = backtrace(callstack, 128); char **strs = backtrace_symbols(callstack, frames); int i; NSMutableArray *backtrace = [NSMutableArray arrayWithCapacity:frames]; for ( i = UncaughtExceptionHandlerSkipAddressCount; i < UncaughtExceptionHandlerSkipAddressCount + UncaughtExceptionHandlerReportAddressCount; i++) { [backtrace addObject:[NSString stringWithUTF8String:strs[i]]]; } free(strs); return backtrace; } - (void)alertView:(UIAlertView *)anAlertView clickedButtonAtIndex:(NSInteger)anIndex { if (anIndex == 0) { dismissed = YES; } } - (void)handleException:(NSException *)exception { UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Unhandled exception", nil) message:[NSString stringWithFormat:NSLocalizedString( @"You can try to continue but the application may be unstable.\n" @"%@\n%@", nil), [exception reason], [[exception userInfo] objectForKey:UncaughtExceptionHandlerAddressesKey]] delegate:self cancelButtonTitle:NSLocalizedString(@"Quit", nil) otherButtonTitles:NSLocalizedString(@"Continue", nil), nil] autorelease]; [alert show]; CFRunLoopRef runLoop = CFRunLoopGetCurrent(); CFArrayRef allModes = CFRunLoopCopyAllModes(runLoop); while (!dismissed) { for (NSString *mode in (NSArray *)allModes) { CFRunLoopRunInMode((CFStringRef)mode, 0.001, false); } } CFRelease(allModes); NSSetUncaughtExceptionHandler(NULL); signal(SIGABRT, SIG_DFL); signal(SIGILL, SIG_DFL); signal(SIGSEGV, SIG_DFL); signal(SIGFPE, SIG_DFL); signal(SIGBUS, SIG_DFL); signal(SIGPIPE, SIG_DFL); if ([[exception name] isEqual:UncaughtExceptionHandlerSignalExceptionName]) { kill(getpid(), [[[exception userInfo] objectForKey:UncaughtExceptionHandlerSignalKey] intValue]); } else { [exception raise]; } } void UncaughtExceptionHandlers (NSException *exception) { NSArray *arr = [exception callStackSymbols]; NSString *reason = [exception reason]; NSString *name = [exception name]; NSString *urlStr = [NSString stringWithFormat:@"mailto://1140454645@qq.com?subject=bug报告&body=感谢您的配合!<br><br><br>" "错误详情:<br>%@<br>--------------------------<br>%@<br>---------------------<br>%@", name,reason,[arr componentsJoinedByString:@"<br>"]]; NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; [[UIApplication sharedApplication] openURL:url]; //或者直接用代码,输入这个崩溃信息,以便在console中进一步分析错误原因 NSLog(@"1heqin, CRASH: %@", exception); NSLog(@"heqin, Stack Trace: %@", [exception callStackSymbols]); } @end //然后在delegate文件里面- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions函数里面 [UncaughtExceptionHandler InstallUncaughtExceptionHandler]; NSSetUncaughtExceptionHandler (&UncaughtExceptionHandlers);

 

posted on 2015-02-05 14:16 不及格的程序员-八神 阅读(...) 评论(...) 编辑 收藏