{"id":179,"date":"2015-09-11T21:33:39","date_gmt":"2015-09-11T19:33:39","guid":{"rendered":"http:\/\/www.albertopasca.it\/whiletrue\/?p=179"},"modified":"2018-05-25T14:11:58","modified_gmt":"2018-05-25T12:11:58","slug":"write-console-log-to-file-and-send-for-email","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/write-console-log-to-file-and-send-for-email\/","title":{"rendered":"[Objc] Write console log to file\u2026 and send for email"},"content":{"rendered":"

I\u2019ve prepared a simple class that write logs on device disk.
\nThis is very useful, because you can send and receive logs from apps, crashlog, backtrace and debug informations.<\/p>\n

<\/p>\n

How it works<\/h5>\n

It has the same behavior of\u00a0NSLog<\/strong>\u00a0method. You can pass as parameters, the format and the optional arguments.<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]FOUNDATION_EXPORT\u00a0void\u00a0NSLog(NSString\u00a0*format, …)\u00a0NS_FORMAT_FUNCTION(1,2);<\/p>\n

void\u00a0NSLog\u00a0(NSString*\u00a0format, …)\u00a0{
\n\t\/\/ […]
\n}<\/p>\n

NSLog(@"[UI:%d] – %@",\u00a0[NSThread\u00a0isMainThread], aMessage);[\/code]<\/p>\n

I\u2019ve made a custom\u00a0NSLog<\/strong>, called\u00a0APLog<\/strong>, with the same imprint.<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]FOUNDATION_EXPORT\u00a0void\u00a0APLog(NSString\u00a0*format, …)\u00a0NS_FORMAT_FUNCTION(1,2);<\/p>\n

void\u00a0APLog\u00a0(NSString*\u00a0format, …)\u00a0{
\n\t\/\/ […]
\n}<\/p>\n

APLog(@"[UI:%d] – %@",\u00a0[NSThread\u00a0isMainThread], aMessage);<\/div><\/td>
\n[\/code]
\nThe difference is that\u00a0APLog write the logs on the console and in the same time, to a file<\/em>, in details, append text to a file called console.log in your\u00a0NSDocumentDirectory<\/strong>, to a max size of XXMb (to prevent big log file).<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/\/[…]
\n[fileHandle seekToEndOfFile];
\n[fileHandle writeData:[formattedMessage dataUsingEncoding:NSUTF8StringEncoding]];
\n\/\/[…][\/code]<\/p>\n

Here the\u00a0complete classes<\/em>\u00a0and the\u00a0APLog<\/em>\u00a0method and other stuffs:<\/p>\n

https:\/\/gist.github.com\/elpsk\/9b72ffaffec947546c6b<\/a><\/p>\n

Put the include to this file, in your global project config, like\u00a0Prefix.pch<\/strong>\u00a0to use in entire application.<\/p>\n

Get callStack symbols (main.m)<\/h5>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”](lldb)\u00a0backtrace
\n*\u00a0thread\u00a0#1: tid = 0x1c03, 0x00003146 Debug`-[APViewController callMe:andANumber:](self=0x07187e50, _cmd=0x000038b9, str=0x0715aa40, aNum=38) + 230 at APViewController.m:33, stop reason = breakpoint 3.1
\nframe\u00a0#0: 0x00003146 Debug`-[APViewController callMe:andANumber:](self=0x07187e50, _cmd=0x000038b9, str=0x0715aa40, aNum=38) + 230 at APViewController.m:33
\nframe\u00a0#1: 0x0000304a Debug`-[APViewController viewDidLoad](self=0x07187e50, _cmd=0x005c5a77) + 122 at APViewController.m:16
\nframe\u00a0#2: 0x000f41c7 UIKit`-[UIViewController loadViewIfRequired] + 536
\nframe\u00a0#3: 0x000f4232 UIKit`-[UIViewController view] + 33
\nframe\u00a0#4: 0x000433d5 UIKit`-[UIWindow addRootViewControllerViewIfPossible] + 66
\nframe\u00a0#5: 0x0004376f UIKit`-[UIWindow _setHidden:forced:] + 368
\nframe\u00a0#6: 0x00043905 UIKit`-[UIWindow _orderFrontWithoutMakingKey] + 49
\n[…]
\nframe\u00a0#10: 0x00010747 UIKit`-[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1248
\nframe\u00a0#11: 0x0001194b UIKit`-[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 805
\nframe\u00a0#12: 0x00022cb5 UIKit`-[UIApplication handleEvent:withNewEvent:] + 1022
\nframe\u00a0#13: 0x00023beb UIKit`-[UIApplication sendEvent:] + 85
\nframe\u00a0#14: 0x00015698 UIKit`_UIApplicationHandleEvent + 9874
\n[…]
\nframe\u00a0#22: 0x0001117a UIKit`-[UIApplication _run] + 774
\nframe\u00a0#23: 0x00012ffc UIKit`UIApplicationMain + 1211
\nframe\u00a0#24: 0x00002b22 Debug`main(argc=1, argv=0xbffff3a4) + 130 at main.m:16
\nframe\u00a0#25: 0x00002a55 Debug`start + 53
\n(lldb)[\/code]<\/p>\n

If you want to collect app crash (backtrace) and redirect to\u00a0APLog<\/strong>, open your\u00a0main.m<\/em>file and change the original one:<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]int\u00a0main(int\u00a0argc,\u00a0char\u00a0*\u00a0argv[])
\n{
\n\t@autoreleasepool\u00a0{
\n\t\treturn\u00a0UIApplicationMain(argc, argv,\u00a0nil, NSStringFromClass([AppDelegate class]));
\n\t}
\n}[\/code]<\/p>\n

to this:<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]int\u00a0main(int\u00a0argc,\u00a0char\u00a0*\u00a0argv[])
\n{
\n\t@autoreleasepool\u00a0{
\n\t\tint\u00a0retVal;
\n\t\t@try\u00a0{
\n\t\t\tretVal\u00a0=\u00a0UIApplicationMain(argc, argv,\u00a0nil, NSStringFromClass([AppDelegate class]));
\n\t\t}
\n\t\t@catch\u00a0(NSException\u00a0*exception)\u00a0{
\n\t\t\tAPLog(@"[APL] !!! -&gt; %@",\u00a0[exception callStackSymbols]);
\n\t\t}
\n\t\treturn\u00a0retVal;
\n\t}
\n}[\/code]<\/p>\n

Well, UIApplicationMain is catched and you can write the error to disk.<\/p>\n

More crash info on<\/strong>: \u201cXcode \u2013 Power of breakpoints<\/a>\u201d and\u00a00x8badf00d and others crashes<\/a>.<\/p>\n

ZIP and send file<\/h5>\n

Using Objective-Zip\u00a0library<\/a>, prepare a zip file:<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]@try\u00a0{
\n\tZipFile\u00a0*zipFile\u00a0=\u00a0[[ZipFile alloc]\u00a0initWithFileName:yourZipFilePath mode:ZipFileModeCreate];<\/p>\n

\tNSString\u00a0*fName\u00a0=\u00a0[NSString\u00a0stringWithFormat:@"%@\/console.log", documentsDirectory];
\n\tZipWriteStream\u00a0*stream\u00a0=\u00a0[zipFile writeFileInZipWithName:fName compressionLevel:ZipCompressionLevelBest];<\/p>\n

\tNSData\u00a0*fData\u00a0=\u00a0[NSData\u00a0dataWithContentsOfFile:fName];
\n\t[stream writeData:fData];
\n\t[stream finishedWriting];<\/p>\n

\t[zipFile close];
\n\t[zipFile release];
\n}
\n@catch\u00a0(ZipException\u00a0*ze)\u00a0{
\n\treturn\u00a0nil;
\n}
\n@catch\u00a0(id\u00a0e)\u00a0{
\n\treturn\u00a0nil;
\n}[\/code]<\/p>\n

and send it for email, or make an upload to a web service automatically\u2026<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/\/ SEND MAIL WITH ZIP ATTACHMENT
\nif\u00a0(\u00a0[MFMailComposeViewController canSendMail]\u00a0)
\n{
\n\tMFMailComposeViewController\u00a0*mail\u00a0=\u00a0[[MFMailComposeViewController alloc]\u00a0init];
\n\tmail.mailComposeDelegate\u00a0=\u00a0self;
\n\t[mail setToRecipients:@[\u00a0@"support@yoursite.com"\u00a0]];
\n\t[mail setSubject:@"[APP-iOS] Support request"];<\/p>\n

\tNSData\u00a0*zipData\u00a0=\u00a0[NSData\u00a0dataWithContentsOfFile:@"yourZipPath.zip"];
\n\t[mail addAttachmentData:zipData mimeType:@"application\/zip"\u00a0fileName:@"console.zip"];<\/p>\n

\t[self presentViewController:mail animated:YES\u00a0completion:NULL];
\n}[\/code]<\/p>\n

Check for crash on start<\/h5>\n

You want to know if your app is crashed last time?
\nWell, store a\u00a0NSUserdefault<\/strong>\u00a0value on startup and delete on quit..
\nOn startup if value stored is != EMPTY, a crash happened.<\/p>\n

When you want, in your code, check it:<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(void)\u00a0checkForCrash
\n{
\n\tAppDelegate\u00a0*appDelegate\u00a0=\u00a0[[UIApplication sharedApplication]\u00a0delegate];
\n\tif\u00a0(\u00a0appDelegate.hasCrashed\u00a0)
\n\t{
\n\t\t[UIAlertView showAlertViewWithTitle:@"Crash!"\u00a0message:NSLocalizedString(@"Application has crashed :(. Please send us an email to fix the issue.",\u00a0nil)\u00a0cancelButtonTitle:NSLocalizedString(@"Cancel",\u00a0nil)\u00a0otherButtonTitles:@[NSLocalizedString(@"Send",\u00a0nil)]\u00a0onSelect:^(int\u00a0buttonIndex)
\n\t\t{
\n\t\t\t\/\/ what you want, load a controller, say Hi! to user, etc…
\n\t\t\tSegnalazioneViewController\u00a0*segnalazione\u00a0=\u00a0[self.storyboard instantiateViewControllerWithIdentifier:@"segnalazione"];
\n\t\t\t[self.navigationController pushViewController:segnalazione animated:YES];<\/p>\n

\t\t\t}\u00a0onCancel:^{<\/p>\n

\t\t\t}];
\n\t}
\n}[\/code]<\/p>\n

Note:<\/h6>\n

You can find\u00a0showAlertViewWithTitle<\/strong>:<\/p>\n

[code autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]+\u00a0(UIAlertView*)\u00a0showAlertViewWithTitle:(NSString*)\u00a0title
\n\tmessage:(NSString*)\u00a0message
\n\tcancelButtonTitle:(NSString*)\u00a0cancelButtonTitle
\n\totherButtonTitles:(NSArray*)\u00a0otherButtons
\n\tonSelect:(SelectBlock)\u00a0selected
\n\tonCancel:(CancelBlock)\u00a0cancelled;[\/code]<\/p>\n

on this old article:\u00a0uialertview-and-blocks<\/a><\/p>\n

Well, enjoy crashing!<\/p>\n","protected":false},"excerpt":{"rendered":"

I\u2019ve prepared a simple class that write logs on device disk. This is very useful, because you can send and receive logs from apps, crashlog, backtrace and debug informations.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[11,2],"tags":[169,170,171,172,173,174,175,176,177],"class_list":["post-179","post","type-post","status-publish","format-standard","hentry","category-mobile","category-objectivec","tag-aplog","tag-callstacksymbols","tag-mfmailcomposeviewcontroller","tag-nsexception","tag-objective-zip","tag-showalertviewwithtitle","tag-uiapplicationmain","tag-zipfile","tag-zipwritestream"],"yoast_head":"\n[Objc] Write console log to file\u2026 and send for email - while (true) {\u00a0}<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.albertopasca.it\/whiletrue\/write-console-log-to-file-and-send-for-email\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Objc] Write console log to file\u2026 and send for email - while (true) {\u00a0}\" \/>\n<meta property=\"og:description\" content=\"I\u2019ve prepared a simple class that write logs on device disk. 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