Uploaded October 2012 | Updated September 2026, 2 weeks ago
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By suphalb@techytube, for more from this author visit:
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These videos would demonstrate you how to deal with RPM (Redhat Package Manager) on any Linux System what supports RPM for all applications and software packages. Watching these video one should be able to install,remove,update,freshen rpm packages. Additionally these videos would help you to learn how to install any RPM packages forcefully without dependency checking and many more. Please watch all of these 3 videos simultaneously for maximum gain. Keep visiting techytube.com for more quality videos and articles to gain your knowledge and it's all for free.
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TechyTube Team
Subscribe to our channel here for notifications on new video trainings. For more videos on technology, visit our website at http://www.techytube.com.
By suphalb@techytube, for more from this author visit:
techytube.com/author/suphalb
These videos would demonstrate you how to deal with RPM (Redhat Package Manager) on any Linux System what supports RPM for all applications and software packages. Watching these video one should be able to install,remove,update,freshen rpm packages. Additionally these videos would help you to learn how to install any RPM packages forcefully without dependency checking and many more. Please watch all of these 3 videos simultaneously for maximum gain. Keep visiting techytube.com for more quality videos and articles to gain your knowledge and it's all for free.
Thank You
TechyTube Team
![Archiving and unarchiving objects in Objective-C
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By pavel@techytube, for more from this author visit:
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There are situations when we want to save the state of our objects to the system, for example when our app has to go in the background, or to terminate.
Of course, we can do our way for saving our objects, but iOS SDK provides us an elegant way for doing that by using NSKeyedArchiver - to archive objects, and NSKeyedUnarchiver - to unarchive objects.
But in order for those methods to work correctly, we need to implement 2 instance methods in the class we want to be able to archive, or unarchive.
These methods are mandatary in such situations, and should look like this:
- (void)encodeWithCoder:(NSCoder *)coder
{
[coder encodeObject:somePropertyOrField forKey:@KeyName];
}
- (id)initWithCoder:(NSCoder *)coder
{
self.propertyName = [coder decodeObjectForKey:@KeyName1];
fieldName = [coder decodeObjectForKey:@KeyName2];
return self;
}
somePropertyOrField must be a property or a field of our class; @KeyName, @KeyName1 ..., @KeyNamen may be arbitrary names we choose.
To archive (save the object on the File System), we use:
[NSKeyedArchiver archiveRootObject:objectName toFile:@/Users/pavel/myObjectState.plist];
which create the .plist file (which a special XML-format file in iOS) at the indicated path.
To unarchive (restore an object state from a file), we use:
MyClass *newObjectName = [NSKeyedUnarchiver unarchiveObjectWithFile:@/Users/pavel/myObjectState.plist];
which initializes the new object with the corresponding values from the .plist file. Archiving and unarchiving objects in Objective-C](https://i.ytimg.com/vi/KSIU8zRi7zk/mqdefault.jpg)









