objective c test string for null

There are three possible interpretations of "null" NSString: Usin...

There are three possible interpretations of "null" NSString: Using this snippet (pay attention that is a C function) before passing the else { NSLog(@"isNullOrEmpty, value not a string"); } } return retVal; } @end Browse other questions tagged ios objective-c xcode nsstring or ask your own question.

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Your first warning looks like you're trying to call objectForKey on an...

Your first warning looks like you're trying to call objectForKey on an NSArray. Which isn't going to work, as NSArray doesn't have an.

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nil (all lower-case) is a null pointer to an Objective-C object. null]]). T...

nil (all lower-case) is a null pointer to an Objective-C object. null]]). This will check if object myNSString is equal to NSNull object.

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Using Objective-C theory, a message to NIL will return nil or zero, 0) { //...

Using Objective-C theory, a message to NIL will return nil or zero, 0) { // Do stuff with the string } else { // The string is empty or nil here }.

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I wanted to test if a string has a value when it's returned from Core ...

I wanted to test if a string has a value when it's returned from Core Data. So I thought, the right way to do this was to see if it's equal to nothing.

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How to test for a (null) string in Objective C. I wanted to test if a strin...

How to test for a (null) string in Objective C. I wanted to test if a string has a value when it's returned from Core Data. So I thought, the right way.

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This will check if it's a valid but empty string (@””) as well as if i...

This will check if it's a valid but empty string (@””) as well as if its nil, since calling length on nil will also return 0. I'll take this opportunity to include a pointer to Wil.

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You can check if([empName length]==0 || [[empName stringByTrimmingCharacter...

You can check if([empName length]==0 || [[empName stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) this will return.

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I am trying to test for a null value in an object, but following code is th...

I am trying to test for a null value in an object, but following code is throwing error: NSInvalidArgumentException', reason: '-[NSNull length]: unrecognized.

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In Objective-C, there are several different varieties of nothing. NSNull is...

In Objective-C, there are several different varieties of nothing. NSNull is different from nil or NULL, in that it is an actual object, rather than a zero value. This greatly simplifies expressions, as it obviates the need to check.

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First let me just say I have very little experience with Objective C and . ...

First let me just say I have very little experience with Objective C and . a nil check, or if your JS coerces null to an empty string and ensures.

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Use Nimble to express the expected outcomes of Swift or Objective-C express...

Use Nimble to express the expected outcomes of Swift or Objective-C expressions. Would you like to add more information to the test's failure messages? Passes if 'actual' represents the empty string, "": expect(actual).to(beEmpty()).

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Statically typed languages check the uses of types in the program without a...

Statically typed languages check the uses of types in the program without actually executing, Yet another special case happens with C's null-terminated strings. .. Objective C, nil, Nil, NULL, NSNull, Maybe, from SVMaybe.

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In computer programming, a null-terminated string is a character string sto...

In computer programming, a null-terminated string is a character string stored as an array The length of a C string is found by searching for the (first) NUL byte. testing because a NUL was already there by chance from previous use of the same as well as its Objective-C sibling NSString from Foundation, both by Apple.

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Explains how to use Cocoa object wrappers for primitive C data types. To te...

Explains how to use Cocoa object wrappers for primitive C data types. To test for a null object value, you must therefore make a direct object.

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