Using nsdata for your network messages one of the hurdles you have to overcome when building an app like downside is how to handle network messages. So lets utilize our awesome method swizzling to be able to configure the description of nsdata. In files where you want to use base64 encodingdecoding, simply include the header file and use one of the provided nsdata or nsstring additions. This function returns nil if the encoding is not correct syntax of initwithdata idinitwithdata. I believe the issue everyone else is talking about is when we use rnencryptor to encrypt some nsstring instance to an nsdata instance and then subsequently send that data object to the server, whats sent to the server is not the encrypted string but rather the description method output. An nsstring object initialized by converting the bytes in data into utf16 code units using encoding. I recently needed to calculate a sha1 hash in an ios app. Nsdata creates static data objects, and nsmutabledata creates dynamic data objects. Nsstring to nsdata example how to convert nsstring to nsdata in objectivecios. Focusses on providing high quality ios programming tutorial and more. As such, nsdata objects can be used interchangeably with the cfdata pointer type, cfdataref. Create a base64 encoded nsstring from the receivers contents using the given options. You can save objects of any of these types without doing anything special.
In this tutorial well discuss nsnumber and nsstring data types used in objectivec. Convert utf8 encoded nsdata to nsstring stack overflow. Returns an nsstring object that contains a hexadecimal representation of the receiver s contents. Nsdata is tollfree bridged with the core foundation type cfdata. This function returns nil if the encoding is not correct. All methods in wsencoder class have return value that is a pointer of nsdata stream command sent to the woosim printer. An atomic write first writes the data to a temporary file and then, only if this write succeeds, moves the temporary file to its final location. Currently, im modyfying pixel data in a c array, copying to nsdata, and then. Mar 12, 20 in the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. Nserrorfailingurlstringkeyvarmobileapplications6ef91ece9e7a40199f076dfe028effeadocuments. This answer is wrong when str contains code points larger than 127.
Returns nil if the initialization fails for some reason for example if data does not represent valid data for encoding. If the data is not nullterminated, you should use initwithdata. In the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. How can i create a nsdate object out of it and then get different components like day, month, date, year from it.
We use cookies for various purposes including analytics. All lengths, character indexes, and ranges are expressed in terms of 16bit platformendian values, with index values starting at 0 an nsstring object can be initialized from or written to a c buffer, an nsdata object, or the contents of an nsurl. Apple provides several ways of adding networking to your apps including gamekit and the new multipeer connectivity framework in ios 7. Tostringnsstringencoding returns a string representation of the value of the current instance. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. Data in swift 3 parsing a doom wad file appventure. Ill also throw in an optimal nsdata tohexstring method for good measure, hopefully to help counteract the awful practice some developers have adopted of using the nsdata description for that serialization. This method may not be appropriate when writing to publicly accessible files. Ill also throw in an optimal nsdata to hexstring method for good measure, hopefully to help counteract the awful practice some developers have adopted of using the nsdata description for that serialization. Note that nsdata is an immutable class, which means the contents of the data object cannot be changed after initialization. This site contains user submitted content, comments and opinions and is for informational purposes only. An nsstring object encodes a unicodecompliant text string, represented as a sequence of utf16 code units.
I will be receiving many nsdata objects in rapid succession and want to know if there is a better way to go. Nsdata and nsstring saving data in ios raywenderlich. These new types differ not only in their memory behaviour and name, their methods also differ from their referencebased counterparts 1. Using nsdata for your network messages collective idea.
Returns an nsdata object containing a representation of the receiver encoded using a given encoding. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. Then i am storing the bytes from buffer p as an nsdata using the line given below. In this post ill do the opposite, putting the conversion into the context how to print an nsdata object to the debugging console by default, when you print an nsdata object to the console using nslog, the output will be in hex, it will look something like the following. Converting a nsstring into nsdate converting a nsstring into nsdate hello. An nsdata object containing bytes in encoding and the default plain text format that is, pure content with no attributes or other markups for that encoding. In this post ill do the opposite, putting the conversion into the context how to print an nsdata object to the debugging console. Hi readers,this blog includes the concept of converting nsdata to uiimage with the help of a very simple example. Thanks hi, you can use the following code for nsstring initwithformat function. If i understand your question correctly, then the following will work. Objectivec sha1 categories for nsdata and nsstring at george. To securely write data to a public location, use nsfile handle instead. Its a common question among ios developers, how do i convert an nsstring object to an nsdata object the conversions is as simple as shown below.
Nsarray nsdata nsdate nsdictionary nsnumber nsstring. Fill out the form below and instructions to reset your password will be emailed to you. I did not find a good example from online like stackoverflow and this forums to find an example. Jun 28, 2011 matts answer should take care of it, but if it absolutely doesnt and youre somehow absolutely sure that your nsdata object has valid string data in it then you can access the data directly via the data bytes method, build a traditional c stri. Below example explains how to convert nsdata to nsstring with objectivec using nsstring initwithdata function we can convert nsdata to nsstring. Nsstring nsarary nsarray array str componentsseparatedbystring. Nsdata and its mutable subclass nsmutabledata provide data objects, objectoriented wrappers for byte buffers. Matts answer should take care of it, but if it absolutely doesnt and youre somehow absolutely sure that your nsdata object has valid string data in it then you can access the data directly via the data bytes method, build a traditional c stri. Writes the data objects bytes to the file specified by a given path. Registers an object for being observed externally using nsstring keypath. Sign in sign up instantly share code, notes, and snippets. Creates a data object by reading every byte from the file at a given path. The foundation framework defines several classes that provide the standard, objectoriented data structures found in other high level.
Creating nsstring from nsdata by fixing invalid utf8. Dec 03, 2010 nsstring initwithformat nsstring initwithformat hi, please lets know how to use nsstring initwithformat function. The returned object may be different from the original receiver. How to convert nsdata to nsstring or vice versa in objective. Is there are way to index a single byte as you would in a c array without check in range, or some other slowy downy sounding thing. Aug 12, 20 hi guys, seemingly the nsdata object is kind of tight with giving up the data. Many common objectivec classes already conform to nscoding. Extends string class import foundation extension string func base64encoded string let plaindata datausingencodingnsutf8stringencoding let base64string plaindatabase64encodedstringwithoptionsomraw0.
Create a base64, utf8 encoded nsdata from the receivers contents using the given options. Swift 3 encompasses many different small and big changes to the language. Jun 29, 2011 if i understand your question correctly, then the following will work. If you arent sure whether a class supports nscoding, check its class documentation. The foundation framework defines several classes that provide the standard, objectoriented data structures found in other high level languages. Loadfromdata data always returns null and that was working on ios 8. Tostring returns a string representation of the value of the current instance. Since this issue is still open, id like to add my voice to it as well although im using nodejs not php. Nsdata provides methods for atomically saving their contents to a file, which guarantee that the data is either saved in its entirety, or it fails completely. Nsdata to byte array, api different that apple api. Hi guys, seemingly the nsdata object is kind of tight with giving up the data. One of them is the introduction of value type wrappers for common foundation reference types such as nsdata data or nsdate date.
How to convert a hexadecimal nsstring to nsdata quora. If the return value is nil, it means that it uses a wrong parameter for the specific api or uses improper mode between the standard mode and the page mode. How to convert nsdata to nsstring or vice versa in. Adding methods to nsdata and nsstring using categories to. Its a common question among ios developers, how do i convert an nsstring object to an nsdata object the. Nsstring objects are used throughout foundation and other cocoa frameworks, serving as the basis for all textual and linguistic functionality on the platform. How to convert nsdata to nsstring or vice versa in objective c and.
I want to convert nsdata to nsstring what is the best way to do this. Utf8 encoded nsdata from the receivers contents using the given options. Data objects let simple allocated buffers that is, data with no embedded pointers take on the behavior of foundation objects. Now i am converting it to a nsstring using the code given below but when i print it into console its giving some other characters.