I converted an image into the nsdata and again converting the nsdata into the string using the nsutf8stringencoding. Nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring mxarray. Provide me any good code example of converting nsdata to nsstring. 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. Base64 encode and decode nsdata and nsstring objects. The returned object may be different from the original receiver. At first we specify the path to the file, giving at the same time the proper file name its the invoicenumber property.
Nsstring to nsdata example how to convert nsstring to nsdata in objectivecios. For images in asset catalogs, specify the name of the image asset. If you know an instance of data contains a string and you want to convert it, you should use the string decoding. I get the bellow code from this link nsstring stringnsstring. Converting a nsstring into nsdate converting a nsstring into nsdate hello.
This function returns nil if the encoding is not correct. 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. An nsstring object can be initialized from or written to a c buffer, an nsdata object, or the contents of an nsurl. Line 6 encodes the data and returns an nsstring object. How to convert nsdata to nsstring or vice versa in. If the data instance cant be converted to a utf8 string, youll get sent back an empty string.
Extends string class import foundation extension string func base64encoded string let plaindata datausingencodingnsutf8stringencoding let base64string plaindatabase64encodedstringwithoptionsomraw0. Printing pdf using airprint causes small output stack overflow. The data value type allows simple byte buffers to take on the behavior of foundation objects. If youve generated an image using core graphics, or perhaps rendered part of your layout, you might want to save that out as either a png or a jpeg. A pdf document is a data structure composed from a small set of basic types of. An nsstring object encodes a unicodecompliant text string, represented as a sequence of utf16 code units. How to save a uiimage to a file using jpegdata and pngdata. The value of abuffer is a pointer to something to be stored. Convert string to nsdata and nsdata to string swift.
In files where you want to use base64 encodingdecoding, simply include the header file and use one of the provided nsdata or nsstring additions. Learn how to read and write nsdata and nsstrings to disc. Im trying to create an nsdata var from an array of bytes in objc i might have done this. Nsdatensstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring cfstringref. 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.
What is the easiest and fastest code to do a conversion between nsdata and a base64 string. Then when you need the object back retrieve the string back from the nsdata object, then deserialize it back into an object. How to generate pdf using nsdata or using data bytes objective c. Writes the document to a file at the specified path. Nsdata can be represented as hexadecimal string, similar to what it outputs in its description method. Its a common question among ios developers, how do i convert an nsstring object to an nsdata object the. To convert string to and from data nsdata we need to encode this string with a specific encoding. The results of the drawing to pdf are stored to the pdfdata object, which is actually a nsdata object. For now, simply save the nsdata to your documents directory on ios, which is not a managed persistent store like coredata or realm, nor is it userdefaults. This function returns nil if the encoding is not correct syntax of initwithdata idinitwithdata. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. With the help of webview and xamarin forums, i got ideas from colleagues and finally achieved the requirement through renderers.
Swift language convert string to and from data nsdata. How to generate pdf using html templates in ios with swift. You could also serialize the object to a string with for example, then create the nsdata from the string. Pdf download objectivec language for free previous next. Strings in swift are unicode correct and locale insensitive, and are designed to be efficient. That call to getdocumentsdirectory is a little helper. 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. Nsdata can be represented as hexadecimal string, similar to what it outputs in its description method swift. Jan 24, 2014 on line 2 we create the nsdata to encode. Encoding convert the image to nsdata first let imagedata.
String get existing pdf reference let pdf cgpdfdocumentcreatewithurlnsurlfileurlwithpath. First of all, that nsdata is your pdf, no need to convert to another data type or use a library to manipulate it at the moment. Below example explains how to convert nsdata to nsstring with objectivec using nsstring initwithdata function we can convert nsdata to nsstring. The code for the nsdata object will come from the contents of a file, this will provide the background you need to generate an md5 from a file or an nsdata object that you could populate via other means such as the return value from a nsurlconnection. Feb 25, 2014 easily turn html data from an html string or url into a pdf file on ios brentnycumbnhtmlpdfkit. Im trying to upload a pdf to my server by converting the pdfdocument, which i get from the pdfview.
Utf8 encoding is used to encode the input string value to pdfname and to. When you have some data which is encoded in utf8 data than you can use below code. Returns nil if the initialization fails for some reason for example if data does not represent valid data for encoding. Lines 1820 go from the base64 nsdata object back to an nsstring which is how we started this example, from a string. This is using the mycontenttypes array as the data to a simple datadriven chunk of data. I am trying to read the contents of an url as a string from an url, but i.
These functions create the graphics context and associate it with a destination for the pdf data. You can filter and sort the content, or compare against other buffers. Then convert it to a base64 string that can be stored and used later. How to convert a hexadecimal nsstring to nsdata quora. Then i am storing the bytes from buffer p as an nsdata using the line given below. An nsstring object initialized by converting the bytes in data into utf16 code units using encoding. Objectivec language encoding and decoding a string using. 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. If you want to convert string to nsdata using nsutf8stringencoding. Feb 28, 2011 below we follow a similar process, this time working with nsdata to add an md5 method. The value of buffersize is the number of bytes to use. This means you do need to know which format is used to store the string, but utf8. Download objectivec language pdf objectivec language.
For png images, you may omit the filename extension. The method you are using nsdata imagedata nsdata datawithcontentsofurl. How to show pdf from nsdata in swift how to save pdf to. Im trying to convert this objectivec code originally found in this stack overflow question which turns an nsstring into nsdata to swift. Adding methods to nsdata and nsstring using categories to. If i understand your question correctly, then the following will work. How to generate a pdf file from html string in xamarin forms. I had always wanted to make the code better and was finally able to.
You can create empty or prepopulated buffers from a variety of sources and later add or remove bytes. 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. Uicollectionview scroll freeze with nsdata imageview ios,uicollectionview, nsdata,uicollectionviewcell,sdwebimage. Encoding and decoding a string using nsdata base64. Obtain the device token as usual when the user opts in to receive remote push notifications. The post of mine generates a bunch of traffic to my blog to this day, by an order of 10 fold to the next top page and is still a very popular problem that. How can i create a nsdate object out of it and then get different components like day, month, date, year from it. String this is my string to convert to nsdata let utf8str stri. For example, if different content types have different policies for handling the content, you could define a policy like this.
In recent days, i tried to convert the html string to pdf file in xamarin forms. It can also be encoded and decoded to and from ascii, utf8, utf16, utf32, or any other string encoding represented by nsstring encoding. We use cookies for various purposes including analytics. I am trying to read the contents of an url as a string from an url, but i get a weird. Share extension registeredtypeidentifiers apple developer. Support to convert the html to pdf in xamarin forms. I also want to display the uploaded string as a pdf from nsstring to nsdata i. To go back the other way, from a base64 encoded nsstring object to an nsdata object is as easy as calling the method initwithbase64encodedstring, passing in the base64 encoded nsstring lines 1415. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Uicollectionview scroll freeze with nsdata imageview ios,uicollectionview,nsdata,uicollectionviewcell,sdwebimage.
How to serialize and deserialize an ios device token from. How to serialize and deserialize an ios device token from nsdata to string and back in xamarin. This means you do need to know which format is used to store the string, but utf8 is usually the best to go with. The value of shouldfree specifies whether the receiver should attempt to free the memory pointer to by abuffer when the receiver is deallocated. How to save a uiimage to a file using jpegdata and. String swift standard library apple developer documentation. Ive read a bunch of solutions at so and mostly they involve in adding another class etc. For the uigraphicsbeginpdfcontextdata function, the destination is an nsmutabledata object that you provide. Fill out the form below and instructions to reset your password will be emailed to you. A string is a series of characters, such as swift, that forms a collection.
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