That call to getdocumentsdirectory is a little helper. The data value type allows simple byte buffers to take on the behavior of foundation objects. You can create empty or prepopulated buffers from a variety of sources and later add or remove bytes. We use cookies for various purposes including analytics. Nsdata can be represented as hexadecimal string, similar to what it outputs in its description method swift. Writes the document to a file at the specified path. Swift language convert string to and from data nsdata. Lines 1820 go from the base64 nsdata object back to an nsstring which is how we started this example, from a string. Line 6 encodes the data and returns an nsstring object.
Im trying to upload a pdf to my server by converting the pdfdocument, which i get from the pdfview. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. Printing pdf using airprint causes small output stack overflow. At first we specify the path to the file, giving at the same time the proper file name its the invoicenumber property. The results of the drawing to pdf are stored to the pdfdata object, which is actually a nsdata object. How to show pdf from nsdata in swift how to save pdf to. In files where you want to use base64 encodingdecoding, simply include the header file and use one of the provided nsdata or nsstring additions. How to convert a hexadecimal nsstring to nsdata quora. The value of buffersize is the number of bytes to use. You could also serialize the object to a string with for example, then create the nsdata from the string.
Its a common question among ios developers, how do i convert an nsstring object to an nsdata object the. If you know an instance of data contains a string and you want to convert it, you should use the string decoding. 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. This means you do need to know which format is used to store the string, but utf8 is usually the best to go with. Download objectivec language pdf objectivec language. Then convert it to a base64 string that can be stored and used later. String get existing pdf reference let pdf cgpdfdocumentcreatewithurlnsurlfileurlwithpath.
An nsstring object encodes a unicodecompliant text string, represented as a sequence of utf16 code units. Provide me any good code example of converting nsdata to nsstring. Learn how to read and write nsdata and nsstrings to disc. Im trying to convert this objectivec code originally found in this stack overflow question which turns an nsstring into nsdata to swift. The value of abuffer is a pointer to something to be stored. Nsdatensstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring cfstringref. Nsstring to nsdata example how to convert nsstring to nsdata in objectivecios. How to save a uiimage to a file using jpegdata and pngdata. 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.
This means you do need to know which format is used to store the string, but utf8. Obtain the device token as usual when the user opts in to receive remote push notifications. Then when you need the object back retrieve the string back from the nsdata object, then deserialize it back into an object. Encoding and decoding a string using nsdata base64.
If the data instance cant be converted to a utf8 string, youll get sent back an empty string. Share extension registeredtypeidentifiers apple developer. For images in asset catalogs, specify the name of the image asset. 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. 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 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. These functions create the graphics context and associate it with a destination for the pdf data.
With the help of webview and xamarin forums, i got ideas from colleagues and finally achieved the requirement through renderers. Then i am storing the bytes from buffer p as an nsdata using the line given below. How to generate pdf using html templates in ios with swift. I am trying to read the contents of an url as a string from an url, but i get a weird. String this is my string to convert to nsdata let utf8str stri. This all started with a post of mine back in june of 2011, when i was trying to save html data to a pdf and copy the pdf data to an email as an attachment. I converted an image into the nsdata and again converting the nsdata into the string using the nsutf8stringencoding. To convert string to and from data nsdata we need to encode this string with a specific encoding. How to save a uiimage to a file using jpegdata and. Im trying to create an nsdata var from an array of bytes in objc i might have done this. Pdf download objectivec language for free previous next. I get the bellow code from this link nsstring stringnsstring. An nsstring object can be initialized from or written to a c buffer, an nsdata object, or the contents of an nsurl.
Base64 encode and decode nsdata and nsstring objects. Nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring nsstring mxarray. Strings in swift are unicode correct and locale insensitive, and are designed to be efficient. How to serialize and deserialize an ios device token from. The method you are using nsdata imagedata nsdata datawithcontentsofurl. 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. Converting a nsstring into nsdate converting a nsstring into nsdate hello. How can i create a nsdate object out of it and then get different components like day, month, date, year from it. Below example explains how to convert nsdata to nsstring with objectivec using nsstring initwithdata function we can convert nsdata to nsstring. This is using the mycontenttypes array as the data to a simple datadriven chunk of data.
It can also be encoded and decoded to and from ascii, utf8, utf16, utf32, or any other string encoding represented by nsstring encoding. 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. Feb 25, 2014 easily turn html data from an html string or url into a pdf file on ios brentnycumbnhtmlpdfkit. In recent days, i tried to convert the html string to pdf file in xamarin forms. 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. Objectivec language encoding and decoding a string using. How to serialize and deserialize an ios device token from nsdata to string and back in xamarin. I also want to display the uploaded string as a pdf from nsstring to nsdata i. The most famous one is utf8 which is an 8bit representation of unicode characters, suitable for transmission or storage by asciibased systems. This function returns nil if the encoding is not correct syntax of initwithdata idinitwithdata. Encoding convert the image to nsdata first let imagedata.
A pdf document is a data structure composed from a small set of basic types of. Utf8 encoding is used to encode the input string value to pdfname and to. Feb 28, 2011 below we follow a similar process, this time working with nsdata to add an md5 method. For png images, you may omit the filename extension. How to convert nsdata to nsstring or vice versa in. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Nsdata can be represented as hexadecimal string, similar to what it outputs in its description method. Ive read a bunch of solutions at so and mostly they involve in adding another class etc. Convert string to nsdata and nsdata to string swift. Returns nil if the initialization fails for some reason for example if data does not represent valid data for encoding. How to generate pdf using nsdata or using data bytes objective c. This function returns nil if the encoding is not correct. Jan 24, 2014 on line 2 we create the nsdata to encode.
A string is a series of characters, such as swift, that forms a collection. When you have some data which is encoded in utf8 data than you can use below code. The value of shouldfree specifies whether the receiver should attempt to free the memory pointer to by abuffer when the receiver is deallocated. Extends string class import foundation extension string func base64encoded string let plaindata datausingencodingnsutf8stringencoding let base64string plaindatabase64encodedstringwithoptionsomraw0. Adding methods to nsdata and nsstring using categories to. 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.
Uicollectionview scroll freeze with nsdata imageview ios,uicollectionview,nsdata,uicollectionviewcell,sdwebimage. You can filter and sort the content, or compare against other buffers. If you want to convert string to nsdata using nsutf8stringencoding. What is the easiest and fastest code to do a conversion between nsdata and a base64 string. How to generate a pdf file from html string in xamarin forms. I am trying to read the contents of an url as a string from an url, but i. 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. If i understand your question correctly, then the following will work. The returned object may be different from the original receiver. Fill out the form below and instructions to reset your password will be emailed to you.
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