We use cookies for various purposes including analytics. For custom classes, you must add the encodewithcoder. In files where you want to use base64 encodingdecoding, simply include the header file and use one of the provided nsdata or nsstring additions. However i tried adding some simple strings to dictionary as key and values. Nsdata imagedata uiimagejpegrepresentation image, 1. Returns nil if the initialization fails for some reason for example if data does not represent valid data for encoding.
Nsdata data initializes the receiver, a newly allocated nsstring, by encoding. How to convert nsdata to nsstring or vice versa in objective c and swift. Nsdata and its mutable subclass nsmutabledata provide data objects, objectoriented wrappers for byte buffers. This is because, if nsdictionary object pointer is nil, the call writetofile will simply fail, without crashing the program. Create a base64 encoded nsstring from the receivers contents using the given options. Zeb sadiq objectivec gnustep nsdata writetofile error. How to convert nsstring back to nsdata after converting nsdata to. Mar 26, 2009 i am working out with teh method writetofile. We can usensstring datausingencoding function to convert nsstring to nsdata. The first way to create a pdf uses nsviews datawithpdfinsiderect method and is the manner in which pdf generation is commonly shown.
Extends string class import foundation extension string func base64encoded string let plaindata datausingencodingnsutf8stringencoding let base64string plaindatabase64encodedstringwithoptionsomraw0. Hi, i noticed a case when utf8 string is broken by 2 bytes utf8 character being 1 byte long, for example only b1100 character appears and then a valid ascii character appears after it, using your code with small modifications i was able to solve this issue, and parse the json successfully. An nsstring object initialized by converting the bytes in data into utf16 code units using encoding. Nsdata nsstring nsdictionary nsarray are property list objects. If useauxiliaryfile is yes, the data is written to a backup file and then, assuming no errors occur, the backup file is renamed atomically to the intended file name. What would a string be any different from a nsstring variable. Nsdata nsdatawritingatomic example in objective c ios. 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. Nsstringencodingencoding converting the bytes in data into unicode characters. My first thought was to figure out how to readwrite to files, but i checked for classes on the iphone reference forms and only found nsfilehandle, nsobject, nsfile, etc.
Jun 29, 2011 if i understand your question correctly, then the following will work. Example prints the value of nsstring object on the console using the nslog function. Nsdata write to pdf you can convert nsdata to pdf with bellow code. Hey guys im trying to make a todo list and i need to know how to save data in anyway shape or form. Apr 20, 20 few of my friends are facing issue in uploading json data on server. The cocoapods website has an optional integration with appsight. Data objects can manage the allocation and deallocation of byte buffers automatically. For more information, seesecuring file operations in secure coding guide. Mar 10, 20 code to convert an nsstring to an nsdata object. Recommended software programs are sorted by os platform windows, macos, linux, ios, android etc. Nsdictionary nsarray nsdata nsstring for more complicated purposes, nsoutputstream might be the best option, but for simply writing a date or even xml this might be the simplest and fasted way. Contribute to nori0620swiftfilepath development by creating an account on github.
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. If you need to produce a digest of string information, you need to decide what character encoding is to be used and convert your string to a data object of that encoding type first using the nsstring datausingencoding. Create a base64, utf8 encoded nsdata from the receivers contents using the given options. I am using nsfilemanager createfileatpath, and i need to convert the nsarray into nsdata first. Below example explains how to convert nsdata to nsstring with objectivec using nsstring initwithdata function we can convert nsdata to nsstring.
I have an nsarray of strings i would like to save as a text file of strings on separate lines. If the arrays contents are all property list objects nsstring, nsdata, nsarray, or nsdictionary objects, the file written by this method can be used to initialize a new array with the class method array with contents of file. Nsstringnsarary nsarray array str componentsseparatedbystring. In this post ill do the opposite, putting the conversion into the context how to print an nsdata object to the debugging console. Mongodb is an opensource document database, and the leading nosql database. Data objects let simple allocated buffers that is, data with no embedded pointers take on the behavior of foundation objects. You need to decode the base64 encoded string, with something like.
This answer is wrong when str contains code points larger than 127. 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. Nslog print nsstring example we provides the code and examples of print nsstring nslog. Im trying to learn swift 3 with translating a code from swift 2. Loadfromdatadata always returns null and that was working on ios 8. Constants 25 nsdatareadingoptions 25 nsdatawritingoptions 26 nsdatasearchoptions 26 appendixa deprecatednsdatamethods29 deprecatedinios4. How can i convert my zipfile to nsdata to email my zip.
How to convert nsdata to nsstring or vice versa in objective. Creates an md5 digest of the information stored in the receiver and returns it as an autoreleased 16 byte nsdata object. If path contains a tilde character, you must expand it with stringbyexpandingtildeinpath before invoking this method. Nsdata and nsmutabledata are typically used for data. If the data is not nullterminated, you should use initwithdata. If you arent sure whether a class supports nscoding, check its class documentation. 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. Jun 25, 20 on ios programming, one of the most frequent tasks is manipulation with files. So lets utilize our awesome method swizzling to be able to configure the description of nsdata. The value of abuffer is a pointer to something to be stored. And then apply base64 encoding to convert it into a base64 encoded string. Examples of nsstring for initializing with file, url, data, comparing, pathcomponents, prefix, suffix, replace occurrences and more. I am writing this post for those developer who are new in afnetworking and unable to upload json data on there web server. Heres an example of saving a dictionary object to a file.
More capabilities including statistics processing will be added in future releases. This method may not be appropriate when writing to publicly accessible files. First of all, the output is prepended with a timestamp and other garbage, and secondly, it goes to stderr here are some possible techniques for printing nsstrings to stdout. I just came across this, even though im sticking with the string functions. Nsstring path writes the bytes in the receiving object to the file specified atomically. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. This function returns nil if the encoding is not correct. Using local files is one of the most efficient way to store your local data, other ways may include nsuserdefault, core data, but local files is very easy to be implemented and organized. I generated a pdf file in my program and i have it here. To create a pdf with it, you simply create a nsdata object by passing datawithpdfinsiderect the bounds of the view that you want to save. Creating nsstring from nsdata by fixing invalid utf8 characters. Recently, i found myself in need of a quick way to dump an nsstring to stdout the foundation apis provide nslog, but nslog is no good for anything but debugging. Mar 12, 20 convert nsdata to nsstring in the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. If monomac allows you to use a record type of generic password, the password will be stored in the generic property rather than valuedata.
Writes document data of type doc type to the file file name, returning whether the operation was successful. Nsdata data nsdata alloc initwithbase64encodedstring. Writes the data objects bytes to the file specified by a given path. Nsdata creates static data objects, and nsmutabledata creates dynamic data objects. The value of buffersize is the number of bytes to use. Youd also need to write code to deserialize on the other side. In the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. Ive had various permissions issues between the simulatordevices with file urls so i tend to avoid them in favor of path strings. The value of shouldfree specifies whether the receiver should attempt to free the memory pointer to by abuffer when the receiver is deallocated. Writes a property list representation of the contents of the dictionary to a given path. How to convert a hexadecimal nsstring to nsdata quora. Convert utf8 encoded nsdata to nsstring stack overflow.
If the arrays contents are all property list objects nsstring, nsdata, nsarray, or nsdictionary objects, the file written by this method can be used to initialize a new array with the class method arraywithcontentsoffile. Nsdata writetofile options error example in objective c ios. I get the bellow code from this link nsstring stringnsstring. I began programming in 1966 with fortranii and in 1969 with bal360 and 1401autocode in 1970, et al.
My immediate reaction is to serialize to nsdata or nsstring first, then make an nsarray and write it to the plist. Among other things, data objects can be stored in collections, written to property lists, saved to files, and transmitted over communication ports. Create file for nsdata write tests and nsfilehandle. This tutorial help you how to using nslog print nsstring format. The basic pattern described above may be replicated within the scope of support of the existing probes and trace sources. Contribute to microsoftwinobjc development by creating an account on github. To securely write data to a public location, use nsfile handle instead. Remember, the valuedata property is nsdata, not a string. If youre trying to get going with gnustep, you follow all of the instructions but you come accross the following message. If the location of the range specified lies beyond the end of the data self length nsdata to nsstring nsstring string n.
The returned object may be different from the original receiver. Nsdata nsdatawritingatomic example code in objective c ios. Nsmutabledictionary writetofile always fail macrumors forums. Nsmutabledictionary writetofile always fail you may also check the validity of nsdictionary object at the time of calling writetofile.
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