I don't know how can I create XML document using GDataXML nor I could find any good link which can help me.Please tell me how can I perform this or give some good link.
Take look at http://www.raywenderlich.com/725/how-to-read-and-write-xml-documents-with-gdataxml tutorial. It will help you.
First create and store the xml value to a string.
Then use the following method to create the xml file in the document directory.
//Method writes a string to a xml file
-(void) writeToXMLFile:(NSString *)content
{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/xmlfile.xml",documentsDirectory];
//save content to the documents directory
[content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];
}
Related
i am doing one iphone app, for that i have to store bulk of MP3 song and images.
can ay one tell me what is the best to store those in terms of performance.
Store the image and songs in the application directory. This is best and easy way to handle. Try the following code. it will be help you.
//Store Image/Songs files to Application Directory
+(BOOL)writeToFile:(NSData *)data fileName:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// the path to write file
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
return [data writeToFile:appFile atomically:YES];
}
//Image/songs - Retrieve from Application Directory
+(NSData *)readFromFile:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
NSData *myData = [NSData dataWithContentsOfFile:filePath];
if (myData) {
return myData;
}
return nil;
}
store the MP3 song and images into resources folder of your app project and give the refrences in the sqlite database(because saving large files in sqlite database is not a good practice)
I would suggest you to store all items of large size on the device disk, i.e, Documents directory and store their physical path in core data or sqlite or at least in a plist file so that you can retrieve them as per your convenience.
I need to store my username and password in to a xml file in this format
<user>abcde</user>
<pass>123355</pass>
How I can write this file so that i can read it easily?
As suggested by #Mike .. you should use keychain to store passwords..google it ..there are tutorials available online.
As for the xml storing.
Here is the code
NSData *serializedData;
NSString *error;
serializedData = [NSPropertyListSerialization dataFromPropertyList:YourArray(You can use dictionaries.strings..and others too)
format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
if (serializedData) {
// Serialization was successful, write the data to the file system // Get an array of paths.
NSArray *documentDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [NSString stringWithFormat:#”%#/serialized.xml”,
[documentDirectoryPath objectAtIndex:0]];
[serializedData writeToFile:docDir atomically:YES];
}
else {
// An error has occurred, log it
NSLog(#”Error: %#”,error); }
}
I am using dropbox API and downloading file in application document folder.
I am able to view list of files in table from document directory. How can I read photos or file from this table view?
And what about the iPhone. Can we access document folder directly?
This is the more commonly used approach to get the documents directory –
NSArray *searchResults = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [searchResults objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
You can use NSFileManager to examine the contents of the directory. You can look at the contentsOfDirectoryAtPath:error: method.
Access document Folder -
NSDictionary *theCatalogInfo=nil;
NSString *theCatalogFilePath = [NSString stringWithFormat:#"%#/Documents/",NSHomeDirectory()];
theCatalogFilePath = [theCatalogFilePath stringByAppendingString:#"File Name"];
if(nil!=theCatalogFilePath)
{
theCatalogInfo=[[NSDictionary alloc]initWithContentsOfFile:theCatalogFilePath];
}
return theCatalogInfo;
if i place a image.png file in my resource, iphone will be able to read it. if i place a image.png file in iphone document folder it doesn't read?
i am sending the image over from my server, into the document folder. no problem with that.
i thought iphone will auto find the image file either in resource folder or document folder?
i did write any code for my app to locate the folder of my image, just called it by its file name, which is correct.
any ideas?
thks
// Get path to doc folder
NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [docpaths objectAtIndex:0];
NSString *docpath = [documentsDirectory stringByAppendingPathComponent:#"Data.plist"];
self.data = [NSArray arrayWithContentsOfFile:docpath];
done loading the plist from doc folder.
now i go to plist, get the file name and display for cell.
NSDictionary *dataItem = [data objectAtIndex:indexPath.row];
cell.icon = [UIImage imageNamed:[dataItem objectForKey:#"Icon"]];
how can i specifiy the image is in my document folder?
You can create an UIImage from a file by using imageWithContentsOfFile. However you can not read the file just specifying the name if it is in document folder. You need to get the path of your file. Check this answer to get an idea of how to get the file path of document folder.
-- edit
If your plist contains the file names in document folder, then append the filenames from plist to document folder path to get the full path. Hope it helps.
NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [docpaths objectAtIndex:0];
NSDictionary *dataItem = [data objectAtIndex:indexPath.row];
NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:[dataItem objectForKey:#"Icon"]];
cell.icon = [UIImage imageWithContentsOfFile:imagePath];
Suppose I have an model object class Box. In my Box class I add images references (png), audio (mp3) etc...
Rather than store them as NSData it seems better to reference the paths to the files...to save memory.
I would like archive this Box class. On the desktop we would use Document Packages (NSFilewrapper). But this class is not part of the Iphone OS.
Any suggestions on archiving this class and including all the files as 'document package'? This is similar to the way Applications appear as a file but are actually a folder...
Thanks!
If you really need to save the objects in Box, I would load them into an NSDictionary and the write that out:
Note: this is untested/non-production code intended to be a starting point only.
- (BOOL)saveBox:(Box*)aBox;
{
NSMutableDictionary *boxDict = [NSMutableDictionary dictionaryWithCapacity:10];
// Add contents of box to dictionary (exercise left up to original poster)
// boxDict is now populated
// write dictionary to apps document directory.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
if (!documentsDirectory) {
NSLog(#"Documents directory not found!");
return NO;
}
// Assumes Box class has name property
NSString *outputFile = [documentsDirectory stringByAppendingPathComponent:[aBox name]];
return [boxDict writeToFile:outputFile atomically:YES];
}
This could easily be modified to return the name of the file, etc. based on your needs.