I have an image named my-image. Can I save this image to the application bundle? If yes, can you provide me the code or paths.
As of now, I have the following code –
NSData * imageData = UIImagePNGRepresentation(userSavedImage); //convert image into .png format.
NSFileManager * fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
NSString * documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
NSString * fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.png",txtImageName.text]]; //add our image to the path
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the image
NSLog(#"image saved");
However it is saving in
/Users/tsplmac01/Library/Application Support/iPhone Simulator/4.3/Applications/BC5DE1D8-B875-44BC-AC74-04A17329F29A/.
& not in the application bundle. Please tell me how I can do it.
The app bundle is read only for the app, so it is not possible to write to it.
This is a good restriction, because it would otherwise be wiped out when the app gets updated. You may want to write to the documents directory instead.
Related
i am new to iphone programming. i want to get the title of mp3 file which is located in directory of Resourse folder
Resourse Folder Structure is following
Resourse
raj(directory)---->1.mp3
---->2.mp3
Here i know to get the path of the file if i get path it shows like this
/Users/Chary/Library/Application Support/iPhone Simulator/5.0/Applications/B02404E5-52DC-49B6-8DBB-C9946E4331AF/BiblePlayer.app/raj/1.mp3
I have a picker view in that i have to show only title like as "1","2" for 1.mp3 and 2.mp3
but how can get like this it will show the entire path
so,if any body know this please help me.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
//Provide another path if you have folder in your directory
NSArray *arrDirVideos = [fileManager contentsOfDirectoryAtPath:documentsDirectory error:nil];
It will give all files for path you provided in array like { 1.mp3,2.mp3,..} So now u can elimate .mp3 from each item of array
Use this:
NSString * mp3FilePath = [[NSBundle mainBundle]
pathForResource:#"1"
ofType:#"mp3"];
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.
In my application I am using the following code to save images/files into the application’s document directory:
-(void)saveImageDetailsToAppBundle{
NSData *imageData = UIImagePNGRepresentation(userSavedImage); //convert image into .png format.
NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.png",txtImageName.text]]; //add our image to the path
NSLog(fullPath);
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the image
NSLog(#"image saved");
}
However, there is a problem with the image name. If a file exists in the documents directory, the new file with the same name will overwrite the old file. How can I check if the file name exists in the documents directory?
Use NSFileManager's fileExistsAtPath: method to check if it exists or not.
usage
if ( ![fileManager fileExistsAtPath:filePath] ) {
/* File doesn't exist. Save the image at the path */
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil];
} else {
/* File exists at path. Resolve and save */
}
if ([[NSFileManager defaultManager] fileExistsAtPath:myFilePath])
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:#"file name"];
if([fileManager fileExistsAtPath:writablePath]){
// file exist
}
else{
// file doesn't exist
}
As Apple Documentation says it is better to perform some action and then handle no file existance than checking if file is existing.
Note: Attempting to predicate behavior based on the current state of the file system or a particular file on the file system is not recommended. Doing so can cause odd behavior or race conditions. It's far better to attempt an operation (such as loading a file or creating a directory), check for errors, and handle those errors gracefully than it is to try to figure out ahead of time whether the operation will succeed. For more information on file system race conditions, see “Race Conditions and Secure File Operations” in Secure Coding Guide.
How would i download and save an image to the root of the application so basically i can access the image via
[UIImage imageNamed:#"myimage.jpg"];
Thanks
Mason
First you need to get the Image Data
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://media03.linkedin.com/mpr/mpr/shrink_80_80/p/3/000/064/2e2/1bd3849.jpg"]];
Then you need to write the data to Documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pathLD = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"imageLD%d.jpeg",[[NSDate date] timeIntervalSince1970]]];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: pathLD]){
[imageData writeToFile:pathLD atomically:YES];
} else {
NSLog(#"File exists at path:%#", pathLD);
}
To get the image from Documents you do:
[UIImage imageWithContentsOfFile:pathLD];
Good luck :D;
You shouldn't for various reasons. Consider your application directory as being read-only.
You should use the Documents or Library directory. Apple recommends that you should use the Documents directory if your files should be user-accessible via iTunes (if you have enabled the file sharing via iTunes), or use a custom subdirectory of Library (which you need to create with NSFileManager) if it shouldn't be user-visible (but should be backed up).
You can query the path to the Library directory like this:
NSArray *paths;
paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
NSUserDomainMask, YES);
// dir = [paths objectAtIndex:0];
Substitute NSLibraryDirectory with NSDocumentsDirectory to get the Documents directory.
Then you would make a method that returns the full path to your image, and you would then do:
[UIImage imageWithContentsOfFile:[self pathForImage:#"myimage.jpg"]]
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];