NSString stringByAppendingPathExtension example ios

[NSString stringByAppendingPathExtension]

Returns a new string made by appending to the receiver an extension separator followed by a given extension.

- (NSString *)stringByAppendingPathExtension:(NSString *)ext

Parameters

ext

The extension to append to the receiver.

Return Value

A new string made by appending to the receiver an extension separator followed byext.

Discussion of [NSString stringByAppendingPathExtension]

The following table illustrates the effect of this method on a variety of different paths, assuming that ext is supplied as @"tiff":

Receiver’s String Value	Resulting String
“/tmp/scratch.old”	“/tmp/scratch.old.tiff”
“/tmp/scratch.”	“/tmp/scratch..tiff”
“/tmp/”	“/tmp.tiff”
“scratch”	“scratch.tiff”

Note that adding an extension to @"/tmp/" causes the result to be @"/tmp.tiff"instead of @"/tmp/.tiff". This difference is because a file named @".tiff" is not considered to have an extension, so the string is appended to the last nonempty path component.

[NSString stringByAppendingPathExtension]

This method does not allow you to append file extensions to filenames starting with the tilde character (~).

Note that this method only works with file paths (not, for example, string representations of URLs).

Example of [NSString stringByAppendingPathExtension]

// path contains the path to the folder you want to find the file in.

// create the full file name

NSString* shortPath = [@"input" stringByAppendingPathExtension: @"txt"];
NSString* fullPath = [path stringByAppendingPathComponent: shortFileName];

// open the file.  we convert to an NSURL so we can use the better open method
NSURL* fileURL = [NSURL fileURLWithPath: fullPath];
NSError* error = nil;
NSFileHandle *file=[NSFileHandle fileHandleForReadingFromURL: fileURL
                                                       error: &error];
if (file == nil)
{
    // error contains info on what went wrong
}
else
{
    // do what you need
}

Example of [NSString stringByAppendingPathExtension]

@interface NSString (MoreMagic)
- (NSString *)stringByAddingFileSuffix:(NSString *)suffix;
@end

@implementation NSString (MoreMagic)
- (NSString *)stringByAddingFileSuffix:(NSString *)suffix
{
    NSString * extension = [self pathExtension];
    NSString * baseName = [self stringByDeletingPathExtension];
    NSString * thumbBase = [baseName stringByAppendingString:suffix];
    return [thumbBase stringByAppendingPathExtension:extension];
}
@end

Example of [NSString stringByAppendingPathExtension]

NSString* directoryPath = [NSString stringWithFormat: @"%@/Files", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex: 0]];
    [[NSFileManager defaultManager] createDirectoryAtPath:directoryPath withIntermediateDirectories:YES attributes:NO error:nil];

    NSMutableArray *FilesArray=[[NSMutableArray alloc] initWithObjects:@"path1",@"path2"]];//add file Paths To FilesArray    
    for(int i=0;i<[FilesArray count];i++)
    {
        NSString *str=[directoryPath copy];
        str=[str stringByAppendingPathExtension:[NSString stringWithFormat:@"File %i",i+1]];
        NSData *FileData = [[NSData alloc] initWithContentsOfFile:[FilesArray objectAtIndex:i]]; 
        [FileData writeToFile:str atomically:NO];
        [str release];
    }