Get only image files from directory - iphone

Question

I am storing image file in cache directory . Later I want to get all image file list from cache directory. I am using following code to get all files.
[fileManager contentsOfDirectoryAtPath:pathForCacheDirectory error:&error]
How to separate image files from this. Image file can be any format.
Thanks in advance.

Answer 1

// Store your supported image Extensions
NSArray *extensionList = [NSArray arrayWithObjects:#"jpg", #"jpeg", #"png", #"gif", #"bmp", nil];
// Grab the content Directory
NSArray *contents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:pathForCacheDirectory error:&error];
NSMutableArray *listOfImageFiles = [NSMutableArray arrayWithCapacity:0];
// Check for Images of supported type
for(NSString *filepath in contents){
if ([extensionList containsObject:[filepath pathExtension]])
{
// Found Image File
[listOfImageFiles addObject:filepath];
}
}
NSLog(#"Lisf of Image Files : %#",listOfImageFiles);

Answer 2

a brutal way is to enum all extensions you consider it to be an image.
a better way is using UTI, check this Get the type of a file in Cocoa

Answer 3

You can filter file using extensions.
NSArray *contents = [fileManager contentsOfDirectoryAtPath:pathForCacheDirectory error:&error];
for(NSString *filepath in contents){
if ([[filepath pathExtension] isEqualToString: #"png"]) {
// Your code
}
}

Answer 4

Try this, hope this will help.
NSArray * contents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:YOURPATH error:NULL];
NSMutableArray * onlyImages = [[NSMutableArray alloc]init];
for (NSString * contentPath in contents) {
NSString * lastPath = [contentPath pathExtension];
if ([lastPath isEqualToString:#"jpg"] || [lastPath isEqualToString:#"jpeg"] || [lastPath isEqualToString:#"png"] || /* any other */ ) {
[onlyImages addObject:contentPath]; // only images
}
}

Answer 5

See this & check:
CFStringRef fileExtension = (CFStringRef) [file pathExtension];
CFStringRef fileUTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, fileExtension, NULL);
if (UTTypeConformsTo(fileUTI, kUTTypeImage)) NSLog(#"It's an image");
else if (UTTypeConformsTo(fileUTI, kUTTypeMovie)) NSLog(#"It's a movie");
else if (UTTypeConformsTo(fileUTI, kUTTypeText)) NSLog(#"It's text");
else NSLog(#"It's audio");