objective c - How to get NSURL of removable Volumes on OS X and notification when it mounts? -

i need detect when usb drive e.g. office23, mounted in os x , search file eg. jan.txt inside drive , copy app bundle.

i using following method find if volume mounted or not:

nsfilemanager *filemanager = [nsfilemanager defaultmanager]; nserror *error = error;  nsarray *keys = @[nsurlvolumenamekey, nsurlvolumeisremovablekey, nsurlvolumeisejectablekey]; nsarray *volumeurl = [filemanager mountedvolumeurlsincludingresourcevaluesforkeys:keys options:nsvolumeenumerationproducefilereferenceurls];  (nsurl *url in volumeurl) {     nslog(@"url %@", url); } 

result: file:///.file/id=6571367.2/

how can nsurl of file inside volume?

edit 1:

 nsarray *keys = [nsarray arraywithobjects:nsurlvolumenamekey, nsurlvolumeisremovablekey, nil];     nsarray *urls = [[nsfilemanager defaultmanager] mountedvolumeurlsincludingresourcevaluesforkeys:keys options:0];     nsurl *officedriveurl;     (nsurl *url in urls) {         nserror *error;         nsnumber *isremovable;         nsstring *volumename;         [url getresourcevalue:&isremovable forkey:nsurlvolumeisremovablekey error:&error];         if ([isremovable boolvalue]) {             [url getresourcevalue:&volumename forkey:nsurlvolumenamekey error:&error];             if ([[url absolutestring] containsstring:@"office"]) {                 officedriveurl = url;             }          }     }     nsurl *fullurl = [officedriveurl urlbyappendingpathcomponent:@"documents/my file2.txt"];      if ([[nsfilemanager defaultmanager]fileexistsatpath:[fullurl absolutestring]]) {         nslog(@"yes file exist %@", fullurl);     } 

still, filemanager cannot find url.

the fullurl is: file:///volumes/office/documents/my%file2.txt

when check through finder or nsfilemanager, not not work, path correct.

i don't know why filemanager did not find file using [nsurl absolutestring] method, when removed file:// file:///volumes/office/documents/my%file2.txt , modified %20, got introduced (my%20file2,txt), worked.