Mac OS X: open application at login, without showing the main window

Question

I am developing an application that I want to start automatically when the user logs in. There are several answers on how to do this, in particular I\'m using the code from

Answer 1

Well, I've found how to do it... This Open Radar bug report helped, I was using the wrong property.

Here's the code:

- (void)enableLoginItemWithLoginItemsReference:(LSSharedFileListRef )theLoginItemsRefs ForPath:(NSString *)appPath {
// We call LSSharedFileListInsertItemURL to insert the item at the bottom of Login Items list.
CFURLRef url = (CFURLRef)[NSURL fileURLWithPath:appPath];

CFMutableDictionaryRef inPropertiesToSet = CFDictionaryCreateMutable(NULL, 1, NULL, NULL);
CFDictionaryAddValue(inPropertiesToSet, kLSSharedFileListLoginItemHidden, kCFBooleanTrue);

LSSharedFileListItemRef item = LSSharedFileListInsertItemURL(theLoginItemsRefs, kLSSharedFileListItemLast, NULL, NULL, url, inPropertiesToSet, NULL);       
if (item) {
    CFRelease(item);
}
}

The solution was to create a dictionary with the key kLSSharedFileListLoginItemHidden and value true, and pass it to the LSSharedFileListInsertItemURL function.