Checking if app is installed

[laurensjuhh325]

Hello everyone, I'm trying to find a way how to check if an app is installed.
This used to work:

// Declaration
BOOL APCheckIfAppInstalled(NSString *bundleIdentifier); // Bundle identifier (eg. com.apple.mobilesafari) used to track apps

// Implementation

BOOL APCheckIfAppInstalled(NSString *bundleIdentifier)
{
	static NSString *const cacheFileName = @"com.apple.mobile.installation.plist";
	NSString *relativeCachePath = [[@"Library" stringByAppendingPathComponent: @"Caches"] stringByAppendingPathComponent: cacheFileName];
	NSDictionary *cacheDict = nil;
	NSString *path = nil;
	// Loop through all possible paths the cache could be in
	for (short i = 0; 1; i++)
	{
	
		switch (i) {
	case 0: // Jailbroken apps will find the cache here; their home directory is /var/mobile
		path = [NSHomeDirectory() stringByAppendingPathComponent: relativeCachePath];
		break;
	case 1: // App Store apps and Simulator will find the cache here; home (/var/mobile/) is 2 directories above sandbox folder
		path = [[NSHomeDirectory() stringByAppendingPathComponent: @"../.."] stringByAppendingPathComponent: relativeCachePath];
		break;
	case 2: // If the app is anywhere else, default to hardcoded /var/mobile/
		path = [@"/var/mobile" stringByAppendingPathComponent: relativeCachePath];
		break;
	default: // Cache not found (loop not broken)
		return NO;
		break; }
		
		BOOL isDir = NO;
		if ([[NSFileManager defaultManager] fileExistsAtPath: path isDirectory: &isDir] && !isDir) // Ensure that file exists
			cacheDict = [NSDictionary dictionaryWithContentsOfFile: path];
		
		if (cacheDict) // If cache is loaded, then break the loop. If the loop is not "broken," it will return NO later (default: case)
			break;
	}
	
	NSDictionary *system = [cacheDict objectForKey: @"System"]; // First check all system (jailbroken) apps
	if ([system objectForKey: bundleIdentifier]) return YES;
	NSDictionary *user = [cacheDict objectForKey: @"User"]; // Then all the user (App Store /var/mobile/Applications) apps
	if ([user objectForKey: bundleIdentifier]) return YES;
	
	// If nothing returned YES already, we'll return NO now
	return NO;
}
Here is an example of this, assuming that your app is named "yourselfmadeapp" and is an app in the app store. 
Code:
NSArray *bundles2Check = [NSArray arrayWithObjects: @"com.apple.mobilesafari", @"com.yourcompany.yourselfmadeapp", @"com.blahblah.nonexistent", nil];
for (NSString *identifier in bundles2Check)
	if (APCheckIfAppInstalled(identifier))
		NSLog(@"App installed: %@", identifier);
	else
		NSLog(@"App not installed: %@", identifier);

But somehow it fails on my jailbroken ipad 3.2.1.
This is an app for personal use. I'm not sending this to apple so it doesn't matter if it violates the rules.

Any thoughts?
Thanks!

[laurensjuhh325]

Please, anyone?

[smithdale87]

you can use the openURL from UIApplication to try and open the app. Assume it is installed, and if the call fails, or a certain time passes then you can assume its not installed.