NSString *qqNumber = @"343933286";

 

NSString *openQQUrl = [NSString stringWithFormat:@"mqq://im/chat?chat_type=wpa&uin=%@&version=1&src_type=web",qqNumber];

 

 NSURL *url = [NSURL URLWithString:openQQUrl];

 

[[UIApplication sharedApplication] openURL:url];