Is there any way to know if my friend is online? Thank you for your questions.

Method 1) First, there must be a Skynet firewall, and make sure it has been started. Then send the text to the other party, and then check the history inside the firewall, which records the time of each transmission and the IP of the other party. Then both of them are really offline, because that is the IP of the server that temporarily stores messages. If they are different, then one of them must be invisible! You can try texting others again, and it will be easy to understand whether you are online in the end. Another way is to use software to determine each other's geographical location according to IP. If that geographical position is similar to his previous position, it is invisible! (Method 2) Just right-click and select "Browse * * * Enjoy Files", and then move the mouse to your friend's avatar later, and your friend's IP information will be displayed! There is also the problem of showing invisibility. The main problem facing the invisible version of QQ now is that it can only be viewed before the other party goes online. In fact, there is no need to go online before the other party, you can know whether the other party is invisible. In the same way, right-click the avatar of your friend who wants to see if it is invisible, select "Browse * * * Enjoy File", and then move the mouse to the avatar of your friend later. If the other person is invisible, you can show it! (Note: All the above skills are required by QQ2005. (Method 3) For the case that QQ friends are online but currently invisible, users can use the following convenient methods to verify: users can edit the short message in the format of "FS+space+ QQ number of the other party+short message content" with their mobile phones (for example, if we want to check whether the friends with QQ number 12345 are invisible online, then the short message content should be "FS 12345, Please contact me quickly "), China mobile users will send it to 6. If the other party is really offline but not invisible, the user will receive a message on the mobile phone that reads" Mobile QQ: QQ user is not online! " And if the other party is online or invisible, the user will not receive any short messages. However, the user's mobile phone must enable the service of "Mobile QQ" to use this function. (Method 4) For users who have not opened the "mobile QQ" service, they can also use the "QQ Web Presence" service launched by the new version of QQ to check whether the other party is invisible. "QQ Web Presence" was originally a service to publish the online status of users' QQ on a webpage, which means that any other netizen who visits a webpage can have a QQ conversation with users by clicking the webpage button, which is invisible to users. The user first logs in to QQ2004, opens the /webpresence/index.shtml webpage link, and then clicks the link of "Interactive Status Code Generating Webpage" in the webpage. Next, he chooses any online picture style, enters the QQ to be queried in the "QQ/TM number" box, and can fill in the following two items at will, and click the "Generate Web Code" and "Preview Effect" buttons respectively. Click the QQ online status picture link in the "Interactive Status Web Effect" page that opens later, and QQ will automatically open a chat dialog box. Users can enter a message at will and send it to each other. If the other party is not online, QQ will immediately give the corresponding text prompt that the other party is not online, otherwise, the other party is currently in a stealth state.