snapshot

问题 I want to : GET data (=previous chat messages) from Firebase when entering 300m of a chatroom geolocation. My Code : Here is my basic Firebase chat function : var myDataRef = new Firebase("https://digitaldatastrategi.firebaseio.com/"); $('#messageInput').keypress(function (e) { if (e.keyCode == 13) { var name = $('#nameInput').val(); var text = $('#messageInput').val(); myDataRef.push({name: name, text: text}); $('#messageInput').val(''); } }); myDataRef.on('child_added', function(snapshot) {

问题 In the past few months our snapshots backup volume increases and hence our monthly bill in amazon EC2. Now i wanted to delete some of our old EC2 snapshots. So here is the question: How to find all the snapshots created from a single Volume ID using EC2 command line tool? I tried ec2-describe-snapshots but this list all the snapshots. We have lots of snapshots and it is very difficult for me to note them down one by one. 回答1: aws ec2 describe-snapshots --filters "Name=volume-id, Values=vol

问题 In the past few months our snapshots backup volume increases and hence our monthly bill in amazon EC2. Now i wanted to delete some of our old EC2 snapshots. So here is the question: How to find all the snapshots created from a single Volume ID using EC2 command line tool? I tried ec2-describe-snapshots but this list all the snapshots. We have lots of snapshots and it is very difficult for me to note them down one by one. 回答1: aws ec2 describe-snapshots --filters "Name=volume-id, Values=vol

问题 So I know this has been answered a number of times before, but I have yet to come across a solution that works for me. The odd thing too, is that the first time I present the Camera from a UIPickerController it works fine, exactly as intended. But then if I open it again it shows just a black screen with the Camera controls ("Cancel" button and white take picture button). Any help suppressing this error would be greatly appreciated, or even just some confirmation that this is a bug and I just

问题 So I know this has been answered a number of times before, but I have yet to come across a solution that works for me. The odd thing too, is that the first time I present the Camera from a UIPickerController it works fine, exactly as intended. But then if I open it again it shows just a black screen with the Camera controls ("Cancel" button and white take picture button). Any help suppressing this error would be greatly appreciated, or even just some confirmation that this is a bug and I just

问题 I am learning to program in iOS thru the itunesU videos and have been using xcode. I had found in xcode the feature to create snapshots which I have used to take snapshots of my project at each major milestone so far. Then I come to the chapter on using git for version control and followed their instructions to the point of "git init", which gave this response "Reinitialized existing Git repository in /Users/username/Developer/Calculator/Calculator/.git/" instead of the "initialized empty git

问题 Is there a simple way to get the download URL of a file uploaded to Firebase? (I've tried playing around with the snapshot returned by my upload function and couldn't find anything...) fileref.put(file).then(function(snapshot){ self.addEntry(snapshot); /// return snapshot.url??? }); 回答1: To get the Url created by default from the snapshot you can use downloadURL , meaning snapshot.downloadURL . Remember to always keep tracking the progress of the upload by using .on('state_changed') ,

问题 I'm seeking to populate the tableview of my users with the last message they sent or were sent just like the initial View on Messages App on iphone. I have this code but it doesn't work to iterate through the array of dictionaries that I keep snapshots in of all the messages that were sent to the user and return the expected result: func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{ let cell = tableView.dequeueReusableCell(withIdentifier: "cell",

问题 Is there a way to copy an EC2 snapshop made in one amazon account to another one and i.e. lauch a new instance with it? If it's possible, which steps do I have to do exactly? How to allow another account access to your snapshots and how to copy them across? Would appreciate your help. 回答1: This procedure will help you to share your unencrypted snapshots. For security reasons, encrypted snapshots cannot be shared or made public. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2

问题 I'm trying to take snapshot of video and than save as thumbnail. I have found this question and have done as it's there. But i get this exception: WIN32Exception was unhandled by User-Code - The system cannot find the file specified what have I done wrong? my code is here: FFMPEG f = new FFMPEG(); f.GetThumbnail(Server.MapPath("~/Uploads/" + unique), Server.MapPath("~/Thumbnails/" + unique.Remove(unique.IndexOf(".")) + ".jpg"), "1200x223"); and there's my folder structure. 回答1: You have wrong