serialization

问题 In layman's terms, what is "Serialization", and why do I need it? I read the Wikipedia entry, but still don't understand it. Why do I need to convert data into a sequence of bits to store it in a file? I am specifically concerned with using Python's pickle module to do serialization. Thanks for the time! 回答1: You can save the state of a programm (of specific objects). Imagine you have a program which runs for many hours or even days. Using pickle you can save the state of the calculation,

问题 How Could I store integers (user id's ranging from 1 to 9999) serialized in a database column and retrieve them back? In my User model I have invites column, User model serialize: invites invites = text field Now I'm trying to do 2 things: Append the user_id integer (from 1 to 9999) serialized in a column "invites" Retrieve all the user id's back from the User.invited column ( deserialize it ? ) 回答1: From the fine manual: serialize(attr_name, class_name = Object) If you have an attribute that

问题 i am trying to desearlize an object using Jackson this.prepareCustomMapper().readValue(response.getBody(), EmailResponse.class); and i have this exception: org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.despegar.social.automation.services.emailservice.response.EmailResponse]: can not instantiate from JSON object (need to add/enable type information?) at [Source: java.io.StringReader@4f38f663; line: 1, column: 12] (through

问题 String str = commonClient.authorizedRequestBuilder(commonClient.webTarget .path("/apps/get_current_version/default/"+appName+"/"+appName) .queryParam("object_type", "app")) .accept(MediaType.APPLICATION_JSON_TYPE) .get() .readEntity(String.class); i get str = {"versions": {"ap": "Not Set", "am": "topic-test-publisher-1.0.16", "il": "topic-test-publisher-1.0.16", "row": "topic-test-publisher-1.0.49"}, "provider": "gce"} Then i have changed to this code Version version = commonClient

问题 Here's my code: private void OnReceive(IAsyncResult result) { NetStateObject state = (NetStateObject)result.AsyncState; Socket client = state.Socket; int size = client.EndReceive(result); byte[] data = state.Buffer; object data = null; using (MemoryStream stream = new MemoryStream(data)) { BinaryFormatter formatter = new BinaryFormatter(); data = formatter.Deserialize(stream); } //todo: something with data client.BeginReceive( state.Buffer, 0, NetStateObject.BUFFER_SIZE, SocketFlags.None,

问题 I have a structure : struct vertex { double a; double b; } struct polygon { int numofVertex; vertex *v; } How to send this nested structure in MPI using MPI_Send? The problem is that the structure contains pointer field "v" due to which MPI_Send crashes. I have tried MPI_Datatype to define new data type, it doesnot work. I read that serialization is the only solution but C doesnot provide such implementation. Any suggestions how to get around with this problem? 回答1: You'll have to send it in

问题 So let's say pretty often a script runs that opens a browser and does web things: require 'watir-webdriver' $browser = Watir::Browser.new(:firefox, :profile => "botmode") => #<Watir::Browser:0x7fc97b06f558 url="about:blank" title="about:blank"> It could end gracefully with a browser.close, or it could crash sooner and leave behind the memory-hungry Firefox process, unnoticed until they accumulate and slow the server to a crawl. My question is twofold: What is a good practice to ensure that

问题 Is there a way by which Jackson allows custom serialization for a specific type only in a particular class? Here is my scenario: I have ClassA.java which is something like: public Class ClassA { byte[] token; String name; public getToken() { return token; } public setToken(byte[] newToken) { token = newToken; } public getName() { return name; } public setName(String newName) { name = newName; } } I do not have access to this class as it is in an external jar. However, I want to serialize the

问题 I am trying to implement Django-Rest framework for a voting application with content_type objects. I tried using the rest-framework-generic-relations for serializers.py. It seems to me that the error might be within serializer.py / views.py, but I am new to this framework and would appreciate your help! views.py: class vote_detail(generics.RetrieveUpdateDestroyAPIView): queryset = VotedItem.objects.all() serializer_class = VoteSerializer(queryset, many=True) serializers.py: from rest

问题 I am trying to implement Django-Rest framework for a voting application with content_type objects. I tried using the rest-framework-generic-relations for serializers.py. It seems to me that the error might be within serializer.py / views.py, but I am new to this framework and would appreciate your help! views.py: class vote_detail(generics.RetrieveUpdateDestroyAPIView): queryset = VotedItem.objects.all() serializer_class = VoteSerializer(queryset, many=True) serializers.py: from rest