marshalling

问题 Given a go struct type Company struct { ID int `json:"id"` Abn sql.NullString `json:"abn,string"` } when marshalled with something like this company := &Company{} company.ID = 68 company.Abn = "SomeABN" result, err := json.Marshal(company) the result is { "id": "68", "abn": { "String": "SomeABN", "Valid": true } } The result desired is { "id": "68", "abn": "SomeABN" } I've tried explicitly stating that Abn is a string. Abn sql.NullString `json:"abn,string"` which did not change the result.

问题 I'm wondering whether anyone has a decent explanation or overview on the negative aspects of using DLLImport / PInvoke on Win32 methods from managed .Net code? I plan to make use of various Win32 methods and would like to have a greater understanding on the negative implications of doing so. Thanks, Brian. 回答1: According to MSDN - Calling Native Functions from Managed Code PInvoke has an overhead of between 10 and 30 x86 instructions per call. In addition to this fixed cost, marshaling

问题 I want to marshal a structure for use with P/Invoke, but this struct contains a field that is only relevant to my managed code, so I don't want it to be marshaled since it doesn't belong in the native structure. Is it even possible ? I was looking for an attribute similar to NonSerialized for serialization, but it doesn't seem to exist... struct MyStructure { int foo; int bar; [NotMarshaled] // This attribute doesn't exist, but that's the kind of thing I'm looking for... int ignored; } Any

问题 Based on suggestions from svick, I believe I can substancially simplify my post and question. Below, is some complete code that demonstrates my problem and question, namely marshalling bytes to structures does not work the way I'd expect... In the case of an object with two arrays seperated by another primitive, my object is not being marshalled to bytes the way I'd expect. Although I specify "Sequential", the two byte[] arrays are put in the byte array first, with the uint following. What is

问题 I've written a runnable network class that listens on a socket and unmarshalls the input. It also can write to the socket with a marshalled object. An issue arises because the socket remains open (in order to allow later communication between client and host) - this causes the unmarshalling of the input stream to hang. I've tried writing XMLStreamConstants.END_DOCUMENT from the sender side but this causes an error unmarshalling instead of hanging. Here's some of the code for the network class

问题 My object contains an instance variable that point to a File object amongst several other attributes. Because of this Marshal cannot serialize it. How can I write a bespoke dump method so to exclude only that instance variable? class Area attr_accessor :area attr_reader :several_other_attributes ........ def initialize(name) @area = name @several_other_attributes = .... @log = File.open( 'test.log', 'w') end end 回答1: You can very easily write a marshal_dump and marshal_load method that

问题 I'm trying to determine whether or not an instance of Excel of running with a particular file open, and if so attach to it so I can control that instance. I've searched around and the majority of what I've got have come from this question. It has a reference to another site, but unfortunately it's dead for me so I cannot read up on it. My code so far is; //Is Excel open? if (Process.GetProcessesByName("EXCEL").Length != 0) { Process[] processes = Process.GetProcesses(); foreach (Process

问题 Suppose I introduced a COM interface and don't want any third party to use it. I have full control over the sources of the COM component and the IDL file that holds the interface definition. My COM component will need marshalling stuff fro that interface, so I'll need to either implement IMarshal or provide a typelib or provide a proxy/stub. Obviously if I provide a typelib anyone can inspect it and find what my interface is and how it can be used. That's not what I want. What if I use proxy

问题 I got a Silverlight 5 assignment,but I struck in half way.Let me explain. My Code which works good in Windows Form (.Net framework 4) [DllImport("LiteSDK.dll", CharSet = CharSet.Ansi, EntryPoint = "GetAllUserInfo")] public static extern int GetAllUserInfo(int handle, IntPtr userHdr, ref int numOfUser); public struct BS2UserHdr { public enum ENUM { DS_MAX_NAME_LEN = 48, DS_MAX_PASSWORD_LEN = 16, DS_MIN_PASSWORD_LEN = 4, DS_TEMPLATE_SIZE = 384, DS_FACE_TEMPLATE_SIZE = 2284, MAX_FINGER = 10, MAX

问题 I implemented an out-of-proc COM server (implemented in a Service). I don't want other applications to access all the functionality in the COM server, so I developed an in-proc server (DLL) which would talk to the out-of-proc server. Because I don't want the interfaces in the out-of-proc COM server to be accessed directly, I don't embed the type library with the Service so I thought I could use #import and have access to the COM server through the TLB. However, when I try in my in-proc-server