late-binding | 易学教程

Does C# .NET support IDispatch late binding?

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问题 The Question My question is: Does C# nativly support late-binding IDispatch? Pretend i'm trying to automate Office, while being compatible with whatever version the customer has installed. In the .NET world if you developed with Office 2000 installed, every developer, and every customer, from now until the end of time, is required to have Office 2000. In the world before .NET, we used COM to talk to Office applications. For example: 1) Use the version independant ProgID "Excel.Application"

Detect and use optional external C library at runtime in Objective-C

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问题 I am building an SDK that iPhone developers can include in their projects. It is delivered as a compiled ".a", without source code. Let's call my SDK "AAA". The customer in his project (let's call it "BBB"), in addition to use AAA, may also use a 3rd party library called "CCC" - which also comes pre-compiled, closed-source. I do not sell CCC, it's a different company. My SDK, AAA, can optionally use CCC to improve the product, using those 3rd party features. For example, let's say CCC is a

Early binding vs. late binding: what are the comparative benefits and disadvantages?

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问题 When discussing the evolution of computer languages, Alan Kay says that the single most important attribute of his Smalltalk is late binding; it gives the language its malleability and extensibility, and allows inappropriate coupling to be refactored out over time. Do you agree? Are there compensating advantages for early binding that explain why it seems to be the dominant of the two paradigms for domains where either could be used? My personal experience (which is not broad or deep enough

Convert Early Binding VBA to Late Binding VBA : Excel to Outlook Contacts

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问题 Each employee gets an updated contact list. I'm creating a macro in Excel that will delete all outlook contacts, then import all the contacts on that sheet into their main outlook contacts. Not all users are on the same outlook version, so I can't use Early Binding methods since the Outlook OBJ Library cannot be referenced between versions. I managed to get my delete loop into late binding easily, but I'm having trouble getting the import code to work in late binding. Here is the working

Why results of map() and list comprehension are different?

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The following test fails: #!/usr/bin/env python def f(*args): """ >>> t = 1, -1 >>> f(*map(lambda i: lambda: i, t)) [1, -1] >>> f(*(lambda: i for i in t)) # -> [-1, -1] [1, -1] >>> f(*[lambda: i for i in t]) # -> [-1, -1] [1, -1] """ alist = [a() for a in args] print(alist) if __name__ == '__main__': import doctest; doctest.testmod() In other words: >>> t = 1, -1 >>> args = [] >>> for i in t: ... args.append(lambda: i) ... >>> map(lambda a: a(), args) [-1, -1] >>> args = [] >>> for i in t: ... args.append((lambda i: lambda: i)(i)) ... >>> map(lambda a: a(), args) [1, -1] >>> args = [] >>> for

How to do late binding in VBA?

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问题 I have this little function that achieves the creation of an email via VBA, It gets the data from another function that works together with an Excel file. The problem I have is that I made all this thru Excel 2016, and when some of my colleagues try to use it there an error of missing references (Outlook Library 16.0). So I looked in the internet solutions and the ones I found are many, but the better is Late Binding. I have read all about it but I don't seem to really understand what's going

Early and late binding

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I'm trying to get my head around when early/late binding occurs in C#. Non-virtual methods are always early bound. Virtual methods are always late bound: the compiler inserts extra code to resolve the actual method to bind to at execution time and checks for type safety. So subtype polymorphism uses late binding. Calling methods using reflection is an example of late binding. We write the code to achieve this as opposed to the compiler. (E.g. calling COM components.) VB.NET supports implicit late binding when Option Strict is off. An object is late bound when it is assigned to a variable

How to access Microsoft Word existing instance using late binding

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问题 i am developing some code in c# where i will be interacting with Microsoft Word. I want to be able to have the option of re-using an existing instance or as an alternative creating a new instance. Keeping in mind i want to do all of this using LATE BINDING... it is safe to say i have figured out how to get things working when creating a new instance.. i just call Activator.CreateInstance etc.. The problem i am having is how do i reuse an existing instance, for example, Word is already open

What exactly are late static bindings in PHP?

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问题 What exactly are late static bindings in PHP? 回答1: You definitely need to read Late Static Bindings in the PHP manual. However, I'll try to give you a quick summary. Basically, it boils down to the fact that the self keyword does not follow the same rules of inheritance. self always resolves to the class in which it is used. This means that if you make a method in a parent class and call it from a child class, self will not reference the child as you might expect. Late static binding

How do lexical closures work?

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问题 While I was investigating a problem I had with lexical closures in Javascript code, I came along this problem in Python: flist = [] for i in xrange(3): def func(x): return x * i flist.append(func) for f in flist: print f(2) Note that this example mindfully avoids lambda . It prints \"4 4 4\", which is surprising. I\'d expect \"0 2 4\". This equivalent Perl code does it right: my @flist = (); foreach my $i (0 .. 2) { push(@flist, sub {$i * $_[0]}); } foreach my $f (@flist) { print $f->(2), \"\