全局函数是否有等效的 CallByName? [英] Is there a CallByName equivalent for global functions?

问题描述

我想这样做:如果有一个模块 X 包含一个函数 Y 则调用它，否则不要."

I want to do this: "If there's a module X containing a function Y then call it, otherwise don't."

我知道我可以使用 CallByName(Object, MethodName, ...) 来调用对象实例的方法或属性.

I'm aware that I can use CallByName(Object, MethodName, ...) to call a method or property of an object instance.

是否可以调用未绑定到对象的全局子/函数?

Is it possible to call a global sub/function which is not bound to an object?

//Module1
Public Sub DoSomething
End Sub

//Module2
Public Sub TriggerDoSomething
  On Error Resume Next
  CallByName2 "Module1", "DoSomething", ...
End Sub

我知道，最好重构我的代码以将 DoSomething 包装到一个类中，但目前这是不可能的，因为它会以一种不可能的方式破坏我同事的代码几个小时后修复.

I know, it would be better to refactor my code to wrap DoSomething into a class, but currently this is not possible as it would break the code of my coworkers in a way that could not be fixed in a few hours.

推荐答案

CallByName 真的会更容易一个类 - 难道你不能只用一个将调用重定向到模块的类包装模块吗?

It really would be easier to CallByName a class - can't you just wrap the module(s) with a class that redirects the calls to the module?

可以使用 FunctionDelegator 按名称调用模块中的例程.这在 Matt Curland 的优秀著作 Advanced Visual Basic 6.

It's possible to call routines in modules by name using a FunctionDelegator. This is explained in Matt Curland's excellent book Advanced Visual Basic 6.

谷歌搜索可能会发现一些使用 CallWindowProc 的技巧，但 Matt Curland 说这很危险.这几乎是对此事的最终决定:)

Googling might find you some hacks using CallWindowProc, but Matt Curland says that's dangerous. Which is pretty much the final word on the matter :)

RS Conley 的答案不使用模块，使用具有 GlobalMultiUse 实例化属性的类，您将能够使用 CallByName.如果您的代码在 DLL 而不是 EXE 中，这将起作用.RS Conley 建议在任何情况下，在 DLL 中拥有一个包含几乎所有功能的最小 EXE 会更灵活:这很可能是真的.

RS Conley's answer doesn't use a module, use a class that has a instancing property of GlobalMultiUse and you will be able to use CallByName. This will work if your code is in a DLL rather than an EXE. RS Conley suggests in any case it is more flexible to have a minimal EXE with nearly all functionality in a DLL: this may well be true.

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