C++ - 指向类方法的指针

发布于 2024-08-08 16:57:09 字数 369 浏览 6 评论 0原文

我必须设置一个指向库函数 (IHTMLDocument2::write) 的指针，该函数是 IHTMLDocument2 类的方法。（出于好奇：我必须用 Detours 来挂钩该函数）

我不能直接执行此操作，因为类型不匹配，我也不能使用强制转换（reinterpret_cast<> 这是“正确的”一”afaik 不起作用）

这就是我正在做的：

HRESULT (WINAPI *Real_IHTMLDocument2_write)(SAFEARRAY *) = &IHTMLDocument2::write

感谢您的帮助！

原文

I have to set up a pointer to a library function (IHTMLDocument2::write) which is a method of the class IHTMLDocument2. (for the curious: i have to hook that function with Detours)

I can't do this directly, because of type mismatch, neither can I use a cast (reinterpret_cast<> which is the "right one" afaik doesn't work)

Here's what I am doing:

HRESULT (WINAPI *Real_IHTMLDocument2_write)(SAFEARRAY *) = &IHTMLDocument2::write

Thanks for your help!

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满意归宿 2024-08-15 16:57:09

指向函数的指针具有以下类型：

HRESULT (WINAPI IHTMLDocument2::*)(SAFEARRAY*)

如您所见，它由其类名限定。它需要一个类的实例来调用（因为它不是静态函数）：

typedef HRESULT (WINAPI IHTMLDocument2::*DocumentWriter)(SAFEARRAY*);

DocumentWriter writeFunction = &IHTMLDocument2::write;

IHTMLDocument2 someDocument = /* Get an instance */;
IHTMLDocument2 *someDocumentPointer = /* Get an instance */;

(someDocument.*writefunction)(/* blah */);
(someDocumentPointer->*writefunction)(/* blah */);

The pointer to function has the following type:

HRESULT (WINAPI IHTMLDocument2::*)(SAFEARRAY*)

As you can see, it's qualified with it's class name. It requires an instance of a class to call on (because it is not a static function):

typedef HRESULT (WINAPI IHTMLDocument2::*DocumentWriter)(SAFEARRAY*);

DocumentWriter writeFunction = &IHTMLDocument2::write;

IHTMLDocument2 someDocument = /* Get an instance */;
IHTMLDocument2 *someDocumentPointer = /* Get an instance */;

(someDocument.*writefunction)(/* blah */);
(someDocumentPointer->*writefunction)(/* blah */);

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