c ++ CALLBACK函数类型

Question

I'm trying to create something like MsgProc in Win32. When they declare the MsgProc function they have the CALLBACK type before it. So, all I'm trying to is create my own messsage function that calls my function to process the messages. It is basically the same thing when messages getting sent and processed. My question is how can i create the Same process?. An example would be great.

Answer 1

Other than the classics function pointers and function objects you may be interested by the new C++0x lambdas.

Here's an example of passing a lambda to a timer function.

#include <windows.h>
#include <iostream>
#include <functional>

void onInterval(DWORD interval, std::function<void ()> callback) {
  for (;;) {
    Sleep(interval);
    callback();
  }
}

int main() {
  onInterval(1000, []() {std::cout<<"Tick! ";});
}

Answer 2

If you're in C++, just use a function pointer in your class:

http://www.newty.de/fpt/fpt.html

Answer 3

如果你可以使用Boost，我肯定会给Boost.Signals一个机会，它们以干净和安全的方式提供你正在寻找的功能（ Boost.Signals2甚至以线程安全的方式。）