使用Printf（）在控制台窗口中调试activex控件
文章来自：
http://www.codeproject.com/Articles/11420/Printf-debugging-in-a-console-window-from-within-a
Introduction
OK, here's the deal... In the process of developing an ActiveX control for inclusion in a browser, I had developed a need to watch a large amount of data. It became very cumbersome to use the standard breakpoint debugging, and to make matters worse, the control
was misbehaving on a remote machine.
在开发浏览器使用的activex控件的过程中，我需要监测许多数据。使用标准断点会变得很笨重，而且事情会变得更糟糕，控件在远程的机器上会表现异常。
Needing to be able to see the data easily, I decided to see if it was possible to create a console window from within the control. A web search didn't turn up anything as far as I could see so I decided to try a quick test.
我所需要的是很容易监测数据，我决定看下是否有可能从控件中创建一个控制台窗口。我在网上并没有找到答案，决定自己试验一下。
As it turns out, it was quite simple to do. To do printf() debugging from within a control, all you need to do is modify
your OnCreate() method as follows:
结果证明，它是很容易实现的。为了可以在控件中使用printf()，你所需要的就是按照如下修改oncreate（）：
LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
// TODO : Add Code for message handler.
// Call DefWindowProc if necessary.
/* create a seperate console window for
printf (print, println and debug) output */
AllocConsole();
freopen ("CONOUT$", "w", stdout );
return 0;
}
You'll also need to include the appropriate headers <stdio.h> and you should now be able to use printf() from
anywhere in your code.
你应该包括<stdio.h>并且可以在任何地方使用printf()函数。
There are certainly other methods of tracing output... but this is guaranteed to be available and viewable on machines that don't have any tools installed.
应该有其他方法跟踪输出，但是这个可以确保不需要其他工具就能使用。
Note: although I haven't done it, it should also be possible to remap stdin and take input from the console window
should you need to implement a simple debug console.
注释：虽然我没有试验，它应该可以重映射stdin并且可以从控制台窗口获取输入信息。
Just another one for the toolkit... use it as you will.