C#键盘输入 [英] c# keyboard input

问题描述

我是C#的新手，并且不熟悉OOP.

我正在将TurboC程序转换为Windows.

旧程序使用全局变量来存储用户密钥.
C#prog具有用于同一目的的静态变量.
这由重写的OnKeyDown更新.

但是，在输入通过表单菜单调用的方法时，按键将被忽略.

我担心这对我的工作方式很重要.
怀疑没有从过程编程中抓住变化.

谁能指出我正确的方向.

感谢

I am new to C# and not up to speed with OOP.

I am converting a TurboC program to Windows.

The old program used a global variable to store user key srokes.
The C# prog has a static variable for the same purpose.
This is updated by an overriden OnKeyDown.

However on entering a method, called via a form menu, key strokes are ignored.

I fear it is something fundamental in my approach.
Suspect not grasping change from procedural programming.

Can anyone point me in the right direction.

Thanks

推荐答案

我认为您需要将KeyPreview属性设置为True才能获取所有击键.

http://msdn.microsoft.com/en-us/library/system. windows.forms.form.aspx [ ^ ]

如果您的意思是您的方法执行了相当长的时间，那么这意味着不会处理用于处理应用程序消息(例如按键)的消息循环.如果要花很长时间，您还将在任务管理器中获得(不响应)".

您可以在线程中执行您的方法.最基本的方法是:

I think you need to set the KeyPreview property to True to get all keystrokes.

http://msdn.microsoft.com/en-us/library/system.windows.forms.form.aspx[^]

If you mean that your method executes for quite some time, then this means that the message loop that deals with application messages (like a keystroke) isn''t handled. If it would take to long, you would also get the "(not responding)" in the taskmanager.

You could execute your method in a thread. The most basic way to do this is:

using System.Threading;
// ...
new Thread (new ThreadStart (SomeObject.SomeMethod)).Start();

上面的代码未维护对线程的引用，但这只是一个简单的示例.

这是一些额外的参考:
http://www.yoda.arachsys.com/csharp/threads/ [ http://www.yoda.arachsys.com/csharp/threadstart.html [ ^ ]

同样重要的是要知道要从线程进行屏幕更新，必须使用Invoke:
http://msdn.microsoft.com/en-us/library/zyzhdc6b.aspx [ ^ ]

有关如何控制线程的一些信息:
http://msdn.microsoft.com/en-us/library/7a2f3ay4% 28VS.80％29.aspx [ ^ ]

您也可以在没有线程的情况下使用过多的Application.DoEvents(); 来膨胀方法，以确保处理消息循环.但是，这非常危险且容易出错.每个保存人员都会建议您不要使用此骇客...因此，请注意！

祝你好运！

The code above doesn''t maintain a reference to the thread, but it''s just a simple example.

Here is some extra reference:
http://www.yoda.arachsys.com/csharp/threads/[^]

http://www.yoda.arachsys.com/csharp/threadstart.html[^]

It is also important to know that Invoke must be used if you would like to do some screen updating from a thread:
http://msdn.microsoft.com/en-us/library/zyzhdc6b.aspx[^]

Some info on how to control the thread:
http://msdn.microsoft.com/en-us/library/7a2f3ay4%28VS.80%29.aspx[^]

You could also do without threads and bloat your methods with an excessive amount of Application.DoEvents(); to ensure the message loop is handled. This is however quite dangerous and error prone. Every save person will advise against the use of this hack... so, be warned!

Good luck!

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