使用Turbo C ++测试是否按下了键 [英] Test if key is pressed using Turbo C++

问题描述

我想知道如何使用Turbo C ++代码测试是否按下了按键移位，ctrl和alt.

I want to know how to test whether the key shift, ctrl and alt are pressed or not using Turbo C++ code.

推荐答案

检查0x40处的字节: 17-它包含DOS程序中的shift状态，alt状态和ctrl键状态-如果您使用的是Turbo C，我想您正在写.我不记得这些是什么了，所以您"按下各种contol/sh * t/alt键时，将不得不编写一个小程序来输出字节.

要访问此字节，您需要一个远指针:

unsigned char far * key_state_bye =(unsigned char far *)0x00400017;

我记不清具有const功能的Turbo C了，但是如果它可以使const值成功，我也可以使其设为const，以防止发生意外.

干杯，

Ash

Check the byte at 0x40:17 - it contains the shift state, alt state and ctrl key state in a DOS program - which I presume you''re writing if you''re using Turbo C. I can''t remember what the bits are so you''ll have to write a little program to output the byte there when you''ve pressed various contol/sh*t/alt keys.

To access this byte you need a far pointer:

unsigned char far *key_state_bye = (unsigned char far *)0x00400017;

I can''t remember how const capable Turbo C was but if it can manage to make the value const I''d make it const as well to prevent accidents.

Cheers,

Ash

您可以尝试使用kbhit()函数(尽管我不确定是否会成功).为什么不使用更新的开发工具，例如Visual C++ Express Edition(免费)?
:)

You may try the kbhit() function (though I''m not sure it will make the trick). Why dont'' you use a more updated development tool, like, for instance Visual C++ Express Edition (it''s free)?
:)

抱歉，Ash和CP有点脱节. Turbo C plusplus 是21世纪的产品. (将其视为Borland C ++ Studio的"Express"版本.)如果使用的是VCL，则KeyDown事件会将ctrl/alt/shift状态作为参数.如果要编写控制台应用程序，请查看GetKeyState()和相关功能上的Turbo C ++帮助. (还有另一种方法，但是我已经忘记了...)

Sorry to say this, but Ash and CP are a little out of touch. Turbo Cplusplus is a 21st Century product. (Consider it the "Express" edition of Borland C++ Studio.) If you are using VCL, then the KeyDown event includes the ctrl/alt/shift state as an argument. If you are writing a console application, then have a look at the Turbo C++ help on GetKeyState() and related functions. (There is another way to do it, but I''ve forgotten...)

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