如何在D Programming Language + Tango中获取单键击中？

I read this article and try to do the exercise in D Programming Language, but encounter a problem in the first exercise.

我读了这篇文章并试着用D编程语言练习,但在第一次练习中遇到了问题。

(1) Display series of numbers (1,2,3,4, 5....etc) in an infinite loop. The program should quit if someone hits a specific key (Say ESCAPE key).

(1)在无限循环中显示数字序列(1,2,3,4,5 ......等)。如果有人按特定键(Say ESCAPE键),程序应该退出。

Of course the infinite loop is not a big problem, but the rest is. How could I grab a key hit in D/Tango? In tango FAQ it says use C function kbhit() or get(), but as I know, these are not in C standard library, and does not exist in glibc which come with my Linux machine which I use to programming.

当然,无限循环不是一个大问题,但其余的是。我如何才能在D / Tango中获得重点?在tango FAQ中它说使用C函数kbhit()或get(),但据我所知,这些不在C标准库中,并且不存在于我用于编程的Linux机器中的glibc中。

I know I can use some 3rd party library like ncurses, but it has same problem just like kbhit() or get(), it is not standard library in C or D and not pre-installed on Windows. What I hope is that I could done this exercise use just D/Tango and could run it on both Linux and Windows machine.

我知道我可以使用像ncurses这样的第三方库,但它有像kbhit()或get()一样的问题,它不是C或D中的标准库,也没有预装在Windows上。我希望我能完成这个练习只使用D / Tango,并且可以在Linux和Windows机器上运行它。

How could I do it?

我怎么能这样做?

5 个解决方案

#1

Here's how you do it in the D programming language:

以下是您使用D编程语言的方法:

    import std.c.stdio;
    import std.c.linux.termios;

    termios  ostate;                 /* saved tty state */
    termios  nstate;                 /* values for editor mode */

    // Open stdin in raw mode
    /* Adjust output channel        */
    tcgetattr(1, &ostate);                       /* save old state */
    tcgetattr(1, &nstate);                       /* get base of new state */
    cfmakeraw(&nstate);
    tcsetattr(1, TCSADRAIN, &nstate);      /* set mode */

   // Read characters in raw mode
    c = fgetc(stdin);

    // Close
    tcsetattr(1, TCSADRAIN, &ostate);       // return to original mode

#2

kbhit is indeed not part of any standard C interfaces, but can be found in conio.h.

kbhit确实不是任何标准C接口的一部分,但可以在conio.h中找到。

However, you should be able to use getc/getchar from tango.stdc.stdio - I changed the FAQ you mention to reflect this.

但是,您应该能够使用tango.stdc.stdio中的getc / getchar - 我更改了您提到的常见问题以反映这一点。

#3

D generally has all the C stdlib available (Tango or Phobos) so answers to this question for GNU C should work in D as well.

D通常具有所有可用的C stdlib(Tango或Phobos),因此对于GNU C的这个问题的答案也应该在D中工作。

If tango doesn't have the needed function, generating the bindings is easy. (Take a look at CPP to cut through any macro junk.)

如果探戈没有所需的功能,生成绑定很容易。 (看一看CPP来消除任何宏观垃圾。)

#4

Thanks for both of your replies.

感谢您的回复。

Unfortunately, my main development environment is Linux + GDC + Tango, so I don't have conio.h, since I don't use DMC as my C compiler.

不幸的是,我的主要开发环境是Linux + GDC + Tango,所以我没有conio.h,因为我没有使用DMC作为我的C编译器。

And I also found both getc() and getchar() is also line buffered in my development environment, so it could not achieve what I wish I could do.

我还发现getc()和getchar()在我的开发环境中也是行缓冲的,所以它无法达到我希望的能力。

In the end, I've done this exercise by using GNU ncurses library. Since D could interface C library directly, so it does not take much effort. I just declare the function prototype that I used in my program, call these function and linking my program against ncurses library directly.

最后,我使用GNU ncurses库完成了这个练习。由于D可以直接连接C库,因此不需要花费太多精力。我只是声明我在程序中使用的函数原型,调用这些函数并直接将我的程序与ncurses库链接。

It works perfectly on my Linux machine, but I still not figure out how could I do this without any 3rd party library and could run on both Linux and Windows yet.

它在我的Linux机器上运行得很好,但是我仍然不知道如果没有任何第三方库我怎么能这样做,并且可以在Linux和Windows上运行。

import tango.io.Stdout;
import tango.core.Thread;

// Prototype for used ncurses library function.
extern(C)
{
    void * initscr();
    int cbreak ();
    int getch();
    int endwin();
    int noecho();
}

// A keyboard handler to quit the program when user hit ESC key.
void keyboardHandler ()
{
    initscr();
    cbreak();
    noecho();
    while (getch() != 27) {
    }
    endwin();
}

// Main Program
void main ()
{
    Thread handler = new Thread (&keyboardHandler);
    handler.start();

    for (int i = 0; ; i++) {
        Stdout.format ("{}\r\n", i).flush;

        // If keyboardHandler is not ruuning, it means user hits
        // ESC key, so we break the infinite loop.
        if (handler.isRunning == false) {
            break;
        }
    }

    return 0;
}

#5

As Lars pointed out, you can use _kbhit and _getch defined in conio.h and implemented in (I believe) msvcrt for Windows. Here's an article with C++ code for using _kbhit and _getch.

正如Lars所指出的,你可以使用在conio.h中定义的_kbhit和_getch,并在(我相信)msvcrt for Windows中实现。这是一篇包含使用_kbhit和_getch的C ++代码的文章。

#1