有没有一种方法可以检测是否已按下某个键? [英] Is there a way to detect if a key has been pressed?

问题描述

我正在Windows计算机上的cygwin中编译和执行我的程序.我对C没有足够的经验，但是我想提供一种在不提示用户的情况下(例如我)检测是否已按下某个键的方法.我的伪代码具有理想的功能，如下所示.

I am compiling and executing my programs in cygwin on a windows computer. I am quite inexperienced in C but I would like a way to detect if a key has been pressed without prompting the user(e.g me). My pseudo code with desirable functions is shown below.

char ch;
while(1){
    if(KeyBeenPressed()){
    //a key has been pressed before getting here
        ch=getKeyPressed();
        if(ch=='0'){
            printf("you have pressed 0");
        }
        else{
            printf("you did't press key 0");
        }
    }

//do other stuff
} 

下面显示了我自己在搜索网络后解决此问题的尝试.

And my own try to solving this after searching the web is shown below.

#include <stdio.h>
#include <conio.h>
char ch;
void main(){
    while(1){
        if(kbhit()){ //kbhit is 1 if a key has been pressed
            ch=getch();
            printf("pressed key was: %c", ch);
        }
    }
}

此代码的问题是找不到conio.h文件(而且我还没有找到解决此问题的任何其他方法).显然，gcc编译器无法处理conio.h(我已将链接附加到它所在的位置). http://www.programmingsimplified.com/c/conio.h

A problem with this code is that the conio.h file can't be found(and I haven't found any other way to solve this). Apparently gcc compilers can't handle conio.h(I have attached the link to were it stood). http://www.programmingsimplified.com/c/conio.h

所以我想知道你们中是否有人知道一种方法来检测C中是否已按下某个键，所以我也想最好以char形式检索该按下的键(我打算在此应用程序中使用0-9) .重要的是该程序不能等到按下一个键.

So I wonder if any of you guys know a way to detect if a key has been pressed in C, I would also like to retrieve the pressed key preferably in a char (I plan on using 0-9 for this application). The important thing is that the program can't wait until a key is pressed.

我很感谢能解决这个问题的任何建议！ 最好的祝福 亨里克

I am thankful for any suggestions that could solve this! Best regards Henrik

推荐答案

我对kbhit()使用以下函数.它可以在Ubuntu上的g ++编译器上正常工作.

I use the following function for kbhit(). It works fine on g++ compiler in Ubuntu.

#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
int kbhit(void)
{
  struct termios oldt, newt;
  int ch;
  int oldf;

  tcgetattr(STDIN_FILENO, &oldt);
  newt = oldt;
  newt.c_lflag &= ~(ICANON | ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &newt);
  oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);

  ch = getchar();

  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
  fcntl(STDIN_FILENO, F_SETFL, oldf);

  if(ch != EOF)
  {
    ungetc(ch, stdin);
    return 1;
  }

  return 0;
}

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