C++ 使用 ncurses 创建一个函数来检查 unix 中的按键
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Create a function to check for key press in unix using ncurses
提问by Mimsy Hyman
I have been looking for an equivalent to kbhit() and I have read several forums on this subject, and the majority seems to suggest using ncurses.
我一直在寻找与 kbhit() 等效的方法，并且我已经阅读了几个关于这个主题的论坛，大多数似乎都建议使用 ncurses。
How should I go about checking if a key is pressed in c++ using ncurses.
我应该如何检查是否使用 ncurses 在 C++ 中按下了某个键。
The function getch() provided by ncurses reads character from the window. I would like to write a function that only checks if there is a key press and then I want to do getch().
ncurses 提供的函数 getch() 从窗口读取字符。我想编写一个函数，只检查是否有按键按下，然后我想做 getch()。
Thanks in advance.
提前致谢。
回答by Matthew Slattery
You can use the nodelay()function to turn getch()into a non-blocking call, which returns ERRif no key-press is available. If a key-press is available, it is pulled from the input queue, but you can push it back onto the queue if you like with ungetch().
您可以使用该nodelay()函数转换getch()为非阻塞调用，ERR如果没有可用的按键，则返回。如果按键可用，它将从输入队列中拉出，但如果您愿意，可以将其推回到队列中ungetch()。
#include <ncurses.h>
#include <unistd.h> /* only for sleep() */
int kbhit(void)
{
int ch = getch();
if (ch != ERR) {
ungetch(ch);
return 1;
} else {
return 0;
}
}
int main(void)
{
initscr();
cbreak();
noecho();
nodelay(stdscr, TRUE);
scrollok(stdscr, TRUE);
while (1) {
if (kbhit()) {
printw("Key pressed! It was: %d\n", getch());
refresh();
} else {
printw("No key pressed yet...\n");
refresh();
sleep(1);
}
}
}
