相当于Windows getch（）Mac / Linux崩溃 [英] Equivalent to Windows getch() for Mac/Linux crashes

问题描述

我使用 getch（），我的应用程式立即崩溃。包括执行时：

I am using getch() and my app crashes instantly. Including when doing:

int main()
{
    getch();
}

我找不到链接，但据说问题是，它需要关闭缓冲或者沿着这些线路奇怪，我仍然希望 cout 与跨平台代码一起工作。

I can't find the link but supposedly the problem is that it needs to turn off buffering or something strange along those lines, and I still want cout to work along with cross platform code.

我被告知要使用 std :: cin.get（），但我希望应用程序退出时，按下一个键，而不是当用户键入字母或数字，然后按Enter键退出。

I was told to use std::cin.get(), but I'd like the app to quit when a key is pressed, not when the user typed in a letter or number then press enter to quit.

这有什么功能吗？代码必须在Mac（my os）和Windows下运行。

Is there any function for this? The code must work under Mac (my os) and Windows.

链接/编译不是发布;在XCode中包含< curses.h> 并链接到 -lcurses ，而Windows使用 c>


Linking/compiling is not an issue; I include <curses.h> and link with -lcurses in XCode, while Windows uses <conio.h>.

推荐答案

< curses.h> 以查看 getch（）函数是什么？

Have you looked in <curses.h> to see what the getch() function does?

提示：OSX和Linux与Windows不同。

Hint: OSX and Linux are not the same as Windows.

具体来说，作为< curses.h> ，我们找到：

Specifically, as a macro in <curses.h>, we find:

#define getch() wgetch(stdscr)

现在，在您的系统上，出现了一个实际的函数 getch（） curses库，但它期望设置 stdscr ，这是由curses初始化函数（ initscr（）和亲戚），这是明智的做不到你的代码。因此，您的代码通过在正确的初始化完成之前调用curses例程来调用未定义的行为，从而导致崩溃。

Now, there appears, on your system, to be an actual function getch() in the curses library, but it expects stdscr to be set up, and that is done by the curses initialization functions (initscr() and relatives), and that is signally not done by your code. So, your code is invoking undefined behaviour by calling curses routines before the correct initialization is done, leading to the crash.

（来自dmckee的好提示 - line out of acidzombie24，这很重要。）

(Good hint from dmckee - it helped get the link line out of acidzombie24, which was important.)

为了得到一个单一的关键笔划可以被读取和程序终止干净的点，你必须做一个在Unix上很好的工作（OSX，Linux）。你必须陷阱终端的初始状态，安排一个 atexit（）函数 - 或一些类似的机制 - 恢复终端的状态，改变终端从cooked模式转换为raw模式，然后调用一个函数来读取一个字符（可能只是 read（0，& c，1）），然后退出。

To get to a point where a single key-stroke can be read and the program terminated cleanly, you have to do a good deal of work on Unix (OSX, Linux). You would have to trap the initial state of the terminal, arrange for an atexit() function - or some similar mechanism - to restore the state of the terminal, change the terminal from cooked mode into raw mode, then invoke a function to read a character (possibly just read(0, &c, 1)), and do your exit. There might be other ways to do it - but it certainly will involve some setup and teardown operations.

一本可能会有帮助的书是 Advanced Unix Programming，2nd Edn by Mark Rochkind;它涵盖了所需级别的终端处理。或者，您可以正确使用< curses.h> - 这将比滚动自己的解决方案更简单，并且可能更可靠。

One book that might help is Advanced Unix Programming, 2nd Edn by Mark Rochkind; it covers terminal handling at the level needed. Alternatively, you can use <curses.h> properly - that will be simpler than a roll-your-own solution, and probably more reliable.

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