如何阻止控制台窗口立即关闭GNAT-GPS [英] How to stop console window from closing immediately | GNAT - GPS

问题描述

我有Ada程序，可以使用GNAT-GPS完美运行和编译。当我运行其exe文件并提供用户输入时，而不是说按任意键继续，该exe将立即关闭。

I have Ada program that runs and compile perfectly using GNAT - GPS. When I run its exe file and provide user input then instead of saying "Press any key to continue", the exe closes immediately.

我已经在网上大量搜索它，但是我只使用system（'pause'）找到了与c / c ++ / visual studio控制台窗口有关的信息；或Console.Readline（）。

I have searched for it online alot but i only found info related to c/c++/visual studio console window using system('pause'); OR Console.Readline().

在Ada lanaguage中是否可以解决此问题？

Is there any way around for this in Ada lanaguage?

推荐答案

除了使用 Get_Line 或 Get 外，还可以使用 noreferrer> Ada.Text_IO 包。区别在于 Get_Line 和 Get 将继续读取用户输入，直到< Enter> 已被命中，而 Get_Immediate 仅在将标准输入连接到交互式设备（例如键盘）时按下单个键之前才会阻塞

Apart from using Get_Line or Get, you can also use Get_Immediate from the Ada.Text_IO package. The difference is that Get_Line and Get will continue to read user input until <Enter> has been hit, while Get_Immediate will block only until a single key has been pressed when standard input is connected to an interactive device (e.g. a keyboard).

这里是一个例子：

with Ada.Text_IO; use Ada.Text_IO;

procedure Main is
begin

   --  Do some interesting stuff here...   

   declare
      User_Response : Character;
   begin
      Put_Line ("Press any key to continue...");
      Get_Immediate (User_Response);
   end;

end Main;

注释

• 您应该在交互式终端（Bash，PowerShell等）中运行该程序，以实际看到 Get_Immediate 的效果。当您从GPS内运行程序时，仍然必须按Enter键才能实际退出程序。

• You should run the program in an interactive terminal (Bash, PowerShell, etc.) to actually see the effect of Get_Immediate. When you run the program from within GPS, then you still have to press enter to actually exit the program.

这可能太多了，但是我认为表示 Get 仍然等待按下< Enter> ，因为它使用的是 fgetc （请参见此处和此处）。函数 fgetc 从C流中读取。 C流最初是为交互设备的行缓冲（源）。

This might be too much detail, but I think that Get still waits for <Enter> to be pressed because it uses fgetc from the C standard library (libc) under the hood (see here and here). The function fgetc reads from a C stream. C streams are initially line-buffered for interactive devices (source).

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