在Matlab exe中使用标准io stream:stdin和stdout [英] Using standard io stream:stdin and stdout in a matlab exe

问题描述

问题

我希望它在正在运行(已编译)的Matlab可执行文件中监听"标准输入流.

I want it to 'listen' to the standard input stream in a running (compiled) Matlab executable.

我相信这是用c或类似语言完成的方式:

This is how I believe it is done in c or a similar language:

#include stdio.h
fgets(line, 256, stdin)

或更详细地说，它可以这样使用:

Or more elaborately, it it can be used as such:

if (!fgets(line, 256, stdin))
    return;
if (line[0] == '\n')
    continue;
sscanf(line, "%s", command);

答案

为了完整起见，我将完整保留背景和注释，但是在Amro和EitanT的帮助下，我设法将其解决了.

For completeness I will leave the background and notes intact, but with the help of Amro and EitanT I have managed to work it out.

背景

我已经找到了其他语言的用法，并且这里是编译过程的一些说明.

I have found how to do this in other languages, and here are some instructions for the compilation process.

但是，我在任何地方都没有找到如何聆听" Matlab中的输入的方法. 我最接近的是此说明 Octave中类似于C的IO，但是在MATLAB中寻找解决方案时，我无法在这方面取得进展.

However, I have not found anywhere how to 'listen' to the input in Matlab. The closest I have come is this description of C-like IO in Octave, but I cannot make progress with this as I looking for a solution in MATLAB.

请注意，无法更改或包装通过流发送数据的程序，并且我更喜欢纯MATLAB解决方案，而不是包装整个程序.如果我要用另一种语言从MATLAB调用一个琐碎的函数，那没关系.

Note that altering or wrapping the program that sends the data over the stream is not possible, and that I would prefer a pure MATLAB solution rather than wrapping my entire program. If I were to call a trivial function from MATLAB in a different language that would be ok.

我尝试了什么?

我尝试了在命令窗口中尝试了一些功能，例如fgets(0)(fid = 0似乎是与stdin相对应的ID(如@EitanT所述，在尝试fopen(0) ))，但它只会返回:

I tried a few functions from the command window like fgets(0) (fid = 0 seems to be the id corresponding to stdin (as mentioned by @EitanT and seen when trying fopen(0)) )but it just returns:

Operation is not implemented for requested file identifier.

我还考虑过使用MATLAB中的选项来调用系统命令或执行java/perl命令，但是到目前为止还算不上运气.我也不确定这些在编译后是否仍然有效.

I have also considered using the option in MATLAB to invoke system commands or execute java / perl commands, but so far without luck. I am also not sure whether these would still work after compilation.

此外，当我通过cmd打开程序时，我尝试使用input('prompt','s')可以正常工作，但是在按Enter键之前什么也没做. (当然，我所听的程序永远不会执行，在最佳情况下，我可以在每一行的末尾得到\n.)

Furthermore I attempted to use input('prompt','s') this works when I open the program via cmd, but does not do anything until I hit enter. (Which the program that I listen to of course will never do, in the best case I can get \n at the end of each line).

我还从

I also tried out waitinput from File Exchange but I think this is a dead end as it did not catch anything and seems to perform quite poorly.

注释

1. 我正在使用Windows 7和MATLAB 2012b.
2. 我在文件交换上找到了popen ，但是该功能似乎不可用对于Windows.
3. 当我只键入'show me'之类的内容时，它会正确发送到标准输出流.

1. I am using Windows 7 and MATLAB 2012b.
2. I found popen on File Exchange but that does not seem to be available for Windows.
3. When I simply type something like 'show me' this is properly sent to the standard output stream.

推荐答案

事实证明，input读取标准输入流.

It turns out that input reads the standard input stream.

之所以无法收集我的输入，是因为我按如下方式使用它:

The reason why I failed to collect my inputs, is because I was using it as follows:

input('prompt','s')

结果将字符串'prompt'发送到了调用我的应用程序的程序，并且由于它认为这是无效的响应/请求，因此未发送任何内容.

As a result the string 'prompt' was sent to the program calling my application, and as it considered this an invalid response/request it did not send anything.

我已经成功制作了一个小型测试程序，与我之前怀疑的不同，发送命令后其他应用程序不会按Enter键不是问题.

I have succeeded in making a small test program, and unlike I suspected before it is NOT a problem that the other application doesn't hit enter after sending a command.

一般解决方案

这是我当前设置的方式，

This is the way I have my current setup,

while 1
   stdin = input('','s'); % Note the empty first argument
   if ~isempty(stdin)
    stdout = process_input(stdin);
    stdout % Displaying the result (And thus sending it to stdout)
   end
end

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