通过Java与C ++进程进行通信

问题描述：

首先，我在网站上看到有关此问题的一些问题，但没有找到解决我问题的答案.

First, I saw a few Q's about this issue in the site, but didn't see any answer that solve my problem.

我有一个用Java编写的程序，它调用了一个用C ++编写的cmd程序. (这是一个假设，因为我没有实际的来源)我知道C ++程序的预期I/O，在cmd中它是两行输出，然后等待字符串输入. 我知道程序的第一行输出是通过错误流，并且我正确地接收了它(这是预期的)，但是我没有得到错误或输入流的第二行. 我试图在第一行(错误行)之后立即写入程序，但没有卡住，但是没有响应. 我尝试为每个流使用3个不同的线程，但同样，在第一行之后输入/错误流中什么也没收到，并且程序对通过输出流进行写入没有响应.

I have a program written in Java and it calls a cmd program written in C++. (this is an assumption since I don't have the actual source) I know the expected I/O of the C++ program, in the cmd it is two lines of output and then it waits for string input. I know that the first output line of the program is through error stream, and I receive it properly (this is expected), but I don't get the second line in error or input stream. I tried to write to the program right after the first line ( the error line) and didn't got stuck, but there was no response. I tried using 3 different threads, for each stream, but again, nothing was received in input/error stream after the first line, and the program didn't respond to writing through output stream.

我的初始值设定项是:

Process p = Runtime.getRuntime().exec("c:\\my_prog.exe");
BufferedReader err = new BufferedReader(new InputStreamReader(p.getErrorStream()));
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedWriter output = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));

是否完全有可能，或者取决于C ++程序?

Is it possible at all or maybe it depends on the C++ program?

谢谢， Binyamin

Thanks, Binyamin

答

这是我在Java中执行任何命令行的方式.此命令行可以执行任何程序:

Here is how I execute any command line in Java. This command line may execute any program:

private String executionCommandLine(final String cmd) {

    StringBuilder returnContent = new StringBuilder();
    Process pr;
    try {
        Runtime rt = Runtime.getRuntime();
        pr = rt.exec(cmd);

        BufferedReader input = new BufferedReader(new InputStreamReader(pr.getInputStream()));

        String line = null;

        while ((line = input.readLine()) != null) {
            returnContent.append(line);
        }
        input.close();
        LOG.debug(returnContent.toString());

        // return the exit code
        pr.waitFor();
    } catch (IOException e) {
        LOG.error(e.getMessage());
        returnContent = new StringBuilder();
    } catch (InterruptedException e) {
        LOG.error(e.getMessage());
        returnContent = new StringBuilder();
    }

    return returnContent.toString();

}

通过Java与C ++进程进行通信

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