java - Java中如何检查进程是否有错误？

Question

我正在 JavaFx 中制作 IDE 相关程序，运行 C、C++、Python 等代码。 当用户代码中存在任何编译时/运行时错误时，它会在弹出窗口中显示一些与堆栈溢出相关的错误的答案。但是，我怎么知道是否有错误呢？

我的代码片段在这里 -

public BufferedReader buildCode(File file)
    {
        String dirname = file.getParent();
        String filePath = file.getPath();
        String fileName = file.getName();
        String objectFileName = FilenameUtils.removeExtension(fileName);
        String command = "gcc " + filePath + " -o " + dirname + "/" + objectFileName;
        BufferedReader stdInput;// = new BufferedReader(null);
        try
        {
            Process process = Runtime.getRuntime().exec(command);
            stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
            BufferedReader stdErr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
            String compileResult;
            while ((compileResult = stdInput.readLine()) != null)
                System.out.println(compileResult);

            while ((compileResult = stdErr.readLine()) != null)
                System.out.println(compileResult);
            return stdInput;
        }
        catch (IOException io)
        {
            //noinspection ThrowablePrintedToSystemOut
            System.out.println(io);
            return null;
        }
    }

我想我必须做一些事情，比如检查stdErr，无论它是否为空。但是，我不确定是否没有任何错误，它会在 stdErr 中分配 EOF。

Answer 1

无需解析进程的输出。海湾合作委员会will return non-zero exit code如果出现问题:

Normally the gcc program exits with the code of 1 if any phase of the compiler returns a non-success return code. If you specify -pass-exit-codes, the gcc program instead returns with the numerically highest error produced by any phase returning an error indication. The C, C++, and Fortran front ends return 4 if an internal compiler error is encountered.

因此，您只需检查退出代码即可:

final Process process = Runtime.getRuntime().exec(command);

process.waitFor();

final result = process.exitValue();

if(0 != result) {
  ...
}