您所要求的实际上很简单:

What you asked for is actually quite easy:

{
  pid_t pid = fork();
  if (pid == 0)
  {
    const char* error_reporter_path = "./error_reporter";
    execl(error_reporter_path,
          error_reporter_path,
          (char *) 0);
    _exit(127);
  }
  else
    return pid != -1;
}

但是它不能满足您的要求. 当前工作目录与包含当前可执行文件的目录不一定是同一件事-实际上，在几乎所有情况下都不会.

but it doesn't do what you want. The current working directory is not necessarily the same thing as the directory containing the current executable -- in fact, under almost all circumstances, it won't be.

我建议您做的是将error_reporter_path设置为全局变量，并使用选项2"代码在main的开始处对其进行初始化

What I would recommend you do is make error_reporter_path a global variable, and initialize it at the very beginning of main, using your "option 2" code

     QString("%1/%2")
    .arg(QApplication::applicationDirPath())
    .arg("error_reporter").toLatin1().constData();

QString对象(不仅是它的constData)然后必须在程序的生存期内生存，但这不应该成为问题.请注意，您应该转换为UTF-8，而不是Latin1(我猜QString使用宽字符?)

The QString object (not just its constData) then has to live for the lifetime of the program, but that shouldn't be a problem. Note that you should be converting to UTF-8, not Latin1 (I guess QString uses wide characters?)