C++ 在 Mac 上查找执行路径

Question

假设我的可执行文件位于 Mac OSX 上的 /Users/test_user/app，我从 /Users/test_user/Desktop/run_app 运行它:

Desktop run_app$ /Users/test_user/app/exec 

在我的 C++ 代码中，如何找到可执行文件所在位置的路径(在本例中为 /users/test_user/app)？我需要在我的代码中引用此路径中的一些其他文件，并且不想在代码中放置绝对路径，因为某些用户可能会将文件夹放在不同的位置。

Answer 1

man 3 dyld 说:

_NSGetExecutablePath() copies the path of the main executable into the buffer buf. The bufsize parameter should initially be the size of the buffer. This function returns 0 if the path was successfully copied. It returns -1 if the buffer is not large enough, and * bufsize is set to the size required. Note that _NSGetExecutablePath() will return "a path" to the executable not a "real path" to the executable. That is, the path may be a symbolic link and not the real file. With deep directories the total bufsize needed could be more than MAXPATHLEN.

#include <mach-o/dyld.h>
#include <limits.h>

int main(int argc, char **argv)
{
  char buf [PATH_MAX];
  uint32_t bufsize = PATH_MAX;
  if(!_NSGetExecutablePath(buf, &bufsize))
    puts(buf);
  return 0;
}