alttab.py 文件源码

def get_process_image_path(proc_id):
        """
        Return the full path of the PE image of the given process ID.
        Raises a OSError exception on error.
        """
        # get process handle
        # PROCESS_QUERY_INFORMATION = 0x400
        hproc = ctypes.windll.kernel32.OpenProcess(0x400, False, proc_id)
        if not hproc:
            raise ctypes.WinError()

        # get image path
        # MAX_PATH is 260 but we're using the Unicode variant of the API
        max_length = 1024
        length = ctypes.c_ulong(max_length)
        buff = ctypes.create_unicode_buffer(max_length)
        ctypes.windll.kernel32.SetLastError(0)
        res = ctypes.windll.kernel32.QueryFullProcessImageNameW(
                                        hproc, 0, buff, ctypes.byref(length))
        error = ctypes.GetLastError()
        ctypes.windll.kernel32.CloseHandle(hproc)
        ctypes.windll.kernel32.SetLastError(error)
        if not res:
            raise ctypes.WinError()
        return buff.value