import sys
import subprocess
import tempfile
import os


def open_with_system_viewer(pdf_data):
    with tempfile.NamedTemporaryFile(suffix='.pdf', delete=False) as f:
        f.write(pdf_data)
        temp_path = f.name

    # 打开系统默认阅读器
    if sys.platform.startswith('darwin'):  # macOS
        subprocess.call(('open', temp_path))
    elif os.name == 'nt':  # Windows
        os.startfile(temp_path)
    elif os.name == 'posix':  # Linux
        subprocess.call(('xdg-open', temp_path))