如何使用GTK PrintOperation打印图像

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, GdkPixbuf

print_operation = Gtk.PrintOperation()

print_settings = print_operation.get_print_settings()
print_settings.set_orientation(Gtk.PageOrientation.PORTRAIT)  # 设置打印方向为纵向
print_settings.set_paper_size(Gtk.PaperSize.new_custom("custom", "Custom", 100, 100), Gtk.Unit.MM)  # 设置纸张大小为自定义大小

def print_image(operation, context):
    cr = context.get_cairo_context()
    pixbuf = GdkPixbuf.Pixbuf.new_from_file("image.png")  # 替换为你的图像文件路径
    Gdk.cairo_set_source_pixbuf(cr, pixbuf, 0, 0)
    cr.paint()

print_operation.connect("draw-page", print_image)

result = print_operation.run(Gtk.PrintOperationAction.PRINT_DIALOG, None)
if result == Gtk.PrintOperationResult.ERROR:
    print("打印出错")