长图优化，防止出错

plugins/douyin_parser/main.py

@@ -154,14 +154,15 @@ class DouyinParserPlugin(MessagePluginInterface):
                         img_bytes_list.append(b)
                 if not img_bytes_list:
                     return False, "下载图片失败"
-                merged = self._merge_images_vertical(img_bytes_list, 1242)
+                merged_pages = self._merge_images_vertical_paged(img_bytes_list, 1242, 18000)
-                if not merged:
+                if not merged_pages:
                     return False, "图片合并失败"
                 title = media_info.get('title') or ""
                 if len(title) > 0:
                     await self.bot.send_text_message((roomid if roomid else sender), title)
-                await self.bot.send_image_message((roomid if roomid else sender), merged)
+                for page in merged_pages:
-                return True, "发送合并图片成功"
+                    await self.bot.send_image_message((roomid if roomid else sender), page)
+                return True, f"发送合并图片成功（{len(merged_pages)}页）"
             else:
                 video_url = media_info.get('url', '')
                 title = media_info.get('title', '无标题')
@@ -438,3 +439,47 @@ class DouyinParserPlugin(MessagePluginInterface):
             return output.getvalue()
         except Exception:
             return None
+
+    def _merge_images_vertical_paged(self, images: List[bytes], target_width: int = 1242, max_total_height: int = 18000) -> Optional[List[bytes]]:
+        try:
+            outputs: List[bytes] = []
+            current_images: List[Image.Image] = []
+            current_height = 0
+            for b in images:
+                try:
+                    img = Image.open(io.BytesIO(b))
+                    if img.mode in ("RGBA", "P"):
+                        img = img.convert("RGB")
+                    w, h = img.size
+                    if w != target_width:
+                        ratio = target_width / float(w)
+                        img = img.resize((target_width, int(h * ratio)))
+                    ih = img.size[1]
+                except Exception:
+                    continue
+                if current_images and current_height + ih > max_total_height:
+                    merged = Image.new("RGB", (target_width, current_height))
+                    y = 0
+                    for im in current_images:
+                        merged.paste(im, (0, y))
+                        y += im.size[1]
+                    out = io.BytesIO()
+                    merged.save(out, format="JPEG", quality=85)
+                    outputs.append(out.getvalue())
+                    current_images = [img]
+                    current_height = img.size[1]
+                else:
+                    current_images.append(img)
+                    current_height += ih
+            if current_images:
+                merged = Image.new("RGB", (target_width, current_height))
+                y = 0
+                for im in current_images:
+                    merged.paste(im, (0, y))
+                    y += im.size[1]
+                out = io.BytesIO()
+                merged.save(out, format="JPEG", quality=85)
+                outputs.append(out.getvalue())
+            return outputs if outputs else None
+        except Exception:
+            return None