Update app.py

app.py

@@ -72,8 +72,30 @@ def convert_pdf(pdf_file, pages="all", dpi=DEFAULT_DPI):
     if pdf_file is None:
         raise gr.Error("请上传 PDF 文件")
 
-    # 读取 PDF bytes 并渲染为图像
-    pdf_bytes = pdf_file.read()
+    # 读取 PDF bytes 并兼容 gradio 不同版本的返回值（file-like / dict / 有 name 属性 / 路径）
+    pdf_bytes = None
+    if hasattr(pdf_file, "read"):  # file-like object
+        pdf_bytes = pdf_file.read()
+    elif isinstance(pdf_file, dict) and "name" in pdf_file:  # gradio 有时返回 dict {'name': path}
+        with open(pdf_file["name"], "rb") as f:
+            pdf_bytes = f.read()
+    elif hasattr(pdf_file, "name") and isinstance(pdf_file.name, str):  # object with .name path
+        with open(pdf_file.name, "rb") as f:
+            pdf_bytes = f.read()
+    else:
+        # 兜底：尝试把对象当作路径处理
+        try:
+            p = str(pdf_file)
+            if os.path.exists(p):
+                with open(p, "rb") as f:
+                    pdf_bytes = f.read()
+        except Exception:
+            pdf_bytes = None
+
+    if pdf_bytes is None:
+        raise gr.Error("无法读取上传的 PDF 文件（不支持的文件对象类型）")
+
+    # 渲染 PDF 为图像
     images_all = rasterize_pages(pdf_bytes, dpi=int(dpi))
 
     # 页码选择与限制