Update app.py

app.py

@@ -5,13 +5,22 @@ import gradio as gr
 
 
 def files_to_b64(files):
-    """把上传的多张图片转成 base64 列表，以便前端快速切换。"""
-    b64_list = []
+    """支持 Gradio NamedString / FileData / 纯路径字符串"""
+    out = []
     for f in files:
-        suffix = pathlib.Path(f.name).suffix[1:]
-        data = base64.b64encode(f.read()).decode()
-        b64_list.append(f"data:image/{suffix};base64,{data}")
-    return b64_list
+        # ① Gradio 4.x 的 FileData / NamedString
+        if hasattr(f, "data"):                    # NamedString / FileData
+            raw = f.data                         # bytes
+            suffix = pathlib.Path(f.name).suffix[1:]
+        # ② 早期 gr.File 可能直接给文件路径字符串
+        else:
+            path = pathlib.Path(f)
+            raw = path.read_bytes()
+            suffix = path.suffix[1:]
+
+        b64 = base64.b64encode(raw).decode()
+        out.append(f"data:image/{suffix};base64,{b64}")
+    return out
 
 
 def render_img(b64_list, idx, scale):