fix:添加UI界面，完善功能

utils/pdf_utils.py

@@ -0,0 +1,42 @@
+import os
+
+import comtypes.client
+
+
+def ppt_to_pdf_single(ppt_path, pdf_path=None):
+    """
+    单个 PPT 转 PDF
+    :param ppt_path: PPT 文件路径
+    :param pdf_path: PDF 输出路径 (可选，默认同名)
+    """
+    ppt_path = os.path.abspath(ppt_path)  # COM 接口必须使用绝对路径
+
+    if pdf_path is None:
+        pdf_path = os.path.splitext(ppt_path)[0] + ".pdf"
+    pdf_path = os.path.abspath(pdf_path)
+
+    if not os.path.exists(ppt_path):
+        print(f"文件不存在: {ppt_path}")
+        return False
+
+    powerpoint = None
+    try:
+        # 启动 PowerPoint 应用
+        powerpoint = comtypes.client.CreateObject("PowerPoint.Application")
+        powerpoint.Visible = 1  # 设为可见，否则某些版本会报错
+
+        # 打开演示文稿
+        deck = powerpoint.Presentations.Open(ppt_path)
+
+        # 保存为 PDF (文件格式代码 32 代表 PDF)
+        deck.SaveAs(pdf_path, 32)
+
+        deck.Close()
+        print(f"转换成功: {pdf_path}")
+        return True
+    except Exception as e:
+        print(f"转换失败: {str(e)}")
+        return False
+    finally:
+        if powerpoint:
+            powerpoint.Quit()