英文改中文，增加了文件选择的错误异常抛出

sender/sender.py

@@ -25,6 +25,8 @@ def main():
 
     with open(path,"rb") as f:
         data = f.read()
+
+
     letter.fileName = getFileName(path)
     letter.recvPubKey = getRecvPubKey()
     letter.senderPubKey = getSenderPubKey()
@@ -36,8 +38,7 @@ def main():
     letter.sign = getSign(data)
 
     print(letter.fileName)
-
-
+    print(letter.fileBase64)
     print(letter.sign)
     print(letter.encryptType)
     print(letter.encryptKey)
@@ -51,9 +52,19 @@ def main():
     return letter # 方便recv测试，以后可以删除。
     pass
 def selectFile() -> str:
-    s = input("输入文件路径:")
     # s = "public.pem"
+    while True:
+        try:
+            s = input("输入文件路径:")
+            with open(s, "rb") as _:
+                pass
             return  s
+        except FileNotFoundError:
+            print("错误: 文件未找到，请输入正确的文件路径。")
+        except PermissionError:
+            print("错误: 无法访问该文件，请检查权限。")
+        except Exception as e:
+            print(f"发生未知错误: {e}")
 
 # 获得文件名
 def getFileName(fName:str) -> str:
@@ -73,34 +84,35 @@ def selectSymEncryptionChoice():
 
     # 选择加密算法
     while True:
-        encryWay = input("Choose the way for encryption (aes/sm4): ").strip().lower()  # 统一转成小写
+        encryWay = input("选择加密算法 (aes/sm4): ").strip().lower()  # 统一转成小写
         if encryWay in ["aes", "sm4"]:
             letterWay = encryWay
-            print(f"You have selected '{encryWay}' encryption.")
+            print(f"已经选择 '{encryWay}'.")
             break  # 输入有效后退出循环
         else:
-            print("Invalid choice. Please enter 'aes' or 'sm4'.")
+            print("非法选择，请输入 'aes' 或 'sm4'.")
 
     # 选择加密算法的模式
     while True:
         if encryWay == "aes":
-            encryMode = input("Choose the encryption mode (ecb/cbc/cfb/ofb): ").strip().lower()
+            encryMode = input("选择加密算法模式 (ecb/cbc/cfb/ofb): ").strip().lower()
             if encryMode in ["ecb", "cbc", "cfb", "ofb"]:
                 letterMode = encryMode
-                print(f"You have selected '{encryMode}' encryption mode.")
+                print(f"已选择 '{encryMode}' 加密模式.")
                 break  # 输入有效后退出循环
             else:
-                print("Invalid choice. Please enter ecb/cbc/cfb/ofb")
+                print("非法输入，请输入 ecb/cbc/cfb/ofb")
 
         elif encryWay == "sm4":
-            encryMode = input("Choose the encryption mode (ecb/cbc): ").strip().lower()
+            encryMode = input("选择加密模式 (ecb/cbc): ").strip().lower()
             if encryMode in ["ecb", "cbc"]:
                 letterMode = encryMode
-                print(f"You have selected '{encryMode}' encryption mode.")
+                print(f"已选择 '{encryMode}' 加密模式.")
                 break  # 输入有效后退出循环
             else:
-                print("Invalid choice. Please enter ecb/cbc")
+                print("非法输入，请输入 enter ecb/cbc")
 
+    # 返回加密方法和加密方法的模式
     return encryWay, encryMode
 
 
@@ -137,6 +149,7 @@ def getSign(document_bytes):
 
     return signDocuHash
 
+# 获得加密的方法和模式，封装信封
 def getEncryptType():
     encryType = f"{letterWay}_{letterMode}".upper()