std::string_view 的使用

module/crc_check.cpp

@@ -4,13 +4,14 @@
 #include <filesystem>
 #include <iostream>
 #include <string>
+#include <string_view>
 using namespace Psc;
 int max_distance = 700;
 namespace fs = std::filesystem;
 class MY_File_Data_Source : public File_Data_Source {
 public:
   BaseLogger *logger{};
-  void pre_handle(const std::string &data) override {}
+  void pre_handle(std::string_view data) override {}
   void handle_mode_s(std::string &packet) override {}
   size_t line_num = 0;
   size_t line_num_ex = 0;
@@ -42,7 +43,7 @@ public:
           std::cout << "first:" << mem2hex(packet) << std::endl;
           return;
         }
-        std::string error_len =
+        std::string_view error_len =
             key + "  " + LOG_POS_SIMPLE + " mode_s_error_length";
         auto type = packet[1];
         if (type == Msg::AC) {
@@ -137,7 +138,7 @@ void handle(const fs::path &file_path, const fs::path &rel_path) {
 
   Mode_S::parse_call_back = [&](Mode_S::Parse_Call_Back_Type type,
                                 Aircraft_Info *aircraft_info,
-                                const std::string &field_name_or_error_info,
+                                std::string_view field_name_or_error_info,
                                 std::vector<std::string> bds_list,
                                 void *cur_parser, Mode_S::P_S mode_s_msg) {
     if (type == Mode_S::Parse_Call_Back_Type::Normal_Block)
@@ -200,7 +201,7 @@ void list_directory(const fs::path &dir_path, const fs::path &base_path) {
     }
   }
 }
-std::wstring _transformString2Wstring(const std::string &s) {
+std::wstring _transformString2Wstring(std::string_view s) {
   setlocale(LC_CTYPE, "en_US.UTF-8");
   const char *_Source = s.c_str();
   size_t len = strlen(_Source) + 1;
@@ -211,7 +212,7 @@ std::wstring _transformString2Wstring(const std::string &s) {
   delete[] wStr;
   return result;
 }
-std::wstring gbk_to_wstring(const std::string &gbk) {
+std::wstring gbk_to_wstring(std::string_view gbk) {
   int len = MultiByteToWideChar(CP_ACP, 0, gbk.c_str(), -1, nullptr, 0);
   std::wstring wstr(len, L'\0');
   MultiByteToWideChar(CP_ACP, 0, gbk.c_str(), -1, &wstr[0], len);