error C2039: 'wstring' : is not a member of 'std'(转)

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转载 最新推荐文章于 2023-07-13 11:43:53 发布 · 1.1w 阅读 · 0
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#error C2039 #wstring

本文详细介绍了在使用C++编写Windows应用程序时遇到的错误C2039 'wstring' is not a member of 'std' 的解决方法。通过引入必要的头文件 <string>，可以有效避免该错误，确保程序正确运行。
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网上其他的回答还包括检查 c++ 的版本信息，看看是否支持 wstring_convert，因为这个函数好像在 c++11 中被引入，在 c++17 中被摒弃了。做编码格式转换时，报错。
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C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(35) : warning C4183: 'displayInfo': member function definition looks like a ctor, but name does not match enclosing class C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(46) : warning C4183: 'displayInfo': member function definition looks like a ctor, but name does not match enclosing class C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(52) : error C2018: unknown character '0xa3' C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(52) : error C2018: unknown character '0xac' C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(52) : error C2143: syntax error : missing ')' before 'constant' C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(52) : error C2664: '__thiscall Bicycle::Bicycle(const class Bicycle &)' : cannot convert parameter 1 from 'char [7]' to 'const class Bicycle &' Reason: cannot convert from 'char [7]' to 'const class Bicycle' No constructor could take the source type, or constructor overload resolution was ambiguous C:\Users\张宇辰\Desktop\学习\www\2-7.cpp(52) : error C2059: syntax error : ')' 执行 cl.exe 时出错. 2-7.obj - 1 error(s), 0 warning(s)
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In file included from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/BlinkerESPMQTT.h:16, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker.h:43, from E:\sketch_aug20a\sketch_aug20a.ino:6: c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Adapters/BlinkerMQTT.h: In member function 'virtual char* BlinkerMQTT::token()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Adapters/BlinkerMQTT.h:144:50: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 144 | char * token() { if (!isMQTTinit) return ""; else return MQTT_KEY_MQTT; } | ^~ In file included from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/BlinkerESPMQTT.h:16, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker.h:43, from E:\sketch_aug20a\sketch_aug20a.ino:6: c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Adapters/BlinkerMQTT.h: In member function 'virtual char* BlinkerMQTT::lastRead()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Adapters/BlinkerMQTT.h:963:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 963 | else return ""; | ^~ In file included from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:95, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/BlinkerESPMQTT.h:17, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker.h:43, from E:\sketch_aug20a\sketch_aug20a.ino:6: c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApiBase.h: In member function 'char* BlinkerBridge_key::getName()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApiBase.h:196:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 196 | else return "false"; | ^~~~~~~ In file included from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:96, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/BlinkerESPMQTT.h:17, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker.h:43, from E:\sketch_aug20a\sketch_aug20a.ino:6: c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h: In member function 'char* BlinkerProtocol::deviceName()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h:104:86: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 104 | char * deviceName() { if (isInit) return conn->deviceName(); else return ""; } | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h: In member function 'char* BlinkerProtocol::authKey()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h:105:83: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 105 | char * authKey() { if (isInit) return conn->authKey(); else return ""; } | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h: In member function 'char* BlinkerProtocol::token()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h:106:79: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 106 | char * token() { if (isInit) return conn->token(); else return ""; } | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h: In member function 'char* BlinkerProtocol::dataParse()': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerProtocol.h:257:86: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 257 | char* dataParse() { if (canParse) return conn->lastRead(); else return ""; } | ^~ In file included from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Adapters/BlinkerMQTT.h:46, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/BlinkerESPMQTT.h:16, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker.h:43, from E:\sketch_aug20a\sketch_aug20a.ino:6: c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: At global scope: c:\users\administrator\documents\arduino\libraries\blinker\src\blinker\blinkerconfig.h:226:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 226 | #define BLINKER_CMD_BUILTIN_SWITCH "switch" | ^~~~~~~~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:913:71: note: in expansion of macro 'BLINKER_CMD_BUILTIN_SWITCH' 913 | BlinkerWidgets_string _BUILTIN_SWITCH = BlinkerWidgets_string(BLINKER_CMD_BUILTIN_SWITCH); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/BlinkerESPMQTT.h:17, from c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker.h:43, from E:\sketch_aug20a\sketch_aug20a.ino:6: c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::bridgeKey(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:7831:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 7831 | else return ""; | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::bridgeName(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:7838:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 7838 | else return "false"; | ^~~~~~~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::widgetName_str(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:8467:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 8467 | else return ""; | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::widgetName_joy(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:8474:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 8474 | else return ""; | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::widgetName_rgb(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:8481:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 8481 | else return ""; | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::widgetName_int(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:8487:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 8487 | else return ""; | ^~ c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h: In member function 'char* BlinkerApi::widgetName_tab(uint8_t)': c:\Users\Administrator\Documents\Arduino\libraries\Blinker\src/Blinker/BlinkerApi.h:8493:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] 8493 | else return ""; | ^~ E:\sketch_aug20a\sketch_aug20a.ino: In function 'void setup()': E:\sketch_aug20a\sketch_aug20a.ino:395:21: error: cannot bind non-const lvalue reference of type 'String&' to an rvalue of type 'String' 395 | loadCredentials("", "", deviceKey); // 获取设备密钥 | ^~ In file included from C:\Users\Administrator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:295, from C:\Users\Administrator\AppData\Local\arduino\sketches\BB54217B4F7707A62BB8B5A03FB8EB42\sketch\sketch_aug20a.ino.cpp:1: C:\Users\Administrator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/WString.h:57:9: note: after user-defined conversion: 'String::String(const char*)' 57 | String(const char *cstr); | ^~~~~~ E:\sketch_aug20a\sketch_aug20a.ino:106:30: note: initializing argument 1 of 'bool loadCredentials(String&, String&, String&)' 106 | bool loadCredentials(String &ssid, String &pass, String &deviceKey) { | ~~~~~~~~^~~~ E:\sketch_aug20a\sketch_aug20a.ino:397:13: error: 'class BlinkerESPMQTT' has no member named 'attachVoice'; did you mean 'attachBridge'? 397 | Blinker.attachVoice(voiceCommand); | ^~~~~~~~~~~ | attachBridge Multiple libraries were found for "Blinker.h" Used: C:\Users\Administrator\Documents\Arduino\libraries\Blinker Not used: C:\Users\Administrator\Documents\Arduino\libraries\BarePoller Not used: C:\Users\Administrator\Documents\Arduino\libraries\GyverBlinker Multiple libraries were found for "ArduinoOTA.h" Used: C:\Users\Administrator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\ArduinoOTA Not used: C:\Users\Administrator\Documents\Arduino\libraries\ArduinoOTA Multiple libraries were found for "EEPROM.h" Used: C:\Users\Administrator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\EEPROM Not used: C:\Users\Administrator\Documents\Arduino\libraries\ATMAC_EEPROM Multiple libraries were found for "Ticker.h" Used: C:\Users\Administrator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\Ticker Not used: C:\Users\Administrator\Documents\Arduino\libraries\SimpleTicker Not used: C:\Users\Administrator\Documents\Arduino\libraries\Ticker exit status 1 Compilation error: cannot bind non-const lvalue reference of type 'String&' to an rvalue of type 'String'
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