c - Spark 核心 wifi 凭据更改

Question

我正在使用我的 spark 核心研究一个小产品创意，并为客户设置一个串行接口(interface)，以便将他们的产品设置到他们的 wifi 上:

String newssid = wifissid(3);
String newpw = wifipw(3);
WiFi.setCredentials(newssid, newpw);

如您所见，我创建了 2 个函数，它们通过与 pc 的串行连接返回 ssid 和密码。当我在代码中设置凭据时，我已经设法让 setCredentials 工作:

WiFi.setCredentials("D-link7853", "thisismypassword");

但是当我用字符串运行它时，如上所述，它不想编译。给出的错误是:

serial_wifi_cred_change_3.cpp:49:39: error: no matching function for call to 'WiFiClass::setCredentials(String&, String&)' }
serial_wifi_cred_change_3.cpp:49:39: note: candidates are: In file included from ../inc/spark_wiring.h:37:0, from ../inc/application.h:29, from serial_wifi_cred_change_3.cpp:2: ../inc/spark_wiring_wifi.h:61:21: note: static void WiFiClass::setCredentials(const char*) static void setCredentials(const char ssid); ^ ../inc/spark_wiring_wifi.h:61:21: note: candidate expects 1 argument, 2 provided ../inc/spark_wiring_wifi.h:62:21: note: static void WiFiClass::setCredentials(const char, const char*) static void setCredentials(const char *ssid, const char password); ^ ../inc/spark_wiring_wifi.h:62:21: note: no known conversion for argument 1 from 'String' to 'const char' ../inc/spark_wiring_wifi.h:63:21: note: static void WiFiClass::setCredentials(const char*, const char*, long unsigned int) static void setCredentials(const char *ssid, const char *password, unsigned long security); ^

Answer 1

错误表明它不需要字符串，而是指向 const char 数组的指针。该网站上的文档似乎具有误导性。