我试图让我的ESP8266将AP名称设置为Stand
+ MAC地址减去分号,如Stand5CCF7F238734
。
我写的GetMyMacAddress()
函数显然是工作的,串行输出显示。
每次我尝试将字符串或字符变量传递给wifiManager.autoConnect()
时,我会得到编译器错误。即使头文件标识字符串类型。
如果我通过macStr
或*macStr
从'char'转换为'const char*'无效[-fpermissive]
如果我传递ap2
(字符串类型),我得到:
我代码:没有匹配的函数来调用'WiFiManager::autoConnect(String&)'
#include <ESP8266WiFi.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>
String ap = "Stand";
String ap2;
uint8_t mac[6];
char const macStr[19] = {0};
void setup() {
Serial.begin(115200);
WiFiManager wifiManager; //WiFiManager -- Local intialization.
ap2 = ap + GetMyMacAddress();
//std::string ap2;
char *macStr = new char[ap2.length()+ 1 ];
strcpy(macStr, ap2.c_str());
//fetches ssid and pass from eeprom and tries to connect
//if connect fails it starts an access point with the specified name
//here "AutoConnectAP" and goes into a loop awaiting configuration
wifiManager.autoConnect( "Stand" );
//or use this for auto generated name ESP + ChipID
//wifiManager.autoConnect();
//if you get here you have connected to the WiFi
Serial.println("connected...yeey :)");
Serial.print("ap2"); Serial.print(" " ); Serial.print( ap2); Serial.println(" String");
Serial.print("macStr"); Serial.print(" "); Serial.print( macStr ); Serial.println(" Char");
}
void loop() {
}
String GetMyMacAddress()
{
uint8_t mac[6];
char macStr[18] = {0};
WiFi.macAddress(mac);
sprintf(macStr, "%02X%02X%02X%02X%02X%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); // no :'s
// sprintf(macStr, "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); // with :'s
return String(macStr);
}
连接后,串行输出:
connected...yeey :)
ap2 Stand5CCF7F238734 String
macStr Stand5CCF7F238734 Char
如果你想使用ap2字符串对象,你需要使用它的char数组和const强制转换,如:
wifiManager.autoConnect((const char*)ap2.c_str());
我不明白为什么你使用动态分配的macStr, ap2的字符数组将足以处理它。尽管如此,如果你想使用它,可以这样尝试:
wifiManager.autoConnect((const char*)macStr);
祝你好运!