Getting error: incompatible types in assignment of 'const char*' to 'char [100]'

Question

我正在尝试将一个字符保存到 EEPROM，然后再检索它。 我正在使用带有此代码和 arduino IDE:

的 ESP32-CAM

#include <EEPROM.h>

int addr = 0; 
char ssidString[100] = {0};
float floatFromPC2 = 0;
char pskString[100] = {0};
    
void setup() {
  if (!ssidString == "") {
    EEPROM.begin(512);          //Initialize EEPROM
    EEPROM.write(addr, 'A');    //Write character A
    addr++;                     //Increment address
    EEPROM.write(addr, 'B');    //Write character A
    addr++;                     //Increment address
    EEPROM.write(addr, 'C');    //Write character A
     
    String uuu = pskString;
    String www = ssidString + uuu;
    Serial.print(www);

    for (int i=0; i<www.length(); i++) { //loop upto string lenght www.length() returns length of string
      EEPROM.write(0x0F+i,www[i]);       //Write one by one with starting address of 0x0F
    }
    EEPROM.commit(); 
  } else if (ssidString == "") {
    EEPROM.begin(512);
    Serial.println("WHAT"); //Goto next line, as ESP sends some garbage when you reset it  
    Serial.print(char(EEPROM.read(addr)));    //Read from address 0x00
    addr++;                      //Increment address
    Serial.print(char(EEPROM.read(addr)));    //Read from address 0x01
    addr++;                      //Increment address
    Serial.println(char(EEPROM.read(addr)));    //Read from address 0x02
    addr++;                      //Increment address
    Serial.println(char(EEPROM.read(addr)));    //Read from address 0x03
    
    //Read string from eeprom
    String www;   
    //Here we dont know how many bytes to read it is better practice to use some terminating character
    //Lets do it manually www.circuits4you.com  total length is 20 characters
    for (int i=0; i<16; i++) {
      www = www + char(EEPROM.read(0x0F + i)); //Read one by one with starting address of 0x0F    
    } 
      
    String uuu;
    for (int i=31; i<32; i++) {
      uuu = char(EEPROM.read(0x0 + i));
    } 
    Serial.println("this");
    Serial.print(www);  //Print the text on serial monitor
    Serial.println("that");
    Serial.print(uuu);
    ssidString = www.c_str();
    pskString = uuu.c_str();
  }
}

执行此操作时出现错误：

incompatible types in assignment of 'const char*' to 'char [100]'

我正在通过串口将 ssidString 和 pskString 从 ESP12e 发送到 ESP32-CAM，并通过将字节数设置为 100 使其工作，因为它不知道所说和传递的长度。

我正在尝试从 EEPROM 中获取数据并将其放入 WiFi.begin(ssidString, pskString);

有人可以帮忙吗？

Answer 1

尝试：

String uuu = String(pskString);
String www = String(ssidString) + uuu;

此外，您不应该使用 == 比较 c 字符串；尝试：

if (strcmp(ssidString, "") != 0)

和

else if(strcmp(ssidString, "") == 0)

并查看这些更改后出现的错误（如果有）。