现在arduinojson更新到了v6，v5的代码似乎不能继续用了

[ningbolaoyao]

举个例子，如何在v6代码中如何提取json中的city字符串，然后直接让墨水屏显示呢，
墨水屏显示代码如下
void displaytext(){
display.init(115200);
display.setRotation(0);
u8g2Fonts.begin(display);
display.firstPage();
uint8_t SCREEN_WIDTH=400;
do
{
u8g2Fonts.setBackgroundColor(0xff);
u8g2Fonts.setForegroundColor(0x00);
u8g2Fonts.setFont(u8g2_mfyuanhei_16_gb2312);
u8g2Fonts.drawUTF8(250, 150, “测试”);
}

while (display.nextPage());
display.hibernate();
}
以下是我的获取json的代码
HTTPClient http;
WiFiClient wifiClient;
if (WiFi.status() == WL_CONNECTED){
http.begin(wifiClient,"http://whois.pconline.com.cn/ipJson.jsp?ip=xxx.xxx.xxx.xxx&json=true");
int httpCode = http.GET();
Serial.print(httpCode);
http.setUserAgent("Mozilla/5.0 (Windows NT 11.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.82 Safari/537.36");
if (httpCode==HTTP_CODE_OK)
{
String respone = http.getString();
StaticJsonDocument<384> doc;
DeserializationError error = deserializeJson(doc, respone);
if (error)
{
Serial.print(F("deserializeJson() failed: "));
Serial.println(error.f_str());
return ;
}
const char* ip = doc["ip"]; // "202.101.102.194"
const char* pro = doc["pro"]; // "福建省"
const char* proCode = doc["proCode"]; // "350000"
const char* city = doc["city"]; // "福州市"
const char* cityCode = doc["cityCode"]; // "350100"
const char* region = doc["region"]; // nullptr
const char* regionCode = doc["regionCode"]; // "0"
const char* addr = doc["addr"]; // "福建省福州市 电信"
const char* regionNames = doc["regionNames"]; // nullptr
const char* err = doc["err"]; // nullptr
http.end();
}