下面是《完美图解物联网IOT实操》里面的示例代码
#include "SPI.h"
#include "Ethernet.h"
#include "WebServer.h"
#include "Streaming.h" // 引用处理字符串的库（参阅下文说明）
#include "dht11.h"
dht11 DHT11; // 声明 DHT11 程序对象
const byte dataPin = 2; // 声明 DHT11 模块的数据输入脚位
static byte mac[] = { 0xF0, 0x7B, 0xCB, 0x4B, 0x7C, 0x9F };
IPAddress ip(192, 168, 1, 25);
IPAddress subnet(255, 255, 255, 0);
IPAddress gateway(192, 168, 1, 1);
WebServer webserver("", 80);
P(htmlHead) =
"<!doctype html><html>"
"<head><meta charset=\"utf-8\">"
" <meta http-equiv=\"refresh\" content=\"3\">"
"<title>Arduino 温湿度计</title>"
"</head><body>";
P(htmlFoot) = "</body></html>";
void defaultCmd(WebServer &server, WebServer::ConnectionType type, char *, bool)
{
int chk = DHT11.read(dataPin);
char buffer[5] = "";
server.httpSuccess();
if (type != WebServer::HEAD){
server.printP(htmlHead);
if (chk == 0) {
server << "<h1>温湿度计</h1>";
server << "<p>温度：" << dtostrf(DHT11.temperature, 5, 2, buffer)
<< "°C</p>";
server << "<p>湿度：" << dtostrf(DHT11.humidity, 5, 2, buffer)
<< "%</p>";
} else {
server << "<h1>无法读取温湿度值</h1>";
}
server.printP(htmlFoot);
}
}
void dht11Cmd(WebServer &server, WebServer::ConnectionType type, char *, bool)
{
int chk = DHT11.read(dataPin);
char buffer[5] = "";
server.httpSuccess("text/plain"); // 设置返回「纯文本」内容类型
if (type != WebServer::HEAD) {
if (chk == 0) {
server << dtostrf(DHT11.temperature, 5, 2, buffer);
} else {
server << "??";
}
}
}
void thCmd(WebServer &server, WebServer::ConnectionType type, char *, bool)
{
int chk = DHT11.read(dataPin);
char buffer[5] = "";
server.httpSuccess("text/javascript");
if (type != WebServer::HEAD) {
if (chk == 0) {
server << "{\"t\":" << dtostrf(DHT11.temperature, 5, 2, buffer)
<< ",\"h\":" << dtostrf(DHT11.humidity, 5, 2, buffer)
<< "}";
} else {
server << "{\"t\":\"?\",\"h\":\"?\"}";
}
}
}
void setup() {
Ethernet.begin(mac, ip, gateway, subnet);
webserver.setDefaultCommand(&defaultCmd); // 处理「首页」请求
webserver.addCommand("temp", &dht11Cmd);
webserver.addCommand("th.json", &thCmd);
webserver.begin();
}
void loop() {
webserver.processConnection();
}
每次用Arduino编译都出现大量错误提示，如下错误信息：图片说明](https://img-ask.csdn.net/upload/201712/21/1513850867_255461.png)
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