Serial.println(stringOne.length()); // trim the white space off the string: stringOne.trim(); Serial.print(stringOne); Serial.print("<--- end of trimmed string. Length: "); Serial.println(stringOne.length()); // do nothing while true: while (true); } [Get Code] 更多 String obj...
StringIndexOf - 寻找在字符串里字符的第一个或最后一个的状态 StringLength - 获得和修剪字符串的长度 StringLengthTrim - 获得和修剪字符串的长度 StringReplace - 替换字符串里的个别字符 StringStartsWithEndsWith - 检查一个给定的字符或子串(substrings)的开始或结尾 StringSubstring - 在给定的字符串里寻找"p...
#include <Arduino.h> #include <Regexp.h> // called for each match void match_callback(const char *match, // matching string (not null-terminated) const unsigned int length, // length of matching string const MatchState &ms) // MatchState in use (to get captures) { char cap[10]; ...
使用length() 可以获得字符串的长度,使用 trim() 可以消除多余的空白格,代码示例如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /* * 获取字符串的长度 */ void setup() { Serial.begin(9600); } void loop() { String stringOne = String(" Hello World! "); Serial.println(stringOne);...
//plus a user-supplied token to identify the causing requestvoidhandleData(ModbusMessage response, uint32_t token) {//回调函数Serial.printf("Response: serverID=%d, FC=%d, Token=%08X, length=%d:\n", response.getServerID(), response.getFunctionCode(), token, response.size());for(auto &...
if(recordTemp.length()>27) //为了优化记录速度,recordTemp每截获20个字符才写入record.txt文件一次(包含了开头的[Begin],所以是27),这个值可以任意设置{if (RecordFile){recordTemp.concat("[End]");RecordFile.println(recordTemp);RecordFile.close();Serial.println("Writing to file done."); //到达20...
for(int m=0;m<mycommand.length();m++) // { char ch = mycommand[m]; //读取串口数据 switch(ch) { case '0'...'9': v = v*10 + ch - '0'; //字符转换成十进制 break; case 'a': //如果数据后带a,则表示是一号舵机的数据,比如串口发送85a ...
// (1) print the string Serial.println(str); // (2) get the length of the string (excludes null terminator) num = strlen(str); Serial.print("String length is: "); Serial.println(num); // (3) get the length of the array (includes null terminator) num = sizeof(str); // size...
String result = line.substring(1); // Parse JSON int size = result.length() + 1; char json[size]; result.toCharArray(json, size); StaticJsonBuffer<200> jsonBuffer; JsonObject& json_parsed = jsonBuffer.parseObject(json); if (!json_parsed.success()) ...
String endpoint = "/uploadData";String postData = "data=" + data;if (client.connect(server, 80)) { client.println("POST " + endpoint + " HTTP/1.1");client.println("Host: " + server);client.println("Content-Type: application/x-www-form-urlencoded");client.println("Content-Length: ...