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我正在尝试删除部分字符串（前 10 个字符），以便获得字符串的序列代码，而无需任何额外的字符。现在，串行代码将始终在 ":" 冒号字符之后开始。那么有没有办法指定从“：”和之前删除字符串，以便只有剩余的字符串是序列键？
例如; 字符串是“Myserials:12e42-23w6z-23w-a23”
最终字符串必须是“12e42-23w6z-23w-a23”
我正在手动删除字符串；
public String myStr; public voID Start () { myStr = myStr.SubString (10,myStr.Length - 10); DeBUG.Log (myStr); }@H_489_13@解决方法
我会像这样使用字符串拆分函数：
#include "I2Cdev.h" #include "MPU6050_6Axis_MotionApps20.h" #include "Wire.h" #include "math.h" #include <SPI.h> #include <SD.h> File myFile; MPU6050 mpu; #define DEBUG #ifdef DEBUG //#define DPRINT(args...) serial.print(args) //OR use the following syntax: #define DPRINTSTIMER(t) for (static unsigned long SpamTimer; (unsigned long)(millis() - SpamTimer) >= (t); SpamTimer = millis()) #define DPRINTSFN(StrSize,Name,...) \ { \ charS[StrSize]; \ serial.print("\t"); \ serial.print(Name); \ serial.print(" "); \ serial.print(dtostrf((float)__VA_ARGS__,S)); \ } //StringSize,Variable,Spaces,Percision #define DPRINTLN(...) serial.println(__VA_ARGS__) #else #define DPRINTSTIMER(t) if (false) #define DPRINTSFN(...) //blank line #define DPRINTLN(...) //blank line #define PI 3.1415926535897932384626433832795 #endif #define LED_PIN 13 // // supply your own gyro offsets here,scaled for min sensitivity use MPU6050_calibration.ino // -4232 -706 1729 173 -94 37 // XA YA ZA XG YG ZG //int MPUOffsets[6] = { -4232,-706,1729,173,-94,37}; int MPUOffsets[6] = {436,-1485,914,47,-24,-28}; //{413,-1423,907,51,-38,-35} int led = 13; // LED on arduino int digitalPin = 7; // linear Hall magnetic sensor digital interface int analogPin = A0; // linear Hall magnetic sensor analog interface int digitalVal; // digital readings int analogVal; // analog readings int count = 0; float @R_823_6674@; int a = 0,def = 0,def2 = 0; float b = 0,dist = 0,pres_dist = 0,prec_dist = 0,x = 0,m = 0; float angle = 0; // ================================================================ // === i2c SETUP Items === // ================================================================ void i2cSetup() { // join I2C bus (I2Cdev library doesn't do this automatically) #if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE Wire.begin(); TWBR = 24; // 400kHz I2C clock (200kHz if CPU is 8MHz) #elif I2CDEV_IMPLEMENTATION == I2CDEv_bUILTin_FASTWIRE Fastwire::setup(400,truE); #endif } // ================================================================ // === INTERRUPT DETECTION RoutINE === // ================================================================ volatile bool mpuInterrupt = false; // inDicates whether MPU interrupt pin has gone high void dmPDAtaReady() { mpuInterrupt = true; } // ================================================================ // === MPU DMP SETUP === // ================================================================ int FifoAlive = 0; // tests if thE interrupt is triggering int IsAlive = -20; // counts interrupt start at -20 to get 20+ good values before assuming connected // MPU control/status vars uint8_t mpuIntStatus; // holds actual interrupt status byte from MPU uint8_t devStatus; // return status after each device operation (0 = success,!0 = error) uint16_t packetSize; // expected DMP packet size (default is 42 bytes) uint16_t fifoCount; // count of all bytes currently in FIFO uint8_t fifoBuffer[64]; // FIFO storage buffer // orientation/motion vars Quaternion q; // [w,x,y,z] quaternion container VectorInt16 aa; // [x,z] accel sensor measurements VectorInt16 aaReal; // [x,z] gravity-free accel sensor measurements VectorInt16 aaWorld; // [x,z] world-frame accel sensor measurements VectorFloat gravity; // [x,z] gravity vector float euler[3]; // [psi,theta,phi] Euler angle container float ypr[3]; // [yaw,pitch,roll] yaw/pitch/roll container and gravity vector byte StartUP = 100; // lets get 100 readings from the MPU before we start trusTing them (Bot is not trying to balance at this point it is just starTing up.) void MPU6050Connect() { static int MPUInitCntr = 0; // initialize device mpu.initialize(); // same // load and configure the DMP devStatus = mpu.dmpInitialize(); // same if (devStatus != 0) { // ERROR! // 1 = initial memory load failed // 2 = DMP configuration updates failed // (if it's going to break,usually the code will be 1) char *StatStr[5]{"No Error","initial memory load failed","DMP configuration updates failed","3","4"}; MPUInitCntr++; serial.print(F("MPU connection Try #")); serial.println(MPUInitCntr); serial.print(F("DMP Initialization failed (code ")); serial.print(StatStr[devStatus]); serial.println(F(")")); if (MPUInitCntr >= 10) return; //only try 10 times delay(10); MPU6050Connect(); // Lets try again return; } mpu.setXAccelOffset(MPUOffsets[0]); mpu.setYAccelOffset(MPUOffsets[1]); mpu.setZAccelOffset(MPUOffsets[2]); mpu.setXGyroOffset(MPUOffsets[3]); mpu.setYGyroOffset(MPUOffsets[4]); mpu.setZGyroOffset(MPUOffsets[5]); serial.println(F("Enabling DMP...")); mpu.setDMPEnabled(true); // enable Arduino interrupt detection serial.println(F("Enabling interrupt detection (Arduino external interrupt pin 2 on the Uno)...")); serial.print("mpu.geTinterruptDrive= "); serial.println(mpu.geTinterruptDrive()); attachInterrupt(0,dmPDAtaReady,RISING); //pin 2 on the Uno mpuIntStatus = mpu.geTintStatus(); // Same // get expected DMP packet size for later comparison packetSize = mpu.dmpGetFIFOPacketSize(); delay(2000); // Let it Stabalize mpu.resetFIFO(); // Clear fifo buffer mpu.geTintStatus(); mpuInterrupt = false; // wait for next interrupt } // ================================================================ // === MPU DMP Get Data === // ================================================================ void GetDMP() { // Best version I have made so far // serial.println(F("FIFO interrupt at:")); // serial.println(micros()); static unsigned long LastGoodPacketTime; mpuInterrupt = false; FifoAlive = 1; fifoCount = mpu.getFIFOCount(); if ((!fifoCount) || (fifoCount % packetSizE)) { // we have failed Reset and wait till next time! digitalWrite(LED_PIN,LOW); // lets turn off the blinking light so we can see we are failing. mpu.resetFIFO(); // clear the buffer and start overmpu.resetFIFO(); } else { while (fifoCount >= packetSizE) { // Get the packets until we have the latest! mpu.getFIFOBytes(fifoBuffer,packetSizE); // lets do the magic and get the data fifoCount -= packetSize; } LastGoodPacketTime = millis(); MPUMath(); // <<<<<<<<<<<<<<<<<<<<<<<<<<<< On success MPUMath() <<<<<<<<<<<<<<<<<<< digitalWrite(LED_PIN,!digitalRead(LED_PIN)); // Blink the Light } } // ================================================================ // === MPU Math === // ================================================================ float Yaw,Pitch,Roll; void MPUMath() { mpu.dmpGetQuaternion(&q,fifoBuffer); mpu.dmpGetGravity(&gravity,&q); mpu.dmpGetYawPitchRoll(ypr,&q,&gravity); Yaw = -(ypr[0] * 180.0 / M_PI); Pitch = (ypr[1] * 180.0 / M_PI); Roll = (ypr[2] * 180.0 / M_PI); def2 = b - Yaw; if (def2 > 340 || def2 < -340) { Yaw = Yaw; } else if (def2 > 10 || def2 < -10) { Yaw = b; } // DPRINTSTIMER(150) { // serial.print(Yaw); // DPRINTSFN(15,"\tYaw:",Yaw,6,1); // DPRINTSFN(15,"\tPitch:","\tRoll:",Roll,1); // DPRINTLN(); // } } // ================================================================ // === Setup === // ================================================================ void setup() { pinMode(led,OUTPUT); pinMode(digitalPin,INPUT); serial.begin(115200); //115200,115200,57600 while (!serial) ; serial.print("Initializing SD card..."); if (!SD.begin(10)) { serial.println("initialization failed!"); while (1) ; } serial.println("initialization done."); serial.println("i2cSetup"); i2cSetup(); serial.println("MPU6050Connect"); MPU6050Connect(); serial.println("Setup complete"); pinMode(LED_PIN,OUTPUT); } // ================================================================ // === Loop === // ================================================================ void loop() { myFile = SD.open("t21.txt",FILE_WRITE); if (myFilE) { serial.print("WriTing to test.txt..."); // myFile.println("This is a test file :)"); for (int i = 0; i < 100; i++) { if (mpuInterrupt) { // wait for MPU interrupt or extra packet(s) available GetDMP(); } analogVal = analogRead(analogPin); def = analogVal - a; if (def < -20) { count++; } pres_dist = count; dist = pres_dist - prec_dist; prec_dist = pres_dist; dist = dist * 0.35; a = analogVal; b = Yaw; serial.println(i); angle = Yaw * PI / 180; x = x + dist * cos(anglE); m = m + dist * sin(anglE); @R_823_6674@ = millis(); myFile.print(X); myFile.print("\t"); myFile.print(m); myFile.print("\t"); myFile.println(@R_823_6674@ / 1000); delay(20); } myFile.close(); serial.println("done."); serial.println("End"); } else { serial.println("error opening test.txt"); } serial.print(X); serial.print("\t"); serial.print(m); serial.print("\t"); serial.print(@R_823_6674@ / 1000); serial.print("\t"); serial.println(Yaw); }@H_489_13@ ,您可以查找第一次出现的 ':' 并直接获得结果，而不是拆分字符串：
var input = "Myserials:12e42-23w6z-23w-a23"; var result = input.SubString(input.IndexOf(':') + 1);@H_489_13@大佬总结
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