Arduino String to char pointer

char *mqtt_command = {}; means mqtt_command is an array of 3 char * , i.e. three pointers to characters. Since strings are represented as pointers to characters, this can be called an array of three strings. There's no actual space for the characters themselves though, so this is not enough to work with but it's a good start String. toCharArray() Description. Copies the string's characters to the supplied buffer. Syntax. string.toCharArray(buf, len) Parameters. string: a variable of type String buf: the buffer to copy the characters into (char []) len: the size of the buffer (unsigned int) Returns. None Example See also. getBytes() Reference Hom

c - Arduino strings and chars and pointers and such

According to https://www.arduino.cc/en/Reference/StringToCharArray the method . Copies the string's characters to the supplied buffer. However, as I implied by asking why in reply #1, you do not need to use Strings in the first place Arduino String to Char*. #arduino. #string. #char*. char* string2char(String command) { if(command.length()!=0) { char *p = const_cast<char*> (command.c_str()); return p; } } #arduino. #string. #char* arrays - tochararray - arduino string to char pointer. Hat Arduino's.toCharArray () Methode einen Fehler? (1) toCharArray kopiert so viele Zeichen wie möglich in den Puffer und gibt dabei eine gültige C-Zeichenfolge zurück . Eine gültige C-Zeichenfolge hat ein Null-Byte (00) Basically String type variable in arduino is character array, Conversion of string to character array can be done using simple toCharArray () function. Getting string value in character array is useful when you want to break single string into parts or get part of string. Generally, strings are terminated with a null character (ASCII code 0)

Since it's an object that's allocated on the stack (or in global space) and not a pointer to the object you can get a pointer to it like with an int: String s1 = Foo; String *s2 = &s1; (*s2) += bar; Which gives you just one object and one memory space, but two names for it, and the result is: s1: Foobar\0 s2: Foobar\ c++ - pointer - string to const char arduino . wie kann ich const char*in Das heißt, Sie können eine std::string wie folgt aus einer char_const*: string (Blah) und Sie erhalten ein temporäres c_str char const* mit der Methode c_str. Beachten Sie, dass das Ergebnis von c_str nur gültig ist, solange die ursprüngliche string Instanz existiert und nicht geändert wird. Wenn Sie. You can have an array of pointers to char array strings, but unless they have a fixed maximum length, you need to allocate and de-allocate memory for them as you go, which is possible but not something for the person who lacks attention to detail. RayLivingston June 22, 2015, 4:22am #4 This is very useful for parameters that are a few bytes in size, i.e. strings and structures char* ptr. When you pass a pointer it is passed by value, you can modify the pointer or the data it points to. Since a pointer is usually only the word size of the processor it is only as expensive as passing an int parameter. When you pass a const char* cPtr you can not modify the value of the pointer, but you can modify the value of the data pointed to. This type of parameter will let. There are two ways to convert a String to a char pointer. The first is to call toCharArray() which copies all the characters to an array: // #3 char tmp [ 32 ] s . toCharArray ( tmp , sizeof ( tmp )); send ( tmp )

Just to recap, let's look at some simple code to demo the syntax of using a pointer: int myVar = 10; int *myPointer; myPointer = &myVar; *myPointer = 20; If you were to compile this code and run it, you would see that at the end myVar's value would now be 20 even though you'll notice we never set myVar itself to 20 Parameters. myString: a variable of type String. buf: the buffer to copy the characters into. Allowed data types: array of char. len: the size of the buffer. Allowed data types: unsigned int Because the string itself is an array, it is actually the typical of a two dimensional array. In the following code, of char*, a '*' at the end of char represents this is a pointer array. All array names are actually pointers, so so it needs an array of an array On the contrary, ptr is a pointer variable of type char, so it can take any other address. As a result string, assignments are valid for pointers. ptr = Yellow World; // ok After the above assignment, ptr points to the address of Yellow World which is stored somewhere in the memory

Arduino - StringToCharArra

So far I have only shown you one way of creating strings: char [num] { = content;}, but there are others, and they each have special meaning. char *string; That format just creates a pointer to a string. It doesn't actually point to any string at all - it's like a string with no size to it whatsoever. You may thing that's useless, but it's not - it's incredibly useful. You can use it to point to any other string, and since it's really just a number, you can. In order to convert a character array to a string, the String() constructor can be used. An example is shown below −. Example void setup() { // put your setup code here, to run once: Serial.begin(9600); Serial.println(); char buf[10] = Hello!; Serial.print(Char array: ); Serial.println(buf); String s = String(buf); Serial.print(String: ); Serial.println(s); } void loop() { // put your main code here, to run repeatedly: Strings are used to store text. They can be used to display text on an LCD or in the Arduino IDE Serial Monitor window. Strings are also useful for storing the user input. For example, the characters that a user types on a keypad connected to the Arduino. There are two types of strings in Arduino programming − INT TO OTHER DATA TYPE CONVERSION. This Arduino code will convert data types from int to other, see below. Convert int to float in Arduino. Convert int to char in Arduino. Convert int to char array in Arduino. Convert int to String in Arduino. Data type conversion: Int to float, char, char array [] and String. // https://pijaeducation

Arduino define array | an array is a collection of

Hi, I just want to know if there is a way of converting a string variable into a const unsigned char pointer. Alternatively, I expect a blabla() function as the following char *arr[ROW]; //array of pointer to string . You can see the below image in which I have created an array of pointer to a string whose size is 5. and each pointer is pointing to the address of the first character of the string. If you want to learn more about the c language, here 10 Free days C video course for you. Based on how you want to represent the array of strings, you can define a. The only thing that the 'C' language itself knows is the char array - the language itself neither knows nor cares whether the programmer might be using it to hold a string. But the standard 'C' Library does define a set of functions that work with NUL-terminated char arrays - calling them strings

As most Arduino users, you probably learned the C language before C++. Of course, you did! It's the way everybody learns C++ today. While learning C, you applied the good practice of using a NULL to designate an empty pointer.. What if I tell you that using NULL is considered as a code smell for experienced C++ developers? And, what if I tell you that most C++ coding standards now forbids. Thank you so much for your nice work. I am trying to use your lib to send data over internet. My problem is that i want to convert a JSON object msg to String or Char* before sending it to internet. However, i don't know how it does. Hop..

Example 2: String to Integer conversion Arduino String val = 1234 int atoi((const char * str); Here, str is of type pointer to a character. The const keyword is used to make variables non-modifiable. This function returns an integer value after execution. The atoi() function is present in the stdlib.h header file. This header file contains all the type casting functions used in the C. We will be using the Arduino language to collect string data from a Serial port. This will allow us to change specific values of the code whilst the data is running - for example, we can change the speed of a motor or the colour of an LED without having to adjust the code and/or restarting the program. This project will give you the code and explain what is happening in each line. The Code. How to use String() Function with Arduino. Learn String() example code, reference, definition. Constructs an instance of the String class. Return An instance of the String class. What is Arduino String()

String to char* [SOLVED] - Programming Questions - Arduino

  1. Those for the char data type, the increment of the pointer will increase the memory address by 1 byte, and for the long type, adding 1 to the pointer will add 4 bytes to the real memory address. Arithmetic operations are mainly used when working with data placed in memory sequentially, for example, with arrays
  2. PROGMEM is a Arduino AVR feature that has been ported to ESP8266 to ensure compatability with existing Arduino libraries, as well as, saving RAM. On the esp8266 declaring a string such as const char * xyz = this is a string will place this string in RAM, not flash. It is possible to place a String into flash, and then load it into RAM when it is needed. On an 8bit AVR this process is very.
  3. g Language There are several libraries built for Arduino whose functions take in character arrays as inputs instead of strings. Thankfully, Arduino has an inbuilt method ( toCharArray() ) to covert a String to a Character Array

Arduino String to Char* (Example) - Coderwal

  1. There are two ways to convert a String to a char pointer. The first is to call toCharArray() which copies all the characters to an array: // #3 char tmp [32] s. toCharArray (tmp, sizeof (tmp)); send (tmp); The second way is to call c_str() which returns a pointer to the internal buffer of the String: // #4 send (s. c_str ()); By calling c_str() we avoid a costly duplication, but we must be.
  2. The Arduino String, which lets us use a string object in a sketch. In this chapter, we will learn Strings, objects and the use of strings in Arduino sketches. By the end of the chapter, you will learn which type of string to use in a sketch. String Character Arrays. The first type of string that we will learn is the string that is a series of characters of the type char. In the previous.
  3. You can concatenate characters, and even integers and floats to strings (Arduino converts the integers and floating-point numbers to string internally). Examples can be seen in the below code. Example void setup() { Serial.begin(9600); Serial.println(); // put your setup code here, to run once: String s1 = Hello ; String s2 = Bond!; String s3 = s1 + s2; Serial.println(s3); s3 = s1 + 7.
  4. I find working with String the most simple thing to do in Arduino IDE, but char kills me. The sketch connects to a WiFi network, using the stored credentials from a .txt file inside the Flash Memory. It works
Using Arduino Struct | Circuit X Code

char *arr[ROW]; //array of pointer to string . You can see the below image in which I have created an array of pointer to a string whose size is 5. and each pointer is pointing to the address of the first character of the string. If you want to learn more about the c language, here 10 Free days C video course for you. Based on how you want to represent the array of strings, you can define a. In the following code we are assigning the address of the string str to the pointer ptr. char *ptr = str; We can represent the character pointer variable ptr as follows. The pointer variable ptr is allocated memory address 8000 and it holds the address of the string variable str i.e., 1000. Accessing string via pointer . To access and print the elements of the string we can use a loop and. Since each element of games array is a pointer to char or (char*), it can point to any string literal assigned to it. Some Invalid Operation on an Array of Pointers to Strings # Let's discuss some operations we can't perform directly in an array of pointers to string. Consider the following example: char * top_games [5]; When the compiler sees the above statement it reserves 20 bytes of memory.

arrays - tochararray - arduino string to char pointer

Arduino convert string to character array Circuits4you

Mit String Copy können wir den Inhalt eines Strings kopieren. *dest ist Zeiger auf Ziel-Array *src ist Zeiger auf Quell-Array; Rückgabewert ist char Zeiger auf Ziel-Array; Die Zeiger-Benennungen dest und src stehen für destinantion (Ziel) und source (Quelle). Diese Namen werden in den weiteren Kapiteln noch öfters auftreten How to use char with Arduino. Learn char example code, reference, definition. A data type used to store a character value. What is Arduino char This tutorial covers data type conversion in arduino.Data type conversion or typecasting means converting a value from one data type to other.For example, convert int to float, string to int etc. Data type covered in this section are int, float, char, char array, string and const char *

Riprendendo un precedente articolo su Arduino e le strighe oggi ti racconto di un test che ho eseguito nei giorni scorsi e che mi ha risolto molti problemi proprio nelle conversioni da char a string e viceversa.. Problema: Vorresti poter applicare uno dei metodi dell'oggetto String ad una variabile di tipo char, ad esempio estrarre solo una parte della stringa (substring) Returns a pointer to the first occurrence of str2 in str1, or a null pointer if str2 is not part of str1. The matching process does not include the terminating null-characters, but it stops there. Parameters str1 C string to be scanned. str2 C string containing the sequence of characters to match. Return Value A pointer to the first occurrence in str1 of the entire sequence of characters. Display a nul terminated string when given a pointer to the char array. Invokes an animation using PA_PRINT with all other settings (alignment, speed, etc) taken from current defaults. This method also invokes the animation for the print and returns when that has finished, so it blocks while the printing is happening, which should be at least one iteration of the wait loop. Parameters. str. I agree that the char casting method you have described above. However, the problem with it is that it does not transfer the real value of the integer, which is 5, to the character. Instead, what it does is transfer the ascii character equivalent of the value of the integer, to the character variable.. For instance, I want you to upload this code onto your arduino board and open the serial. Part 7 of Arduino Programming for Beginners. In this part we will work more with text or strings, for string (array of char) and String (object) will types

ESP8266 core for Arduino. Contribute to esp8266/Arduino development by creating an account on GitHub A pointer to the rest of the string after the last valid character is stored in the object pointed by endptr. A valid floating point number for strtof using the C locale is formed by an optional sign character (+ or -), followed by one of: A sequence of digits, optionally containing a decimal-point character (.), optionally followed by an exponent part (an e or E character followed by an.

How to format strings without the String class | C++ for

The difference char* the pointer and char[] the array is how you interact with them after you create them. If you are just printing the two examples will perform exactly the same. They both generate data in memory, {h,e,l,l,o,/0}. The fundamental difference is that in one char* you are assigning it to a pointer, which is a variable. In char[] you are assigning it to an array which is not a. Arduino array of strings (char arrays) Thread starter djsfantasi; Start date Jun 2, 2014; Search Forums; New Posts; Thread Starter. djsfantasi. Joined Apr 11, 2010 7,648. Jun 2, 2014 #1 I'm trying to figure out char arrays on the Arduino. I have a two dimensional array containing messages that I want to send out the serial port. One entry looks like: Rich (BB code): MoveCommand[5][20.

memory - How do string pointers work in Arduino? - Arduino

  1. Send text to a LCD connected to an Arduino and Ethernet shield set up as a web server. Two HTML text inputs are used to send strings to the 2 line by 16 character display from the Arduino hosted web page
  2. Syntax of strstr in C: char *strstr(const char *s1, const char *s2); Parameters: s1 − This is the pointer to a string to be scanned. s2 − This is the pointer to a string containing the sequence of characters to match
  3. g sketches for your Arduino board. Struct, short for structures, is a user-defined composite type that may include variables of different data types. Using structs in Arduino program
  4. convert a char* to string . convert a char* to string. gasp. Hello, first of all, I apologize for speaking so bad english, i am french and I try to improve english and C++ so... ;-) Then, I used the getline function to read a file. I would like to sort line (which are char*) by alphabetical order. Is it possible to convert char* to string? I found some functions like c_str but it doesn't.
  5. char *s = ; /* Create a pointer and have it point to an empty string. */ This is not the same as NULL. NULL means it points specificly to no place at all. This however is different. This is in fact pointing to an empty string literal. That's not null. Code: char *s = Hello!; /* Create a pointer pointing at a string literal. */ char *end = s + strlen( s ); /* Jump to the null character in.
  6. g, you often see code like this

Programming Arduino » Arrays; ID #1031 Passing arrays to functions. A big topic for beginners is how to write a function that can be passed an array. A very common way of achieving this is done using pointers. This method can be seen all through the C core in functions like memcpy(). Another way, which is the more natural choice for C++, but not as popular with beginners and C programmers is. In this chapter we'll study three workarounds, three ways to implement a function which attempts to return a string (that is, an array of char) or an array of some other type. In the last chapter, we looked at some code for converting an integer into a string of digits representing its value. This operation is the inverse of the function performed by the standard function atoi. Suppose we. Java Convert String to char. We can convert String to char in java using charAt() method of String class.. The charAt() method returns a single character only. To get all characters, you can use loop. Signatur Hello, I am trying to use the LMIC library for my ESP32 Heltec. I am getting the following errors: Arduino: 1.8.9 (Windows 10), Board: Heltec WiFi LoRa 32, Disabled, Default, 240MHz (WiFi/BT).. PROGMEM es una característica Arduino AVR que ha sido portada a ESP8266 para asegurar la compatibilidad con las librerías existentes en Arduino, así como para ahorrar RAM. En ESP8266 al declarar una cadena como const char * xyz = this is a string colocará esta cadena en la RAM, no en la flash. Es posible colocar una String en la flash, y después cargarla a la RAM cuando sea necesario.

integer array to char pointer string Stack Overflow. C Pointers and Strings C Programming DYclassroom Have fun View more . C Pointers and Strings C Programming DYclassroom Have fun char C = Hello; Why is this valid How can a pointer contain View more. char C = Hello; Why is this valid How can a pointer contain C Pointers and Strings C Programming DYclassroom Have fun. esp8266 / Arduino. Watch 956 Star 12k Fork 10.2k Code; Issues 227; Pull requests 70; Actions; Projects 3; Wiki ; Security; Insights; New issue Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Pick a username Email Address Password Sign up for GitHub. By clicking Sign up for GitHub, you agree to our terms. To copy one string to another, use strcpy(). strcpy received a pointer to each array of characters, or to be specific, to the first character in a NULL terminated array. Permalink Posted 10-Jun-17 4:33am. Michael Haephrati. Please Sign up or sign in to vote. Solution 2. Accept Solution Reject Solution. Try this: C++. char * buf = 12345; char logbuffer[1024]; struct xx { int a; char b[1024. We can directly assign the address of 1st character of the string to a pointer to char. This should be the preferred method unless your logic needs a copy of the string. C++14 // CPP program for the above approach. #include <cstring> #include <iostream> #include <string> using namespace std; // Driver Code . int main() { char* char_arr; string str_obj(GeeksForGeeks); char_arr = &str_obj[0.

c++ - pointer - string to const char arduino - Gelös

  1. •C-Strings Stefan Brass: Objektorientierte Programmierung Universit¨at Halle, 2006. 7. Arrays und Zeiger 7-2 Arrays (1) •Bisher konnen Variablen nur einen einzigen Wert (z.B. eine Zahl, ein Zeichen) enthalten. •F¨ur viele Berechnungen muß man sich aber eine ganze Anzahl von Werten merken. Beispiele: Zeichenketten bestehen aus mehreren Zeichen. Wenn man mit dem Sieb des Eratosthenes.
  2. macht das bereits ( er übergibt einen Pointer auf den String ), nur deine Funktion weis eben noch nicht, dass sie einen Pointer übergeben bekommt. Gruß, Franz-Peter 31.10.2017, 01:2
  3. The my_strcpy() function accepts two arguments of type pointer to char or (char*) and returns a pointer to the first string. In line 18, we have assigned the base address of the destination to start, this is necessary otherwise we will lose track of the address of the beginning of the string. In line 20, we have while loop, the while loops copies character from source to destination one by one.
  4. g language lacks a string variable, but it does have the char array, which is effectively the same thing. As an array, a string in C can be completely twisted, torqued, and abused by using pointers. It's a much more interesting topic than messing with numeric arrays. How to use pointers to display [
  5. If it is char*, that normally means the function might attempt to change the string, so you have to pass it a char buffer that is modifyable, and not just some character pointer. 1 1 Shar
Pointers in functions in c examples - control your

What people mean by string in C is a sequence of characters encoded in ASCII and stored in an array of char. And char is just an 8-bit integer. You may think A is for Apple, but to a computer, an A is just the number 65. But what exactly.. Java Convert String to char. We can convert String to char in java using charAt() method of String class.. The charAt() method returns a single character only. To get all characters, you can use loop. Signatur Mit strcat können wir Strings verketten, also aneinanderhängen. Das Ergebnis wird in dest gespeichert

In this blog post you're going to learn how to decode (parse a JSON string) and encode (generate a JSON string) with the ArduinoJson library using the Arduino with the Ethernet shield. This guide also works with the ESP8266 and ESP32 Wi-Fi modules with small changes For example, a String class would have a pointer to its data. If you duplicate that, then all the Strings in the array would point to the same string! So take care when using this with objects and structs, unless you know for sure that you can do a bitwise copying of the item. In any case, the resulting code here can make it easy to set up arrays with a single value - so when you want to. prog.cpp: In function 'int main()': prog.cpp:8: error: invalid const_cast from type 'const int*' to type 'char*' 5) const_cast can also be used to cast away volatile attribute. For example, in the following program, the typeid of b1 is PVKi (pointer to a volatile and constant integer) and typeid of c1 is Pi (Pointer to integer Strings are used to store text. They can be used to display text on an LCD or in the Arduino IDE Serial Monitor window. Strings are also useful for storing user input - for example the characters that a user types on a keypad connected to the Arduino


* a long string of characters like hello Arduino!. * Then Arduino informs the pc that it heard the whole sentence * * this is the first step for establishing sentence long conversations between arduino and the pc. * serialRead() reads one byte at a time from the serial buffer. * so in order to print out the whole sentence at once * (it is actually still printing one byte at a time but the pc. It is true that it does not normally make sense to compare a pointer and a string, but here strcmp is used to compare the string whose first element is pointed to by the pointer, with a string literal. Other than possible problems with what array[0] points to, it is perfectly fine. In fact, taking your suggestion of changing array to be a pointer to char is wrong: you would then be trying to. I wrote a function to reverse a char-array (string). Since I'm beginner and didn't work with malloc and stuff before, maybe someone could take a look, if this is fine, what I'm doing here? char* Stack Exchange Network. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and.

c++ string source code analysis - Programmer Sought

How to pass a string pointer to a function - Arduino Stack

dass der Ausdruck &eingabe[i] bei Strings vom Typ char* und bei Zahlen vom Typ int* ist. Arrays, Strings und Zeiger (Pointer) sind in C++ eng miteinander verknüpft. Daher betreten wir jetzt dieses interessante Gebiet der Zeiger, das für viele leider abschreckend wirkt. Zuvor fassen wir kurz zusammen: Bisher experimentierten wir mit einzelnen Array-Elementen eingabe[i], den zugehörigen. Copies the C string pointed by source into the array pointed by destination, including the terminating null character (and stopping at that point). To avoid overflows, the size of the array pointed by destination shall be long enough to contain the same C string as source (including the terminating null character), and should not overlap in memory with source

8 tips to use the String class efficiently C++ for Arduin

Using char* Here, str is basically a pointer to the (const)string literal. Syntax: char* str = This is GeeksForGeeks; Pros: Only one pointer is required to refer to whole string. That shows this is memory efficient. No need to declare the size of string beforehand. // CPP program to illustrate *char. #include <iostream> using namespace std; int main() { // pointer str points to const string. ArduinoJson is a JSON library for Arduino, IoT, and any embedded C++ project. It supports JSON serialization, JSON deserialization, MessagePack, streams, and fixed memory allocation. It has a simple API, it's easy to use, and it's trusted by thousands of developpers all over the world Every string must be terminated with a NULL (0x00, '\0') character to indicate the string has ended. You didn't hear it from me, but here's how you'd encode a string: var myVal = Hello ; var l = myVal . length (); byte payload [ l + 1 ]; //1 is added for the NULL character at the end of the string myVal . getBytes ( payload , l + 1 ) long strtol (const char * str, char The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is a null pointer, it is ignored. If the str is empty or does not have the expected form, no conversion is performed, and (if str_end is not a null pointer) the value of str is stored in the object pointed to by str_end. Contents.

Pointers, Arrays, and Functions in Arduino

Returns a value of type new_type. [] ExplanatioUnlike static_cast, but like const_cast, the reinterpret_cast expression does not compile to any CPU instructions (except when converting between integers and pointers or on obscure architectures where pointer representation depends on its type). It is purely a compile-time directive which instructs the compiler to treat expression as if it had. Displaying FLOAT variables in Arduino It seems that the Arduino software doesn't have much support for displaying float variables, certainly the sprintf() function doesn't work. However there is a useful c function called dtostrf() which will convert a float to a char array so it can then be printed easil Support for JsonVariantConst as input was added in ArduinoJson 6.15.2. Arguments. doc: the JsonDocument that will store the memory representation of the JSON document.. input: the JSON document to parse:. const char* is a string in RAM, it should be zero-terminated const __FlashStringHelper* is a Flash string, usually created with F() Stream is Arduino's I/O stream interface, implemented by What I am doing now is reading from a text file a string (char *). I wish to compare the value read into the array and determine which color it is from the enum data type. How can I compare a string like red to see if it exists in the values that are part of the enumerated data type 'color'? I know I need to write some kind of compare function, but I'm not getting anywhere figuring out how. Converting Float to String and Character Array in a Few Simple Steps - Arduino: Do you want to convert an floating point value to a string? If that is so, then there are two methods that i found really helpful

toCharArray() - Arduino Referenc

I'll read my GPS coordinates form my Arduino as a comma seperated buffer array. the data comes in as follow: You need to declare a char array to hold the GPS data which you probably already have, and then a string array, in this case msg_field[] with enough elements for each field in the char array - a field being the data between the commas. Twenty is sufficient for GPS data. C++. byte. In this tutorial I'll show you how to store an array into the Arduino EEPROM.. First we'll look at arrays composed of int numbers (2 bytes each), and then we'll do the same with long numbers (4 bytes each).. I strongly advise you to check how to store an int number into EEPROM before reading this tutorial. Here we'll focus mostly on working with arrays The objective of this post is to explain how to define structures on the Arduino core. This was tested both on the ESP32 and on the ESP8266. The tests on the ESP32 were performed using a DFRobot's ESP-WROOM-32 device integrated in a ESP32 FireBeetle board.. The tests on the ESP8266 were performed on a DFRobot's ESP8266 FireBeetle board Ein String ist im Wesentlichen eine Aneinanderreihung von einzelnen Zeichen, eine Zeichenkette; in dem Wort steckt char-Array ja schon quasi drin. Ein String-Literal wie Ich bin ein String! wird. Figure 1 - Sending a HTTP GET request to the ESP32 webserver with query parameters.. If you go back to the Arduino Serial monitor, you should have an output like figure 2, which shows the number of parameters, their names and their values getting printed to the console

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