How can I use IRsend with a string or convert a char from serial to uint32_t?

Question

I'm trying to control my arduino with a raspberry pi with python instead of C++ (which I don't know). I've found code to take a string from serial and print it, but instead I'd like to use IRsend to use the code. Unfortunately I'm getting the error invalid conversion from 'char*' to 'uint32_t {aka long unsigned int}' [-fpermissive]. I know this must be an incredibly dumb question but is there a int() function for uint32_t for arduino C++? that I could set blah=uint32_t(buf) and then use my irsend.sendNEC(buf, 32)? If it's not painfully obvious, I don't know C++ and my python isn't great.

#include <IRremote.h>
char buf[80];
int readline(int readch, char *buffer, int len) {
 static int pos = 0;
 int rpos;
 if (readch > 0) {
 switch (readch) {
 case '\r': // Ignore CR
 break;
 case '\n': // Return on new-line
 rpos = pos;
 pos = 0; // Reset position index ready for next time
 return rpos;
 default:
 if (pos < len-1) {
 buffer[pos++] = readch;
 buffer[pos] = 0;
 }
 }
 }
 return 0;
}
void setup() {
 Serial.begin(115200);
}
IRsend irsend;
void loop() {
 if (readline(Serial.read(), buf, 80) > 0) {
 Serial.print("You entered: >");
 Serial.print(buf);
 Serial.println("<");
 irsend.sendNEC(buf, 32);
 
 }
}

Error:

/home/pi/Desktop/sendIRfromserial2addingir/sendIRfromserial2addingir.ino: 39:27: warning: invalid conversion from 'char*' to 'uint32_t {aka long unsigned int}' [-fpermissive]
 irsend.sendNEC(buf, 32);
 
 
 ^

In file included from

/home/pi/Desktop/sendIRfromserial2addingir/sendIRfromserial2addingir.ino:1:0:
/home/pi/Arduino/libraries/IRremote/src/IRremote.h:444:10: note: initializing argument 1 of 'void IRsend::sendNEC(uint32_t, uint8_t, bool)'
 void sendNEC(uint32_t data, uint8_t nbits, bool repeat = false);
 ^~~~~~~`

Answer 1

Instead of

irsend.sendNEC(buf, 32);

cast it to an unsigned int32 type:

irsend.sendNEC((uint32_t) buf, 32);

• Johnny Derpp: That works! Thank you so much! It's sad how much time I spent looking for an answer. I think it's too simple of a question to have been asked before.
• Michel Keijzers: Maybe but it's ok ... Welcome anyway, next time also use ctrl-k to align your code and I advise to read a book about C/C++, it will help you greatly using the Arduino. Good luck with your project.