user1437099 user1437099 - 3 months ago 31
C++ Question

Store hex value as string (Arduino project)

I'm working on an Arduino project and I want to store a hex value as string.

eg: Hex is C697C63B

for (byte i = 0; i < bufferSize; i++) {
Serial.print(buffer[i], HEX);
}


I would like to store the String as
x = "C697C63B";


String CardID = "";
for (byte i = 0; i < bufferSize; i++) {
CardID += (buffer[i],HEX);
Serial.println(CardID);
}


But the Sting is stored as
CardID = 16161616


Sorry I just start C++ for a week and I spend 3 day already just to find answer.

Okay i found the answer now thank you everyone that help

String CardID = "";
for (byte i = 0; i < bufferSize; i++)
CardID += String(buffer[i], HEX);
Serial.print(CardID);

Answer

You should use an ostringstream:

auto outstr = std::ostringstream{};
outstr << std::hex << 0xC697C63Bul;
auto myHexString = outstr.str();
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