How do you read in a 3 byte size value as an integer in c++?

c++ int byte id3
carboncomputed picture carboncomputed · Mar 27, 2012 · Viewed 13.9k times · Source

I'm reading in an id3 tag where the size of each frame is specified in 3 bytes. How would I be able to utilize this value as an int?

Answer

Carl Norum picture Carl Norum · Mar 27, 2012

Read each byte and then put them together into your int:

int id3 = byte0 + (byte1 << 8) + (byte2 << 16);

Make sure to take endianness into account.

Related questions

Easiest way to convert int to string in C++

What is the easiest way to convert from int to equivalent string in C++. I am aware of two methods. Is there any easier way? (1) int a = 10; char *intStr = itoa(a); string str = string(intStr); (2) int a = 10; stringstream ss; ss &…

Read More
How can I convert a std::string to int?

Just have a quick question. I've looked around the internet quite a bit and I've found a few solutions but none of them have worked yet. Looking at converting a string to an int and I don't mean ASCII codes. …

Read More
How to concatenate a std::string and an int?

I thought this would be really simple but it's presenting some difficulties. If I have std::string name = "John"; int age = 21; How do I combine them to get a single string "John21"?

Read More