在 Java 中加载 C 签名长

Question

I have a 4-byte signed long variable in C/C++ which is saved in a file using memcpy.

File content: "31E04CFB".

I need to load this value in Java, but Java's int (4 bytes) and C++'s long have different memory structures. Is there any library which will help me with this, or I have to code it myself?

Answer 1

Are you the one writing the file? Do you understand about big-endian versus little-endian?

If you want a portable file, writing raw bytes isn't how you do it. Do you have the choice of a different file format?

If so, consider it. Store it as a string instead of raw bytes.

If not, then you need to understand the big-endian /little-endian status on the hardware you're using, and it will NOT be portable.