fread returns -1

I am trying to read a .dcr binary file. We have used this script for this function many times before and it has worked well. This specific .dcr file is giving us trouble.

I open the file using fopen, then run the fread command to read the bits.

A = fread(fid,1,'long');

A =

-1

When does fread return a negative number? It should be reading 32 bits of zeros and ones. What bit does it read as the sign? or does it indicate a different error?

[Ameer Hamza]

'long' indicates a signed integer. Why do you expect it to not be negative? If it is unsigned, then use 'ulong'.

Answer 1

[Star Strider]

Since 'long' indicates a 32-bit signed integer, and you are returning 1 value, that is likely what the function is reading.

That is what I would assume.