Question

I am trying to create a project using Tesseract in something other than Visual Studio but there doesn’t seem to be any documentation on how to go about doing this.

The problem I am at now is that file scanutils.cpp calls a function open(char *, int, mode_t) and this isn’t defined anywhere. Is this possibly a Unix function that slipped by or should be located somewhere on my machine?

Thank you.

Edit: I have found that the open function is including using the fcntl.h file in Unix, but the version of it that I have (C++ Builder) does not include the open function. I could just define teh open function in my own file as it is in Unix, but that seems a little reckless. Any suggestions?

Answer 1

open() is a Posix function that usually wraps the open system call in conforming systems. This is a rather “low-level” function that is very platform specific.

The portable C function that provides the equivalent functionality is fopen(), in the sense that the result of open() is the same as FILE * fp = fopen(...); int fd = fileno(fp); — here fd is the integer returned by the underlying open() call.

The standard C functions fwrite() and fread() map to Posix functions read() and write(), by the way.

Try to stick with standard C functions and FILE* data structures as much as possible for maximum portability. If necessary, you can always obtain the Posix file descriptor via fileno().