Printing out of a C-programm

[Jakob Bucher]

My printer, Brother HL-2040, does not accept print-jobs out of a C-program. It works, however, perfectly on the lpr-command, with office applications and emacs.

System: openSuse Linux 13.1
Compiler: GNU C-compiler 4.8-2.1.2
Driver: Brother HL-2060-CUPS+Gutenprint v5.2.9
Options: Locale, Remote, Use as Default, Accept Print jobs, Enable printing

The printer can be opened as a file, but it does not react on the "putc" command  nor on fprintf.
Printer status: ready,  printing que emty;

What can be done?

Best regards

  J. Bucher