jschell wrote: you write 6 bytes to that you have a problem. Of course, but not an exception. Which is why you are always reminded to use the strxxx_s versions which include bounds checking. But you have to work quite hard to write past the beginning of a buffer.

The interface are very simple, but are all C++ classes and i use MFC functions and classes. I take a look to all proposed solutions. Thanks to all very much.

Friends will work but you should always be aware of the coupling that introduces into your design.

Today i'm find the correct way to work; i don't know why, but i'm fixed on the way to count time for starts screen saver inside my application, so i need hooks; i try to use hooks (i need global hook) and it works, but i think it's better in another way: the correct way is leave the screen saver administration to the system and enable it or disable it when occurs; the correct way is: - Read if the screen saver is enabled from the system (so i know if i have to use it) - If disabled i do nothing - If enabled, disable it - Run all on my application - If device is sleeping for 1 minute, enable screen saver and reset counting - If device is current in use, disable screen saver and reset counting The rest it' better leave to the system: in this way i have only a delay of one minute for screen saver starting. Now it works fine; i'm sorry for these post. Thank you Drugo

I try to change printer and now i don't have no more exception. Thank you so much for your answer. Bye Drugo