@TomHoe said in Int16 to QByteArray: didn't knew that '!' is the same as 0x21.. See http://www.ascii-code.com/ '!' == 33 == 0x21 == 0b00100001 @TomHoe said in Int16 to QByteArray: Is there a way to rewrite it to regular hex codes ? Or does every controller understand this notation ? Again, '!' == 33 == 0x21 == 0b00100001 Those are different ways of displaying the same bytes. The controller does not see any "hex" or "notation"; it only sees the sequence of 0's and 1's. I recommend you learn about how bits/bytes are stored in computer memory: http://statmath.wu.ac.at/courses/data-analysis/itdtHTML/node55.html

@Dan90 You are assigning a value to a pointer, but data is actually an array of "unsigned char": unsigned char *data = 0b10000000; Instead you should do (C++11): unsigned char data[] = { (unsigned char)0b10000000 };

Thanks, that should do it!

@JKSH Copy that. Thanks a lot for your kind help.

Thank you very much :-) You gave me the right hint. There was a cast before which I did not see. And since everything was casted to int MySQL deleted the Zeros after the '.' Now everything works fine and thanks for the other variation :-)

@mcosta Hi, I'll certainly take a look at it. So I guess it's not only changing the font xD Thank you.