| ??? 01/16/07 08:03 Read: times |
#130849 - Do not hard-code adresses! Responding to: ???'s previous message |
Ellappan Varadharaj said:
i have the doubt about how to specify the port address of the pc while we interconnect with the microcontroller. 1.how to specify serial port address of the pc in the program. 2.how to specify parallel port address of the pc in the program. You should never hard-code addresses! ALL PC operating systems have always given the ports names like COM1: or LPT1: - use them! The use of hard-coded addresses and direct access to the physical hardware is a key reason why old DOS software no longer works under modern operating systems like Win-NT and later... Even in the days of DOS, such applications were inflexible, non-portable and often conflicted with other stuff on the PC. The easiest way is to just put up a dialogue box for the user to enter the desired COM: or LPT: port number: I said:
Do not arbitrarily restrict the COM: or LPT: port number!
See: http://www.8052.com/forum/read.phtml?id=128508 You could then use a registry key or INI file to record this as the default for future use... http://www.8052.com/forum/read.phtml?id=130848 |
| Topic | Author | Date |
| doubt about ports | 01/01/70 00:00 | |
| and one more doubt | 01/01/70 00:00 | |
| Programming the PC | 01/01/70 00:00 | |
| Off Topic | 01/01/70 00:00 | |
| Wrong forum | 01/01/70 00:00 | |
| Win ports | 01/01/70 00:00 | |
| Bad practice... | 01/01/70 00:00 | |
| Bad practice | 01/01/70 00:00 | |
| some thoughts | 01/01/70 00:00 | |
| Do not hard-code adresses! | 01/01/70 00:00 | |
| You need to tell us more ... | 01/01/70 00:00 | |
| MS-DOS | 01/01/70 00:00 | |
| why? | 01/01/70 00:00 | |
| Misunderstanding ? | 01/01/70 00:00 | |
| Not quite so | 01/01/70 00:00 | |
| a parallel in '51 | 01/01/70 00:00 | |
| Sharing | 01/01/70 00:00 | |
| OK, the sad facts | 01/01/70 00:00 | |
| MS-DOS will allow and do anything the PC can do | 01/01/70 00:00 | |
| ...and the reason is ... | 01/01/70 00:00 | |
| If Windows were truly multi-user/multitasking ... | 01/01/70 00:00 | |
| it's broken | 01/01/70 00:00 | |
| So much for the "Good Old Days" | 01/01/70 00:00 | |
| Yes, and the ones that worked, worked really well | 01/01/70 00:00 | |
The Right one | 01/01/70 00:00 |