I am trying to do a C program that will be able to grab data from an RS-232 port to a PC and then save whatever data into a text file.... The RS-232 port will keep sending its data out to the PC, so I need to overwrite the text file when a new data is sent to the PC. Can someone tell me how to program this in C?
Thanks...
Start with which OS and compiler you are using...
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
windows xp and GNU C compiler
Oh great, we get to play 20 questions just to figure out your environment
Which gcc compiler
- cygwin
dev-c++
DJGPP
All have gcc at the heart of them
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
hehe.... sorry.... it's cygwin
how do u check it????
>>how do u check it????
Try it I don't have Windows installed, I'm not sure.Code:#include <stdio.h> #include <stdlib.h> int main() { char c,*fn=(char *)malloc(5); FILE *fp; fn="COM1:" if ((fp=fopen(fn,"r"))!=NULL) { while ((c=(char)getc(fp))!=EOF) putc(c,stdout); fclose(fp); } else printf("file not found.\n"); free(fn); return 0; }
> fn="COM1:"
This loses the memory you malloc'ed
The cast of malloc is not recommended either.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
>>The cast of malloc is not recommended either.
Thanks for that as I use gcc 3.2.2 and sometimes gcc 2.95 (old redhat). The second one need casting. It never compile without casting. So it turns into my habit.
Anyway I'll change
