I'm doing a small project in C after quite a long time away from it. These happen to include some file handling. I noticed in various documentation that there are functions ... |
I've been trying to open a file and output text, but I keep getting errors. So I thought I would start at the very beginning and just try opening the ... |
I've been wondering about this one. Most books I've read shows that when you open a file and you found that the file is not existing, you should put an error ... |
Here's how I open a file for writing+ :
if( fopen_s( &f, fileName, "w+" ) !=0 ) {
printf("Open file failed\n");
return;
}
fprintf_s(f, "content");
If ... |
Fopen and Fclose are wrapper functions in my source file that check for errors when opening the file. when I run my program, it says there was an Fopen error. I ... |
I'm trying to make a program to open a file, called "write.txt".
#include <stdio.h>
main(){
FILE *fp;
fp = fopen("write.txt","w");
return 0;
}
Should this work? Because it returns nothing.
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I know it is a very basic thing, but I'm not very good at file handling in C.
I'm writing a custom error handler for something, and it needs to open a ... |
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I'm trying to implement the UNIX cat ">" command, to perform file1.txt > foo.txt from within my UNIX shell.
I want to take normal UNIX commands from user input and ... |
I don't find any difference through test.
What's the key to decide on this?
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Whenever I use open I get the permission denied error. But when I use fopen it opens the file fine. What is wrong with my code?
mode_t mode = S_IRUSR | S_IWUSR ...
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In comp.lang.c, magicman wrote: Is difference lies in the fact that fopen part of c library and platform in-depended, whereas open is a system call? what about functionalities? With respect to the C standard, fopen() is defined by the standard, takes specific arguments, performs a specific function, and returns specific results, while open() is *not* defined (or even recognized) by the ... |
I merged the threads since they are dealing with the same problem. Next time if you think your problem has been forgotten/overlooked rather than start a new thread please put a new post into the current thread so that it pops up to the top of the list and appears in my list of subscribed threads. Ta Ben |
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First of all your program just differs in return type of open But by your question in words i can say FOPEN fopen is available on any hosted ANSI C system and operates according to ANSI C. The existence and semantics of open depend on each system. On Unix, open and related function (such as lseek, read, write) each results in ... |
i'm using an old version of a lattice c compiler, but it works for everything i need so far, but.. i'm trying to open 2 files , each with its own FILE *fp1,fp2 pointer. Unless I fclose one I cannoy open two files at the same time. I have FILES=10 in my config.sys, running DOS 6.22 Any ideas? thanks |
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First of all, I suggest that you read the manual and find out the difference between these functions yourself, by searching the web for "unix man function()". Since you are starting out, I'd suggest that you learn how to use file streams. Functions which use file streams in your list include fopen and fread. Streams are a more robust interface for ... |
Code: #include int getrec(FILE *); main(int argc, char *argv[]) { int n; unsigned recno = 0; /* number of records */ int minrec; /* smallest */ int maxrec; /* largest */ long cumrec = 0; /* cumulative size */ FILE *dfp; /* file to analyse */ char started = 0; if(argc != 2) { printf("Usage : fil2 f\n"); exit(1); } ... |
22. open, fopen ? cboard.cprogramming.com |
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#include #include #include #include #include #include int main() { int fd1, fd2; char *buffer; fd1 = open( "dude.dat", O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR ); fd2 = open( "dude.dat", O_RDONLY ); write( fd1, "UNIX", 5 ); read( fd2, buffer, 5 ); printf("%s\n", buffer ); close( fd1 ); close( fd2 ); exit(0); } |
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//from grades.c int main(int argc, char* argv[]) { char **IDs, **labels; int **scores, rows = 10, cols = 12, index, a; FILE* fp; if (argc != 2) { printf("usage: grades.out filename\n"); return EXIT_FAILURE; }//if fp = fopen(argv[1],"r"); a = read_file(&scores, &IDs, &labels, &rows, &cols, fp); if ( a == 0 ) { printf("Error: %s cannot be opened.\n",argv[1]); return EXIT_FAILURE; }//if //from ... |
#include #include int main() { FILE *inFile; char fileName[13]; char text; printf("\nEnter a file name: "); gets(fileName); inFile = fopen(fileName, "r"); /*This opens the file */ if (inFile == NULL) /*Checks that the file exists*/ { printf("\nThe file %s was not opened successfully.", fileName); printf("\nPlease check that you entered the file name correctly.\n"); exit(1); } while (fscanf(inFile, "%s", text) ... |