Mega Code Archive
Fopen
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Item Value
Header#include
DeclarationFILE *fopen(const char *fname, const char *mode);
Functionopens a file by *fname
Returnreturns a FILE pointer on success or NULL pointer on failure
The legal values for mode.
ModeMeaning
"r"Open text file for reading
"w"Create a text file for writing
"a"Append to text file
"rb"Open binary file for reading
"wb"Create binary file for writing
"ab"Append to a binary file
"r+"Open text file for read/write
"w+"Create text file for read/write
"a+"Open text file for read/write
"rb+" or "r+b"Open binary file for read/write
"wb+" or "w+b"Create binary file for read/write
"ab+" or "a+b"Open binary file for read/write
The correct method of opening a file:
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
FILE *fp;
if ((fp = fopen("test", "w"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
fclose(fp);
}
This fragment opens a file called TEST for binary read/write operations:
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
FILE *fp;
if((fp=fopen("test", "rb+"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
fclose(fp);
}
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