C Tutorial/stdio.h/fread — различия между версиями
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Версия 14:21, 25 мая 2010
fread
Item Value Header file stdio.h Declaration size_t fread(void *buf, size_t size, size_t count, FILE *stream); Function reads count number of objects by size and stores them in *buf. Return returns the number of items actually read.
- Use feof() to determine the end of file.
- Use ferror() to determine the error.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fp;
float bal[5] = { 1.1F, 2.2F, 3.3F, 4.4F, 5.5F };
int i;
if((fp=fopen("test", "wb"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
if(fwrite(bal, sizeof(float), 5, fp) != 5)
printf("File read error.");
fclose(fp);
if((fp=fopen("test", "rb"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
if(fread(bal, sizeof(float), 5, fp) != 5) {
if(feof(fp)) {
printf("Premature end of file.");
}else {
printf("File read error.");
}
}
fclose(fp);
for(i=0; i<5; i++){
printf("%f ", bal[i]);
}
return 0;
}