Question

谢谢啦,写出fopen(),fread()函数参数以及返回值的数据类型及含义？

C语言

Answer 1

FILE * fopen ( const char * filename, const char * mode );
size_t fread ( void * ptr, size_t size, size_t count, FILE * stream );
//fopen返回值是文件指针
//fread 返回值是读到的元素个数
//size_t size,要读取的每个元素的字节大小
// size_t count 元素个数
/* fread example: read a complete file */
#include <stdio.h>
#include <stdlib.h>

int main () {
FILE * pFile;
long lSize;
char * buffer;
size_t result;

pFile = fopen ( "myfile.bin" , "rb" );
if (pFile==NULL) {fputs ("File error",stderr); exit (1);}

// allocate memory to contain the whole file:
buffer = (char*) malloc (sizeof(char)*lSize);
if (buffer == NULL) {fputs ("Memory error",stderr); exit (2);}

// copy the file into the buffer:
result = fread (buffer,1,lSize,pFile);
if (result != lSize) {fputs ("Reading error",stderr); exit (3);}

/* the whole file is now loaded in the memory buffer. */

// terminate
fclose (pFile);
free (buffer);
return 0;
}

Answer 2

任务占坑