库函数调用 4--fwrite

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本文演示了使用C语言的fread和fwrite函数进行文件读写操作，通过实例展示了如何从一个文件读取数据并将其写入另一个文件。

#include <stdio.h>



/************************
*name:fwrite.c
*author:QG
*time:2015-05-12
*description:
***************************/



int main()
{
    FILE *fp_in;
    FILE *fp_out;
    char *in_file_name = "./123.txt";
    char *out_file_name = "./234.txt";
    int a = 1;
    int b = 0;
    int c = 0;
    char c_buf[10];
    fp_in = fopen(in_file_name,"r+");

    b = fread(c_buf,1,9,fp_in);
    c_buf[9] = '\0';
    printf("read %d types from 123.txt!\n",b);
    printf("read content is :%s!\n",c_buf);

    fp_out = fopen(out_file_name,"w+");
    c = fwrite(c_buf,1,9,fp_out);
    printf("write %d types to 234.txt!\n",c);

    a = fclose(fp_in);
    fclose(fp_out);
    if(a == 0)
    {
        printf("close OK!\n");
    }
    else if(a == EOF) 
    {
        printf("close fail!\n");
    }
    return 0;
}