54.文件按大小切割

运行结果:

完整代码:

#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>

#define sorPath "111.doc"
char **stoPath;

//获取文件大小
int getSize(char *path)
{
    FILE *pf = fopen(path, "r");

    if (pf)
    {
        fseek(pf, 0, SEEK_END);
        int length = ftell(pf);
        fclose(pf);
        return length;
    }

    return 0;
}

//切割文件
void devide(char *path,int n)
{
    //分配n个地址
    stoPath = (char **)malloc(sizeof(char *) * n);
    //每个地址分配内存,并且初始化
    for (int i = 0; i < n; i++)
    {
        stoPath[i] = (char *)malloc(1024);
        sprintf(stoPath[i], "%d.doc", i);
        printf("%s
", stoPath[i]);
    }

    //二进制打开源文件
    FILE *pfr = fopen(path, "rb");
    //获取大小
    int totalSize = getSize(path);

    //如果能被整除
    if (totalSize%n == 0)
    {
        for (int i = 0; i < n; i++)
        {
            FILE *pfw = fopen(stoPath[i], "wb");
            for (int j = 0; j < totalSize / n; j++)
            {
                fputc(fgetc(pfr), pfw);
            }
            fclose(pfw);
        }
    }
    else
    {
        //如果不能被整除
        for (int i = 0; i < n - 1; i++)
        {

            FILE *pfw = fopen(stoPath[i], "wb");
            for (int j = 0; j < totalSize / n; j++)
            {
                fputc(fgetc(pfr), pfw);
            }
            fclose(pfw);
        }

        FILE *pfw = fopen(stoPath[n-1], "wb");
        int left = totalSize - (totalSize / n) * (n - 1);
        for (int i = 0; i < left; i++)
        {
            fputc(fgetc(pfr), pfw);
        }
        fclose(pfw);
    }
    fclose(pfr);
}

//合并
void merge(char *path, int n)
{
    FILE *pfw = fopen(path, "wb");

    for (int i = 0; i < n; i++)
    {
        FILE *pf = fopen(stoPath[i], "rb");
        if (pf)
        {
            int ch;
            while ((ch = fgetc(pf)) != EOF)
            {
                fputc(ch, pfw);
            }
        }
        fclose(pf);
    }
    fclose(pfw);
}

void main()
{
    int length = getSize(sorPath);

    printf("%d
", length);
    devide(sorPath, 10);
    merge("last.doc", 10);
    system("pause");
}