切割与合并和增删改查

1.对文件的切割与合并

#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
char path[1024] = "C:\\Users\\yincheng01\\Desktop\\test\\切割与合并\\Q.jpg";
//C:\\Users\\yincheng01\\Desktop\\test\\切割与合并\\Q1.exe
////C:\\Users\\yincheng01\\Desktop\\test\\切割与合并\\Q2.exe


int getfilesize(char *path)
{
    FILE *pf = fopen(path, "rb");
    if (pf==NULL)
    {
        return -1;
    } 
    else
    {
        fseek(pf, 0, SEEK_END);//移动尾部
        int size = ftell(pf);//当前指针距离文件开头的长度
        fclose(pf);//获取文件大小
        return size;
    }
}


void space(char *path, int n)
{
    char **pathes;
    pathes = malloc(sizeof(char*)*n);//开辟指针数组
    for (int i = 0; i < n; i++)
    {
        pathes[i] = malloc(sizeof(char) * 1024);
        sprintf(pathes[i], "C:\\Users\\yincheng01\\Desktop\\test\\切割与合并\\Q%d.jpg", i + 1);
        //printf("\n%s", pathes[i]);//显示路径
    }

    FILE *pf = fopen(path, "rb");
    if (pf == NULL)
    {
        return ;
    }
    else
    {
        int size = getfilesize(path);//获取文件大小

        //100  10  10
        //100  8   100/7  14×7+2=100
        if (size%n==0)
        {
            for (int i = 0; i < n;i++)
            {

                FILE *pfw = fopen(pathes[i], "wb");//写入
                for (int j = 0; j < size / n;j++)
                {
                    fputc(fgetc(pf), pfw);//读取一个字符，写入

                }
                fclose(pfw);
            }

        } 
        else
        {
            for (int i = 0; i < n - 1;i++)
            {
                FILE *pfw = fopen(pathes[i], "wb");//写入
                for (int j = 0; j < size / (n- 1);j++)
                {
                    fputc(fgetc(pf), pfw);//读取一个字符，写入
                }
                fclose(pfw);
            }
            {
                FILE *pfw = fopen(pathes[n-1], "wb");//写入
                for (int i = 0; i < size%n;i++)
                {
                    fputc(fgetc(pf), pfw);//读取一个字符，写入
                }



                fclose(pfw);
            }


        }



        fclose(pf);

    }


}
void merge(char *newpath, int n)
{
    char **pathes;
    pathes = malloc(sizeof(char*)*n);//开辟指针数组
    for (int i = 0; i < n; i++)
    {
        pathes[i] = malloc(sizeof(char) * 1024);
        sprintf(pathes[i], "C:\\Users\\yincheng01\\Desktop\\test\\切割与合并\\Q%d.jpg", i + 1);
        //printf("\n%s", pathes[i]);//显示路径
    }

    FILE *pfw = fopen(newpath, "wb");
    for (int i = 0; i < n;i++)
    {
        int length = getfilesize(pathes[i]);
        if (length==-1)
        {
            return;
        } 
        else
        {
            FILE *pfr = fopen(pathes[i], "rb");
            for (int j = 0; j < length;j++)
            {
                fputc(fgetc(pfr), pfw);//写入
            }
            fclose(pfr);

        }


    }
    fclose(pfw);



}


void main()
{
    int num;
    scanf("%d", &num);//分割为num块
    space(path, num);
    merge("C:\\Users\\yincheng01\\Desktop\\test\\切割与合并\\MMMM.jpg", num);


    system("pause");
}

 

2.文本文件的增删改查

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


void main查询()
{
    FILE *pfr = fopen("C:\\Users\\yincheng01\\Desktop\\code\\10.txt", "r");
    FILE *pfw = fopen("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "w");

    while (!feof(pfr))
    {
        char str[128] = { 0 };
        fgets(str, 128, pfr);//读取
        char *p = strstr(str, "王鹏飞");
        if (p!=NULL)
        {
            printf("%s", str);
        }

    }

    fclose(pfr);
    fclose(pfw);




    system("pause");
}
void main修改()
{
    FILE *pfr = fopen("C:\\Users\\yincheng01\\Desktop\\code\\10.txt", "r");
    FILE *pfw = fopen("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "w");

    while (!feof(pfr))
    {
        char str[128] = { 0 };
        fgets(str, 128, pfr);//读取
        char *p = strstr(str, "王鹏飞");
        if (p != NULL)
        {
            printf("%s", str);
            fputs( "上联：六问赵学辉有多愁. 下联：恰似跑堂杂役在青楼. 横批: 看别人射\n" , pfw);
        }
        else
        {
            fputs(str, pfw);
        }

    }

    fclose(pfr);
    fclose(pfw);

    remove("C:\\Users\\yincheng01\\Desktop\\code\\10.txt");//删除
    rename("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "C:\\Users\\yincheng01\\Desktop\\code\\10.txt");//重命名


    system("pause");
}
void main删除()
{
    FILE *pfr = fopen("C:\\Users\\yincheng01\\Desktop\\code\\10.txt", "r");
    FILE *pfw = fopen("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "w");

    while (!feof(pfr))
    {
        char str[128] = { 0 };
        fgets(str, 128, pfr);//读取
        char *p = strstr(str, "赵学辉");
        if (p != NULL)
        {
            
        }
        else
        {
            fputs(str, pfw);
        }

    }

    fclose(pfr);
    fclose(pfw);

    remove("C:\\Users\\yincheng01\\Desktop\\code\\10.txt");//删除
    rename("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "C:\\Users\\yincheng01\\Desktop\\code\\10.txt");//重命名


    system("pause");
}

void main()
{
    FILE *pfr = fopen("C:\\Users\\yincheng01\\Desktop\\code\\10.txt", "r");
    FILE *pfw = fopen("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "w");

    while (!feof(pfr))
    {
        char str[128] = { 0 };
        fgets(str, 128, pfr);//读取
        char *p = strstr(str, "八问中国男足有多愁");
        if (p != NULL)
        {
            //fputs("上联：十问王鹏飞几多愁. 下联：恰似一群凤姐上青楼. 横批：只能用手\n", pfw);
            fputs(str, pfw);
            fputs("上联：二问中国男足有多愁. 下联：恰似王鹏飞守青楼. 横联: 总是被射\n", pfw);

        }
        else
        {
            fputs(str, pfw);
        }

    }

    fclose(pfr);
    fclose(pfw);

    remove("C:\\Users\\yincheng01\\Desktop\\code\\10.txt");//删除
    rename("C:\\Users\\yincheng01\\Desktop\\code\\temp.txt", "C:\\Users\\yincheng01\\Desktop\\code\\10.txt");//重命名


    system("pause");