c语言之分割与合并文件

一.本文主要内容是分割一个与合并几个文件，使用c语言实现

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

/*文件分割,path为要分割的文件路径name为文件名，count为分割数量，savepath为保存路径，返回-1表示分割失败,0表示成功*/
int splitFile(char *path, int count, char *savepath, char *savename)
{
	FILE *F = fopen(path,"rb");
	if (F == NULL)
	{
		return  -1;
	}
	else
	{
		fseek(F, 0, SEEK_END);//将文件指针移动到文件末尾
		int length = ftell(F);//计算文件指针到文件开头的字节数，即就是文件大小
		int yushu = length % count;//余数
		int size = length / count; //前面count-1份每一分大小为size，最后一份为size + yushu
		for (int i = 1; i <= count; i++)
		{
			char savefile[100];
			sprintf(savefile, "%s%d%s", savepath, i, savename);
			printf("%s", savefile);
			FILE *P = fopen(savefile, "wb");
			if (P == NULL)
			{
				fclose(F);
				return -1;
			}
			else
			{
				fseek(F, (i - 1)*size, SEEK_SET);
				if (i == count)
				{
					for (int j = 0; j <= size + yushu; j++)
					{
						int c = fgetc(F);
						fputc(c, P);
					}
				}
				else
				{
					for (int j = 0; j < size; j++)
					{
						int c = fgetc(F);
						fputc(c, P);
					}
				}


			}
			fclose(P);
		}
		fclose(F);
		return 0;
	}

}
/*合并文件，将文件list中每一行指定的文件按行顺序合并为一个大文件bigfile返回-1表示分割失败,0表示成功*/
int mergeFile(char *list,int count,char *bigfile)
{
	FILE *F = fopen(list, "r");
	FILE *BF = fopen(bigfile, "wb");
	if (F == NULL || BF == NULL)
	{
		printf("打开文件失败");
		return -1;
	}
	else
	{
		
		for (int i = 0; i < count; i++)
		{
			char str[200];
			fgets(str, 200, F);//每次读取一行字符串，读到末尾为0
			printf("%s", str);
			int len = strlen(str);
			str[len - 1] = '\0';
			printf("%s", str);
			FILE *P = fopen(str, "rb");
			if (P == NULL)
			{
				printf("打开文件失败");
				fclose(F);
				fclose(BF);
				return -1;
			}
			else
			{
				int c = fgetc(P);
				while (c != EOF)
				{
					
					fputc(c, BF);
					c = fgetc(P);
				}
			}
			fclose(P);


		}



	}
	fclose(F);
	fclose(BF);
	return 0;
}

void main()
{
	//int i = splitFile("F:\\文件分割与合并.mp4", 4, "F:\\", "文件分割与合并.mp4");
	//printf("%d", i);
	mergeFile("F:\\list.txt",4, "F:\\he.mp4");
	system("pause");
}

2.效果截图

3.list文件内容