思路
切割
读取文件，按输入大小进行切割，截取文件名做为切割文件名，并把切割的各个文件名存到./data/filelist.txt中
合并
读取./data/filelist.txt中的分割文件名，循环读取文件，并写进新的文件中。
流程图
代码
菜单
void DispalyMenu(){
printf("==============请选择功能==============\n");
printf("= 1.切割 =\n");
printf("= 2.合并 =\n");
printf("= 3.退出 =\n");
printf("======================================\n");
return;
}
主函数
int main(int argc,char* argv[])
{
char option;
DispalyMenu();
scanf("%c",&option);
while(1){
switch(option){
case '1': FileCutting();break;
case '2': FileMerge();break;
case '3': exit(0);
default: exit(0);
}
DispalyMenu();
getchar();
scanf("%c",&option);
}
return 0;
}
字符串切割
传入传字符，以"."为条件结束，最后只返回文件名。
char * NameSqlit(char *filename){
char *name;
int n = strlen(filename);
int i = 0;
name = (char *)malloc(n-4);
while(*(filename+i) != '.'){
*(name+i) = *(filename+i);
i++;
}
*(name+i) = '\0';
return name;
}
文件切割
int FileCutting(){
FILE *fpr; /*读文件指针*/
FILE *fpw; /*写文件指针*/
FILE *fplist; /**/
char file_name[20];
int file_id; /*新文件名id，001,002*/
int n = 0;
long offset; /*文件指针位置*/
long fsize; /*文件大小*/
long fblock = 0; /* 1 M */
char data;
unsigned int size_r;
printf("请输入文件名\n");
scanf("%s",file_name);
printf("请输入切割大小(输入50则拆分50K一份)\n");
scanf("%d",&n);
//printf("%s",NameSqlit(file_name));
if(NameSqlit(file_name) == "" || n == 0){
printf("输入有误，程序退出\n");
return 0;
}
fblock = 1024 * n;
fpr = fopen(file_name,"rb");
if(!fpr)
{
printf("文件打开失败！\n");
return 0;
}
offset = 0;
fseek(fpr,0,SEEK_END);
fsize = ftell(fpr);
fseek(fpr,0,SEEK_SET); /*返回文件头*/
size_r = fread(&data,sizeof(char),1,fpr);
file_id = 1;
sprintf(file_name,"%s.%03d",NameSqlit(file_name),file_id); /* demo.001 */
fpw = fopen(file_name,"wb"); /*创建新文件*/
fplist = fopen("./data/filelist.txt","w");
while(size_r>0)
{
/*写入新的文件*/
fwrite(&data,sizeof(char),1,fpw);
offset = ftell(fpr);
if(offset % fblock == 0)
{
/*结束当前文件，建立新文件*/
fclose(fpw);
fputs(file_name,fplist);
fputs("\n",fplist);
file_id++;
sprintf(file_name,"%s.%03d",NameSqlit(file_name),file_id); /* demo.00x */
fpw = fopen(file_name,"wb"); /*创建新文件*/
}
size_r = fread(&data,sizeof(char),1,fpr);
}
if(fpw)
{
fputs(file_name,fplist);
fputs("\n",fplist);
fclose(fpw);
}
fclose(fplist);
fclose(fpr);
printf("文件切割完成\n");
return 0;
}
文件合并
int FileMerge(){
FILE *fpr;
FILE *fpw;
FILE *fplist;
char file_name[20],filename[20];
int file_id,i;
char data;
unsigned int size_r;
char name[20];
printf("请输入要合成的文件(格式ceshi.txt):\n");
scanf("%s",filename);
/*创建要写人文件*/
fpw = fopen(filename,"wb");
if(!fpw)
{
printf("文件创建失败！\n");
return 0;
}
fplist = fopen("./data/filelist.txt","r");
//fgets(file_name,20,fplist);
while(fgets(file_name,20,fplist) != NULL)
{
file_name[strlen(file_name)-1]='\0';
fpr = fopen(file_name,"rb");
if(!fpr)
{
printf("打开文件%s失败\n",file_name);
return 0;
}
size_r = fread(&data,sizeof(char),1,fpr);
while(size_r>0)
{
fwrite(&data,sizeof(char),1,fpw);
size_r = fread(&data,sizeof(char),1,fpr);
}
fclose(fpr);
//fgets(file_name,20,fplist);
}
fclose(fpw);
printf("文件合并完成\n");
return 0;
}
使用命令传参版
int FileCutting(char *file_name,long n){
FILE *fpr; /*读文件指针*/
FILE *fpw; /*写文件指针*/
FILE *fplist; /**/
//char file_name[20];
int file_id; /*新文件名id，001,002*/
long offset; /*文件指针位置*/
long fsize; /*文件大小*/
long fblock = 0; /* 1 M */
char data;
unsigned int size_r;
//printf("请输入文件名\n");
//scanf("%s",file_name);
//printf("请输入切割大小(输入50则拆分50K一份)\n");
//scanf("%d",&n);
//printf("%s",NameSqlit(file_name));
if(NameSqlit(file_name) == 0 || n == 0){
printf("输入有误，程序退出\n");
return 0;
}
fblock = 1024 * n;
fpr = fopen(file_name,"rb");
if(!fpr)
{
printf("文件打开失败！\n");
return 0;
}
offset = 0;
fseek(fpr,0,SEEK_END);
fsize = ftell(fpr);
fseek(fpr,0,SEEK_SET); /*返回文件头*/
size_r = fread(&data,sizeof(char),1,fpr);
file_id = 1;
sprintf(file_name,"%s.%03d",NameSqlit(file_name),file_id); /* demo.001 */
fpw = fopen(file_name,"wb"); /*创建新文件*/
fplist = fopen("./data/filelist.txt","w");
while(size_r>0)
{
/*写入新的文件*/
fwrite(&data,sizeof(char),1,fpw);
offset = ftell(fpr);
if(offset % fblock == 0)
{
/*结束当前文件，建立新文件*/
fclose(fpw);
fputs(file_name,fplist);
fputs("\n",fplist);
file_id++;
sprintf(file_name,"%s.%03d",NameSqlit(file_name),file_id); /* demo.00x */
fpw = fopen(file_name,"wb"); /*创建新文件*/
}
size_r = fread(&data,sizeof(char),1,fpr);
}
if(fpw)
{
fputs(file_name,fplist);
fputs("\n",fplist);
fclose(fpw);
}
fclose(fplist);
fclose(fpr);
printf("文件切割完成\n");
return 0;
}
int FileMerge(char *filename){
FILE *fpr;
FILE *fpw;
FILE *fplist;
char file_name[20];
//char filename[20];
int file_id,i;
char data;
unsigned int size_r;
char name[20];
fpw = fopen(filename,"wb");
if(!fpw)
{
printf("文件创建失败！\n");
return 0;
}
fplist = fopen("./data/filelist.txt","r");
while(fgets(file_name,20,fplist) != NULL)
{
file_name[strlen(file_name)-1]='\0';
fpr = fopen(file_name,"rb");
if(!fpr)
{
printf("打开文件%s失败\n",file_name);
return 0;
}
size_r = fread(&data,sizeof(char),1,fpr);
while(size_r>0)
{
fwrite(&data,sizeof(char),1,fpw);
size_r = fread(&data,sizeof(char),1,fpr);
}
fclose(fpr);
}
fclose(fpw);
printf("文件合并完成\n");
return 0;
}
void DispalyMenu(){
printf("请输入正确的命令格式如下：\n");
printf("main.exe -t s 分割文件 单个文件大小\n");
printf("main.exe -t m 合并后的文件名称\n");
return;
}
int main(int argc,char* argv[])
{
if(strcmp("s",argv[2]) == 0){
if(argc < 5){
DispalyMenu();
return 0;
}
printf("正在切割文件请稍后...\n");
FileCutting(argv[3],strtol(argv[4],NULL,10));
}else if(strcmp("m",argv[2]) == 0){
if(argc < 4){
DispalyMenu();
return 0;
}
printf("正在合并文件请稍后...\n");
FileMerge(argv[3]);
}else{
DispalyMenu();
return 0;
}
}
效果图
