文件分割工具

#include<iostream>#include<iomanip>#include<fstream>#include<string>using namespace std;int main(){string path;cout<<"请输入要分隔的文件路径：";cin>>path;string block;cout<<"请输入每块的文件大小(1G/1M/1K/1B)：";cin>>block;const int block_size=33554432;unsigned __int64 size;int ubound=block.size()-1;sscanf(block.substr(0,ubound).c_str(),"%I64d",&size);switch(block[ubound]){case 'G':{size <<=30;break;}case 'M':{size <<=20;break;}case 'K':{size <<=10;break;}default:{break;}}ifstream in(path.c_str(),ios::binary);if(!in){cout<<"打开文件失败，请重新运行！"<<endl;return -1;}int count=0;double sum=0;char *buf=new char[block_size];ofstream out((path+".bat").c_str());out<<"@echo off"<<endl;out<<"echo -----------------------------------------------------"<<endl;out<<"echo -               欢迎使用文件分割工具                -"<<endl;out<<"echo -                                                   -"<<endl;out<<"echo -                                                   -"<<endl;out<<"echo -----------------------------------------------------"<<endl;for(int i=1;i>0;i++,count++){itoa(i,buf,10);string fullname=path+".part"+buf;cout<<"正在生成"<<fullname<<endl;ofstream fout(fullname.c_str(),ios::binary | ios::trunc);unsigned __int64 current_size=size;while(current_size>0){if(current_size>=block_size){in.read(buf,block_size);}else{in.read(buf,current_size);}if(in.gcount()==0){i=-1;break;}current_size -=in.gcount();sum +=in.gcount();fout.write(buf,in.gcount());}fout.close();}out<<"echo 本批处理文件共分成 "<<count<<" 个子文件，共 ";if(sum>=1000000000){out<<fixed<<setprecision(2)<<sum/1073741824<<" G";}else if(sum>=1000000){out<<fixed<<setprecision(2)<<sum/1048576<<" M";}else if(sum>=1000){out<<fixed<<setprecision(2)<<sum/1024<<" K";}else{out<<sum<<" B";}out<<endl;out<<"echo 请确认: 1、子文件的个数是否相符并放在当前目录下"<<endl;out<<"echo         2、可用剩余空间是否足够"<<endl;out<<"pause"<<endl;out<<"echo 开始合并文件,合并过程中请勿关闭，合并时间长短与文件的大小有关"<<endl;out<<"echo 合并结束后会自动关闭当前窗口"<<endl;out<<"echo 请稍后... "<<endl;out<<"copy /b ";int pos=path.find_last_of('\\');string filename=path.substr(pos+1);for(i=0;i<count;i++){out<<filename<<".part"<<i+1;if(i<count-1){out<<'+';}}out<<' '<<filename<<endl;out.close();delete [] buf;in.close();cout<<"文件分割成功！"<<endl;system("pause");return 0;}