备份文件夹

用到的API和数据结构：

WINDOWS数据结构：

WIN32_FIND_DATA

WINDOWS API：

FindFirstFile

FindNextFile

CompareFileTime

CopyFIle

DeleteFile

#include <windows.h>
#include <iostream>
#include <string>
using namespace std;
#define MAXN 10000
typedef struct _SRCFILE
{
   WIN32_FIND_DATA fd;//我WIN32_FIND_DATA关于文件的全部属性信息的数据结构
   bool IsNew;
}SRCFILE;

SRCFILE srcFiles[MAXN], desFiles[MAXN];

WIN32_FIND_DATA fd;
int iSrcFiles;
int iDesFiles;

void get_source(string str)
{
   bool bRet = true;
   iSrcFiles = 0;
   HANDLE hFile = FindFirstFile(str.c_str(),&fd);
   while( hFile != INVALID_HANDLE_VALUE && bRet )
   {
      if( fd.dwFileAttributes == FILE_ATTRIBUTE_ARCHIVE )
      {
          srcFiles[iSrcFiles].fd = fd;
          srcFiles[iSrcFiles].IsNew = false;
          iSrcFiles++;
      }
      bRet = FindNextFile(hFile, &fd);

   }
   
}

void get_destion(string str)
{
   bool bRet = true;
   iDesFiles = 0;
   HANDLE hFile = FindFirstFile(str.c_str(),&fd);
   while( hFile != INVALID_HANDLE_VALUE && bRet )
   {
      if( fd.dwFileAttributes == FILE_ATTRIBUTE_ARCHIVE )
      {
          desFiles[iDesFiles].fd = fd;
          desFiles[iDesFiles].IsNew = false;
          iDesFiles++;
      }
      bRet = FindNextFile(hFile, &fd);

   }
}

void solve(string sp, string st)
{
   int i ,j;
 //  printf("iSrcFiles = %d iDesFiles = %d\n", iSrcFiles, iDesFiles);
   for(i = 0; i < iSrcFiles; i++)
   {   
       int f = 0;
       for(j = 0; j < iDesFiles; j++)
       {
            if( strcmp(srcFiles[i].fd.cFileName,desFiles[j].fd.cFileName) == 0 && CompareFileTime(&srcFiles[i].fd.ftLastWriteTime, &desFiles[j].fd.ftLastWriteTime) == 0 )
            {
                f = 1;
                break;
            }

       }
       if( !f )
           srcFiles[i].IsNew = true;
       else
           desFiles[i].IsNew = true;
   }
   for( i = 0; i < iSrcFiles; i++)
   {
       if( srcFiles[i].IsNew )
       {
         string spath = sp + srcFiles[i].fd.cFileName;
         string dpath = st + srcFiles[i].fd.cFileName;
         printf("备份的是：%s\n", spath.c_str());
         CopyFile(spath.c_str(),dpath.c_str(),false);//备份也要指定路径+文件名
       }
   }
   for(i = 0; i < iDesFiles; i++)
   {
      if( desFiles[i].IsNew == false )
      {
         string dpath = st + desFiles[i].fd.cFileName; //cFileName只包含文件名，删除要指定路径
         printf("删除的是：%s\n",dpath.c_str());
         DeleteFile(dpath.c_str());
      }

   }
   
}

int main( )
{
    string str("E:\\桂林\\*.*"); //查询这个文件夹下的所有文件
    string st("D:\\桂林\\*.*");    
    get_source(str);
    get_destion(st);
    string sq("E:\\桂林\\");
    string sp("D:\\桂林\\");
    solve(sq,sp);
    return 0;

}