C++中CopyFile和MoveFile函数使用区别的示例分析

#include <fstream>
#include <windows.h>
 
int main()
{
 char *fn = "test.txt";
 
 std::ofstream out(fn);
 if (!out.is_open())
  return 0;
 out.close();
 
 WCHAR buf[256];
 memset(buf, 0, sizeof(buf));
 MultiByteToWideChar(CP_ACP, 0, fn, strlen(fn) + 1, buf, sizeof(buf) / sizeof(buf[0]));
 CopyFile(buf, L"../file/output.txt", FALSE);//FALSE:如果目标位置已经存在同名文件，就覆盖，return 1
            //TRUE:如果目标位置已经存在同名文件，则补拷贝，return 0
            //后者路径若不错在，return 0
 system("pause");
 return 1;
}

#include <fstream>
#include <windows.h>
 
int main()
{
 char *fn = "test.txt";
 
 std::ofstream out(fn);
 if (!out.is_open())
  return 0;
 out.close();
 
 WCHAR buf[256];
 memset(buf, 0, sizeof(buf));
 MultiByteToWideChar(CP_ACP, 0, fn, strlen(fn) + 1, buf, sizeof(buf) / sizeof(buf[0]));
 MoveFile(buf, L"../file/output.txt");//FALSE:将前者移动到后者中(后者路径若不错在，return 0)
 
 system("pause");
 return 1;
}

#include <WINDOWS.H>
 
int main()
{
 char *sourcefile = "d://source//p.png";//源文件
 char *targetfile = "d://target//q.png";//目标文件
 CopyFile(sourcefile , targetfile , FALSE);//false代表覆盖，true不覆盖
 return 0;
}

//MyCopyFile.cpp#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>
#include "io.h"
#include <fstream>
#include <WINDOWS.H>

//define the buffer size. Do not change the size!
#define DETECT_BUFFER_SIZE 0x20000
using namespace std;

//getFiles_Name函数声明，作用：读取path路径下的.png格式文件，并将每个.png文件的路径和文件名分别存储到files和filesname
void getFiles_Name(string path, vector<string>& files, vector<string>& filesname);

int main(void)
{
 vector<string> classnames;
 classnames.push_back(string("disgust"));
 classnames.push_back(string("neutral"));
 classnames.push_back(string("scream"));
 classnames.push_back(string("smile"));
 classnames.push_back(string("squint"));
 classnames.push_back(string("surprise"));

 for (int iexpress = 0; iexpress < 7;iexpress++)
 {
  string inputStr = "C:\\SourceFile\\" + classnames[iexpress];
  string outputStr = "C:\\TargetFile\\" + classnames[iexpress] + "\\";

  vector<string> files;
  vector<string> filesname;
  ////获取该路径下的所有文件 
  getFiles_Name(inputStr, files, filesname);

  //循环复制文件
  for (int k = 0; k < files.size(); k++)
  {
   unsigned char *pBuffer = (unsigned char *)malloc(DETECT_BUFFER_SIZE);
   if (!pBuffer)
   {
    fprintf(stderr, "Can not alloc buffer.\n");
    return -1;
   }

   cout << files[k] << endl;
   CopyFile(files[k].c_str(), (outputStr + filesname[k]).c_str(), FALSE);//false代表覆盖，true不覆盖
 　　　　 //若文件路径为string类型变量，例如为pathstr，则需使用pathstr.c_str()转换即可；
   free(pBuffer);
  }
 }
 return 0;
}

void getFiles_Name(string path, vector<string>& files, vector<string>& filesname)
{
 //文件句柄 
 intptr_t hFile;
 //文件信息，声明一个存储文件信息的结构体 
 struct _finddata_t fileinfo;
 string p;//字符串，存放路径
    //string name;
 if ((hFile = _findfirst(p.assign(path).append("\\*.png").c_str(), &fileinfo)) != -1)//若查找成功，则进入
 {
  do
  {
   files.push_back(path + "\\" + fileinfo.name);
   filesname.push_back(fileinfo.name);
  } while (_findnext(hFile, &fileinfo) == 0);
  //_findclose函数结束查找
  _findclose(hFile);
 }
}