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#include<io.h>   //CÓïÑÔÍ·Îļþ
#include<iostream>   //for system();
using namespace std;
int main()
{
  int handle;
  handle = open("test.txt", 0x0100); //open file for read
  long length = filelength(handle); //get length of file
  cout<<"file length in bytes:"<<length<<endl;
  close(handle);
 
  system("pause");
  return 0;
}
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//¼ÙÉèÎļþfile.txt ÔÚµ±Ç°Ä¿Â¼ÏÂ
//file.txtµÄÄÚÈÝΪ:123abc
//¹ØÓÚwindows APIº¯ÊýÇé²Î¿¼²¿·Öwindows APIº¯Êý»òMSDN
#include <iostream>
#include <windows.h>   //for windows api
using namespace std;
int main()
{
  //ÓÃAPIº¯ÊýCreateFile()´´½¨Îļþ¾ä±ú
  HANDLE fhadle = CreateFile("file.txt",           //ÎļþÃû»ò·¾¶
                                  0,
                                  0,
                                  0,
                                  OPEN_EXISTING, //Îļþ´æÔÚÔò´ò¿ª²¢¶ÁÈ¡
                              


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