Лабораторная работа №6 / 6 / lab6

#include "stdafx.h"


using namespace std;

void create();
void map();
void unmap();

char Filename1[_MAX_FNAME];
HANDLE hFile, hMapFile;
LPVOID lpMapAddress;
int a;


int _tmain(int argc, _TCHAR* argv[])
{
 system("cls");
 cout<<"\n                                The sixth laboratory work "<<endl;
 cout<<"                                       File mapping"<<endl;
 getch();
 do
  { 
   system("cls");
   cout<<"\n                                     Menu\n"<<endl;
   cout<<" 1.Creating a file mapping object for the specified file"<<endl;
   cout<<" 2.Mapping a view of a file into the address space of the calling process"<<endl;
   cout<<" 3.Unmapping a mapped view of a file from the calling process's address space"<<endl;
   cout<<" 4.Exit"<<endl;
   do
	{
	 cout<<"\n   Vibirite punkt menu:"<<endl;
     cin>>a;
     if(a<0||a>4)
      {
	   cout<<"\n   Vi dopustili oshibku!!!(1-4)"<<endl;
	   getch();
	  }
	}
   while(a<0||a>4);
   switch(a)
    {
	 case 1:
	  {
	   create();
	   break;
	  }
	 case 2:
	  {
	   map();
	   break;
	  }
     case 3:
	  {
	   unmap();
	   break;
	  }
	}
  }
 while(a!=4);
 return 0;
}

 void create()
  {  
   system("cls");
   cout<<"\nEnter the name of the file: \n"<<endl;
   cin>>Filename1;
   if(hFile = CreateFile(Filename1,GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0)) 
    { 
     if (hFile == INVALID_HANDLE_VALUE) 
      { 
       cout<<"\nError!!!(maybe such file has already exists)"<<endl;
       getch();
      }
     else
      {
       cout<<"File "<<Filename1<<" successfully opened!"<<endl;
       getch();
  	  }
    }
   else
    {
     cout<<"\nError!!!"<<endl;  
     getch();
    }
   hMapFile = CreateFileMapping(hFile,NULL,PAGE_WRITECOPY,0,0,"MyFileMappingObject");        
   if (hMapFile != NULL && GetLastError() == ERROR_ALREADY_EXISTS) 
    { 
     CloseHandle(hMapFile); 
     hMapFile = NULL; 
	 cout<<"Already exists"<<endl;
	 getch();
    } 
   if (hMapFile == NULL) 
    { 
     cout<<"Could not create file mapping object"<<endl; 
	 cout<<"Error #"<<GetLastError()<<endl;
	 getch();
    }
   else
    {
	 cout<<"File mapping object successfully created"<<endl; 
	 getch();
	}
  }

 void map(void)
  {
   system("cls");
   lpMapAddress = MapViewOfFile(hMapFile,FILE_MAP_COPY,0,0,0);                                
    if (lpMapAddress == NULL) 
     { 
      cout<<"Could not map view of file"<<endl; 
	  getch();
     }
    else
     {
	  cout<<"View of file was successfully  mapped"<<endl; 
	  getch();
     }
   }
 
 void unmap(void)
  {
   system("cls");
   if(UnmapViewOfFile(lpMapAddress))                            
    { 
     cout<<"A mapped view of a file was successfully unmapped "<<endl; 
	 getch();
    }
   else
    {
	 cout<<"Error!!!"<<endl; 
	 getch();
    }
   CloseHandle(hMapFile);
   CloseHandle(hFile); 
  }