SharedMemory.cpp

[詳解]

// ----------------------------------------------------------------------------
 
#include "pch.h"
#include "SharedMemory.h"
 
using namespace alt;
 
SharedMemory::SharedMemory ()
    :HandleLibrary ()
{
    _lpvMapped = NULL;
}
 
SharedMemory::~SharedMemory ()
{
    if (_lpvMapped != NULL)
    {
        this->Unmapped ();
    }
}
 
BOOL SharedMemory::Create (LPCTSTR lpctszName, DWORD dwSize)
{
    _hObject = ::CreateFileMapping (
        INVALID_HANDLE_VALUE,
        NULL,
        PAGE_READWRITE,
        0,
        dwSize,
        lpctszName);
 
    return _hObject == NULL ? FALSE : TRUE;
}
 
BOOL SharedMemory::Open (LPCTSTR lpctszName)
{
    _hObject = ::OpenFileMapping (
        FILE_MAP_ALL_ACCESS,
        FALSE,
        lpctszName);
 
    return _hObject == NULL ? FALSE : TRUE;
}
 
LPVOID SharedMemory::Mapped ()
{
    _lpvMapped = ::MapViewOfFile (
        _hObject,
        FILE_MAP_ALL_ACCESS,
        0,
        0,
        0);
 
    return _lpvMapped;
}
 
BOOL SharedMemory::Unmapped ()
{
    BOOL ret = ::UnmapViewOfFile (_lpvMapped);
    if (ret) _lpvMapped = NULL;
 
    return ret;
}