/// <summary>
/// 创建文件映射对象，并映射(内存)视图。
/// </summary>
/// <param name="mappingName">文件映射对象的名称，可为null/empty。</param>
/// <param name="pageAccessRights">内存页面访问权限。</param>
/// <param name="mappingAccessRights">文件映射的访问权限。</param>
/// <param name="mappingOffset">文件映射的偏移量(起始位置)。</param>
/// <param name="viewSize">文件映射的视图大小，单位：字节。</param>
protected void InternalCreate(string mappingName, WIN32_API.PageAccess pageAccessRights,
WIN32_API.FileMappingAccess mappingAccessRights, ulong mappingOffset, uint viewSize)
{
SafeFileMappingHandle handle = null;
SafeViewOfFileHandle view = null;
handle = CreateMapping(mappingName, pageAccessRights, mappingAccessRights, mappingOffset, ref viewSize);
view = WIN32_API.MapViewOfFile(handle,
mappingAccessRights,
(uint)(mappingOffset >> 32),
(uint)mappingOffset,
viewSize);
if (view.IsInvalid)
{
handle.Dispose();
handle = null;
throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
}
m_mappingName = mappingName;
m_mappingHandle = handle;
m_mappingView = view;
m_mappingOffset = mappingOffset;
m_viewSize = viewSize;
}
/// <summary>
/// 初始化SharedMemory类的新实例。
/// </summary>
public SharedMemory()
{
m_mappingName = null;
m_mappingHandle = null;
m_mappingView = null;
m_mappingOffset = 0;
m_viewSize = 0;
}
/// <summary>
/// 释放SharedMemory所使用的资源。
/// </summary>
/// <param name="disposing">资源释放标志，True: 释放所有资源；False: 仅释放非受控资源。</param>
protected virtual void Dispose(bool disposing)
{
if (m_mappingView != null && !m_mappingView.IsInvalid)
{
m_mappingView.Dispose();
m_mappingView = null;
}
if (m_mappingHandle != null && !m_mappingHandle.IsInvalid)
{
m_mappingHandle.Dispose();
m_mappingHandle = null;
}
m_mappingOffset = 0;
m_viewSize = 0;
m_mappingName = null;
}
