下面是内存映射的代码：
也很简单：
首先先通过VirtualAlloc函数申请一块32位虚拟内存区域
然后通过 MapUserPhysicalPages API 函数将AWE内存映射到这个虚拟内存地址区域。
|
以下为引用的内容：
public void Map(bool readOnly)
{
unsafe
{
if (IsMapped)
{
return;
}
if (readOnly)
{
_VirtualAddress = AweApi.VirtualAlloc(null, Capacity, AweApi.MEM_RESERVE | AweApi.MEM_PHYSICAL,
AweApi.PAGE_READONLY);
}
else
{
_VirtualAddress = AweApi.VirtualAlloc(null, Capacity, AweApi.MEM_RESERVE | AweApi.MEM_PHYSICAL,
AweApi.PAGE_READWRITE);
}
if (_VirtualAddress == null)
{
throw new AweStreamException("Cannot reserve memory.", AweStreamException.Reason.CannotReserveMemory);
}
if (!AweApi.MapUserPhysicalPages(_VirtualAddress, _NumberOfPages, _PFNArray))
{
AweApi.VirtualFree(_VirtualAddress, Capacity, AweApi.MEM_RELEASE);
_VirtualAddress = null;
throw new AweStreamException(string.Format("MapUserPhysicalPages failed ({0})", General.GetLastError()),
AweStreamException.Reason.MapUserPhysicalPagesFail);
}
_CanWrite = !readOnly;
}
} |
去映射和归还AWE内存的过程是上面两个过程的逆过程，这里就不再多讲。
