关于CreateFileMapping的问题

初始
hFile   =   CreateFile
hMem   =   CreateFileMapping   (要设定初始大小)
pMem   =   MapViewOfFile

以后若要增长时,
先
UnampViewOfFile(pMem)
CloseHandle(hMem)
再重新
CreateFileMapping
MapViewOfFile

最后保存时
UnampViewOfFile(pMem)
CloseHandle(hMem)
SetFilePointer(hFile,...)
SendEndOfFile(hFile)
CloseHandle(hFile)