Memory Mapped Files

[comaboy]

Hi all,

I'm trying to understand MMF's - My idea is a batch process that builds a file in memory and then flushes the lot to disk on completion.

Now I'm new to MMF's so I'm probably missing something (like THE POINT! )

Could someone try to explain what I'm doing wrong in the Psuedo below...

[psuedo]
sFile = "C:\whatever.txt"
FileHandle = CreateFile(sFile...
Call WriteFile(FileHandle,... 'write a few bytes
Call FlushFileBuffers(FileHandle) 'flush the bytes to disk
MappingHandle = CreateFileMapping(FileHandle, Security, PAGE_READWRITE, 0, 0, sFile & "map")
MappingAddress = MapViewOfFile(MappingHandle,...
Do
ProcessSomething
Call WriteFile(MappingHandle,...'Fails (BytesWrittten=0)
Loop Until Whatever
' Flush the lot at once
FlushViewOfFile MappingHandle, 0
Call FlushFileBuffers(MappingHandle)
Call FlushFileBuffers(FileHandle)
[/psuedo]

TIA !

 

[HyperEngineer]

Cowboy

CreateFileMapping() sFile & "map" because sFile contains "\". You need to put a name in here that does not contain "\". Such as, "WhateverMap

 

[comaboy]

Thanks for tip, Hyper. I'm currently working on another project, but when I get back to this, I'll let you know how I get on.