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problem with writefile when Heap is more than 1 megabyte
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jklosak  
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 More options Dec 9 2010, 10:53 pm
Newsgroups: microsoft.public.masm
From: jklosak <jklo...@gmail.com>
Date: Thu, 9 Dec 2010 19:53:54 -0800 (PST)
Local: Thurs, Dec 9 2010 10:53 pm
Subject: problem with writefile when Heap is more than 1 megabyte
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masm32 on Win7 machine
trying to save a large Heap to file
invoke HeapCreate,NULL,2000000,0
mov Heap1,eax   ;handle to the heap
invoke HeapAlloc,Heap1,HEAP_ZERO_MEMORY,2000000
 invoke FileAccess,0,0,0,ADDR CPTChargeFile,GRGW,SHARE,NORMAL
 invoke SetFilePointer,tmphandle,NULL,NULL,FILE_BEGIN
invoke WriteFile,tmphandle,lpHeap,M2,ADDR byteswritten,NULL
        invoke GetLastError

getlasterror returns
1784 The supplied user buffer is not valid for the requested
operation. ERROR_INVALID_USER_BUFFER
works fine if the Heap is under 1 meg. any ideas appreciated.
thanks
john klosak


 
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