CopyMemory, MoveMemory, ZeroMemory
lazarus / 43-Android

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roeug · 2012-10-22 10:55

How make CopyMemory, MoveMemory, ZeroMemory available in porting from
Win?

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Leledumbo · 2012-10-22 11:18

Use the respective Pascal (platform independent ones):
CopyMemory -> Move(<source>,<dest>,<size>);MoveMemory -> doesn't
really exist, do you really need to?ZeroMemory -> FillByte(<a
variable>,<the variable size>,0);

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Laksen · 2012-10-22 13:20

Quote from: Leledumbo on October 22, 2012, 01:18:29 pmUse the
respective Pascal (platform independent ones):
CopyMemory -> Move(<source>,<dest>,<size>);MoveMemory -> doesn't
really exist, do you really need to?ZeroMemory -> FillByte(<a
variable>,<the variable size>,0);It's the other way around. MoveMemory
is the equivalent of the Pascal Move function. CopyMemory has no
equivalent and is inherently unsafe, and should be replaced with Move

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roeug · 2012-10-24 06:25

Thanks (Could find myself -  was in hurry)

Another question: File routines?

In windows they were
CreateFile
GetFileSize
CreateFileMapping
MapViewOfFile
UnmapViewOfFile
CloseHandle( THandle from CreateFileMapping)
SetFilePointer
+AccessMode

Where can I find analogs in lazarus ?
 TMemoryStream - ok

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Leledumbo · 2012-10-24 12:14

QuoteAnother question: File routines?Classic:
http://www.freepascal.org/docs-html/rtl/system/filefunctions.html
Modern: http://www.freepascal.org/docs-
html/rtl/sysutils/ioroutines.html
OOP: http://www.freepascal.org/docs-html/rtl/classes/tfilestream.html

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Laksen · 2012-10-24 13:25

File mapping is very platform specific. On windows you have
MapViewOfFile, while on a POSIX system you can use mmap.

I don't know if anyone has made a crossplatform unit for that, but it
should be possible. Otherwise you can fall back on streams