Saving an array to File

LeCaravage · 13 February 2021, 18:37

Hi,

I use BlitzBasic 2 on Amiga 500 KS1.3

I'd like to save an array rawb.B(x) to a file. Straight bytes from rawb(x) to file.
I use to have the code but lost it and can't find it anywhere on web. So I seak for your help.
Thanks

Samurai_Crow · 14 February 2021, 03:09

In DOS.library there's a call called Write() that will do it but I don't know the Blitz BASIC handle to it.

Coagulus · 14 February 2021, 15:29

On Wormy I created a bank using InitBank and then Poked the values into it. Then used SaveBank to save it. Loading was the same but in reverse using Peek.

There may be a better way but that worked.

Daedalus · 14 February 2021, 15:46

Yep, savebank and loadbank will work fine, but if you already have the memory you want to save, you can save and load any memory range with WriteMem and ReadMem. Knowing the size of an array, you can save the entire block and read it back to the variables if you wished. It's not foolproof so you'd want to make absolutely sure you're giving it valid values, but it's quite straightforward.

The address of the start of an array is obtained using &arrayname(0), and the size is (number of elements + 1) * element size. If you're dealing in bytes, each element is 1 byte so an array set up with Dim arrayname(50) is size 51. Then, WriteMem(myFile, &arrayname(0), 51) should do the trick to save it to a file you're opened, and ReadMem will load it back in. Make sure you have the array set up before you load anything into it this way!

LeCaravage · 14 February 2021, 16:37

@all : Thanks for your help mates.

I thought using Allocmem, copy array to allocmem's adress and then Writemem.
But your bank method suits me better because faster and easier.

13 February 2021, 18:37	#1
LeCaravage Registered User Join Date: May 2017 Location: AmigaLand Posts: 459	Saving an array to File Hi, I use BlitzBasic 2 on Amiga 500 KS1.3 I'd like to save an array rawb.B(x) to a file. Straight bytes from rawb(x) to file. I use to have the code but lost it and can't find it anywhere on web. So I seak for your help. Thanks

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14 February 2021, 03:09	#2
Samurai_Crow Total Chaos forever! Join Date: Aug 2007 Location: Waterville, MN, USA Age: 49 Posts: 2,186	In DOS.library there's a call called Write() that will do it but I don't know the Blitz BASIC handle to it.

14 February 2021, 15:29	#3
Coagulus Gets there in the end... Join Date: Sep 2005 Location: Wales Posts: 862	On Wormy I created a bank using InitBank and then Poked the values into it. Then used SaveBank to save it. Loading was the same but in reverse using Peek. There may be a better way but that worked.

14 February 2021, 15:46	#4
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Yep, savebank and loadbank will work fine, but if you already have the memory you want to save, you can save and load any memory range with WriteMem and ReadMem. Knowing the size of an array, you can save the entire block and read it back to the variables if you wished. It's not foolproof so you'd want to make absolutely sure you're giving it valid values, but it's quite straightforward. The address of the start of an array is obtained using &arrayname(0), and the size is (number of elements + 1) * element size. If you're dealing in bytes, each element is 1 byte so an array set up with Dim arrayname(50) is size 51. Then, WriteMem(myFile, &arrayname(0), 51) should do the trick to save it to a file you're opened, and ReadMem will load it back in. Make sure you have the array set up before you load anything into it this way!

14 February 2021, 16:37	#5
LeCaravage Registered User Join Date: May 2017 Location: AmigaLand Posts: 459	@all : Thanks for your help mates. I thought using Allocmem, copy array to allocmem's adress and then Writemem. But your bank method suits me better because faster and easier.

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