Help! Writin an image file from memory to hard drive

[bminghelli]

I am trying to create a function that will save an image to a file. I am
getting the image from a third party device. The ActiveX control that
communicates with the device has a couple of properties that I should be
able to use to write the image file: ImageData which is a pointer to where
the image is stored in ram; and ImageSize. But, I do not know how to use
these to save the image to a file. It seems like there should be some kind
of a function to do this, but I have not been able to find it. Any help?
Thanks,
Blake

[PaulLewis]

You need to ask them what the imageData points to. Is it a bitmap or a a DIB or is it a jpeg or something else?

Once you know this, you will still have to research how to access it, but at least someone can help you with that. Whithout the extra info, it's impossible to know what imagedata represents I think.

Also, what is imagesize? The number of bytes used to render the image? It is meaningless unless they provide you with the data structures as well...

Cheers
Paul Lewis

[ysa1441]

you can try this, i am not sure that it will work though...

'in a module
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
'and then...
Function SaveFile()
Dim Target As Byte
CopyMemory Target,Control.ImageData,hereiamnotsurewhattoputtrysomethingwithLencausehereneedstobethelengthoftheimageintheram

Open "C:\Image.BMP" For Output As #1
Print #1,Target
End if

End Function

or u could forget about the CopyMemory.... part and just put this:

Open "C:\Image.BMP" For Output As #1
Print #1,Contorl.Imagedata
End if

[Edited by ysa1441 on 07-26-2000 at 05:40 PM]