Save image to file from memory

**Cor Ligthert[MVP]** · Jun 27 '08, 08:14 PM

Re: Save image to file from memory

Jerry,

For sure you can use in VB Image.Save, there are no Net classes wich are not
supported in VB for Net

Cor

"Jerry Spence1" <jerry.spence@s omewhere.co.uks chreef in bericht
news:NP6dnYOgTb uOmL7VnZ2dnUVZ8 q6onZ2d@plusnet ...

>I am using a network camera that saves the image in a byte array in memory
>(via their ocx component, and in the OnNewImage event I can get the pointer
>to the image and the byte length as
e.lFrmBytes
>
e.lPtrToImage
>
How do I get at that array in memory and save it to disk? It seems to
suggest a pointer which is not supported in VB.
>
-Jerry
>
>
>

**kimiraikkonen** · Jun 27 '08, 08:14 PM

Re: Save image to file from memory

On May 8, 4:50 pm, "Jerry Spence1" <jerry.spe...@s omewhere.co.uk>
wrote:

I am using a network camera that saves the image in a byte array in memory
(via their ocx component, and in the OnNewImage event I can get the pointer
to the image and the byte length as
e.lFrmBytes
>
e.lPtrToImage
>
How do I get at that array in memory and save it to disk? It seems to
suggest a pointer which is not supported in VB.
>
-Jerry

Hi Jerry,
If you're able to copy image to clipboard (memory), you can simply
retrieve it into a picturebox and save by using save method. First
make sure image is copied to clipboard.

' To get image from clipboard
PictureBox1.Ima ge = Clipboard.GetIm age

' Then save image with a proper path
PictureBox1.Ima ge.Save("image_ path.jpg")

Hope this helps,

Onur

**Jerry Spence1** · Jun 27 '08, 08:14 PM

Re: Save image to file from memory

Thanks. My problem is how to get at the memory in the first place. Given the
pointer, how do I read it?

-Jerry

"kimiraikko nen" <kimiraikkonen8 5@gmail.comwrot e in message
news:96a98ce9-747d-4d07-ad83-a4d943c36856@m7 3g2000hsh.googl egroups.com...

On May 8, 4:50 pm, "Jerry Spence1" <jerry.spe...@s omewhere.co.uk>
wrote:

>I am using a network camera that saves the image in a byte array in
>memory
>(via their ocx component, and in the OnNewImage event I can get the
>pointer
>to the image and the byte length as
>e.lFrmBytes
>>
>e.lPtrToImag e
>>
>How do I get at that array in memory and save it to disk? It seems to
>suggest a pointer which is not supported in VB.
>>
>-Jerry

>
Hi Jerry,
If you're able to copy image to clipboard (memory), you can simply
retrieve it into a picturebox and save by using save method. First
make sure image is copied to clipboard.
>
' To get image from clipboard
PictureBox1.Ima ge = Clipboard.GetIm age
>
' Then save image with a proper path
PictureBox1.Ima ge.Save("image_ path.jpg")
>
Hope this helps,
>
Onur

**=?Utf-8?B?U3VydHVyWg==?=** · Jun 27 '08, 08:14 PM

Re: Save image to file from memory

I think you'll need to use Windows API calls.

Maybe RtlMoveMemory?

I wouldn't be surprised if VB.NET tries to frustrate you, though. VB.NET
programmers aren't really meant to access memory directly.

--
David Streeter
Synchrotech Software
Sydney Australia

"Jerry Spence1" wrote:

Thanks. My problem is how to get at the memory in the first place. Given the
pointer, how do I read it?
>
-Jerry
>
>
"kimiraikko nen" <kimiraikkonen8 5@gmail.comwrot e in message
news:96a98ce9-747d-4d07-ad83-a4d943c36856@m7 3g2000hsh.googl egroups.com...

On May 8, 4:50 pm, "Jerry Spence1" <jerry.spe...@s omewhere.co.uk>
wrote:

I am using a network camera that saves the image in a byte array in
memory
(via their ocx component, and in the OnNewImage event I can get the
pointer
to the image and the byte length as
e.lFrmBytes
>
e.lPtrToImage
>
How do I get at that array in memory and save it to disk? It seems to
suggest a pointer which is not supported in VB.
>
-Jerry

Hi Jerry,
If you're able to copy image to clipboard (memory), you can simply
retrieve it into a picturebox and save by using save method. First
make sure image is copied to clipboard.

' To get image from clipboard
PictureBox1.Ima ge = Clipboard.GetIm age

' Then save image with a proper path
PictureBox1.Ima ge.Save("image_ path.jpg")

Hope this helps,

Onur

>
>
>

**=?Utf-8?B?U3VydHVyWg==?=** · Jun 27 '08, 08:14 PM

Re: Save image to file from memory

The namespace Microsoft.Win32 .SafeHandles Namespace might also yield a clue.
I don't know anything about this namespace, but it looks promising.

--
David Streeter
Synchrotech Software
Sydney Australia

"SurturZ" wrote:

I think you'll need to use Windows API calls.
>
Maybe RtlMoveMemory?
>
I wouldn't be surprised if VB.NET tries to frustrate you, though. VB.NET
programmers aren't really meant to access memory directly.
>
>
>
--
David Streeter
Synchrotech Software
Sydney Australia
>
>
"Jerry Spence1" wrote:
>

Thanks. My problem is how to get at the memory in the first place. Given the
pointer, how do I read it?

-Jerry

"kimiraikko nen" <kimiraikkonen8 5@gmail.comwrot e in message
news:96a98ce9-747d-4d07-ad83-a4d943c36856@m7 3g2000hsh.googl egroups.com...

On May 8, 4:50 pm, "Jerry Spence1" <jerry.spe...@s omewhere.co.uk>
wrote:
>I am using a network camera that saves the image in a byte array in
>memory
>(via their ocx component, and in the OnNewImage event I can get the
>pointer
>to the image and the byte length as
>e.lFrmBytes
>>
>e.lPtrToImag e
>>
>How do I get at that array in memory and save it to disk? It seems to
>suggest a pointer which is not supported in VB.
>>
>-Jerry
>
Hi Jerry,
If you're able to copy image to clipboard (memory), you can simply
retrieve it into a picturebox and save by using save method. First
make sure image is copied to clipboard.
>
' To get image from clipboard
PictureBox1.Ima ge = Clipboard.GetIm age
>
' Then save image with a proper path
PictureBox1.Ima ge.Save("image_ path.jpg")
>
Hope this helps,
>
Onur

**Joel Lucsy** · Jun 27 '08, 08:14 PM

Re: Save image to file from memory

Try the System.Runtime. InteropServices .Marshal namespace.

--
Joel Lucsy
"The dinosaurs became extinct because they didn't have a space program."
-- Larry Niven

Save image to file from memory

Save image to file from memory

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