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Pass image from c# to access

Posted on 2011-09-20
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Last Modified: 2012-06-21
I have a c# dll that I use to capture an image (a signature). I want to return that image to my MsAccess program and display in an image/ picture box. I would prefer not to save to c:\.bmp from c# and then open from access.

I want to do something like this in Access end. (not actual code)
Dim x as myC#.dll
dim Img as image
img = x.getimage() (getimage is the c# function)

I can call the functions ok it is the format of the image that is the probem.

Thanks

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Question by:Eamon
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Gustav Brock earned 250 total points
ID: 36567976
I believe the image must be a bitmap, ie. bmp.

/gustav
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by:Nick67
Nick67 earned 250 total points
ID: 36568810
<I would prefer not to save to c:\.bmp from c#>
Does that mean that you don't want to save the image to disk at all?
or
<and then open from access.>
Does that mean that you want Access to just know where the saved file is?

Image controls have a .Picture property and .PictureType property
If the .Picture property was set to say "c:\temp\SomePicture.bmp"
and  .PictureType was set to Linked, the image would update after your c#.dll saved a new picture and you requeried the control.

Is that an acceptable setup?  Or were you looking for something different?
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by:Eamon
ID: 36573847
Thanks Nick.
<I would prefer not to save to c:\.bmp from c#> meant that I knew I could save from c# to file and display in access.
This is what I will do if I can just pass the image.

Do access and c# not share a same type that I can pass between.
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Expert Comment

by:Gustav Brock
ID: 36573907
You could try with a Picture control:

Me!picTest.PictureData = x.getimage()

But .PictureData may be for Access internal use only as some metadata should be included in this as well.

/gustav
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Author Comment

by:Eamon
ID: 36573934
what type of image/object should get image return
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Expert Comment

by:Gustav Brock
ID: 36574057
First choice would be bitmap.
If I recall correctly, PictureData holds a Byte array of the bitmap.

If you load a picture into your Picture control (integrated, not linked), you can save the form to a text file with SaveAsText ... and then study the generated text file for the entry, similar to this:

PictureData = Begin
0x2800000010000000100000000100040000000000800000000000000000000000 ,
0x8080000080808000c0c0c0000000ff00c0c0c00000ffff00ff000000c0c0c000 ,
0xffff0000ffffff00dadad0dadadadadaadad00adadadadaddad030dadadadada ,
0xad0330adadadadad0033300000000adaa03330ff0dadadadd03300ff0adad4da ,
0xa03330ff0dad44add03330ff0ad44444a03330ff0d444444d03330ff0ad44444 ,
0xa0330fff0dad44add030ffff0adad4daa00fffff0dadadadd00000000adadada ,
0xadadadadadadadad000000000000000000000000000000000000000000000000x0000000000000000
End

/gustav
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by:Gustav Brock
ID: 36598532
Fine, but what/how did you do, please?
Could you perhaps also provide a snip of your C# code setting the format?

/gustav
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by:Eamon
ID: 36598674
as you stated I just went with the bmp file. saved it to c:\ and displayed in access.
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