Custom Capabilities in TWAIN

[edlemus]

Hi,

I'm working with some Canon DR scanners and want to be able to use some features like "auto size detection" and "skip blank pages".
These features are available thorugh TWAIN as of 2.0, but unfortunately the Canon drivers are currently compatible with 1.9 only.
I've found that these settings can be managed directly for those scanners using some custom capabilities (ex.: say 0x8000 for autodetection); but GdPicture only seems to let me manipulate the capabilities that are already defined in the TwainCabalities enumeration.
Is there anyway I can set these custom values? Thanks in advance.

Edson

[edlemus]

Nothing on this?

[Loïc]

Hi,

GdPicture only seems to let me manipulate the capabilities that are already defined in the TwainCabalities enumeration

No it's false. You can pass any integer value to the low-level API function.

IE:

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object.TwainSetCapCurrentNumeric(0x8000,TWTY_BOOL,1)

Hope this helps !

Loïc

[edlemus]

Can you provide a more extensive sample? I'm using c# and I can't send integers to TwainSetCapCurrentNumeric, only a TwainCabalities enumeration value. Is there some special way in which I should reference the library?

[Loïc]

Hi,

Just cast the Integer value to TwainCabalities.

In VB.NET it is

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 Ctype(&h8000, GdPicturePro5.TwainCapabilities)

I suppose it should be something like that in C#

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 (GdPicturePro5.TwainCapabilities)0x8000

Loïc

[Loïc]

Tried:

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     private void button1_Click(object sender, EventArgs e)
      {
         GdPicturePro5.cImaging oImaging = new GdPicturePro5.cImaging();
         oImaging.TwainSetCapCurrentNumeric((GdPicturePro5.TwainCapabilities)0x8000, GdPicturePro5.TwainItemTypes.TWTY_BOOL, 1);
      }

Seems work...

[edlemus]

Never thought that cast would even work as the values are not predefined, but it does!
Sorry I didn't even tried before, hehehehe.
Thanks a lot.

[Loïc]

No problem, It required ages for me to understand