C# and SEHException when reading capability, any idea

[Denis]

hey,

i am trying to query capabilities and get SEHException with one of my scanners (HP 4700). when I query this capability with Twacker it works fine. Does anybody have any idea what i can look? any general trace or something. it seems that i send everything right (at least on many different scanners it works fine too).

i initialize TW_CAPABILITY following:

[StructLayout(LayoutKind.Sequential, Pack = 2)]
public class Tw_Capability
{
public ushort Capability;
public ushort ContainerType;
public IntPtr hContainer;
….
}

t.Capability= (ushort)cap;
t.ContainerType= 0xffff;
t.hContainer = IntPtr.Zero;

i really lost what i can do to investigate the issue 🙁

thank you!
Denis

[fct]

Try with the WIA Twain source for the scanner.

If it works, you might be facing a problem with HP’s TWAIN drivers. I’ve hit that with another model of them, see this thread in their support forums:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1295266215776+28353475&threadId=1269328

[Denis]

yes, with WIA it works fine. i barely can understand why it works with native code and does not with managed. also as i see in your thread the problem is 2-3 years old and i have new drivers. very strange…

THANK YOU VERY MUCH for this point!

[Author]

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