How to set Automatic border detection

[ff.in.twain]

Hi,

I’m writing a win32C++ twain application to operate EPSON 10000XL flatbed scanner. I have been able to open and scan images successfully. But I’m struggling to change the capabilities.

Specillay I want to set the following two boolean capabilities to TRUE.
ICAP_AUTOMATICBORDERDETECTION
ICAP_AUTOMATICROTATE

I tried it in the following manner.

– Load the TWAIN DLL and collect DSM Entry Proc.

– Send triplet (DG_CONTROL,DAT_PARENT,MSG_OPENDSM):
received success.

– Send triplet (DG_CONTROL,DAT_IDENTITY,MSG_USERSELECT):
received success. Selected 10000XL.

– Send triplet (DG_CONTROL,DAT_IDENTITY,MSG_OPENDS):
received success.

– Send triplet (DG_CONTROL,DAT_CAPABILITY,MSG_SET):
twCapability.Cap = CAP_XFERCOUNT;
twCapability.ConType = TWON_ONEVALUE;
value is set to 1
received success.

– Send triplet (DG_CONTROL,DAT_CAPABILITY,MSG_SET):
twCapability.Cap = ICAP_UNDEFINEDIMAGESIZE;
twCapability.ConType = TWON_ONEVALUE;
value is set to TRUE (1)
received failure

– Send triplet (DG_CONTROL,DAT_CAPABILITY,MSG_SET):
twCapability.Cap = ICAP_AUTOMATICBORDERDETECTION;
twCapability.ConType = TWON_ONEVALUE;
value is set to TRUE (1)
received failure

Please help me to find out what causes my last two calls to fail.

Thanking you in advance.

Best Regards,

FF

[Dark Angel]

maybe the source doesn’t support this capability

try to negotiate the source about the capability if it’s supported.

DG_Control/ DAT_Capability/ MSG_QuerySupport

if it returns 0 then the capability is not supported
if it returns 13 the capability is readonly
if it returns 31 the capability is supported

[Author]

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