Setting PixelType and BitDepth on a Twain 1.8 scanner

[LouisKenney]

Hi,

I have developed an app against a version 1.9 scanner and everything works fine.

However if i run the code against a version 1.8 scanner it does not set the Pixel Type or Bit Depth values.

I checked the ordering from the CapOrder pdf and I believe its the right order.

Is there any known issues with version 1.8 which would cause the above problem.

Any ideas?

Louis

[gabe]

What rc are you getting when you set the caps?
If you’re getting an rc=failure what cc are you getting?
What device?

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[LouisKenney]

Hi,

The scanner is a Mustek A3 USB.

The Rc results are Success.

Would the cc results give any more information, if so how do you find the cc result?

Thanks

Louis

[gabe]

no the cc isn’t interesting unless rc=failure, less than interesting – worthless.

so you get rc=success… are you verifying the value after the msg_set?
while not usually needed it could be considered a best practice to run the msg_get after the msg_set to double check that the rcSuccess was in fact a success,… but in this case I don’t see how it helps…

list all the caps you set in the order you set them in.
maybe something will jump out

.

[LouisKenney]

Order is as follows ….

OpenDSM
openDS

Get support caps and validate it has what I need.
Check that each cap supports the values I want to set it to.

Set the following caps..

FeederEnabled
XferCount
Inches
IPixelType
IBitDepth
IXResolution
IYResolution

Then I validate that the settings that I have just set have been setup.

EnableDS

….transfer image

Thanks

Louis

[gabe]

and you validate by running the msg_get? or are you looking at the imageinfo struct when the image comes over?

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[LouisKenney]

I do msg_gets at the validate stage and the check stage (before I set them)

Louis

[gabe]

offtopic while I think about your actual question- you don’t set IUnits.
Why?

.

[gabe]

odd. sounds&looks like you’re doing the right stuff at the right time.
After your msg_set ops what value(s) are you getting from msg_get, msg_getcurrent & msg_getDefault?

Run twister on the thing and post the results, it should look something like this:

@twister report snippet wrote:

Start of Twister TWAIN Analysis
Analysis Started: 2004.04.27 at 11:41:15
Twister Version: 1.03.006
— TW_IDENTITY block —
Product Name: ScanExpress A3 USB
Product Family:
Manufacturer:
Software Version: 62280.2233 (“F/B Scanner”)
TWAIN Protocol Version: 1.8
— DataSource File Version Info —
File: C:WINNTTwain_32L3U16Scanobj.ds
File Timestamp: 2004.04.05 08:16:38
File version: 2.6.1.1
Product version: 2.6.1.1
Description: TWAIN Module
Copyright: Copyright c 1999
Comments:
Company: Common Group
File Version: 2, 6, 1, 1
Internal Name: Nora
Language:
Legal Trademarks:
Original Filename: Scanobj.ds
Private Build:
Product Name: TWAIN Modlue
Product Version: 2, 6, 1, 1
Special Build:
Section 1. Capabilities
If a capability does not appear in the following list, then the device
reported it as unsupported, and this conforms to the TWAIN standard.
— Capability — — Value —
ICAP_PIXELTYPE: GET……………..uint16 ENUM{ TWPT_BW, TWPT_GRAY,
TWPT_RGB } Current: TWPT_RGB,
Default: TWPT_RGB
ICAP_PIXELTYPE: GETCURRENT……….uint16 TWPT_RGB
ICAP_PIXELTYPE: GETDEFAULT……….uint16 TWPT_RGB
ICAP_BITDEPTH: GET……………..*uint16 ENUM{ 1, 8,
16 } Current: 16, Default: 16
ICAP_BITDEPTH: GETCURRENT………..ditto
ICAP_BITDEPTH: GETDEFAULT………..ditto
— Compliance Summary —
(12) ICAP_BITDEPTH: MSG_GET enumeration Current index (8) is invalid.
(13) ICAP_BITDEPTH: MSG_GET enumeration Default index (8) is invalid.

[LouisKenney]

Sorry, copied it wrong. Inches should be IUnits

Louis

[gabe]

oh, and what are the values are you setting to?

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