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xJonathanLEI / escl-rs

A Rust library for discovering and using scanners via the eSCL protocol (scanning over network)
Apache License 2.0
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Fails with Brother MFC-J497DW #1

Closed FlorianLudwig closed 10 months ago

FlorianLudwig commented 10 months ago

When running the example code it does find my Brother MFC-J497DW but fails with:

thread 'main' panicked at 'unable to fetch capabilities: Xml(Custom { field: "duplicate field `ColorSpace`" })', examples/scan.rs:29:10
xJonathanLEI commented 10 months ago

Hi @FlorianLudwig, thanks for the report. I wasn't really expecting anyone to actually use this lol, so I modeled the whole thing after my own scanner instead of strict adherence to the specs (well... the spec itself is kinda poorly written..).

It would definitely help if you can post the curl result of capabilities call, something like:

curl http://1.2.3.4/eSCL/ScannerCapabilities
FlorianLudwig commented 10 months ago

I wasn't really expecting anyone to actually use this lol, so I modeled the whole thing after my own scanner instead of strict adherence to the specs (well... the spec itself is kinda poorly written..).

Oh well, I am also just playing around - and i have no idea if my scanner adheres to the specs :shrug:

curl http://1.2.3.4/eSCL/ScannerCapabilities

<?xml version="1.0" encoding="UTF-8"?>
<scan:ScannerCapabilities
xmlns:scan="http://schemas.hp.com/imaging/escl/2011/05/03"
xmlns:pwg="http://www.pwg.org/schemas/2010/12/sm"
xmlns:dest="http://schemas.hp.com/imaging/destination/2011/06/06"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://schemas.hp.com/imaging/escl/2011/05/03 ../../schemas/eSCL-1_92.xsd">
<pwg:Version>2.63</pwg:Version>
<pwg:MakeAndModel>Brother MFC-J497DW</pwg:MakeAndModel>
<pwg:SerialNumber>...</pwg:SerialNumber>
<scan:UUID>...</scan:UUID>
<scan:AdminURI>http://.../net/net/airprint.html</scan:AdminURI>
<scan:IconURI>http://.../icons/device-icons-128.png</scan:IconURI>
<scan:Platen>
<scan:PlatenInputCaps>
<scan:MinWidth>16</scan:MinWidth>
<scan:MaxWidth>2550</scan:MaxWidth>
<scan:MinHeight>16</scan:MinHeight>
<scan:MaxHeight>3507</scan:MaxHeight>
<scan:MaxScanRegions>1</scan:MaxScanRegions>
<scan:SettingProfiles>
<scan:SettingProfile>
<scan:ColorModes>
<scan:ColorMode>BlackAndWhite1</scan:ColorMode>
<scan:ColorMode>Grayscale8</scan:ColorMode>
<scan:ColorMode>RGB24</scan:ColorMode>
</scan:ColorModes>
<scan:DocumentFormats>
<pwg:DocumentFormat>application/pdf</pwg:DocumentFormat>
<pwg:DocumentFormat>image/jpeg</pwg:DocumentFormat>
<scan:DocumentFormatExt>application/pdf</scan:DocumentFormatExt>
<scan:DocumentFormatExt>image/jpeg</scan:DocumentFormatExt>
</scan:DocumentFormats>
<scan:SupportedResolutions>
<scan:DiscreteResolutions>
<scan:DiscreteResolution>
<scan:XResolution>100</scan:XResolution>
<scan:YResolution>100</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>200</scan:XResolution>
<scan:YResolution>200</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>300</scan:XResolution>
<scan:YResolution>300</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>600</scan:XResolution>
<scan:YResolution>600</scan:YResolution>
</scan:DiscreteResolution>
</scan:DiscreteResolutions>
</scan:SupportedResolutions>
<scan:ColorSpaces>
<scan:ColorSpace>CMYK</scan:ColorSpace>
<scan:ColorSpace>YCC</scan:ColorSpace>
<scan:ColorSpace>sRGB</scan:ColorSpace>
</scan:ColorSpaces>
<scan:CcdChannels>
<scan:CcdChannel>Red</scan:CcdChannel>
<scan:CcdChannel>Green</scan:CcdChannel>
<scan:CcdChannel>Blue</scan:CcdChannel>
<scan:CcdChannel>NTSC</scan:CcdChannel>
<scan:CcdChannel>GrayCcd</scan:CcdChannel>
<scan:CcdChannel>GrayCcdEmulated</scan:CcdChannel>
</scan:CcdChannels>
<scan:BinaryRenderings>
<scan:BinaryRendering>Halftone</scan:BinaryRendering>
<scan:BinaryRendering>Threshold</scan:BinaryRendering>
</scan:BinaryRenderings>
</scan:SettingProfile>
</scan:SettingProfiles>
<scan:SupportedIntents>
<scan:Intent>Document</scan:Intent>
<scan:Intent>TextAndGraphic</scan:Intent>
<scan:Intent>Photo</scan:Intent>
<scan:Intent>Preview</scan:Intent>
</scan:SupportedIntents>
<scan:MaxOpticalXResolution>1200</scan:MaxOpticalXResolution>
<scan:MaxOpticalYResolution>2400</scan:MaxOpticalYResolution>
<scan:RiskyLeftMargin>0</scan:RiskyLeftMargin>
<scan:RiskyRightMargin>0</scan:RiskyRightMargin>
<scan:RiskyTopMargin>0</scan:RiskyTopMargin>
<scan:RiskyBottomMargin>0</scan:RiskyBottomMargin>
<scan:MaxPhysicalWidth>2550</scan:MaxPhysicalWidth>
<scan:MaxPhysicalHeight>3507</scan:MaxPhysicalHeight>
</scan:PlatenInputCaps>
</scan:Platen>
<scan:Adf>
<scan:AdfSimplexInputCaps>
<scan:MinWidth>16</scan:MinWidth>
<scan:MaxWidth>2550</scan:MaxWidth>
<scan:MinHeight>16</scan:MinHeight>
<scan:MaxHeight>4200</scan:MaxHeight>
<scan:MaxScanRegions>1</scan:MaxScanRegions>
<scan:SettingProfiles>
<scan:SettingProfile>
<scan:ColorModes>
<scan:ColorMode>BlackAndWhite1</scan:ColorMode>
<scan:ColorMode>Grayscale8</scan:ColorMode>
<scan:ColorMode>RGB24</scan:ColorMode>
</scan:ColorModes>
<scan:DocumentFormats>
<pwg:DocumentFormat>application/pdf</pwg:DocumentFormat>
<pwg:DocumentFormat>image/jpeg</pwg:DocumentFormat>
<scan:DocumentFormatExt>application/pdf</scan:DocumentFormatExt>
<scan:DocumentFormatExt>image/jpeg</scan:DocumentFormatExt>
</scan:DocumentFormats>
<scan:SupportedResolutions>
<scan:DiscreteResolutions>
<scan:DiscreteResolution>
<scan:XResolution>100</scan:XResolution>
<scan:YResolution>100</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>200</scan:XResolution>
<scan:YResolution>200</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>300</scan:XResolution>
<scan:YResolution>300</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>600</scan:XResolution>
<scan:YResolution>600</scan:YResolution>
</scan:DiscreteResolution>
</scan:DiscreteResolutions>
</scan:SupportedResolutions>
<scan:ColorSpaces>
<scan:ColorSpace>CMYK</scan:ColorSpace>
<scan:ColorSpace>YCC</scan:ColorSpace>
<scan:ColorSpace>sRGB</scan:ColorSpace>
</scan:ColorSpaces>
<scan:CcdChannels>
<scan:CcdChannel>Red</scan:CcdChannel>
<scan:CcdChannel>Green</scan:CcdChannel>
<scan:CcdChannel>Blue</scan:CcdChannel>
<scan:CcdChannel>NTSC</scan:CcdChannel>
<scan:CcdChannel>GrayCcd</scan:CcdChannel>
<scan:CcdChannel>GrayCcdEmulated</scan:CcdChannel>
</scan:CcdChannels>
<scan:BinaryRenderings>
<scan:BinaryRendering>Halftone</scan:BinaryRendering>
<scan:BinaryRendering>Threshold</scan:BinaryRendering>
</scan:BinaryRenderings>
</scan:SettingProfile>
</scan:SettingProfiles>
<scan:SupportedIntents>
<scan:Intent>Document</scan:Intent>
<scan:Intent>TextAndGraphic</scan:Intent>
<scan:Intent>Photo</scan:Intent>
<scan:Intent>Preview</scan:Intent>
</scan:SupportedIntents>
<scan:MaxOpticalXResolution>1200</scan:MaxOpticalXResolution>
<scan:MaxOpticalYResolution>600</scan:MaxOpticalYResolution>
<scan:RiskyLeftMargin>0</scan:RiskyLeftMargin>
<scan:RiskyRightMargin>0</scan:RiskyRightMargin>
<scan:RiskyTopMargin>0</scan:RiskyTopMargin>
<scan:RiskyBottomMargin>0</scan:RiskyBottomMargin>
<scan:MaxPhysicalWidth>2550</scan:MaxPhysicalWidth>
<scan:MaxPhysicalHeight>4200</scan:MaxPhysicalHeight>
</scan:AdfSimplexInputCaps>
<scan:FeederCapacity>20</scan:FeederCapacity>
<scan:AdfOptions>
<scan:AdfOption>DetectPaperLoaded</scan:AdfOption>
</scan:AdfOptions>
</scan:Adf>
<scan:StoredJobRequestSupport>
<scan:MaxStoredjobRequests>0</scan:MaxStoredjobRequests>
<scan:TimeoutInSeconds>0</scan:TimeoutInSeconds>
</scan:StoredJobRequestSupport>
<scan:MaxJobNameLength>63</scan:MaxJobNameLength>
<scan:BlankPageDetection>false</scan:BlankPageDetection>
<scan:BlankPageDetectionAndRemoval>false</scan:BlankPageDetectionAndRemoval>
</scan:ScannerCapabilities>

note: i redacted a few entries as I am not sure how sensitive they are:


<pwg:SerialNumber>...</pwg:SerialNumber>
<scan:UUID>...</scan:UUID>
<scan:AdminURI>http://.../net/net/airprint.html</scan:AdminURI>
<scan:IconURI>http://.../icons/device-icons-128.png</scan:IconURI>
xJonathanLEI commented 10 months ago

Thanks for the info. I just pushed https://github.com/xJonathanLEI/escl-rs/commit/1be863b226f9caf82ab19a370c73693b5df7b7d3 which makes the library capable of deserializing capabilities for this specific scanner. Made some changes to the struct definitions.

I originally generated the struct definitions directly off of my scanner's ScannerCapabilities response, and it looks like that in XML it's hard to tell whether it's a field or an array element when it's the only element in a sequence... It's so good that the world has moved on from XML...

Anyways, the example should work now, though the whole lib is still extremely rough. I made this lib for one of my side projects, so the main goal was simply to make it work for my scanner lol.

FlorianLudwig commented 10 months ago

Example works now, thanks!