Scanning from the ADF using WIA in C#
Updated on Wednesday, June 2, 2021
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Sorry bad link, try: http://msdn.microsoft.com/en-u...
Aurelio, _adf in the above snippet is set by the use - true to use the feeder, false to use the flat bed. It then sets the appropriate mode.
To see if the scanner has a flat bed check the WIA_DPS_DOCUMENT_HANDLING_CAPABILITIES property (http://msdn.microsoft.com/en-u....
How do you determine the value of the "_adf" variable? I need to detect if the scanner has a flatbed, but I can't figure out how to do it.
Thanks,
Aurelio
Hugh - very nice! Thanks for sharing that.
(grin) Thanks Rob. I've been reading a bunch about WIA the last couple days and I just went ahead and implemented those yesterday afternoon as Extension methods on the Properties object and also another helpful one on the COMException object. Check 'em out:
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| using System.Runtime.InteropServices; | |
| using WIA; | |
| using System.Drawing.Imaging; | |
| namespace WIA2test | |
| { | |
| public static class WIAExtender | |
| { | |
| public static string TiffFormat = ImageFormat.Tiff.Guid.ToString("B"); | |
| // copies of constants that are found in WiaDef.h | |
| public const int WIAFacility = 33; | |
| public const int WIA_ERROR_GENERAL_ERROR = 1; | |
| public const int WIA_ERROR_PAPER_JAM = 2; | |
| public const int WIA_ERROR_PAPER_EMPTY = 3; | |
| public const int WIA_ERROR_PAPER_PROBLEM = 4; | |
| public const int WIA_ERROR_OFFLINE = 5; | |
| public const int WIA_ERROR_BUSY = 6; | |
| public const int WIA_ERROR_WARMING_UP = 7; | |
| public const int WIA_ERROR_USER_INTERVENTION = 8; | |
| public const int WIA_ERROR_ITEM_DELETED = 9; | |
| public const int WIA_ERROR_DEVICE_COMMUNICATION = 10; | |
| public const int WIA_ERROR_INVALID_COMMAND = 11; | |
| public const int WIA_ERROR_INCORRECT_HARDWARE_SETTING = 12; | |
| public const int WIA_ERROR_DEVICE_LOCKED = 13; | |
| public const int WIA_ERROR_EXCEPTION_IN_DRIVER = 14; | |
| public const int WIA_ERROR_INVALID_DRIVER_RESPONSE = 15; | |
| public const int WIA_S_NO_DEVICE_AVAILABLE = 21; | |
| public const int WIA_COMPRESSION_JPEG = 5; | |
| public const int WIA_PROPERTY_CurrentIntent = 6146; | |
| public const int WIA_PROPERTY_HorizontalResolution = 6147; | |
| public const int WIA_PROPERTY_VerticalResolution = 6148; | |
| public const int WIA_PROPERTY_HorizontalExtent = 6151; | |
| public const int WIA_PROPERTY_VerticalExtent = 6152; | |
| public const int WIA_PROPERTY_DocumentHandlingSelect = 3088; | |
| public const int WIA_PROPERTY_DocumentHandlingStatus = 3087; | |
| public const int WIA_PROPERTY_BitsPerPixel = 4104; | |
| public const int WIA_PROPERTY_Format = 4106; | |
| public const int WIA_PROPERTY_Compression = 4107; | |
| public const int WIA_PROPERTY_VALUE_Color = 1; | |
| public const int WIA_PROPERTY_VALUE_Gray = 2; | |
| public const int WIA_PROPERTY_VALUE_BlackAndWhite = 4; | |
| public static string GetErrorCodeDescription(int errorCode) | |
| { | |
| string desc = null; | |
| switch (errorCode) | |
| { | |
| case (WIA_ERROR_GENERAL_ERROR): | |
| { | |
| desc = "A general error occurred"; | |
| break; | |
| } | |
| case (WIA_ERROR_PAPER_JAM): | |
| { | |
| desc = "There is a paper jam"; | |
| break; | |
| } | |
| case (WIA_ERROR_PAPER_EMPTY): | |
| { | |
| desc = "The feeder tray is empty"; | |
| break; | |
| } | |
| case (WIA_ERROR_PAPER_PROBLEM): | |
| { | |
| desc = "There is a problem with the paper"; | |
| break; | |
| } | |
| case (WIA_ERROR_OFFLINE): | |
| { | |
| desc = "The scanner is offline"; | |
| break; | |
| } | |
| case (WIA_ERROR_BUSY): | |
| { | |
| desc = "The scanner is busy"; | |
| break; | |
| } | |
| case (WIA_ERROR_WARMING_UP): | |
| { | |
| desc = "The scanner is warming up"; | |
| break; | |
| } | |
| case (WIA_ERROR_USER_INTERVENTION): | |
| { | |
| desc = "The scanner requires user intervention"; | |
| break; | |
| } | |
| case (WIA_ERROR_ITEM_DELETED): | |
| { | |
| desc = "An unknown error occurred"; | |
| break; | |
| } | |
| case (WIA_ERROR_DEVICE_COMMUNICATION): | |
| { | |
| desc = "An error occurred attempting to communicate with the scanner"; | |
| break; | |
| } | |
| case (WIA_ERROR_INVALID_COMMAND): | |
| { | |
| desc = "The scanner does not understand this command"; | |
| break; | |
| } | |
| case (WIA_ERROR_INCORRECT_HARDWARE_SETTING): | |
| { | |
| desc = "The scanner has an incorrect hardware setting"; | |
| break; | |
| } | |
| case (WIA_ERROR_DEVICE_LOCKED): | |
| { | |
| desc = "The scanner device is in use by another application"; | |
| break; | |
| } | |
| case (WIA_ERROR_EXCEPTION_IN_DRIVER): | |
| { | |
| desc = "The scanner driver reported an error"; | |
| break; | |
| } | |
| case (WIA_ERROR_INVALID_DRIVER_RESPONSE): | |
| { | |
| desc = "The scanner driver gave an invalid response"; | |
| break; | |
| } | |
| default: | |
| { | |
| desc = "An unknown error occurred"; | |
| break; | |
| } | |
| } | |
| return desc; | |
| } | |
| public static int GetWIAErrorCode(this COMException cx) | |
| { | |
| int origErrorMsg = cx.ErrorCode; | |
| int errorCode = origErrorMsg & 0xFFFF; | |
| int errorFacility = ((origErrorMsg) >> 16) & 0x1fff; | |
| if (errorFacility == WIAFacility) | |
| return errorCode; | |
| return -1; | |
| } | |
| public static void SetProperty(this WIA.Properties searchBag, int propID, object propValue) | |
| { | |
| foreach (Property prop in searchBag) | |
| { | |
| if (prop.PropertyID == propID) | |
| { | |
| prop.set_Value(ref propValue); | |
| return; | |
| } | |
| } | |
| } | |
| public static object GetProperty(this WIA.Properties searchBag, int propID) | |
| { | |
| foreach (Property prop in searchBag) | |
| { | |
| if (prop.PropertyID == propID) | |
| { | |
| return prop.get_Value(); | |
| } | |
| } | |
| return null; | |
| } | |
| } | |
| } | |
| // Then the usage looks like: | |
| // item.Properties.SetProperty(WIAExtender.WIA_PROPERTY_CurrentIntent, WIAExtender.WIA_PROPERTY_VALUE_Gray); | |
| // int handlingStatus = (int)scannerDevice.Properties.GetProperty(WIAExtender.WIA_PROPERTY_DocumentHandlingStatus); | |
| try | |
| { | |
| // some WIA operation | |
| } | |
| catch (COMException cx) | |
| { | |
| int comErrorCode = cx.GetWIAErrorCode(); | |
| if (comErrorCode > 0) | |
| { | |
| MessageBox.Show(WIAExtender.GetErrorCodeDescription(comErrorCode)); | |
| } | |
| } |
Here are the methods to drop in:
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| private void SetDeviceIntProperty(ref Device device, int propertyID, int propertyValue) | |
| { | |
| foreach (Property p in device.Properties) | |
| { | |
| if (p.PropertyID == propertyID) | |
| { | |
| object value = propertyValue; | |
| p.set_Value(ref value); | |
| break; | |
| } | |
| } | |
| } | |
| private int GetDeviceIntProperty(ref Device device, int propertyID) | |
| { | |
| int ret = -1; | |
| foreach (Property p in device.Properties) | |
| { | |
| if (p.PropertyID == propertyID) | |
| { | |
| ret = (int)p.get_Value(); | |
| break; | |
| } | |
| } | |
| return ret; | |
| } | |
| private void SetItemIntProperty(ref Item item, int propertyID, int propertyValue) | |
| { | |
| foreach (Property p in item.Properties) | |
| { | |
| if (p.PropertyID == propertyID) | |
| { | |
| object value = propertyValue; | |
| p.set_Value(ref value); | |
| break; | |
| } | |
| } | |
| } | |
| private int GetItemIntProperty(ref Item item, int propertyID) | |
| { | |
| int ret = -1; | |
| foreach (Property p in item.Properties) | |
| { | |
| if (p.PropertyID == propertyID) | |
| { | |
| ret = (int)p.get_Value(); | |
| break; | |
| } | |
| } | |
| return ret; | |
| } |
Can you post the full code? I can't resolve SetItemIntProperty or SetDeviceIntProperty.
Thanks,
Hugh
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