Scanning from the ADF using WIA in C#

Updated on Wednesday, June 2, 2021

Comments Page 3

Comments

Sorry bad link, try: http://msdn.microsoft.com/en-u...

∞ | by Rob Ellison on Wednesday, August 25 2010

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....

∞ | by Rob Ellison on Wednesday, August 25 2010

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

∞ | by Aurelio on Wednesday, August 25 2010

Hugh - very nice! Thanks for sharing that.

∞ | by Rob Ellison on Friday, August 6 2010

(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:

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)); } }

∞ | by Hugh on Friday, August 6 2010

Here are the methods to drop in:

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; }

∞ | by Rob Ellison on Thursday, August 5 2010

Can you post the full code? I can't resolve SetItemIntProperty or SetDeviceIntProperty.

Thanks,
Hugh

∞ | by Hugh on Thursday, August 5 2010