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我正在 C# 上开发一个窗口应用程序。为此，我安装了驱动程序 WIA 并从“ http://www.fujitsu.com/global/support/computing/peripheral/scanners/drivers/twain/v9211307.html”-“Ft9l10bX5.exe ”获取。

我的代码：

class WIAScanner
    {
        const string wiaFormatBMP = "{B96B3CAB-0728-11D3-9D7B-0000F81EF32E}";

        class WIA_DPS_DOCUMENT_HANDLING_SELECT
        {
            public const uint FEEDER = 0x00000001;
            public const uint FLATBED = 0x00000002;
        }

        class WIA_DPS_DOCUMENT_HANDLING_STATUS
        {
            public const uint FEED_READY = 0x00000001;
        }

        class WIA_PROPERTIES
        {
            public const uint WIA_RESERVED_FOR_NEW_PROPS = 1024;
            public const uint WIA_DIP_FIRST = 2;
            public const uint WIA_DPA_FIRST = WIA_DIP_FIRST + WIA_RESERVED_FOR_NEW_PROPS;
            public const uint WIA_DPC_FIRST = WIA_DPA_FIRST + WIA_RESERVED_FOR_NEW_PROPS;
            //
            // Scanner only device properties (DPS)
            //
            public const uint WIA_DPS_FIRST = WIA_DPC_FIRST + WIA_RESERVED_FOR_NEW_PROPS;
            public const uint WIA_DPS_DOCUMENT_HANDLING_STATUS = WIA_DPS_FIRST + 13;
            public const uint WIA_DPS_DOCUMENT_HANDLING_SELECT = WIA_DPS_FIRST + 14;
        }

        /// <summary>
        /// Use scanner to scan an image (with user selecting the scanner from a dialog).
        /// </summary>
        /// <returns>Scanned images.</returns>
        public static List<Image> Scan()
        {
            WIA.ICommonDialog dialog = new WIA.CommonDialog();
            WIA.Device device = dialog.ShowSelectDevice(WIA.WiaDeviceType.UnspecifiedDeviceType, true, false);

            if (device != null)
            {
                return Scan(device.DeviceID);
            }
            else
            {
                throw new Exception("You must select a device for scanning.");
            }
        }

        /// <summary>
        /// Use scanner to scan an image (scanner is selected by its unique id).
        /// </summary>
        /// <param name="scannerName"></param>
        /// <returns>Scanned images.</returns>
        public static List<Image> Scan(string scannerId)
        {
            List<Image> images = new List<Image>();

            bool hasMorePages = true;
            while (hasMorePages)
            {
                // select the correct scanner using the provided scannerId parameter
                WIA.DeviceManager manager = new WIA.DeviceManager();
                WIA.Device device = null;
                foreach (WIA.DeviceInfo info in manager.DeviceInfos)
                {
                    if (info.DeviceID == scannerId)
                    {
                        // connect to scanner
                        device = info.Connect();
                        break;
                    }
                }

                // device was not found
                if (device == null)
                {
                    // enumerate available devices
                    string availableDevices = "";
                    foreach (WIA.DeviceInfo info in manager.DeviceInfos)
                    {
                        availableDevices += info.DeviceID + "\n";
                    }

                    // show error with available devices
                    throw new Exception("The device with provided ID could not be found. Available Devices:\n" + availableDevices);
                }

                WIA.Item item = device.Items[1] as WIA.Item;

                try
                {
                    // scan image
                    WIA.ICommonDialog wiaCommonDialog = new WIA.CommonDialog();
                    WIA.ImageFile image = (WIA.ImageFile)wiaCommonDialog.ShowTransfer(item, wiaFormatBMP, false);

                    // save to temp file
                    string fileName = Path.GetTempFileName();

                }
                catch (Exception exc)
                {
                    throw exc;
                }
                finally
                {
                    item = null;

                    //determine if there are any more pages waiting
                    WIA.Property documentHandlingSelect = null;
                    WIA.Property documentHandlingStatus = null;

                    foreach (WIA.Property prop in device.Properties)
                    {
                        if (prop.PropertyID == WIA_PROPERTIES.WIA_DPS_DOCUMENT_HANDLING_SELECT)
                            documentHandlingSelect = prop;

                        if (prop.PropertyID == WIA_PROPERTIES.WIA_DPS_DOCUMENT_HANDLING_STATUS)
                            documentHandlingStatus = prop;
                    }

                    // assume there are no more pages
                    hasMorePages = false;

                    // may not exist on flatbed scanner but required for feeder
                    if (documentHandlingSelect != null)
                    {
                        // check for document feeder
                        if ((Convert.ToUInt32(documentHandlingSelect.get_Value()) & WIA_DPS_DOCUMENT_HANDLING_SELECT.FEEDER) != 0)
                        {
                            hasMorePages = ((Convert.ToUInt32(documentHandlingStatus.get_Value()) & WIA_DPS_DOCUMENT_HANDLING_STATUS.FEED_READY) != 0);
                        }
                    }
                }
            }

            return images;
        }

    }

现在的问题是：它在“平板扫描仪”上运行良好但是当我尝试使用 fijustu 的 fi-6140（单张纸扫描仪）时。它向我显示错误：

“价值不在预期范围内。” 从这一行开始：“WIA.ImageFile image = (WIA.ImageFile)wiaCommonDialog.ShowTransfer(item, wiaFormatBMP, false);”

所以，让我知道我缺少什么配置。

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2 回答 2

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我的 fi-6310z 也遇到了同样的问题。我花了一段时间才弄清楚，但似乎问题出在设备上的 Pages 属性上（设备属性 ID 3096）。看起来它默认设置为0。如果您手动将其设置为 1，则 ShowTransfer 可以正常工作。我不确定这是否会影响您确定是否有更多页面的方式，因为您概述的方法不适用于我的扫描仪（文档处理状态始终为 5）。

于 2013-10-08T23:06:09.600 回答
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尝试了“Boanerge”提到的 SetDeviceProperty 并始终如一地工作，首先删除了旧文件，使用了 thread.sleep(2000); 在扫描之前和之后以及在保存文件之前，它都有效。

于 2021-01-19T16:07:51.903 回答