Windows图像采集 – 在C#中设置设备属性

发布时间：2020-12-14 02:53:06 所属栏目：Windows 来源：网络整理

导读：我有一个C#(WinForm)程序,支持使用WIA进行扫描.我正在尝试在扫描一个或多个文档之前设置设备属性.主要是我想设置扫描仪的纸张尺寸.以下是代码片段： foreach (Property property in selectedDevice.Properties){ //WiaProperties.WiaDpsHorizontalBedSize is

我有一个C#(WinForm)程序,支持使用WIA进行扫描.我正在尝试在扫描一个或多个文档之前设置设备属性.主要是我想设置扫描仪的纸张尺寸.以下是代码片段：

foreach (Property property in selectedDevice.Properties)
{
   //WiaProperties.WiaDpsHorizontalBedSize is my constant
   if (property.PropertyID == WiaProperties.WiaDpsHorizontalBedSize)
   {
       //Set property value here...             
   }
}

我找到了水平床尺寸属性,但问题是如何将其设置为值？有一个属性的set_Value属性,但似乎需要引用一个结果对象.所以我不知道如何在设备上设置属性？

解决方法

我正在研究一个扫描项目,而且很少有WIA例子.此代码是您要设置床大小,DPI等的代码.请查看SetProperty方法,并提供有关如何处理set_Value的示例.

class Scan
{
    // Scanner only device properties (DPS)
    public const int WIA_RESERVED_FOR_NEW_PROPS = 1024;
    public const int WIA_DIP_FIRST = 2;
    public const int WIA_DPA_FIRST = WIA_DIP_FIRST + WIA_RESERVED_FOR_NEW_PROPS;
    public const int WIA_DPC_FIRST = WIA_DPA_FIRST + WIA_RESERVED_FOR_NEW_PROPS;
    public const int WIA_DPS_FIRST = WIA_DPC_FIRST + WIA_RESERVED_FOR_NEW_PROPS;
    public const int WIA_DPS_DOCUMENT_HANDLING_STATUS = WIA_DPS_FIRST + 13;
    public const int WIA_DPS_DOCUMENT_HANDLING_SELECT = WIA_DPS_FIRST + 14;
    public const int FEEDER = 1;
    public const int FLATBED = 2;
    public const int DUPLEX = 4;
    public const int FEED_READY = 1;

    WIA.CommonDialog _dialog = new WIA.CommonDialog();
    WIA.Device _scanner;

    public void ADFScan()
    {

        _dialog = new CommonDialogClass();
        _scanner = _dialog.ShowSelectDevice(WIA.WiaDeviceType.ScannerDeviceType,false,false);


        foreach (Property item in _scanner.Items[1].Properties)
        {
            switch (item.PropertyID)
            {
                case 6146: //4 is Black-white,gray is 2,color 1
                    SetProperty(item,2);
                    break;
                case 6147: //dots per inch/horizontal 
                    SetProperty(item,100);
                    break;
                case 6148: //dots per inch/vertical 
                    SetProperty(item,100);
                    break;
                case 6149: //x point where to start scan 
                    SetProperty(item,0);
                    break;
                case 6150: //y-point where to start scan 
                    SetProperty(item,0);
                    break;
                case 6151: //horizontal exent 
                    SetProperty(item,(int)(8.5 * 100));
                    break;
                case 6152: //vertical extent 
                    SetProperty(item,11 * 100);
                    break;
            }
        }
        ImageFile image = (ImageFile)_scanner.Items[1].Transfer(FormatID.wiaFormatPNG);
        System.IO.File.Delete("tmp.png");
        image.SaveFile("tmp.png");
    }

    private void SetProperty(Property property,int value)
    {
        IProperty x = (IProperty)property;
        Object val = value;
        x.set_Value(ref val);
    }


    public void test()
    {
        bool WantsToScan = true;
        while (WantsToScan) ScanAndSaveOnePage();

    }


    static void Main(string[] args)
    {
        new Scan().test();
    }
}

（编辑：李大同）

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