Set page size using WIA (with scanner)

Question

Hello, I'm using WIA to acquire images from a scanner with C#. I can scan the papers, but I can't set up the page size correctly, it always defaults to A4 and I need to use Letter or Legal sometimes.

I tried with the WIA_DPS_PAGE_SIZE property, but when I try to set a value, I always get an error, that the value is out of the interval (tried a lot of possible values).

I wan't to be able to use WIA_DPS_PAGE_SIZE = WIA_PAGE_AUTO (for automatic page size), but I can't find anything on the web related to this.

Does anyone know a solution? thanks!

Answer 1

Hi Salvador,

I know this is probably too late to actually help you with that but it may become handy for future reference. To change scanned items properties use such code:

        WIA.CommonDialog wiaDlg;
        WIA.Device wiaDevice;
        WIA.DeviceManager wiaManager = new DeviceManager();

        wiaDlg = new WIA.CommonDialog();
        wiaDevice = wiaDlg.ShowSelectDevice(WiaDeviceType.ScannerDeviceType, false, false);

        foreach (WIA.Item item in wiaDevice.Items)
        {
            StringBuilder propsbuilder = new StringBuilder();

            foreach (WIA.Property itemProperty in item.Properties)
            {
                IProperty tempProperty;
                Object tempNewProperty;

                if (itemProperty.Name.Equals("Horizontal Resolution"))
                {
                    tempNewProperty = 75;
                    ((IProperty)itemProperty).set_Value(ref tempNewProperty);
                }
                else if (itemProperty.Name.Equals("Vertical Resolution"))
                {
                    tempNewProperty = 75;
                    ((IProperty)itemProperty).set_Value(ref tempNewProperty);
                }
                else if (itemProperty.Name.Equals("Horizontal Extent"))
                {
                    tempNewProperty = 619;
                    ((IProperty)itemProperty).set_Value(ref tempNewProperty);
                }
                else if (itemProperty.Name.Equals("Vertical Extent"))
                {
                    tempNewProperty = 876;
                    ((IProperty)itemProperty).set_Value(ref tempNewProperty);
                }
            }

            image = (ImageFile)item.Transfer(WIA.FormatID.wiaFormatPNG);
        }

This means that scanned document will be size A4 with dimensions 629 x 876.