使用WIA设置页面大小（用扫描仪） [英] Set page size using WIA (with scanner)

问题描述

我使用WIA获得来自用C＃扫描的图像。我可以扫描的文件，但我不能设置页面大小正确，它总是默认为A4，我需要用信函或法律的时候。

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.

我试图与WIA_DPS_PAGE_SIZE属性，但是当我尝试设置的值，我总是得到一个错误，该值在间隔（尝试了很多可能值）。

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).

我wan't到能够使用WIA_DPS_PAGE_SIZE = WIA_PAGE_AUTO（自动页面大小），但我不能在网上找到与此相关的任何东西。

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.

有谁知道一个解决方案吗？谢谢！

Does anyone know a solution? thanks!

推荐答案

我知道这可能是为时已晚，以真正帮助你这一说法，但它有可能成为以备将来参考。要更改扫描的项目属性使用这样的code：

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);
}

这意味着，扫描的文件将是大小 A4 ，尺寸为629 x 876。

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

这篇关于使用WIA设置页面大小（用扫描仪）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！