我可以从C#更改分辨率dpi吗 [英] can i chang resolution dpi from c#

问题描述

我想在dpi扫描仪选项中加载int数据库字段，如何从c#中访问它

http://imageshack.us/photo/my-images/811/62695829.png/ [ ^ ]

i want to load int database field in dpi scanner option how to access it from c#

http://imageshack.us/photo/my-images/811/62695829.png/[^]

推荐答案

您想将扫描仪使用的DPI存储在数据库中吗?它只是一个整数，存储起来很容易.设置它是困难的. C#中没有TWAIN支持，而WIA支持有限，因此，这取决于您的扫描代码是否可以访问DPI设置.

我使用Google找到了此代码.你应该试试看.

You want to store the DPI used by your scanner in your db ? It''s just an int, storing it is easy. Setting it is the hard bit. There''s no TWAIN support in C#, and limited WIA support, so, it depends on if your scanning code has access to DPI settings.

I found this code using google. You should try it.

   private void setItem(IItem item, object property, object value)
       {
           WIA.Property aProperty = item.Properties.get_Item(ref property);
           aProperty.set_Value(ref value);
       }



       internal bool Scan(bool flatBed)
       {

           WIA.DeviceManager manager = new DeviceManager();
           bool result = false;
           object something = 1;
           object somethingElse;
           WIA.Device scanner = manager.DeviceInfos.get_Item(ref something).Connect();
           IItem item = scanner.Items[1];

           setItem(item, "6146", 4);
           setItem(item, "6147", 200);
           setItem(item, "6148", 200);
           setItem(item, "6151", 200 * 8.5);
           setItem(item, "6152", 200 * 11);
}

第一个setItem是颜色[4个黑白，2个灰度，1个颜色，0个未指定]

第二个是水平分辨率.

第三是纵向分辨率.

第四个是水平扫描区域.

第五个是垂直扫描区域.

The first setItem is the color [4 black and white, 2 grayscale, 1 color, 0 unspecified]

The second is horizontal resolution.

The third is veritcal resolution.

The fourth is horizontal scanning area.

The fifth is vertical scanning area.

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