怎么用vb.net获取打印机的分辨率（DPI）？

[gzchen007]

我用英寸为单位设计了几张发票，数据库里存的是需要在发票上打印的数据的位置坐标信息，
我想请问一下，在打印的时候怎么把英寸的坐标转换为以像素为单位的坐标呢？其中要不要用到打印机的分辨率的（DPI 每英寸上的点数）？如果不用，那么在打印的时候怎么在纸张上定位？用到的话，怎么获取那个打印机的DPI？

[xingyuebuyu]

http://zhidao.baidu.com/question/170555603

Dim wmiSQL As String = "SELECT * FROM Win32_Printer WHERE Default=True"
Dim printers As ManagementObjectCollection = New ManagementObjectSearcher(wmiSQL).[Get]()
For Each printer As ManagementObject In printers
MessageBox.Show(printer.Properties("HorizontalResolution").Value.ToString() & " x " & printer.Properties("VerticalResolution").Value.ToString())
Exit For
Next

[wuyq11]

System.Management.ManagementClass mc =new ManagementClass( "Win32_Printer ")
System.Management.ManagementObjectCollection mocs = mc.GetInstances();
foreach(ManagementObject mo in mocs)
{
string DriverName=(mo[ "DriverName "]==null)?string.Empty:mo[ "DriverName "].ToString();
string HorizontalResolution=(mo[ "HorizontalResolution "]==null)?string.Empty:mo[ "HorizontalResolution "].ToString();
string VerticalResolution=(mo[ "VerticalResolution "]==null)?string.Empty:mo[ "VerticalResolution "].ToString();
}