Silverlight5支持PostScript矢量打印，矢量打印相比于位圖打印速度更快，生成的打印文件更小。SL5默認會采用PS矢量打印，如果打印機不支持，自動切換到位圖打印。

雖然微軟SL打印組認為PS已經相當普遍，但我想大多數打印機估計并未安裝支持PostScript的驅動。HP打印機默認的會是PCL的，估計微軟選用PS是學Flash：）

如何用代碼檢測打印機是否支持PostScript呢？代碼如下：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections; using System.Runtime.InteropServices;namespace PrinterSupportPS {class Program{static void Main(string[] args){string printerName = "Microsoft XPS Document Writer";Console.WriteLine(PrinterSupportsPostScript(printerName));Console.Read();}static Int32 GETTECHNOLOGY = 20;static Int32 QUERYESCSUPPORT = 8;static Int32 POSTSCRIPT_PASSTHROUGH = 4115;static Int32 ENCAPSULATED_POSTSCRIPT = 4116;static Int32 POSTSCRIPT_IDENTIFY = 4117;static Int32 POSTSCRIPT_INJECTION = 4118;static Int32 POSTSCRIPT_DATA = 37;static Int32 POSTSCRIPT_IGNORE = 38;[DllImport("gdi32.dll")]static extern int ExtEscape(IntPtr hdc, int nEscape, int cbInput,IntPtr lpszInData, int cbOutput, IntPtr lpszOutData);[DllImport("gdi32.dll")]static extern IntPtr CreateDC(string lpszDriver, string lpszDevice,IntPtr lpszOutput, IntPtr lpInitData);[DllImport("gdi32.dll")]static extern bool DeleteDC(IntPtr hdc);static bool PrinterSupportsPostScript(string printername){ArrayList PSChecks = new ArrayList();PSChecks.Add(POSTSCRIPT_PASSTHROUGH);PSChecks.Add(ENCAPSULATED_POSTSCRIPT);PSChecks.Add(POSTSCRIPT_IDENTIFY);PSChecks.Add(POSTSCRIPT_INJECTION);PSChecks.Add(POSTSCRIPT_DATA);PSChecks.Add(POSTSCRIPT_IGNORE);IntPtr hDC = IntPtr.Zero; ;IntPtr BLOB = IntPtr.Zero;try{hDC = CreateDC(null, printername, IntPtr.Zero, IntPtr.Zero);int isz = 4;BLOB = Marshal.AllocCoTaskMem(isz);Marshal.WriteInt32(BLOB, GETTECHNOLOGY);int test = ExtEscape(hDC, QUERYESCSUPPORT, 4, BLOB, 0, IntPtr.Zero);if (test == 0) return false; // printer driver does not support GETTECHNOLOGY Checks.foreach (Int32 val in PSChecks){Marshal.WriteInt32(BLOB, val);test = ExtEscape(hDC, QUERYESCSUPPORT, isz, BLOB, 0, IntPtr.Zero);if (test != 0) return true; // if any of the checks pass, return true }}catch (Exception ex) { Console.WriteLine(ex); }finally{if (hDC != IntPtr.Zero) DeleteDC(hDC);if (BLOB != IntPtr.Zero) Marshal.Release(BLOB);};return false;}} }

大家可以建一個控制臺程序，用這段代碼檢測一下。

轉載于:https://www.cnblogs.com/slmk/archive/2012/08/26/2657230.html

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