水晶报表攻克系列3如何在程序中自定义纸张

水晶报表攻克系列3-如何在程序中自定义纸张

　　大家都知道电脑里会有预定义好的纸张，例如A4。但是最近做发票，快递单时，纸张大小需要自定义。

　　例如：

    ReportDocument doc = new ReportDocument();
    doc.PrintOptions.PaperSize = CrystalDecisions.Shared.PaperSize.PaperA4;

　　CrystalDecisions.Shared.PaperSize查看定义可知，是一个枚举类，里面只有41种预定义的纸张类型。而且，doc.PrintOptions.PaperSize不可以自定义纸张的宽和高。

　　

　　经过查阅资料，有一种比较好的办法：

　　1） 在开始菜单，“打印机和传真”=》文件菜单项，服务器属性中，添加自定义纸张，设置自定义纸张的名称。

　　2） 在程序中就可以通过获取该自定义纸张的id，来设置PaperSize，程序如下：

　　

        doc.PrintOptions.PaperSize = (CrystalDecisions.Shared.PaperSize)(GetSelectedPaperSizeId());

        /// <summary>
        /// 获取用户自定义纸张ID
        /// </summary>
        public int GetSelectedPaperSizeId()
        {
            string printer = "";
            string printerName = PrinterSetting.PostPrinterName;
            string paperName = PrinterSetting.PostPrinterUserPaperSize;
            foreach (string printerItem in System.Drawing.Printing.PrinterSettings.InstalledPrinters)
            {
                if (printerItem.Contains(printerName))
                {
                    printer = printerItem;
                }
            }
            Microsoft.Win32.RegistryKey rk;
            if (!printer.StartsWith(@"\\"))        //本地打印机
            {
                rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\" + printer + "\\DsDriver");
            }
            else                                //网络打印机
            {

                string[] p = printer.Remove(0, 2).Split(new char[] { '\\' });
                string path = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Providers\\LanMan Print Services\\Servers\\" + p[0] + "\\Printers\\" + p[1] + "\\DsDriver";
                rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(path);
            }

            string[] papers = (string[])(rk.GetValue("printMediaSupported"));
            int index = 0;
            int paperid = 0;
            foreach (string paper in papers)
            {
                if (paper == paperName)
                {
                    paperid = index;
                }
                index++;
            }

            int[] sizes = PrinterHelper.Get_PaperSizes(printerName);
            int paperSizeid = sizes[paperid];
            return paperSizeid;
        }

　　其中PrinterHelper类如下：

　　

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Gasgoo.Invoice.Common
{
    public class PrinterHelper
    {
        public static string OutputPort = String.Empty;

        [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern int DeviceCapabilities(string pDevice, string pPort, short fwCapabilities, IntPtr pOutput, IntPtr pDevMode);

        public static int[] Get_PaperSizes(string printer)
        {
            string text1 = printer;
            int num1 = FastDeviceCapabilities(0x10, IntPtr.Zero, -1, text1);
            if (num1 == -1)
            {
                return new int[0];
            }
            int num2 = Marshal.SystemDefaultCharSize * 0x40;
            IntPtr ptr1 = Marshal.AllocCoTaskMem(num2 * num1);
            FastDeviceCapabilities(0x10, ptr1, -1, text1);
            IntPtr ptr2 = Marshal.AllocCoTaskMem(2 * num1);
            FastDeviceCapabilities(2, ptr2, -1, text1);
            IntPtr ptr3 = Marshal.AllocCoTaskMem(8 * num1);
            FastDeviceCapabilities(3, ptr3, -1, text1);
            int[] sizeArray1 = new int[num1];
            for (int num3 = 0; num3 < num1; num3++)
            {
                string text2 = Marshal.PtrToStringAuto((IntPtr)(((long)ptr1) + (num2 * num3)), 0x40);
                int num4 = text2.IndexOf('\0');
                if (num4 > -1)
                {
                    text2 = text2.Substring(0, num4);
                }
                short num5 = Marshal.ReadInt16((IntPtr)(((long)ptr2) + (num3 * 2)));
                int num6 = Marshal.ReadInt32((IntPtr)(((long)ptr3) + (num3 * 8)));
                int num7 = Marshal.ReadInt32((IntPtr)((((long)ptr3) + (num3 * 8)) + 4));
                sizeArray1[num3] = System.Convert.ToInt32(num5);
            }
            Marshal.FreeCoTaskMem(ptr1);
            Marshal.FreeCoTaskMem(ptr2);
            Marshal.FreeCoTaskMem(ptr3);
            return sizeArray1;
        }

        private static int FastDeviceCapabilities(short capability, IntPtr pointerToBuffer, int defaultValue, string printerName)
        {
            int num1 = DeviceCapabilities(printerName, OutputPort, capability, pointerToBuffer, IntPtr.Zero);
            if (num1 == -1)
            {
                return defaultValue;
            }
            return num1;
        }
    }
}

　　这样，就可以完整的获取用户自定义的纸张了。

　　下一节，会为大家分享如何使用子报表。