因为水晶报表的PaperSize是enum类型，但有时客户用的纸张不在其定义范围内，虽然在设计报表时可以选择目的打印机和纸型，但如果重新配置过该打印机则报表默认纸型不再有效，报表将按A4进行预览且会失真。
| //获取本机所有打印机将其名称填充到comboBoxPrinters中：包含本地和网络打印机
foreach(string printer in System.Drawing.Printing.PrinterSettings.InstalledPrinters)
{
this.comboBoxPrinters.Items.Add(printer);
}
//当从comboBoxPrinters中选择打印机时获取其支持的纸张大小将其填充到listBoxPapers
this.listBoxPapers.Items.Clear();
string printer = this.comboBoxPrinters.Text;
this.m_printer = printer;
Microsoft.Win32.RegistryKey rk;
if(!this.comboBoxPrinters.Text.StartsWith(@"\\")) //本地打印机
rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\" + this.comboBoxPrinters.Text + "\\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"));
for(int i=0;i<papers.Length;i++)
{
this.listBoxPapers.Items.Add(papers[i]);
}
//根据纸张名称获取其所在本地机上的PaperSize：调用的是PaperSizeGetter.Get_PaperSizes静态方法（是从水晶报表中reflect精简出来的，版权归原作者所有）
public class PaperSizeGetter
{
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;
}
}
//根据纸型名称在其名称列表中的索引，获取该索引在调用Get_PaperSizes后的size数组中的对应值
int[] sizes = PaperSizeGetter.Get_PaperSizes(printerName);
int paperSizeid = sizes[this.listBoxPapers.SelectedIndex];
//将该size赋值给报表对象
report.PrintOptions.PaperSize = (CrystalDecisions.Shared.PaperSize)(paperSizeid);
|
本地机的每种纸型在每个支持的打印机上都对应了个id值，不同的配置顺序，不同的客户机相同纸型名称对都会导致不同的id,怎么获取这个id是关键，例如本机的
Letter 1
Tabloid 3
Legal 5
A3 8
A4 9
A5 11
B4 119
B5 120
11x17 121
25x25 122 //自定义
PostScript 自定义页面大小 32767
从打印机服务器属性中删除25x25，增加26x26，再增加25x25
Letter 1
Tabloid 3
Legal 5
A3 8
A4 9
A5 11
B4 119
B5 120
11x17 121
26x26 122 //自定义
25x25 123 //自定义
PostScript 自定义页面大小 32767
通过reflect水晶报表的PaperSize属性得知水晶报表通过这个id来设置其纸张大小，所以才想出这么个笨方法暂时解决了客户的要求。
Get_PaperSizes方法，以及这个id真实涵义自己还没弄懂，还请高人指点。
来源：http://blog.chinaunix.net/uid-188267-id-91357.html
