水晶报表

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。