[C #] Getting the printer list,
I. Obtain the list of locally installed printers
Note: (if you have added a LAN printer to the device and printer, it is also a locally installed printer. If you have not added a LAN printer, It is counted as a LAN printer)
1. Get the result through the PrinterSettings object in C #, as shown below, and then traverse the printers through foreach;
PrinterSettings. StringCollection printers = System. Drawing. Printing. PrinterSettings. InstalledPrinters;
2. For the PrintHelper class and the GetEnumPrinters2 method, see the last part of the article;
1 PRINTER_INFO_2 [] printers = PrintHelper. GetEnumPrinters2 (); 2 foreach (PRINTER_INFO_2 printer in printers) 3 {4 listBox1.Items. Add (printer. pPrinterName); 5}View Code
3. Use ManagementObjectCollection (System. Management reference must be added) to query the printer list on the local computer;
1 // get the local printer List 2 ManagementObjectCollection queryCollection; 3 string SQL = "SELECT * FROM Win32_Printer"; 4 Dictionary <string, ManagementObject> dict = new Dictionary <string, managementObject> (); 5 ManagementObjectSearcher query = new ManagementObjectSearcher (SQL); 6 queryCollection = query. get (); 7 foreach (ManagementObject mo in queryCollection) 8 {9 string oldName = mo ["Name"]. toString (); 10 listBox1.Items. add (oldName); 11}View Code 2: Obtain the LAN printer list
1. For the PrintHelper class and the GetEnumPrinters2 method, see the last part of the article;
1 PRINTER_INFO_1 [] printers = PrintHelper. GetEnumPrinters (); 2 foreach (PRINTER_INFO_1 printer in printers) 3 {4 if (-1 = printer. pName. IndexOf ("!! ") 5 {6 listBox1.Items. add (printer. pName); 7} 8 else 9 {10 uint restart needed = 0; 11 uint pcReturned = 0; 12 IntPtr pPrInfo4 = IntPtr. zero; 13 uint size = 0; 14 string pNewName = printer. pName; 15 PrintHelper. enumPrinters (PrinterEnumFlags. PRINTER_ENUM_NAME, pNewName, 1, IntPtr. zero, size, ref joined needed, ref pcReturned); 16 if (joined needed! = 0) 17 {18 pPrInfo4 = Marshal. allocHGlobal (int) returns needed); 19 size = bytes needed; 20 PrintHelper. enumPrinters (PrinterEnumFlags. PRINTER_ENUM_NAME, pNewName, 1, pPrInfo4, size, ref required needed, ref pcReturned); 21 PRINTER_INFO_1 [] printerInfo1 = new PRINTER_INFO_1 [pcReturned]; 22 int offset = ignore (); 23 Type type = typeof (PRINTER_INFO_1); 24 int increment = Marshal. sizeOf (type); 25 for (int I = 0; I <pcReturned; I ++) 26 {27 printerInfo1 [I] = (PRINTER_INFO_1) Marshal. ptrToStructure (new IntPtr (offset), type); 28 offset + = increment; 29 listBox1.Items. add (printerInfo1 [I]. pName); 30} 31 Marshal. freeHGlobal (pPrInfo4); 32} 33} 34}View Code
PrintHelper class and related enumeration and information class definitions
1 public class PrintHelper 2 {3 [DllImport ("winspool. drv ", CharSet = CharSet. auto, SetLastError = true)] 4 [return: financialas (UnmanagedType. bool)] 5 public static extern bool EnumPrinters (PrinterEnumFlags Flags, string Name, uint Level, IntPtr pPrinterEnum, uint cbBuff, ref uint cannot needed, ref uint pcReturned ); 6 7 // get the Network Printer 8 public static PRINTER_INFO_1 [] GetEnumPrinters (PrinterEnumFlags flags) 9 {10 PRINTER_INFO_1 [] printerInfo1 = new PRINTER_INFO_1 [] {}; 11 uint restart needed = 0; 12 uint pcReturned = 0; 13 IntPtr pPrInfo4 = IntPtr. zero; 14 uint size = 0; 15 if (EnumPrinters (flags, null, 1, IntPtr. zero, size, ref required needed, ref pcReturned) 16 {17 return printerInfo1; 18} 19 if (required needed! = 0) 20 {21 pPrInfo4 = Marshal. allocHGlobal (int) effecneeded); 22 size = effecneeded; 23 EnumPrinters (flags, null, 1, pPrInfo4, size, ref effecneeded, ref pcReturned); 24 if (pcReturned! = 0) 25 {26 printerInfo1 = new PRINTER_INFO_1 [pcReturned]; 27 int offset = pPrInfo4.ToInt32 (); 28 Type = typeof (PRINTER_INFO_1); 29 int increment = Marshal. sizeOf (type); 30 for (int I = 0; I <pcReturned; I ++) 31 {32 printerInfo1 [I] = (PRINTER_INFO_1) Marshal. ptrToStructure (new IntPtr (offset), type); 33 offset + = increment; 34} 35 destination Al. freeHGlobal (pPrInfo4); 36} 37} 38 39 return printerInfo1; 40} 41 4 2 // obtain the local printer 43 public static PRINTER_INFO_2 [] GetEnumPrinters2 () 44 {45 PRINTER_INFO_2 [] printerInfo2 = new PRINTER_INFO_2 [] {}; 46 uint required needed = 0; 47 uint pcReturned = 0; 48 IntPtr pPrInfo4 = IntPtr. zero; 49 if (EnumPrinters (PrinterEnumFlags. PRINTER_ENUM_LOCAL, null, 2, IntPtr. zero, 0, ref required needed, ref pcReturned) 50 {51 return printerInfo2; 52} 53 if (required needed! = 0) 54 {55 pPrInfo4 = Marshal. allocHGlobal (int) has needed); 56 EnumPrinters (PrinterEnumFlags. PRINTER_ENUM_LOCAL, null, 2, pPrInfo4, incluneeded, ref incluneeded, ref pcReturned); 57 if (pcReturned! = 0) 58 {59 printerInfo2 = new PRINTER_INFO_2 [pcReturned]; 60 int offset = pPrInfo4.ToInt32 (); 61 for (int I = 0; I <pcReturned; I ++) 62 {63 printerInfo2 [I] = (PRINTER_INFO_2) Marshal. ptrToStructure (new IntPtr (offset), typeof (PRINTER_INFO_2); 64 offset + = Marshal. sizeOf (typeof (PRINTER_INFO_2); 65} 66 Marshal. freeHGlobal (pPrInfo4); 67} 68} 69 70 return printerInfo2; 71} 72}PrintHelper 1 [FlagsAttribute] 2 public enum PrinterEnumFlags 3 {4 PRINTER_ENUM_DEFAULT = 0x00000001, 5 PRINTER_ENUM_LOCAL = 0x00000002, 6 rows = 0x00000004, 7 rows = 0x00000004, 8 PRINTER_ENUM_NAME = 0x00000008, 9 records = 0x00000010,10 records = 0x00000020,11 records = 0x00000040,12 records = 0x00004000,13 records = 0x00008000,14 records = 00ff0000, 15 records = 0x000133, 16 records = 0x00020000,17 records = 0x00040000,18 records = 0x00080000,19 records = 0x00100000,20 records = 0x00200000,21 records = 0x00400000,22 records = 0 x 0100000024, 23 PRINTER_ENUM_HIDE = 0 x}PrinterEnumFlags 1 [StructLayout (LayoutKind. sequential, CharSet = CharSet. auto)] 2 public struct PRINTER_INFO_1 3 {4 int flags; 5 [financialas (UnmanagedType. LPTStr)] 6 public string pDescription; 7 [financialas (UnmanagedType. LPTStr)] 8 public string pName; 9 [financialas (UnmanagedType. LPTStr)] 10 public string pComment; 11}PRINTER_INFO_1 1 [StructLayout (LayoutKind. sequential)] 2 public struct PRINTER_INFO_2 3 {4 [financialas (UnmanagedType. LPTStr)] 5 public string pServerName; 6 [financialas (UnmanagedType. LPTStr)] 7 public string pPrinterName; 8 [financialas (UnmanagedType. LPTStr)] 9 public string pShareName; 10 [financialas (UnmanagedType. LPTStr)] 11 public string pPortName; 12 [financialas (UnmanagedType. LPTStr)] 13 public string pDriverName; 14 [financialas (UnmanagedType. LPTStr)] 15 public string pComment; 16 [financialas (UnmanagedType. LPTStr)] 17 public string pLocation; 18 public IntPtr pDevMode; 19 [financialas (UnmanagedType. LPTStr)] 20 public string jsonpfile; 21 [exploralas (UnmanagedType. LPTStr)] 22 public string pPrintProcessor; 23 [financialas (UnmanagedType. LPTStr)] 24 public string pDatatype; 25 [financialas (UnmanagedType. LPTStr)] 26 public string pParameters; 27 public IntPtr pSecurityDescriptor; 28 public uint Attributes; 29 public uint Priority; 30 public uint DefaultPriority; 31 public uint StartTime; 32 public uint UntilTime; 33 public uint Status; 34 public uint cJobs; 35 public uint AveragePPM; 36}PRINTER_INFO_2
References:
Http://www.pinvoke.net/default.aspx/winspool.EnumPrinters
Https://msdn.microsoft.com/en-us/library/windows/desktop/dd162692 (v = vs.85). aspx
