C#：调用API函数，弹出对话框更改打印机默认设置

虽然说.NET为我们提供了很多打印设置的功能，比如PrintDialog。

可是有的功能是没有实现的，比如PrintDialog的窗体中，按下“打印机”后，出来的打印机设置窗口。

会发现，这个打印机设置会根据不同的打印机而不同。

而它更改的，是打印机的默认设置。

 

怎么实现这个功能呢？

这个难题让我在网上寻觅了一个星期。

也没有找到实现这个功能的代码。

要么就是只能弹出这个对话框，不能保存修改。

要么就是只能直接修改设置，不能弹出对话框。

 

经过一番摸索和尝试。我终于得出了以下的一个类。调用这个类唯一的公共方法，ChangePrinterSetting(string PrinterName)，即可以修改相应名字的打印机默认设置。VS2005下调试通过。希望对需要的朋友有所帮助。希望转载的朋友能注明出处。谢谢。

 

using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.ComponentModel;namespace PrinterSetting{ //written by fujie public class PrinterSetting { [StructLayout(LayoutKind.Sequential)] public struct PRINTER_DEFAULTS { public int pDatatype; public int pDevMode; public int DesiredAccess; } [StructLayout(LayoutKind.Sequential)] struct PRINTER_INFO_2 { [MarshalAs(UnmanagedType.LPStr)] public string pServerName; [MarshalAs(UnmanagedType.LPStr)] public string pPrinterName; [MarshalAs(UnmanagedType.LPStr)] public string pShareName; [MarshalAs(UnmanagedType.LPStr)] public string pPortName; [MarshalAs(UnmanagedType.LPStr)] public string pDriverName; [MarshalAs(UnmanagedType.LPStr)] public string pComment; [MarshalAs(UnmanagedType.LPStr)] public string pLocation; public IntPtr pDevMode; [MarshalAs(UnmanagedType.LPStr)] public string pSepFile; [MarshalAs(UnmanagedType.LPStr)] public string pPrintProcessor; [MarshalAs(UnmanagedType.LPStr)] public string pDatatype; [MarshalAs(UnmanagedType.LPStr)] public string pParameters; public IntPtr pSecurityDescriptor; public Int32 Attributes; public Int32 Priority; public Int32 DefaultPriority; public Int32 StartTime; public Int32 UntilTime; public Int32 Status; public Int32 cJobs; public Int32 AveragePPM; } [StructLayout(LayoutKind.Sequential)] public struct DEVMODE { [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] public string dmDeviceName; public short dmSpecVersion; public short dmDriverVersion; public short dmSize; public short dmDriverExtra; public int dmFields; public short dmOrientation; public short dmPaperSize; public short dmPaperLength; public short dmPaperWidth; public short dmScale; public short dmCopies; public short dmDefaultSource; public short dmPrintQuality; public short dmColor; public short dmDuplex; public short dmYResolution; public short dmTTOption; public short dmCollate; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] public string dmFormName; public short dmUnusedPadding; public short dmBitsPerPel; public int dmPelsWidth; public int dmPelsHeight; public int dmDisplayFlags; public int dmDisplayFrequency; } #region ■变量_____________________________________________________________ private IntPtr hPrinter = new System.IntPtr(); private PRINTER_DEFAULTS PrinterValues = new PRINTER_DEFAULTS(); private PRINTER_INFO_2 pinfo = new PRINTER_INFO_2(); private DEVMODE dm; private IntPtr ptrDM; private IntPtr ptrPrinterInfo; private int sizeOfDevMode = 0; private int lastError; private int nBytesNeeded; private long nRet; private int intError; private System.Int32 nJunk; private IntPtr yDevModeData; #endregion #region ■ＡＰＩ___________________________________________________________ [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)] private static extern bool ClosePrinter(IntPtr hPrinter); [DllImport("winspool.Drv", EntryPoint = "DocumentPropertiesA", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)] private static extern int DocumentProperties(IntPtr hwnd, IntPtr hPrinter, [MarshalAs(UnmanagedType.LPStr)] string pDeviceNameg, IntPtr pDevModeOutput, ref IntPtr pDevModeInput, int fMode); [DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)] private static extern bool GetPrinter(IntPtr hPrinter, Int32 dwLevel, IntPtr pPrinter, Int32 dwBuf, out Int32 dwNeeded); [DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)] private static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, ref PRINTER_DEFAULTS pd); [DllImport("winspool.drv", CharSet = CharSet.Ansi, SetLastError = true)] private static extern bool SetPrinter(IntPtr hPrinter, int Level, IntPtr pPrinter, int Command); #endregion #region ■常数_____________________________________________________________ private const int DM_OUT_BUFFER = 2; private const int STANDARD_RIGHTS_REQUIRED = 0xF0000; private const int PRINTER_ACCESS_ADMINISTER = 0x4; private const int PRINTER_ACCESS_USE = 0x8; private const int PRINTER_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED | PRINTER_ACCESS_ADMINISTER | PRINTER_ACCESS_USE); #endregion #region ■方法_____________________________________________________________ public void ChangePrinterSetting(string i_printerName) { DEVMODE dm; IntPtr pPrinter = IntPtr.Zero; IntPtr pDevModeOutput = IntPtr.Zero; IntPtr pDevModeInput = IntPtr.Zero; PrinterValues.pDatatype = 0; PrinterValues.pDevMode = 0; PrinterValues.DesiredAccess = PRINTER_ALL_ACCESS; OpenPrinter(i_printerName, out pPrinter, ref PrinterValues); int iNeeded = DocumentProperties(IntPtr.Zero, pPrinter, i_printerName, pDevModeOutput, ref pDevModeInput, 0); pDevModeOutput = Marshal.AllocHGlobal(iNeeded); int mode = 2 | 4; int nRet = DocumentProperties(IntPtr.Zero, pPrinter, i_printerName, pDevModeOutput, ref pDevModeInput, mode); if (nRet == 1) { dm = (DEVMODE)Marshal.PtrToStructure(pDevModeOutput, typeof(DEVMODE)); ChangePrinterSetting(i_printerName, ref dm); } ClosePrinter(pPrinter); } private void ChangePrinterSetting(string i_printerName, ref DEVMODE i_fujie) { { dm = this.GetPrinterSettings(i_printerName); dm = i_fujie; Marshal.StructureToPtr(dm, yDevModeData, true); pinfo.pDevMode = yDevModeData; pinfo.pSecurityDescriptor = IntPtr.Zero; Marshal.StructureToPtr(pinfo, ptrPrinterInfo, true); lastError = Marshal.GetLastWin32Error(); nRet = Convert.ToInt16(SetPrinter(hPrinter, 2, ptrPrinterInfo, 0)); if (nRet == 0) { lastError = Marshal.GetLastWin32Error(); throw new Win32Exception(Marshal.GetLastWin32Error()); } if (hPrinter != IntPtr.Zero) ClosePrinter(hPrinter); } } private DEVMODE GetPrinterSettings(string i_printerName) { DEVMODE dm; nRet = Convert.ToInt32(OpenPrinter(i_printerName, out hPrinter, ref PrinterValues)); if (nRet == 0) { lastError = Marshal.GetLastWin32Error(); throw new Win32Exception(Marshal.GetLastWin32Error()); } GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out nBytesNeeded); if (nBytesNeeded <= 0) { throw new System.Exception("Unable to allocate memory by fujie"); } else { ptrPrinterInfo = Marshal.AllocHGlobal(nBytesNeeded); nRet = Convert.ToInt32(GetPrinter(hPrinter, 2, ptrPrinterInfo, nBytesNeeded, out nJunk)); if (nRet == 0) { lastError = Marshal.GetLastWin32Error(); throw new Win32Exception(Marshal.GetLastWin32Error()); } pinfo = (PRINTER_INFO_2)Marshal.PtrToStructure(ptrPrinterInfo, typeof(PRINTER_INFO_2)); IntPtr Temp = new IntPtr(); if (pinfo.pDevMode == IntPtr.Zero) { IntPtr ptrZero = IntPtr.Zero; sizeOfDevMode = DocumentProperties(IntPtr.Zero, hPrinter, i_printerName, ptrZero, ref ptrZero, 0); ptrDM = Marshal.AllocCoTaskMem(sizeOfDevMode); int i; i = DocumentProperties(IntPtr.Zero, hPrinter, i_printerName, ptrDM, ref ptrZero, DM_OUT_BUFFER); if ((i < 0) || (ptrDM == IntPtr.Zero)) { throw new System.Exception("fujie:Cannot get DEVMODE data"); } pinfo.pDevMode = ptrDM; } intError = DocumentProperties(IntPtr.Zero, hPrinter, i_printerName, IntPtr.Zero, ref Temp, 0); yDevModeData = Marshal.AllocHGlobal(intError); intError = DocumentProperties(IntPtr.Zero, hPrinter, i_printerName, yDevModeData, ref Temp, 2); dm = (DEVMODE)Marshal.PtrToStructure(yDevModeData, typeof(DEVMODE)); if ((nRet == 0) || (hPrinter == IntPtr.Zero)) { lastError = Marshal.GetLastWin32Error(); throw new Win32Exception(Marshal.GetLastWin32Error()); } return dm; } } #endregion }}