我们目前已经购买了计算程序等，但我们不允许双面打印。但我们真正的打印机确实支持它。
我想询问是否可以在应用程序和真实打印机之间设置“打印机驱动程序”，我也可以发送文件。在这个驱动程序中，我说它应该以双面打印。
我目前只使用C＃和.NET进行编程，而且我从来没有进一步使用c ++或c
你可以给我一些提示来开始吗？
答案 0 :(得分：3)
双工类来自微软文档，忘记了实际链接 附件供您使用，
ushort[2] --> 0 0 1 0关于函数使用的示例
using System.Runtime.InteropServices;
using System;
namespace STACK.OVERFLOW
{
public class Duplexprint
{
#region Win32 API Declaration
[DllImport("kernel32.dll", EntryPoint = "GetLastError", SetLastError = false, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern Int32 GetLastError();
[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool ClosePrinter(IntPtr hPrinter);
[DllImport("winspool.Drv", EntryPoint = "DocumentPropertiesA", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern int DocumentProperties(IntPtr hwnd, IntPtr hPrinter, [MarshalAs(UnmanagedType.LPStr)]
string pDeviceNameg, IntPtr pDevModeOutput, IntPtr pDevModeInput, int fMode);
[DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool GetPrinter(IntPtr hPrinter, Int32 dwLevel, IntPtr pPrinter, Int32 dwBuf, ref Int32 dwNeeded);
[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
static extern int OpenPrinter(string pPrinterName, out IntPtr phPrinter, ref PRINTER_DEFAULTS pDefault);
[DllImport("winspool.Drv", EntryPoint = "SetPrinterA", ExactSpelling = true, SetLastError = true)]
public static extern bool SetPrinter(IntPtr hPrinter, int Level, IntPtr pPrinter, int Command);
[StructLayout(LayoutKind.Sequential)]
public struct PRINTER_DEFAULTS
{
public IntPtr pDatatype;
public IntPtr pDevMode;
public int DesiredAccess;
}
[StructLayout(LayoutKind.Sequential)]
public struct PRINTER_INFO_9
{
public IntPtr pDevMode;
// Pointer to SECURITY_DESCRIPTOR
public int pSecurityDescriptor;
}
public const short CCDEVICENAME = 32;
public const short CCFORMNAME = 32;
[StructLayout(LayoutKind.Sequential)]
public struct DEVMODE
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCDEVICENAME)]
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 = CCFORMNAME)]
public string dmFormName;
public short dmUnusedPadding;
public short dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmDisplayFlags;
public int dmDisplayFrequency;
}
public const Int64 DM_DUPLEX = 0x1000L;
public const Int64 DM_ORIENTATION = 0x1L;
public const Int64 DM_SCALE = 0x10L;
public const Int64 DMORIENT_PORTRAIT = 0x1L;
public const Int64 DMORIENT_LANDSCAPE = 0x2L;
public const Int32 DM_MODIFY = 8;
public const Int32 DM_COPY = 2;
public const Int32 DM_IN_BUFFER = 8;
public const Int32 DM_OUT_BUFFER = 2;
public const Int32 PRINTER_ACCESS_ADMINISTER = 0x4;
public const Int32 PRINTER_ACCESS_USE = 0x8;
public const Int32 STANDARD_RIGHTS_REQUIRED = 0xf0000;
public const int PRINTER_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED | PRINTER_ACCESS_ADMINISTER | PRINTER_ACCESS_USE);
//added this
public const int CCHDEVICENAME = 32;
//added this
public const int CCHFORMNAME = 32;
#endregion
#region Public Methods
/// <summary>
/// Method Name : GetPrinterDuplex
/// Programmatically get the Duplex flag for the specified printer
/// driver's default properties.
/// </summary>
/// <param name="sPrinterName"> The name of the printer to be used. </param>
/// <param name="errorMessage"> this will contain error messsage if any. </param>
/// <returns>
/// nDuplexSetting - One of the following standard settings:
/// 0 = Error
/// 1 = None (Simplex)
/// 2 = Duplex on long edge (book)
/// 3 = Duplex on short edge (legal)
/// </returns>
/// <remarks>
/// </remarks>
public short GetPrinterDuplex(string sPrinterName, out string errorMessage)
{
errorMessage = string.Empty;
short functionReturnValue = 0;
IntPtr hPrinter = default(IntPtr);
PRINTER_DEFAULTS pd = default(PRINTER_DEFAULTS);
DEVMODE dm = new DEVMODE();
int nRet = 0;
pd.DesiredAccess = PRINTER_ACCESS_USE;
nRet = OpenPrinter(sPrinterName, out hPrinter, ref pd);
if ((nRet == 0) | (hPrinter.ToInt32() == 0))
{
if (GetLastError() == 5)
{
errorMessage = "Access denied -- See the article for more info.";
}
else
{
errorMessage = "Cannot open the printer specified " + "(make sure the printer name is correct).";
}
return functionReturnValue;
}
nRet = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, IntPtr.Zero, IntPtr.Zero, 0);
if ((nRet < 0))
{
errorMessage = "Cannot get the size of the DEVMODE structure.";
goto cleanup;
}
IntPtr iparg = Marshal.AllocCoTaskMem(nRet + 100);
nRet = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, iparg, IntPtr.Zero, DM_OUT_BUFFER);
if ((nRet < 0))
{
errorMessage = "Cannot get the DEVMODE structure.";
goto cleanup;
}
dm = (DEVMODE)Marshal.PtrToStructure(iparg, dm.GetType());
if (!Convert.ToBoolean(dm.dmFields & DM_DUPLEX))
{
errorMessage = "You cannot modify the duplex flag for this printer " + "because it does not support duplex or the driver " + "does not support setting it from the Windows API.";
goto cleanup;
}
functionReturnValue = dm.dmDuplex;
cleanup:
if ((hPrinter.ToInt32() != 0))
ClosePrinter(hPrinter);
return functionReturnValue;
}
/// <summary>
/// Method Name : SetPrinterDuplex
/// Programmatically set the Duplex flag for the specified printer driver's default properties.
/// </summary>
/// <param name="sPrinterName"> sPrinterName - The name of the printer to be used. </param>
/// <param name="nDuplexSetting">
/// nDuplexSetting - One of the following standard settings:
/// 1 = None
/// 2 = Duplex on long edge (book)
/// 3 = Duplex on short edge (legal)
/// </param>
/// <param name="errorMessage"> this will contain error messsage if any. </param>
/// <returns>
/// Returns: True on success, False on error.
/// </returns>
/// <remarks>
///
/// </remarks>
public bool SetPrinterDuplex(string sPrinterName, int nDuplexSetting, out string errorMessage)
{
errorMessage = string.Empty;
bool functionReturnValue = false;
IntPtr hPrinter = default(IntPtr);
PRINTER_DEFAULTS pd = default(PRINTER_DEFAULTS);
PRINTER_INFO_9 pinfo = new PRINTER_INFO_9();
DEVMODE dm = new DEVMODE();
IntPtr ptrPrinterInfo = default(IntPtr);
int nBytesNeeded = 0;
int nRet = 0;
Int32 nJunk = default(Int32);
if ((nDuplexSetting < 1) | (nDuplexSetting > 3))
{
errorMessage = "Error: dwDuplexSetting is incorrect.";
return functionReturnValue;
}
pd.DesiredAccess = PRINTER_ACCESS_USE;
nRet = OpenPrinter(sPrinterName, out hPrinter, ref pd);
if ((nRet == 0) | (hPrinter.ToInt32() == 0))
{
if (GetLastError() == 5)
{
errorMessage = "Access denied -- See the article for more info.";
}
else
{
errorMessage = "Cannot open the printer specified " + "(make sure the printer name is correct).";
}
return functionReturnValue;
}
nRet = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, IntPtr.Zero, IntPtr.Zero, 0);
if ((nRet < 0))
{
errorMessage = "Cannot get the size of the DEVMODE structure.";
goto cleanup;
}
IntPtr iparg = Marshal.AllocCoTaskMem(nRet + 100);
nRet = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, iparg, IntPtr.Zero, DM_OUT_BUFFER);
if ((nRet < 0))
{
errorMessage = "Cannot get the DEVMODE structure.";
goto cleanup;
}
dm = (DEVMODE)Marshal.PtrToStructure(iparg, dm.GetType());
if (!Convert.ToBoolean(dm.dmFields & DM_DUPLEX))
{
errorMessage = "You cannot modify the duplex flag for this printer " + "because it does not support duplex or the driver " + "does not support setting it from the Windows API.";
goto cleanup;
}
dm.dmDuplex = (short)nDuplexSetting;
Marshal.StructureToPtr(dm, iparg, true);
nRet = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, pinfo.pDevMode, pinfo.pDevMode, DM_IN_BUFFER | DM_OUT_BUFFER);
if ((nRet < 0))
{
errorMessage = "Unable to set duplex setting to this printer.";
goto cleanup;
}
GetPrinter(hPrinter, 9, IntPtr.Zero, 0, ref nBytesNeeded);
if ((nBytesNeeded == 0))
{
errorMessage = "GetPrinter failed.";
goto cleanup;
}
ptrPrinterInfo = Marshal.AllocCoTaskMem(nBytesNeeded + 100);
nRet = GetPrinter(hPrinter, 9, ptrPrinterInfo, nBytesNeeded, ref nJunk) ? 1 : 0;
if ((nRet == 0))
{
errorMessage = "Unable to get shared printer settings.";
goto cleanup;
}
pinfo = (PRINTER_INFO_9)Marshal.PtrToStructure(ptrPrinterInfo, pinfo.GetType());
pinfo.pDevMode = iparg;
pinfo.pSecurityDescriptor = 0;
Marshal.StructureToPtr(pinfo, ptrPrinterInfo, true);
nRet = SetPrinter(hPrinter, 9, ptrPrinterInfo, 0) ? 1 : 0;
if ((nRet == 0))
{
errorMessage = "Unable to set shared printer settings.";
}
functionReturnValue = Convert.ToBoolean(nRet);
cleanup:
if ((hPrinter.ToInt32() != 0))
ClosePrinter(hPrinter);
return functionReturnValue;
}
#endregion
}
}