Pos58打印程序开发相关

打印机口lpt和com口可以用kernel32.dll中的读写文件的办法，所用接口如下：

StructLayout(LayoutKind.Sequential)]
private struct OVERLAPPED
{
int Internal;
int InternalHigh;
int Offset;
int OffSetHigh;
int hEvent;
}

[DllImport("kernel32.dll")]
private static extern int CreateFile(string lpFileName, uint dwDesiredAccess, int dwShareMode, int lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, int hTemplateFile);
[DllImport("kernel32.dll")]
private static extern bool WriteFile(int hFile, byte[] lpBuffer, int nNumberOfBytesToWrite, ref int lpNumberOfBytesWritten, ref OVERLAPPED lpOverlapped);
[DllImport("kernel32.dll")]
private static extern bool CloseHandle(int hObject);

public bool Write(byte[] mybyte)

{

iHandle = CreateFile(_linkStr, 0x40000000, 0, 0, 3, 0, 0);

//如果端口为打开，则提示，打开，则打印
if (iHandle != -1)
{
OVERLAPPED x = new OVERLAPPED();
int i = 0;
bool result = WriteFile(iHandle, mybyte, mybyte.Length, ref i, ref x);
return result;
}

}

如果是USB类型的需要用winspool.Drv的接口

#region Declaration Dll

[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi,
ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter,
IntPtr pd);

[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool ClosePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi,
ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool StartDocPrinter(IntPtr hPrinter, int level,
[In] [MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

[DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool EndDocPrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool StartPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool EndPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, int dwCount, out int dwWritten);

#endregion
具体代码如下：

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace ccss
{
internal class RawPrinterHelper
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class DOCINFOA
{
[MarshalAs(UnmanagedType.LPStr)] public string pDocName;
[MarshalAs(UnmanagedType.LPStr)] public string pOutputFile;
[MarshalAs(UnmanagedType.LPStr)] public string pDataType;
}

#region Declaration Dll

#endregion

#region Methods

// SendBytesToPrinter()
// When the function is given a printer name and an unmanaged array
// of bytes, the function sends those bytes to the printer queue.
// Returns true on success, false on failure.
public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, int dwCount)
{
int dwError = 0, dwWritten = 0;
var hPrinter = new IntPtr(0);
var di = new DOCINFOA();
var bSuccess = false; // Assume failure unless you specifically succeed.

di.pDocName = "VIP RAW PrinterDocument";
di.pDataType = "RAW";

// Open the printer.
if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
{
// Start a document.
if (StartDocPrinter(hPrinter, 1, di))
{
// Start a page.
if (StartPagePrinter(hPrinter))
{
// Write your bytes.
bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
EndPagePrinter(hPrinter);
}
EndDocPrinter(hPrinter);
}
ClosePrinter(hPrinter);
}
// If you did not succeed, GetLastError may give more information
// about why not.
if (bSuccess == false)
dwError = Marshal.GetLastWin32Error();

return bSuccess;
}

public static bool SendFileToPrinter(string szPrinterName, string szFileName)
{
// Open the file.
var fs = new FileStream(szFileName, FileMode.Open);

// Create a BinaryReader on the file.
var br = new BinaryReader(fs);

// Dim an array of bytes big enough to hold the file's contents.
var bytes = new byte[fs.Length];
var bSuccess = false;

// Your unmanaged pointer.
var pUnmanagedBytes = new IntPtr(0);
var nLength = Convert.ToInt32(fs.Length);

// Read the contents of the file into the array.
bytes = br.ReadBytes(nLength);
// Allocate some unmanaged memory for those bytes.
pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);
// Copy the managed byte array into the unmanaged array.
Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);
// Send the unmanaged bytes to the printer.
bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength);
// Free the unmanaged memory that you allocated earlier.
Marshal.FreeCoTaskMem(pUnmanagedBytes);
return bSuccess;
}

public static bool SendBytesToPrinter(string szPrinterName, byte[] data)
{
var pUnmanagedBytes = Marshal.AllocCoTaskMem(data.Length); // Allocate unmanaged memory
Marshal.Copy(data, 0, pUnmanagedBytes, data.Length); // copy bytes into unmanaged memory
var retval = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, data.Length);
Marshal.FreeCoTaskMem(pUnmanagedBytes); // Free the allocated unmanaged memory

return retval;
}

public static bool SendStringToPrinter(string szPrinterName, string szString)
{
// How many characters are in the string?
var dwCount = szString.Length;

// Assume that the printer is expecting ANSI text, and then convert
// the string to ANSI text.
var pBytes = Marshal.StringToCoTaskMemAnsi(szString);

// Send the converted ANSI string to the printer.
var result = SendBytesToPrinter(szPrinterName, pBytes, dwCount);
Marshal.FreeCoTaskMem(pBytes);

return result;
}

//if you want a wrapper function for you strings :
public static bool SendAsciiToPrinter(string szPrinterName, string data)
{
var retval = false;

//if you are using UTF-8 and get wrong values in qrcode printing, you must use ASCII instead.
//retval = SendBytesToPrinter(szPrinterName, Encoding.UTF8.GetBytes(data));
retval = SendBytesToPrinter(szPrinterName, Encoding.ASCII.GetBytes(data));

return retval;
}

#endregion
}
}

void test(string szPrinterName, byte[] data)

{

RawPrinterHelper.SendBytesToPrinter(szPrinterName, data);

}

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