LPT1 列印

參考來源
--

public class PrintFactory
{
public const short FILE_ATTRIBUTE_NORMAL = 0x80;
public const short INVALID_HANDLE_VALUE = -1;
public const uint GENERIC_READ = 0x80000000;
public const uint GENERIC_WRITE = 0x40000000;
public const uint CREATE_NEW = 1;
public const uint CREATE_ALWAYS = 2;
public const uint OPEN_EXISTING = 3;

[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr CreateFile(string lpFileName, uint dwDesiredAccess,
uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition,
uint dwFlagsAndAttributes, IntPtr hTemplateFile);

public static void sendTextToLPT1( String receiptText )
{
IntPtr ptr = CreateFile("LPT1", GENERIC_WRITE, 0,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

/* Is bad handle? INVALID_HANDLE_VALUE */
if (ptr.ToInt32() == -1)
{
/* ask the framework to marshall the win32 error code to an exception */
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
else
{
FileStream lpt = new FileStream(ptr, FileAccess.ReadWrite);
Byte[] buffer = new Byte[2048];
//Check to see if your printer support ASCII encoding or Unicode.
//If unicode is supported, use the following:
//buffer = System.Text.Encoding.Unicode.GetBytes(Temp);
buffer = System.Text.Encoding.ASCII.GetBytes(receiptText);
lpt.Write(buffer, 0, buffer.Length);
lpt.Close();
}
}
}