Re: Escape sequence to dotmatrix printer - Escape() API
From: Glenn Wilson (ircomm_at_hotemail.com)
Date: 08/03/04
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Date: Tue, 3 Aug 2004 20:24:07 +1000
We used to add chr(27) to the text to represent the escape character. adding
chr(27)+"R" + <Rest of string>
BTW: I Think it is CHR(27) Look at the ANSII Character Codes, It has been a
While but we used to use them in Linux based MUDS to transmit Color codes
and Cursor movements to ANSI Terminals.
Glenn
"Funbeat" <funbeat@netcourrier.com> wrote in message
news:59f69652.0408030025.fc0b3b7@posting.google.com...
> Hello everybody,
>
>
> I'm using a dotmatrix printer (EPSON LX-300+) in order to print line
> by line.
> Starting from the MSDN Article #322091 "HOW TO: Send Raw Data to a
> Printer by Using Visual C# .NET"
> (http://support.microsoft.com/default.aspx?scid=kb;EN-US;322091),
> all is fine till there ;
>
> I'm trying to configure the printer to choose the character set (I'm
> French).
> By means of the printer user guide, I identified the sequence : ESC R
> 1
>
> I'm facing with the following problem :
>
> To send an escape sequence, 2 functions (APIs) are necessary :
> - CreateDC(), to obtain a device context of the printer ;
> - Escape(), to send the sequence using the DC.
>
> I always have the same error with Escape() : "Descripteur non valide"
> / "Invalid Descriptor" and a return value of zero.
> I have tried with other sequence (bold, italic...) with no success.
>
>
> Any ideas ?
>
> Any help will be appreciated.
> Thanks in advance.
>
> Jean-Louis.
>
> Here is the code (some is omitted for clearness) :
> --------------
> .
> .
> .
> [DllImport("gdi32.dll", EntryPoint="Escape", SetLastError=true,
> ExactSpelling=true, CallingConvention=CallingConvention.StdCall)]
> public static extern long Escape(long hdc, long nEscape, long nCount,
> string lpInData, object lpOutData);
>
> [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
> internal struct structDevMode
> {
> [MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)] public String
> dmDeviceName;
> [MarshalAs(UnmanagedType.U2)] public short dmSpecVersion;
> [MarshalAs(UnmanagedType.U2)] public short dmDriverVersion;
> [MarshalAs(UnmanagedType.U2)] public short dmSize;
> [MarshalAs(UnmanagedType.U2)] public short dmDriverExtra;
> [MarshalAs(UnmanagedType.U4)] public int dmFields;
> [MarshalAs(UnmanagedType.I2)] public short dmOrientation;
> [MarshalAs(UnmanagedType.I2)] public short dmPaperSize;
> [MarshalAs(UnmanagedType.I2)] public short dmPaperLength;
> [MarshalAs(UnmanagedType.I2)] public short dmPaperWidth;
> [MarshalAs(UnmanagedType.I2)] public short dmScale;
> [MarshalAs(UnmanagedType.I2)] public short dmCopies;
> [MarshalAs(UnmanagedType.I2)] public short dmDefaultSource;
> [MarshalAs(UnmanagedType.I2)] public short dmPrintQuality;
> [MarshalAs(UnmanagedType.I2)] public short dmColor;
> [MarshalAs(UnmanagedType.I2)] public short dmDuplex;
> [MarshalAs(UnmanagedType.I2)] public short dmYResolution;
> [MarshalAs(UnmanagedType.I2)] public short dmTTOption;
> [MarshalAs(UnmanagedType.I2)] public short dmCollate;
> [MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)] public String
> dmFormName;
> [MarshalAs(UnmanagedType.U2)] public short dmLogPixels;
> [MarshalAs(UnmanagedType.U4)] public int dmBitsPerPel;
> [MarshalAs(UnmanagedType.U4)] public int dmPelsWidth;
> [MarshalAs(UnmanagedType.U4)] public int dmPelsHeight;
> [MarshalAs(UnmanagedType.U4)] public int dmNup;
> [MarshalAs(UnmanagedType.U4)] public int dmDisplayFrequency;
> [MarshalAs(UnmanagedType.U4)] public int dmICMMethod;
> [MarshalAs(UnmanagedType.U4)] public int dmICMIntent;
> [MarshalAs(UnmanagedType.U4)] public int dmMediaType;
> [MarshalAs(UnmanagedType.U4)] public int dmDitherType;
> [MarshalAs(UnmanagedType.U4)] public int dmReserved1;
> [MarshalAs(UnmanagedType.U4)] public int dmReserved2;
> }
>
> [DllImport("GDI32.dll", EntryPoint="CreateDC", SetLastError=true,
> CharSet=CharSet.Unicode, ExactSpelling=false,
> CallingConvention=CallingConvention.StdCall)]
> internal static extern long CreateDC([MarshalAs(UnmanagedType.LPTStr)]
> string pDrive,
> [MarshalAs(UnmanagedType.LPTStr)] string pName,
> [MarshalAs(UnmanagedType.LPTStr)] string pOutput,
> ref structDevMode pDevMode);
> .
> .
> .
>
> public static void Init ()
> {
> const long PASSTHROUGH = 19;
> const long NULL = 0;
> long ret;
>
> string escCar = ((char)27).ToString();
> string escString = escCar + "R1";
>
> try
> {
> structDevMode pDevMode = new structDevMode();
> long hdcPrint = CreateDC( "winspool", "EPSON LX", "", ref pDevMode);
> ret = Escape(hdcPrint, PASSTHROUGH, escString.Length, escString,
> NULL);
>
> // ALWAYS true here \/
> if (ret == 0)
> {
> Win32Exception ex = new Win32Exception();
> Console.WriteLine ex.Message;
> }
> }
> catch(Exception _ex)
> {
> Console.WriteLine (_ex);
> }
> }
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