how can i change font size in thermal printing (lipi lwt 150) using C#.net

Question

I am using C#.net and GDI printing code to print to thermal printer LIPI LWT 150. But, I can't change my font size. I'm using Arial 9pt and 5pt, but it comes out in default size. Does anybody have any idea about this?

I am using C# code like this:

 public frmSale()
        {
            InitializeComponent();
            printingDoc.PrintPage += new PrintPageEventHandler(Form_PrintPage);
        }

//initalizing print document
private void PrintSettings()
{

    printingDoc.DefaultPageSettings.Margins = new Margins(3, 3, 3, 3);
    PaperSize pSize = new PaperSize();
    pSize.Width = 275;
    printingDoc.DefaultPageSettings.PaperSize = pSize;

    // Claculating the PageWidth and the PageHeight
    PageHeight = printingDoc.DefaultPageSettings.PaperSize.Height;
    PageWidth = printingDoc.DefaultPageSettings.PaperSize.Width;
    // Claculating the page margins
    LeftMargin = printingDoc.DefaultPageSettings.Margins.Left;
    TopMargin = printingDoc.DefaultPageSettings.Margins.Top;
    RightMargin = printingDoc.DefaultPageSettings.Margins.Right;
    BottomMargin = printingDoc.DefaultPageSettings.Margins.Bottom;
    printAreaWidth = PageWidth - RightMargin - LeftMargin;

}

private void Form_PrintPage(object o, PrintPageEventArgs e)
//Here we Begin All the printing Process... 
{

       PrintSettings();
       CurrentY = (float)printingDoc.DefaultPageSettings.Margins.Top;//0;
       PrintEstHeader(e.Graphics);
        DrawEstGridData(e);

}

//Printing Function
private void PrintEstData(Graphics g, string stringData, StringAlignment alignment, Font fnt, Color clr, bool newLine)//,int starting,int maxWidth)
{
    StringFormat stringFormat = new StringFormat();
    stringFormat.Trimming = StringTrimming.Word;
    stringFormat.FormatFlags = StringFormatFlags.NoWrap |
        StringFormatFlags.LineLimit | StringFormatFlags.NoClip;

    stringFormat.Alignment = alignment;

    RectangleF Rect = new RectangleF((float)LeftMargin, CurrentY,
                      (float)PageWidth - (float)RightMargin - (float)LeftMargin,
                      g.MeasureString(stringData, fnt).Height);

    g.DrawString(stringData, fnt,
       new SolidBrush(clr),
       Rect, stringFormat);

    CurrentY += newLine ? g.MeasureString(stringData, fnt).Height : 0;
 }

private void PrintEstHeader(Graphics g)
{

    PrintEstData(g, "----------------------------------------------", StringAlignment.Near, new Font("Arial", 9), Color.Black, true);//,LeftMargin,printAreaWidth);

    PrintEstData(g, "Estimate" + "    " + "Rate  :" + ncRate.Value.ToString("0.00"), StringAlignment.Near, new Font("Arial", 9, FontStyle.Bold), Color.Black, true);//, LeftMargin, 76);

    PrintEstData(g, "----------------------------------------------", StringAlignment.Near, new Font("Arial", 9), Color.Black, true);//, LeftMargin, printAreaWidth);
    PrintEstData(g,"|ITEM |"+"WEIGHT|"+ "STN WT|"+"M.C. %|"+"Total|", StringAlignment.Near, new Font("Arial", 5), Color.Black, true);//,LeftMargin,42);
    PrintEstData(g, "----------------------------------------------", StringAlignment.Near, new Font("Arial", 9), Color.Black, true);//, LeftMargin, printAreaWidth);
}

Answer 1

Based on the printer specification it looks like it does not support arbitrary fonts, but only two inbuilt fixed width fonts. Unless you can print bitmaps to the printer or create user characters I doubt if you will be able to do more than select Font A or Font B.