Class derived from Printdocument class C#

Question

I have a class to print labels (Cprint), this class is derived from the class PrintDocument. It takes an image calling a method contained in the class Form1.cs.

Follow the code of the class CPrint.cs (derived from the class PrintDocument):

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Printing;
using System.IO;

namespace WindowsApplication1
{
class CPrint : PrintDocument
{
    private Font printFont;
    private TextReader printStream;
    private string fileToPrint;
    private Bitmap imgWatermark, bmpImg;

    public bool Watermark = false;

    public CPrint()
    {
        Form1 principal = new Form1();

        imgWatermark = principal.enviaImg();  //ESSE TEM QUE RECEBER A IMAGEM


    }

    public CPrint(string fileName) : this()
    {
        this.FileToPrint = fileName;
    }

    public string FileToPrint
    {
        get
        {
            return fileToPrint;
        }
        set
        {
            if (File.Exists(value))
            {
                CPrint p = new CPrint();
                fileToPrint = value;
                this.DocumentName = value;
            }
            else
                throw (new Exception("File not found."));
        }
    }

    public Font Font
    {
        get { return printFont; }
        set { printFont = value; }
    }

    protected override void OnBeginPrint(PrintEventArgs e)
    {
        base.OnBeginPrint(e);
        printFont = new Font("Verdana", 10);
        printStream = new StreamReader(FileToPrint);
    }

    protected override void OnEndPrint(PrintEventArgs e)
    {
        base.OnEndPrint(e);
        printFont.Dispose();
        printStream.Close();
    }

    protected override void OnPrintPage(PrintPageEventArgs e)
    {
        base.OnPrintPage(e);

        // Slow down printing for demo.
        System.Threading.Thread.Sleep(200);

        Graphics gdiPage = e.Graphics;
        float leftMargin = e.MarginBounds.Left;
        float topMargin = e.MarginBounds.Top;
        float lineHeight = printFont.GetHeight(gdiPage);
        float linesPerPage = e.MarginBounds.Height / lineHeight;
        int lineCount = 0;
        string lineText = null;

        // Watermark?
        if (this.Watermark)
        {
            int top = Math.Max(0,
                     (e.PageBounds.Height - imgWatermark.Height) / 2);
            int left = Math.Max(0,
                     (e.PageBounds.Width - imgWatermark.Width) / 2);
            gdiPage.DrawImage(imgWatermark, left, top,
                     imgWatermark.Width, imgWatermark.Height);
        }

        // Print each line of the file.
        while (lineCount < linesPerPage &&
              ((lineText = printStream.ReadLine()) != null))
        {
            gdiPage.DrawString(lineText, printFont, Brushes.Black,
            leftMargin, (topMargin + (lineCount++ * lineHeight)));
        }

        // If more lines exist, print another page.
        if (lineText != null)
            e.HasMorePages = true;
        else
            e.HasMorePages = false;
    }
}
}

What is going wrong is that the name of the document that is not acquired and with that in the method OnBeginPrint in this line printStream = new StreamReader(FileToPrint); does not receive the return of the method FileToPrint because it (method FileToPrint) only executes the part get of the code and not the set that where it should acquire the file name.

Thanks in advance!

Answer 1

Seems to me you’re using the wrong builder.

Your button code.

Print printDoc = new CPrint(); 
rintDialog dlgPrint = new PrintDialog(); 
lgPrint.Document = printDoc; 
f (dlgPrint.ShowDialog() == DialogResult.OK) { printDoc.Print(); }

You don’t think this should be used :

Print printDoc = new CPrint("NomeDoDocumentoASerImpresso"); 

Because it is the constructor that receives the name of the document and associates to private property fileToPrint