File-IO
Børre Stenseth
Moduler>GUI-komponenter>FileLoad

Last opp tekst og bilde

Hva
screen
Last opp text og bilde

Et veldig enkelt program som laster opp en tekst og/eller et gif-bilde. Merk at bildet skaleres til den størrelsen som er avsatt.

Vi lager det nytt "project" av typen "Windows Application". Så bruker vi GUI-editoren til å lage en enkel form. Vi får igjen tre kildefiler:

  • Program.cs
  • Form1.cs
  • Form1.Designer.cs

Vi konsentrerer oss om den ene fila som inneholder vår handskrevne kode

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D
;
namespace control7
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            openFileDialog1.FileName="";
            openFileDialog1.Filter = "txt files (*.txt)|*.txt";
            if(openFileDialog1.ShowDialog()==DialogResult.OK)
            {
                textBox1.Text = ReadTextFile(openFileDialog1.FileName);
            }
        }
        
       private void button1_Click(object sender, EventArgs e)
       {
           openFileDialog1.FileName = "";
           openFileDialog1.Filter = "gif files (*.gif)|*.gif";
           if (openFileDialog1.ShowDialog() == DialogResult.OK)
           {
               //pictureBox1.ImageLocation = openFileDialog1.FileName;
               Image im = Image.FromFile(openFileDialog1.FileName);
               Image im2 = FixedSize(im, pictureBox1.Width, pictureBox1.Height);
               pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
               //pictureBox1.Image = im;
               pictureBox1.Image = im2;
           }
       }
        private String ReadTextFile(String filename)
        {
            StreamReader sr=null;
            String result = "";
            try
            {
                sr = new StreamReader(
                        new FileStream(filename, 
                            FileMode.Open, 
                            FileAccess.Read));
                result = sr.ReadToEnd();
            }
            catch (Exception ex)
            {
                result= ex.Message;
            }
            finally
            {
                if ( sr !=null)
                    sr.Close();                
            }      
            return result;
        }
        static Image FixedSize(Image imgPhoto, int Width, int Height)
        {
            // one of many ways to resize an image
            // taken from :http://www.codeproject.com/csharp/imageresize.asp
            int sourceWidth = imgPhoto.Width;
            int sourceHeight = imgPhoto.Height;
            int sourceX = 0;
            int sourceY = 0;
            int destX = 0;
            int destY = 0;
            float nPercent = 0;
            float nPercentW = 0;
            float nPercentH = 0;
            nPercentW = ((float)Width / (float)sourceWidth);
            nPercentH = ((float)Height / (float)sourceHeight);
            if (nPercentH < nPercentW)
            {
                nPercent = nPercentH;
                destX = System.Convert.ToInt16((Width -
                              (sourceWidth * nPercent)) / 2);
            }
            else
            {
                nPercent = nPercentW;
                destY = System.Convert.ToInt16((Height -
                              (sourceHeight * nPercent)) / 2);
            }
            int destWidth = (int)(sourceWidth * nPercent);
            int destHeight = (int)(sourceHeight * nPercent);
            Bitmap bmPhoto = new Bitmap(Width, Height,
                              PixelFormat.Format24bppRgb);
            bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
                             imgPhoto.VerticalResolution);
            Graphics grPhoto = Graphics.FromImage(bmPhoto);
            // something to fill with:
            // grPhoto.Clear(Color.Red);
            grPhoto.Clear(System.Drawing.SystemColors.Control);
            grPhoto.InterpolationMode =
                    InterpolationMode.HighQualityBicubic;
            grPhoto.DrawImage(imgPhoto,
                new Rectangle(destX, destY, destWidth, destHeight),
                new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
                GraphicsUnit.Pixel);
            grPhoto.Dispose();
            return bmPhoto;
        }
     }
}
Referanser
Prosjektet:
https://svn.hiof.no/svn/psource/Csharpspikes/control7
Vedlikehold
B.Stenseth, desember 2006
(Velkommen) Moduler>GUI-komponenter>FileLoad (Menues)