文件互转代码如下,留藏备用:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Linq;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;
namespace JPGChangeBMP
{
public partial class Frm_Main : Form
{
Bitmap bitmap;
public Frm_Main()
{
InitializeComponent();
}
private void buttonOpen_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "*.jpg|*.jpg";
openFileDialog.Title = "打开图像文件";
openFileDialog.Multiselect = false;
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
if (bitmap != null)
{
bitmap.Dispose();
}
string fileName = openFileDialog.FileName;
bitmap = new Bitmap(fileName);
if (bitmap.Width > bitmap.Height)
{
pictureBox.Width = panel2.Width;
pictureBox.Height = (int)((double)bitmap.Height * panel2.Width / bitmap.Width);
}
else
{
pictureBox.Height = panel2.Height;
pictureBox.Width = (int)((double)bitmap.Width * panel2.Height / bitmap.Height);
}
pictureBox.Image = bitmap;
FileInfo f = new FileInfo(fileName);
this.Text = "图像转换:" + f.Name;
this.label1.Text = f.Name;
buttonConvert.Enabled = true;
}
}
private void panel2_Resize(object sender, EventArgs e)
{
pictureBox.Top = panel1.Top;
pictureBox.Left = panel1.Left;
if (bitmap != null)
{
if (bitmap.Width > bitmap.Height)
{
pictureBox.Width = panel2.Width;
pictureBox.Height = (int)((double)bitmap.Height * panel2.Width / bitmap.Width);
}
else
{
pictureBox.Height = panel2.Height;
pictureBox.Width = (int)((double)bitmap.Width * panel2.Height / bitmap.Height);
}
}
else
{
pictureBox.Width = panel2.Width;
pictureBox.Height = panel2.Height;
}
pictureBox.Refresh();
}
private void buttonConvert_Click(object sender, EventArgs e)
{
if (comboBox.SelectedItem == null) //如果没有选定项
{
return; //退出本次操作
}
else
{
SaveFileDialog saveFileDialog = new SaveFileDialog(); //实例化SaveFileDialog类
saveFileDialog.Title = "转化为:"; //设置“另存为”对话框的题标
saveFileDialog.OverwritePrompt = true; //如果文件名存在则提示
saveFileDialog.CheckPathExists = true; //如果文件的路径不存在则提示
saveFileDialog.Filter = comboBox.Text + "|" + comboBox.Text; //设置文件类型
if (saveFileDialog.ShowDialog() == DialogResult.OK) //打开“另存为”对话框
{
string fileName = saveFileDialog.FileName; //获取另存为文件的路径及名称
bitmap.Save(fileName, ImageFormat.Bmp); //调用Save方法将图片保存为Bmp格式
FileInfo f = new FileInfo(fileName); //实例化FileInfo类
this.Text = "图像转换:" + f.Name; //设置窗体标题栏
label1.Text = f.Name;
}
}
}
}
}