windows explore在查看文件中有查看缩略图这一选项,他的实质就是从thumbs文件中读取出已经生成的缩略图文件
然后做为image显示出来
在网上有如何读出thumbs文件的类库,今天使用这个类库模仿一下window explorer
类库的源地址
http://www.petedavis.net/MySite/DynPageView.aspx?pageid=31
原理读出thumbs文件中的图像并生成一个picturebox数组,显示图像并放置到窗体上,在picturebox被单击时,击发一个事件
将原图显示出来
private
string
[] allfilename; ThumbDBLib.ThumbDB test;
private
PictureBox[] allimage;
private
void
button1_Click(
object
sender, System.EventArgs e)
...
{
this.Invalidate(); test=new ThumbDB(this.textBox1.Text); allfilename=test.GetThumbfiles(); allimage=new PictureBox[allfilename.Length]; int x=0,y=50; int i=0; foreach(string bb in allfilename)
...{ allimage[i]=new PictureBox(); allimage[i].Location=new Point(x,y); Image gotimg=test.GetThumbnailImage(bb); x+=80; if(x>this.Width) ...{ x=0; y+=80;
} allimage[i].Image=gotimg; allimage[i].Size=new Size(75,75); allimage[i].SizeMode=PictureBoxSizeMode.StretchImage; allimage[i].Click+=new EventHandler(ImageControl_Click); allimage[i].Tag=bb; this.Controls.Add(allimage[i]); //this.Refresh(); i++; } 
}
/**/
/// <summary>/// 当用户单击时显示大图片/// </summary>/// <param name="sender"></param>/// <param name="e"></param>
private
void
ImageControl_Click(
object
sender, EventArgs e)
...
{ Form showbig=new Form(); string filename=Utitlity.GetDirFromFileName(textBox1.Text)+"/"+(sender as PictureBox).Tag; PictureBox pb=new PictureBox(); Bitmap showmap=new Bitmap(filename); pb.Image=showmap; pb.Size=new Size(showmap.Width,showmap.Height); showbig.Size=new Size(showmap.Width,showmap.Height); pb.Location=new Point(0,0); showbig.Controls.Add(pb); if(showbig.ShowDialog()==DialogResult.OK) ...{ showbig.Dispose(); } }
public
class
Utitlity
...
{ /**//// <summary> /// 从文件名中取出文件路径 /// </summary> /// <param name="filename">文件名</param> /// <returns>文件所在的路径</returns> public static string GetDirFromFileName(string filename) ...{ string[] allpart=filename.Split('/'); return filename.Replace(allpart[allpart.Length-1],string.Empty); }}
