Library code snippets
A shell for Google's image search
By Michael H, published on 12 Jan 2004
A program that searches on Google's Image Search.
/*
* by Mike H (GbaGuy) - http://k2pts.home.comcast.net/gbaguy/
* vbnetprogramer@hotmail.com
*
* I don't care what you do with this. GPL.
*
* All the calls to GC.Collect() are probably unnecessary, but
* then again so are the dialog boxes that say "error: out of memory"...
*/
using System;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Collections;
using System.Drawing;
using System.Diagnostics;
class ImageSearch : Form {
string searchstring = "http://images.google.com/images?hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&q=";
string alternatesearch = "http://images.google.com/images?q=SEARCH&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&filter=0";
string resultpage = "";
string startoftable = "table align=center border=0 cellpadding=5 cellspacing=0";
string moreimglink = "http://images.google.com/images?q=SEARCH&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&start=SET&sa=N";
int seto20 = 0;
ArrayList thumbs = new ArrayList();
ArrayList googlethumbs = new ArrayList();
ArrayList links = new ArrayList();
ArrayList gtsizes = new ArrayList();
ArrayList labels = new ArrayList();
TextBox urlTB = new TextBox();
string searchtext = "";
MenuItem mnuOptions = new MenuItem("Options");
MenuItem mnuNext = new MenuItem("Next");
MenuItem mnuPrev = new MenuItem("Previous");
private void next20(object s,EventArgs e) {
seto20 += 20;
try {
search();
} catch(Exception d) {
d=d;
seto20 -= 20;
MessageBox.Show("No more pics.","Error");
}
}
private void prev20(object s, EventArgs e) {
if(seto20!=0) {
seto20 -= 20;
} else {
MessageBox.Show("Can't go back.","Error");
return;
}
try {
search();
} catch(Exception d) {
d=d;
MessageBox.Show("Can't go back.","Error");
}
}
public ImageSearch() {
urlTB.Dock = DockStyle.Top;
urlTB.Multiline = true;
urlTB.KeyDown += new KeyEventHandler(Key_Down);
this.Controls.Add(urlTB);
this.Text = "Image Search (Powered by Google)";
this.WindowState = FormWindowState.Maximized;
this.Menu = new MainMenu();
this.Menu.MenuItems.Add(mnuOptions);
mnuOptions.MenuItems.Add(mnuNext);
mnuOptions.MenuItems.Add(mnuPrev);
mnuNext.Click += new EventHandler(next20);
mnuPrev.Click += new EventHandler(prev20);
this.Show();
}
private void Key_Down(object s,KeyEventArgs e) {
if(Keys.Enter==e.KeyCode) {
e.Handled = true;
seto20 = 0;
searchtext = urlTB.Text;
search();
urlTB.Clear();
}
}
private void search() {
foreach(Label c in labels) {
c.Image = null;
c.Visible = false;
c.Dispose();
}
Application.DoEvents();
System.GC.Collect();
Application.DoEvents();
System.GC.Collect();
googlethumbs = new ArrayList();
thumbs = new ArrayList();
links = new ArrayList();
gtsizes = new ArrayList();
WebClient WC = new WebClient();
byte[] data = null;
if(seto20!=0)
data = WC.DownloadData(moreimglink.Replace("SEARCH",searchtext.Replace(" ","+")).Replace("SET",seto20.ToString()));
else
data = WC.DownloadData(searchstring + urlTB.Text.Replace(" ","+"));
WC.Dispose();
System.Text.ASCIIEncoding AE = new System.Text.ASCIIEncoding();
resultpage = AE.GetString(data, 0, data.Length);
resultpage = resultpage.Substring(resultpage.IndexOf(startoftable)+startoftable.Length);
try {
resultpage = resultpage.Substring(0,resultpage.IndexOf("Result Page: ));
} catch(Exception e44) {
e44=e44;
WebClient Wc = new WebClient();
byte[] daTa = Wc.DownloadData(alternatesearch.Replace("SEARCH",urlTB.Text.Replace(" ","+")));
Wc.Dispose();
System.Text.ASCIIEncoding Ae = new System.Text.ASCIIEncoding();
resultpage = Ae.GetString(daTa, 0, daTa.Length);
resultpage = resultpage.Substring(resultpage.IndexOf(startoftable)+startoftable.Length);
}
parse();
//WriteToFile();
resultpage = null;
showIMGs();
}
private void showIMGs() {
int x = 5;
int y = 20;
int largestY = 0;
if(!Directory.Exists(@"C:\pics"))
Directory.CreateDirectory(@"C:\pics");
for(int i=0;i<thumbs.Count;i++) {
Application.DoEvents();
Label l = new Label();
WebClient WC = new WebClient();
try {
byte[] im = WC.DownloadData((string)googlethumbs[i]);
WC.Dispose();
BinaryWriter BW = new BinaryWriter(new StreamWriter(@"C:\pics\" + i.ToString() + ".jpg").BaseStream);
BW.Write(im);
BW.BaseStream.Close();
BW.Close();
BW = null;
WC = null;
} catch(Exception er) {
er=er;
Console.WriteLine("ERROR: Can't d/l '" + googlethumbs[i] + "'.");
continue;
}
l.Image = Image.FromFile(@"C:\pics\" + i.ToString() + ".jpg");
l.Image = l.Image.GetThumbnailImage(((Size)gtsizes[i]).Width,((Size)gtsizes[i]).Height,null,new IntPtr(0));
l.Width = l.Image.Width;
l.Height = l.Image.Height;
if(l.Height>largestY)
largestY = l.Height;
l.Location = new Point(x,y);
x += l.Width + 5;
if(x>800) {
x = 5;
y += largestY + 5;
}
l.Tag = i;
Console.WriteLine(i);
l.MouseDown += new MouseEventHandler(showstuff);
this.Controls.Add(l);
labels.Add(l);
WC = null;
Application.DoEvents();
}
Application.DoEvents();
System.GC.Collect();
Application.DoEvents();
System.GC.Collect();
}
private void showstuff(object s,MouseEventArgs e) {
if(System.Windows.Forms.MouseButtons.Right==e.Button) {
Label l = (Label)s;
Process.Start(@"C:\program files\internet explorer\iexplore.exe",(string)links[(int)l.Tag]);
} else {
Label l = (Label)s;
WebClient WC = new WebClient();
try {
WC.OpenRead((string)thumbs[(int)l.Tag]).Close();
WC.Dispose();
Process.Start(@"C:\program files\internet explorer\iexplore.exe",(string)thumbs[(int)l.Tag]);
} catch(Exception e44) {
e44=e44;
Process.Start(@"C:\program files\internet explorer\iexplore.exe",(string)links[(int)l.Tag]);
}
}
}
private void parse() {
string k = resultpage;
for(int i=0;i<k.Length;i++) {
if(k[i]=='<'&&k[i+1]=='a') {
Application.DoEvents();
if(k.Substring(i,23)=="<a href=/imgres?imgurl=") {
i += 23;
string t = k.Substring(i,k.IndexOf("&",i)-i);
i = k.IndexOf("&imgrefurl=",i) + 11;
string l = k.Substring(i,k.IndexOf("&",i)-i);
i = k.IndexOf("img src=/images?q=tbn:",i) + 22;
string gt = "http://images.google.com/images?q=tbn:" + k.Substring(i,k.IndexOf(":",i)-i);
i = k.IndexOf("width=",i) + 6;
int w = Int32.Parse(k.Substring(i,k.IndexOf(" ",i)-i));
i = k.IndexOf("height=",i) + 7;
int h = Int32.Parse(k.Substring(i,k.IndexOf(">",i)-i));
gt += ":" + t;
googlethumbs.Add(gt);
thumbs.Add("http://" + t);
links.Add(l);
gtsizes.Add(new Size(w,h));
}
}
Application.DoEvents();
System.GC.Collect();
}
}
private void WriteToFile() {
StreamWriter SW = new StreamWriter("testgi.htm");
SW.WriteLine(resultpage);
SW.Close();
SW = null;
}
public static void Main() {
Application.Run(new ImageSearch());
}
}
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Greetings,
I notice in your code sample that you force a Garbage Collection frequently and comment about 'Out of Memory' errors when calling Image.GetThummbnailImage(...);
I, too, have been having serious problems with that Out of Memory error. I tried forcing a GC (and a .Dispose() beforehand), as you did here, but it did not help. I also notice that when the method is called, the memory usage on that process skyrockets way more than the size of the Image file. Still, I have excess physical memory and yet I get these errors.
Can anyone enlighten me as to what's happening here or how to get around it? Is there a bad malloc in GDI+ or something? Is there a workaround someone has found?
I'm in a bit of a pickle until I can get this working...
Cheers
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