BlogJava-century -文章分类-.net

gif转jpg，加水印清晰缩略图

百年 — Thu, 17 Apr 2008 01:38:00 GMT

public void MakeSmallImg(string FromImg,string SaveImg,System.Double Width,System.Double Height) {
/*
System.Drawing.Image Image=System.Drawing.Image.FromFile(FromImg);
*/
//原始图片名称
string originalFilename =FromImg;
//生成的高质量图片名称
string strGoodFile =SaveImg;

//从文件取得图片对象
System.Drawing.Image image = System.Drawing.Image.FromFile(originalFilename);
System.Double NewWidth,NewHeight;
if(image.Width>image.Height) {
  NewWidth=Width;
  NewHeight=image.Height*(NewWidth/image.Width);
} else {
  NewHeight=Height;
  NewWidth=(NewHeight/image.Height)*image.Width;
}

if (NewWidth>Width) {
NewWidth=Width;
}
if (NewHeight>Height) {
NewHeight=Height;
}

//取得图片大小
System.Drawing.Size size = new Size(int.Parse(ClDot(NewWidth.ToString())),int.Parse(ClDot(NewHeight.ToString())));
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width,size.Height);
//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空一下画布
g.Clear(Color.Blue);
//在指定位置画图
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height),
new System.Drawing.Rectangle(0, 0, image.Width,image.Height),
System.Drawing.GraphicsUnit.Pixel);

///文字水印
System.Drawing.Graphics G=System.Drawing.Graphics.FromImage(bitmap);
System.Drawing.Font f=new Font("宋体",10);
System.Drawing.Brush b=new SolidBrush(Color.Black);
G.DrawString(MarkText,f,b,10,10);
G.Dispose();

///图片水印
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(MarkLogo));
Graphics a = Graphics.FromImage(bitmap);
a.DrawImage(copyImage, new Rectangle(bitmap.Width-copyImage.Width,bitmap.Height-copyImage.Height,copyImage.Width, copyImage.Height),0,0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);

copyImage.Dispose();
a.Dispose();
copyImage.Dispose();

//保存高清晰度的缩略图
bitmap.Save(strGoodFile, System.Drawing.Imaging.ImageFormat.Jpeg);

g.Dispose();
image.Dispose();
}

source:http://feisha.cn/Articles/Art.162.htm

百年 2008-04-17 09:38 发表评论

为图像加入水印(Asp.net)

百年 — Thu, 17 Apr 2008 01:35:00 GMT

using System.Drawing;
using System.IO;
using System.Drawing.Imaging;
private void AddTextToImg(string fileName,string text)
{
if(!File.Exists(MapPath(fileName)))
{
throw new FileNotFoundException("The file don’t exist!");
}
if( text == string.Empty )
{
return;
}
//还需要判断文件类型是否为图像类型，这里就不赘述了
System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName));
Bitmap bitmap = new Bitmap(image,image.Width,image.Height);
Graphics g = Graphics.FromImage(bitmap);
float fontSize = 12.0f;     //字体大小
float textWidth = text.Length*fontSize;  //文本的长度
//下面定义一个矩形区域，以后在这个矩形里画上白底黑字
float rectX = 0;
float rectY = 0;
float rectWidth = text.Length*(fontSize+8);
float rectHeight = fontSize+8;
//声明矩形域
RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);
Font font = new Font("宋体",fontSize);   //定义字体
Brush whiteBrush = new SolidBrush(Color.White);   //白笔刷，画文字用
Brush blackBrush = new SolidBrush(Color.Black);   //黑笔刷，画背景用
g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);
g.DrawString(text,font,whiteBrush,textArea);
MemoryStream ms = new MemoryStream( );
//保存为Jpg类型
bitmap.Save(ms,ImageFormat.Jpeg);
//输出处理后的图像，这里为了演示方便，我将图片显示在页面中了
Response.Clear();
Response.ContentType = "image/jpeg";
Response.BinaryWrite( ms.ToArray() );
g.Dispose();
bitmap.Dispose();
image.Dispose();
}

调用时很简单，

AddTextToImg("me.jpg","文字");

source:http://feisha.cn/Articles/Art.62.htm

百年 2008-04-17 09:35 发表评论

google输入自动完成的简单模拟(用AJAX实现)

百年 — Fri, 05 Oct 2007 15:01:00 GMT

比较简单的模拟,文本框输入CompanyName,然后
搜索SqlServer2000 里NorthWind数据库 Suppliers表的CompanyName字段,
然后实现自动完成

四个文件
1 .AutoComplete.htm

输入自动完成

CompanyName

AutoComplete.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AutoComplete.aspx.cs" Inherits="AJAXBaseHome.AutoComplete" %>

AutoComplete.aspx.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.IO;
using System.Text;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Configuration;

namespace AJAXBaseHome
{
    public partial class AutoComplete : System.Web.UI.Page
    {
        private static string conString = WebConfigurationManager.ConnectionStrings["myData"].ConnectionString;

        protected void Page_Load(object sender, EventArgs e)
        {
            string input = GetInput();
            Response.Write(GetCompanyName(input));
        }

        //获取输入的字符串
        private string GetInput()
        {
            Stream s = Request.InputStream;
            int count = 0;
            byte[] buffer = new byte[1024];
            StringBuilder builder = new StringBuilder();
            while ((count = s.Read(buffer, 0, 1024)) > 0)
            {
                builder.Append(Encoding.UTF8.GetString(buffer, 0, count));
            }

return builder.ToString();
}

        private string GetCompanyName(string input)
        {
            using (SqlConnection con = new SqlConnection(conString))
            {
                SqlCommand command = new SqlCommand("select * from suppliers where CompanyName like @Name", con);
                command.Parameters.Add(new SqlParameter("@name", input + "%"));
                SqlDataAdapter adapter = new SqlDataAdapter(command);
                DataSet ds = new DataSet();
                adapter.Fill(ds);
                return ds.GetXml();
            }
        }
    }
}

xslt文件用于显示xml数据

http://www.vs2005.com/Ajax/427/2/default.aspx

百年 2007-10-05 23:01 发表评论