在图片上加水印有点问题
//add_certify.aspx页面的内容如下：
<%@ Page Language= "C# " ResponseEncoding= "gb2312 " src= "add_certify.aspx.cs " Inherits= "namespace.classname "%>
<script runat= "server ">
protected void Page_load(Object Src, EventArgs E)
{
................
}
void UploadBtn_Click(Object sender,EventArgs e)
{
AddTextToImg( "../img/1.gif ", "Family.Man ");
}
</script>
//add_certify.aspx.cs页面的内容如下：
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();
}
我对c#不是很熟悉（上面这些是用在web上的），我调试的时候的错误信息是：
编译器错误信息: CS0116: 命名空间并不直接包含诸如字段或方法之类的成员
[解决办法]
[解决办法]
友情帮定一下
[解决办法]
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
namespace Tutorial
{
class WaterMark
{
[STAThread]
static void Main(string[] args)
{
//set a working directory
string WorkingDirectory = @ "C:\Documents and Settings\administrator.JAZZMINE\My Documents\Projects\Tutorials\WaterMark ";
//define a string of text to use as the Copyright message
string Copyright = "Copyright ?2002 - AP Photo/David Zalubowski ";
//create a image object containing the photograph to watermark
Image imgPhoto = Image.FromFile(WorkingDirectory + "\\watermark_photo.jpg ");
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//create a Bitmap the Size of the original photograph
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//load the Bitmap into a Graphics object
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//create a image object containing the watermark
Image imgWatermark = new Bitmap(WorkingDirectory + "\\watermark.bmp ");
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//------------------------
//Step #1 - Insert Copyright message
//------------------------
//Set the rendering quality for this Graphics object
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//Draws the photo Image object at original size to the graphics object.
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[]{16,14,12,10,8,6,4};
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i=0 ;i <7; i++)
{
//set a Font object to Arial (i)pt, Bold
crFont = new Font( "arial ", sizes[i], FontStyle.Bold);
//Measure the Copyright string in this Font
crSize = grPhoto.MeasureString(Copyright, crFont);
if((ushort)crSize.Width < (ushort)phWidth)
break;
}
//Since all photographs will have varying heights, determine a
//position 5% from the bottom of the image
int yPixlesFromBottom = (int)(phHeight *.05);
//Now that we have a point size use the Copyrights string height
//to determine a y-coordinate to draw the string of the photograph
float yPosFromBottom = ((phHeight - yPixlesFromBottom)-(crSize.Height/2));
//Determine its x-coordinate by calculating the center of the width of the image
float xCenterOfImg = (phWidth/2);
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
//define a Brush which is semi trasparent black (Alpha set to 153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
//Draw the Copyright string
grPhoto.DrawString(Copyright, //string of text
crFont, //font
semiTransBrush2, //Brush
new PointF(xCenterOfImg+1,yPosFromBottom+1), //Position
StrFormat);
//define a Brush which is semi trasparent white (Alpha set to 153)
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
//Draw the Copyright string a second time to create a shadow effect
//Make sure to move this text 1 pixel to the right and down 1 pixel
grPhoto.DrawString(Copyright, //string of text
crFont, //font
semiTransBrush, //Brush
new PointF(xCenterOfImg,yPosFromBottom), //Position
StrFormat); //Text alignment
//------------------------
//Step #2 - Insert Watermark image
//------------------------
[解决办法]
你加上
simage.Dispose();
oldimage.Dispose();
加在
//===================水印图片结束==============================
的上面就行
但你这个程序好象不怎么合理
