给上传图片打水印
在ASP.NET中用Fckeditor,怎么给fckeditot上传的图片打水印啊,请高手指导一下,或者推荐一款好的编辑器,谢谢了 --------------------编程问答-------------------- 图片处理函数大全/// <summary>--------------------编程问答-------------------- 楼上 很强大 收藏了 --------------------编程问答-------------------- 收藏,我做水印都是在httphander上对请求图片的时候合成一张图片返回,不会对上传上来的图片进行改动 --------------------编程问答-------------------- 顺便问下楼主,有没有整过控制图片大小。或者是fck总大小 --------------------编程问答-------------------- 首选得分析FCKEditor上传内容,提取出图片的链接,找到图片,然后才能对图片进行操作。
/// 获取一个图片按等比例缩小后的大小。
/// </summary>
/// <param name="maxWidth">需要缩小到的宽度</param>
/// <param name="maxHeight">需要缩小到的高度</param>
/// <param name="imageOriginalWidth">图片的原始宽度</param>
/// <param name="imageOriginalHeight">图片的原始高度</param>
/// <returns>返回图片按等比例缩小后的实际大小</returns>
public static Size GetNewSize(int maxWidth, int maxHeight, int imageOriginalWidth, int imageOriginalHeight)
{
double w = 0.0;
double h = 0.0;
double sw = Convert.ToDouble(imageOriginalWidth);
double sh = Convert.ToDouble(imageOriginalHeight);
double mw = Convert.ToDouble(maxWidth);
double mh = Convert.ToDouble(maxHeight);
if (sw < mw && sh < mh)
{
w = sw;
h = sh;
}
else if ((sw / sh) > (mw / mh))
{
w = maxWidth;
h = (w * sh) / sw;
}
else
{
h = maxHeight;
w = (h * sw) / sh;
}
return new Size(Convert.ToInt32(w), Convert.ToInt32(h));
}
/// <summary>
/// 对给定的一个图片(Image对象)生成一个指定大小的缩略图。
/// </summary>
/// <param name="originalImage">原始图片</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
/// <returns>返回缩略图的Image对象</returns>
public static System.Drawing.Image GetThumbNailImage(System.Drawing.Image originalImage, int thumMaxWidth, int thumMaxHeight)
{
Size thumRealSize = Size.Empty;
System.Drawing.Image newImage = originalImage;
Graphics graphics = null;
try
{
thumRealSize = GetNewSize(thumMaxWidth, thumMaxHeight, originalImage.Width, originalImage.Height);
newImage = new Bitmap(thumRealSize.Width, thumRealSize.Height);
graphics = Graphics.FromImage(newImage);
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.Clear(Color.Transparent);
graphics.DrawImage(originalImage, new Rectangle(0, 0, thumRealSize.Width, thumRealSize.Height), new Rectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);
}
catch { }
finally
{
if (graphics != null)
{
graphics.Dispose();
graphics = null;
}
}
return newImage;
}
/// <summary>
/// 对给定的一个图片文件生成一个指定大小的缩略图。
/// </summary>
/// <param name="originalImage">图片的物理文件地址</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
/// <returns>返回缩略图的Image对象</returns>
public static System.Drawing.Image GetThumbNailImage(string imageFile, int thumMaxWidth, int thumMaxHeight)
{
System.Drawing.Image originalImage = null;
System.Drawing.Image newImage = null;
try
{
originalImage = System.Drawing.Image.FromFile(imageFile);
newImage = GetThumbNailImage(originalImage, thumMaxWidth, thumMaxHeight);
}
catch { }
finally
{
if (originalImage != null)
{
originalImage.Dispose();
originalImage = null;
}
}
return newImage;
}
/// <summary>
/// 对给定的一个图片文件生成一个指定大小的缩略图,并将缩略图保存到指定位置。
/// </summary>
/// <param name="originalImageFile">图片的物理文件地址</param>
/// <param name="thumbNailImageFile">缩略图的物理文件地址</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
public static void MakeThumbNail(string originalImageFile, string thumbNailImageFile, int thumMaxWidth, int thumMaxHeight)
{
System.Drawing.Image newImage = GetThumbNailImage(originalImageFile, thumMaxWidth, thumMaxHeight);
try
{
newImage.Save(thumbNailImageFile, ImageFormat.Jpeg);
}
catch
{ }
finally
{
newImage.Dispose();
newImage = null;
}
}
/// <summary>
/// 将一个图片的内存流调整为指定大小,并返回调整后的内存流。
/// </summary>
/// <param name="originalImageStream">原始图片的内存流</param>
/// <param name="newWidth">新图片的宽度</param>
/// <param name="newHeight">新图片的高度</param>
/// <returns>返回调整后的图片的内存流</returns>
public static MemoryStream ResizeImage(Stream originalImageStream, int newWidth, int newHeight)
{
MemoryStream newImageStream = null;
System.Drawing.Image newImage = Globals.GetThumbNailImage(System.Drawing.Image.FromStream(originalImageStream), newWidth, newHeight);
if (newImage != null)
{
newImageStream = new MemoryStream();
newImage.Save(newImageStream, ImageFormat.Jpeg);
}
return newImageStream;
}
/// <summary>
/// 将一个内存流保存为磁盘文件。
/// </summary>
/// <param name="stream">内存流</param>
/// <param name="newFile">目标磁盘文件地址</param>
public static void SaveStreamToFile(Stream stream, string newFile)
{
if (stream == null || stream.Length == 0 || string.IsNullOrEmpty(newFile))
{
return;
}
byte[] buffer = new byte[stream.Length];
stream.Position = 0;
stream.Read(buffer, 0, buffer.Length);
FileStream fileStream = new FileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write);
fileStream.Write(buffer, 0, buffer.Length);
fileStream.Flush();
fileStream.Close();
fileStream.Dispose();
}
/// <summary>
/// 对一个指定的图片加上图片水印效果。
/// </summary>
/// <param name="imageFile">图片文件地址</param>
/// <param name="waterImage">水印图片(Image对象)</param>
public static void CreateImageWaterMark(string imageFile, System.Drawing.Image waterImage)
{
if (string.IsNullOrEmpty(imageFile) || !File.Exists(imageFile) || waterImage == null)
{
return;
}
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);
if (originalImage.Width - 10 < waterImage.Width || originalImage.Height - 10 < waterImage.Height)
{
return;
}
Graphics graphics = Graphics.FromImage(originalImage);
int x = originalImage.Width - waterImage.Width - 10;
int y = originalImage.Height - waterImage.Height - 10;
int width = waterImage.Width;
int height = waterImage.Height;
graphics.DrawImage(waterImage, new Rectangle(x, y, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
graphics.Dispose();
MemoryStream stream = new MemoryStream();
originalImage.Save(stream, ImageFormat.Jpeg);
originalImage.Dispose();
System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);
imageWithWater.Save(imageFile);
imageWithWater.Dispose();
}
/// <summary>
/// 对一个指定的图片加上文字水印效果。
/// </summary>
/// <param name="imageFile">图片文件地址</param>
/// <param name="waterText">水印文字内容</param>
public static void CreateTextWaterMark(string imageFile, string waterText)
{
if (string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile))
{
return;
}
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);
Graphics graphics = Graphics.FromImage(originalImage);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
SolidBrush brush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
Font waterTextFont = new Font("Arial", 16, FontStyle.Regular);
SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont);
float x = (float)originalImage.Width - waterTextSize.Width - 10F;
float y = (float)originalImage.Height - waterTextSize.Height - 10F;
graphics.DrawString(waterText, waterTextFont, brush, x, y);
graphics.Dispose();
brush.Dispose();
MemoryStream stream = new MemoryStream();
originalImage.Save(stream, ImageFormat.Jpeg);
originalImage.Dispose();
System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);
imageWithWater.Save(imageFile);
imageWithWater.Dispose();
}
/// <summary>
/// 判断上传组件是否包含内容。
/// </summary>
/// <param name="fileUpload">ASP.NET 2.0标准上传组件</param>
/// <returns>如果数据有效,则返回True,否则返回False</returns>
public static bool IsAttachmentValid(FileUpload fileUpload)
{
if (fileUpload != null &&
fileUpload.PostedFile != null &&
!string.IsNullOrEmpty(fileUpload.PostedFile.FileName) &&
fileUpload.PostedFile.ContentLength > 0)
{
return true;
}
return false;
}
分析图片链接,可以用正则表达式
http://www.duzi.cn/article/2009-9-24/58966-1.htm --------------------编程问答-------------------- http://topic.csdn.net/u/20100622/10/5649265a-0cf3-413e-90ef-7fe52e167508.html --------------------编程问答-------------------- 有使用过在上传图片时 给其加水印 以及生成同比例图片 测过OK
http://download.csdn.net/source/2806516 --------------------编程问答-------------------- 2楼 很强大了 --------------------编程问答--------------------
/// <summary>--------------------编程问答-------------------- --------------------编程问答-------------------- 这个我弄过。好像要在fck里面加一段加水印的代码。大概是这样,具体我忘了。 --------------------编程问答-------------------- 怎么在httphander上弄返回图片? --------------------编程问答-------------------- 一楼的就OK乐 --------------------编程问答-------------------- 1楼的不错。
/// 图片管理类
/// </summary>
public class ImageMgr
{
/// <summary>
/// 半透明绘图
/// </summary>
/// <param name="value">透明度,1表示不透明</param>
/// <param name="position">水印图片位置</param>
/// <returns></returns>
public static void DrawOpacity(Graphics gh, int x, int y, int width, int height, Color color, float value)
{
try
{
float[][] ptsArray = {
new float[]{1,0,0,0,0},
new float[]{0,1,0,0,0},
new float[]{0,0,1,0,0},
new float[]{0,0,0,value,0},
new float[]{0,0,0,0,1}
};
ColorMatrix clrMatrix = new ColorMatrix(ptsArray);
ImageAttributes imgAttributes = new ImageAttributes();
imgAttributes.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
Bitmap bt = new Bitmap(width, height);
Graphics gh2 = Graphics.FromImage(bt);
gh2.Clear(color);
gh2.Dispose();
gh.DrawImage(bt, new Rectangle(x, y, width, height), x, y, width, height, GraphicsUnit.Pixel, imgAttributes);
gh.Save();
bt.Dispose();
}
catch
{ }
}
/// <summary>
/// 调整图片透明度
/// </summary>
/// <param name="value">透明度,1表示不透明</param>
/// <param name="position">水印图片位置</param>
/// <returns></returns>
public static void SetOpacity(Image bgimg, Image waterimg, float value, int movex, int movey, string position)
{
//Image temp = null;
//if (copy) temp = (Image)img.Clone();
movey = -movey;
float[][] ptsArray = {
new float[]{1,0,0,0,0},
new float[]{0,1,0,0,0},
new float[]{0,0,1,0,0},
new float[]{0,0,0,value,0},
new float[]{0,0,0,0,1}
};
ColorMatrix clrMatrix = new ColorMatrix(ptsArray);
ImageAttributes imgAttributes = new ImageAttributes();
imgAttributes.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int bx = 0; // 水印基本位置X
int by = 0; // 水印基本位置Y
if (position.StartsWith("Left")) { bx = 0; }
else if (position.StartsWith("Center")) { bx = (int)((bgimg.Width - waterimg.Width) / 2); }
else if (position.StartsWith("Right")) { bx = bgimg.Width - waterimg.Width; }
if (position.EndsWith("Top")) { by = 0; }
else if (position.EndsWith("Middle")) { by = (int)((bgimg.Height - waterimg.Height) / 2); }
else if (position.EndsWith("Bottom")) { by = bgimg.Height - waterimg.Height; }
// 绘图位置
Rectangle r = new Rectangle();
r.X = bx + movex;
r.Y = by + movey;
r.Width = waterimg.Width;
r.Height = waterimg.Height;
using (Graphics gh = Graphics.FromImage(bgimg))
{
gh.DrawImage(waterimg, r, 0, 0, waterimg.Width, waterimg.Height, GraphicsUnit.Pixel, imgAttributes);
gh.Save();
}
}
}
顶!
补充:.NET技术 , ASP.NET