/// <summary>
/// 上传图片，只有在宽度>0且高度>0时创建缩略图
/// </summary>
/// <param name="imgFile">上传控件</param>
/// <param name="maxSize">最大上传文件大小（单位：M）</param>
/// <param name="thumbnailWidth">缩略图宽度</param>
/// <param name="thumbnailHeight">缩略图高度</param>
/// <param name="mode">创建缩略图方式</param>
/// <param name="imgUrl">返回的图片链接</param>
/// <returns></returns>
public UploadStatus UploadImage(HttpPostedFile imgFile, int maxSize, int thumbnailWidth, int thumbnailHeight, CreateThumbnailMode mode, ref string imgUrl)
{
if (imgFile == null || string.IsNullOrEmpty(imgFile.FileName))
{
return(UploadStatus.US_NOT_FOUND);
}
else
{
try
{
HttpContext context = HttpContext.Current;
string appPath = context.Request.ApplicationPath;
if (!appPath.EndsWith("/"))
{
appPath += "/";
}
string uploadPath = ConfigurationManager.AppSettings["UploadPath"];
if (string.IsNullOrEmpty(uploadPath))
{
uploadPath = "~/Files/";
}
if (uploadPath.StartsWith("~/"))
{
uploadPath = appPath + uploadPath.Substring(2);
}
else if (uploadPath.StartsWith("/"))
{
uploadPath = appPath + uploadPath.Substring(1);
}
else
{
uploadPath = appPath + uploadPath;
}
if (!uploadPath.EndsWith("/"))
{
uploadPath += "/";
}
//文件保存目录路径
string savePath = context.Server.MapPath(uploadPath);
//文件保存目录URL
string saveUrl = uploadPath;
//定义允许上传的文件扩展名
Hashtable extTable = new Hashtable();
extTable.Add("image", "gif,jpg,jpeg,png,bmp");
//最大文件大小
//int maxSize = 5; //5M
//string fileMaxSize = ConfigurationManager.AppSettings["FileMaxSize"];
//if (!string.IsNullOrEmpty(fileMaxSize))
// maxSize = Convert.ToInt32(fileMaxSize);
if (maxSize < 1)
{
maxSize = 5;
}
maxSize = maxSize * 1024 * 1024;
string dirPath = savePath;
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string dirName = "image";
string fileName = imgFile.FileName;
string fileExt = Path.GetExtension(fileName).ToLower();
if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize)
{
//上传文件大小超过限制
return(UploadStatus.US_TOO_LONG);
}
if (string.IsNullOrEmpty(fileExt) || Array.IndexOf(((string)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1)
{
//上传文件扩展名是不允许的扩展名。
return(UploadStatus.US_NOT_SUPPORT);
}
//创建文件夹
dirPath += dirName + "\\";
saveUrl += dirName + "/";
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string ymd = DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
dirPath += ymd + "\\";
saveUrl += ymd + "/";
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff_b", DateTimeFormatInfo.InvariantInfo) + fileExt;
string filePath = dirPath + newFileName;
imgFile.SaveAs(filePath);
string thumbnailFile = newFileName.Replace("_b", "_s");
string thumbnailFilePath = dirPath + thumbnailFile;
if (mode != CreateThumbnailMode.CTM_NONE && (thumbnailWidth > 0 && thumbnailHeight > 0))
{
// 生成缩略图
CreateThumbnail(filePath, thumbnailFilePath, thumbnailWidth, thumbnailHeight, mode);
}
// 添加水印
if (WatermarkInfo.AddWatermark == 1 || WatermarkInfo.AddWatermark == 3)
{
newFileName = "w_" + newFileName;
addWaterMark(filePath, dirPath + newFileName, true);
}
if (WatermarkInfo.AddWatermark == 2 || WatermarkInfo.AddWatermark == 3)
{
thumbnailFile = "w_" + thumbnailFile;
addWaterMark(thumbnailFilePath, dirPath + thumbnailFile, false);
}
// 返回图片链接
imgUrl = saveUrl + newFileName;
return(UploadStatus.US_SUCCESSED);
}
catch
{
return(UploadStatus.US_FAILED);
}
}
}
/// <summary>
/// 上传图片，只有在宽度>0且高度>0时创建缩略图
/// </summary>
/// <param name="imgFile">上传控件</param>
/// <param name="maxSize">最大上传文件大小（单位：M）</param>
/// <param name="thumbnailWidth">缩略图宽度</param>
/// <param name="thumbnailHeight">缩略图高度</param>
/// <param name="mode">创建缩略图方式</param>
/// <param name="imgUrl">返回的图片链接</param>
/// <returns></returns>
public UploadStatus UploadImage(HttpPostedFile imgFile, int maxSize, int thumbnailWidth, int thumbnailHeight, CreateThumbnailMode mode, ref string imgUrl)
{
if (imgFile == null || string.IsNullOrEmpty(imgFile.FileName))
{
return UploadStatus.US_NOT_FOUND;
}
else
{
try
{
HttpContext context = HttpContext.Current;
string appPath = context.Request.ApplicationPath;
if (!appPath.EndsWith("/")) appPath += "/";
string uploadPath = ConfigurationManager.AppSettings["UploadPath"];
if (string.IsNullOrEmpty(uploadPath))
{
uploadPath = "~/Files/";
}
if (uploadPath.StartsWith("~/"))
{
uploadPath = appPath + uploadPath.Substring(2);
}
else if (uploadPath.StartsWith("/"))
{
uploadPath = appPath + uploadPath.Substring(1);
}
else
{
uploadPath = appPath + uploadPath;
}
if (!uploadPath.EndsWith("/")) uploadPath += "/";
//文件保存目录路径
string savePath = context.Server.MapPath(uploadPath);
//文件保存目录URL
string saveUrl = uploadPath;
//定义允许上传的文件扩展名
Hashtable extTable = new Hashtable();
extTable.Add("image", "gif,jpg,jpeg,png,bmp");
//最大文件大小
//int maxSize = 5; //5M
//string fileMaxSize = ConfigurationManager.AppSettings["FileMaxSize"];
//if (!string.IsNullOrEmpty(fileMaxSize))
// maxSize = Convert.ToInt32(fileMaxSize);
if (maxSize < 1) maxSize = 5;
maxSize = maxSize * 1024 * 1024;
string dirPath = savePath;
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string dirName = "image";
string fileName = imgFile.FileName;
string fileExt = Path.GetExtension(fileName).ToLower();
if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize)
{
//上传文件大小超过限制
return UploadStatus.US_TOO_LONG;
}
if (string.IsNullOrEmpty(fileExt) || Array.IndexOf(((string)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1)
{
//上传文件扩展名是不允许的扩展名。
return UploadStatus.US_NOT_SUPPORT;
}
//创建文件夹
dirPath += dirName + "\\";
saveUrl += dirName + "/";
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string ymd = DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
dirPath += ymd + "\\";
saveUrl += ymd + "/";
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
string newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff_b", DateTimeFormatInfo.InvariantInfo) + fileExt;
string filePath = dirPath + newFileName;
imgFile.SaveAs(filePath);
string thumbnailFile = newFileName.Replace("_b", "_s");
string thumbnailFilePath = dirPath + thumbnailFile;
if (mode != CreateThumbnailMode.CTM_NONE && (thumbnailWidth > 0 && thumbnailHeight > 0))
{
// 生成缩略图
CreateThumbnail(filePath, thumbnailFilePath, thumbnailWidth, thumbnailHeight, mode);
}
// 添加水印
if (WatermarkInfo.AddWatermark == 1 || WatermarkInfo.AddWatermark == 3)
{
newFileName = "w_" + newFileName;
addWaterMark(filePath, dirPath + newFileName, true);
}
if (WatermarkInfo.AddWatermark == 2 || WatermarkInfo.AddWatermark == 3)
{
thumbnailFile = "w_" + thumbnailFile;
addWaterMark(thumbnailFilePath, dirPath + thumbnailFile, false);
}
// 返回图片链接
imgUrl = saveUrl + newFileName;
return UploadStatus.US_SUCCESSED;
}
catch
{
return UploadStatus.US_FAILED;
}
}
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public bool CreateThumbnail(string originalImagePath, string thumbnailPath, int width, int height, CreateThumbnailMode mode)
{
bool ret = true;
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case CreateThumbnailMode.CTM_WIDTH_HEIGHT: //指定高宽缩放（可能变形）
break;
case CreateThumbnailMode.CTM_WIDTH: //指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case CreateThumbnailMode.CTM_HEIGHT: //指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case CreateThumbnailMode.CTM_CUT: //指定高宽裁减（不变形）
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一个画板
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;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
//throw e;
ret = false;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
return(ret);
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public bool CreateThumbnail(string originalImagePath, string thumbnailPath, int width, int height, CreateThumbnailMode mode)
{
bool ret = true;
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case CreateThumbnailMode.CTM_WIDTH_HEIGHT://指定高宽缩放（可能变形）
break;
case CreateThumbnailMode.CTM_WIDTH://指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case CreateThumbnailMode.CTM_HEIGHT://指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case CreateThumbnailMode.CTM_CUT://指定高宽裁减（不变形）
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一个画板
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;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
//throw e;
ret = false;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
return ret;
}
