/// <summary>
/// 返回新的后缀
/// </summary>
/// <param name="fromFileStream">文件流</param>
/// <param name="fileSaveUrl">保存地址，后缀为gif,png,jpg，所有其它后缀会统一改成jpg</param>
/// <param name="templateWidth">最大宽度</param>
/// <param name="templateHeight">最大高度</param>
/// <param name="jpgQuality">压缩质量</param>
/// <returns></returns>
public static string MakeSmallImg(System.IO.Stream fromFileStream, string fileSaveUrl, System.Double templateWidth, System.Double templateHeight, int jpgQuality)
{
//从文件取得图片对象，并使用流中嵌入的颜色管理信息
System.Drawing.Image myImage = System.Drawing.Image.FromStream(fromFileStream, true);
//缩略图宽、高
System.Double newWidth = myImage.Width, newHeight = myImage.Height;
//宽大于模版的横图
if (myImage.Width >= myImage.Height)
{
if (myImage.Width > templateWidth)
{
//宽按模版，高按比例缩放
newWidth = templateWidth;
newHeight = myImage.Height * (newWidth / myImage.Width);
}
}
//高大于模版的竖图
else
{
if (myImage.Height > templateHeight)
{
//高按模版，宽按比例缩放
newHeight = templateHeight;
newWidth = myImage.Width * (newHeight / myImage.Height);
}
}
//取得图片大小
System.Drawing.Size mySize = new Size((int)newWidth, (int)newHeight);
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(mySize.Width, mySize.Height);
//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//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.Transparent);
//在指定位置画图
g.DrawImage(myImage, new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height),
new System.Drawing.Rectangle(0, 0, myImage.Width, myImage.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("myohmine",f,b,10,10);
//G.Dispose();
///图片水印
//System.Drawing.Image copyImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath("pic/1.gif"));
//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();
//保存缩略图
int i = fileSaveUrl.LastIndexOf('.');
string name = fileSaveUrl.Substring(0, i);
string exten = fileSaveUrl.Substring(i + 1).ToLower();
ImageFormat format = ImageFormat.Jpeg;
switch (exten)
{
case "png": format = ImageFormat.Png; break;
case "gif": format = ImageFormat.Gif; break;
default: exten = "jpg"; fileSaveUrl = name + ".jpg"; break;
}
if (File.Exists(fileSaveUrl)) { File.Delete(fileSaveUrl); }
if (format == ImageFormat.Jpeg)
{
EncoderParameters encoderParams = new EncoderParameters();
long[] quality = new long[1];
quality[0] = jpgQuality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
encoderParams.Param[0] = encoderParam;
//获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象.
ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo jpegICI = null;
for (int x = 0;
x < arrayICI.Length;
x++)
{
if (arrayICI[x].FormatDescription.Equals("JPEG"))
{
jpegICI = arrayICI[x];
//设置JPEG编码
break;
}
}
bitmap.Save(fileSaveUrl, jpegICI, encoderParams);
}
else
{
bitmap.Save(fileSaveUrl, format);
}
g.Dispose();
myImage.Dispose();
bitmap.Dispose();
return exten;
}
//处理图片上传
var fileCtl = FV.Row.FindControl("fuPicture") as FileUpload;
if (fileCtl.HasFile)
{
//上传图片
string path = (EditPersonalCode == "New" ? EditOrgCode : e.Keys["OrgCode"].ToString()).Replace('.', '/');
string fix = fileCtl.FileName.Substring(fileCtl.FileName.LastIndexOf('.') + 1).ToLower();
if (fix != "jpg" && fix != "png" && fix != "bmp" && fix != "gif")
{
e.Cancel = true;
ShowAlert("请重新选择照片上传\\n错误的图片格式：" + fix);
return;
}
string photoFilePath = Server.MapPath("~/OrgData/") + path;
if (!Directory.Exists(photoFilePath)) //如果不存在就建立
{
Directory.CreateDirectory(photoFilePath);
}
string fname = string.Format("s_{0}_{1}", e.Keys["PersonalCode"], DateTime.Now.TimeOfDay.TotalSeconds);
string newName = string.Format("{0}.{1}", fname, fix);//提示：必须用e.Keys["PersonalCode"]而不是EditPersonalCode
string fullpath = photoFilePath + "\\" + newName;
try
{
fix = Web.Base.ExtendClass.MakeSmallImg(fileCtl.FileContent, fullpath, 180, 240, 100);
}
catch
{
e.Cancel = true;
ShowAlert("无法识别的图片");
return;
}
newName = string.Format("{0}.{1}", fname, fix);//重新改变了后缀
e.NewValues.Add("PhotoFile", path + "/" + newName);
}
