/// <summary>
/// 图片等比缩放
/// </summary>
/// <param name="postedfile">原图</param>
/// <param name="savepath">缩略图存放地址</param>
/// <param name="targetwidth">指定的最大宽度</param>
/// <param name="targetheight">指定的最大高度</param>
public static void zoomauto(string initpath, string savepath, double targetwidth, double targetheight)
{
try
{
//创建目录
string dir = Path.GetDirectoryName(savepath);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
Image initimage = Image.FromFile(initpath);
//原图宽高均小于模版，不作处理，直接保存
if (initimage.Width <= targetwidth && initimage.Height <= targetheight)
{
//保存
initimage.Save(savepath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
else
{
//缩略图宽、高计算
double newwidth = initimage.Width;
double newheight = initimage.Height;
//宽大于高或宽等于高（横图或正方）
if (initimage.Width > initimage.Height || initimage.Width == initimage.Height)
{
//如果宽大于模版
if (initimage.Width > targetwidth)
{
//宽按模版，高按比例缩放
newwidth = targetwidth;
newheight = initimage.Height * (targetwidth / initimage.Width);
}
}
//高大于宽（竖图）
else
{
//如果高大于模版
if (initimage.Height > targetheight)
{
//高按模版，宽按比例缩放
newheight = targetheight;
newwidth = initimage.Width * (targetheight / initimage.Height);
}
}
//生成新图
//新建一个bmp图片
Image newimage = new Bitmap((int)newwidth, (int)newheight);
//新建一个画板
Graphics newg = Graphics.FromImage(newimage);
//设置质量
newg.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
newg.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//置背景色
newg.Clear(Color.Transparent);
//画图
newg.DrawImage(initimage, new Rectangle(0, 0, newimage.Width, newimage.Height), new Rectangle(0, 0, initimage.Width, initimage.Height), GraphicsUnit.Pixel);
//保存缩略图
newimage.Save(savepath, System.Drawing.Imaging.ImageFormat.Png);
//释放资源
newg.Dispose();
newimage.Dispose();
initimage.Dispose();
}
}
catch (Exception e)
{
LogHelper.WriteLog(e.Message, "PicHelper.zoomauto");
throw;
}
}
private void ProcDownload()
{
evtPerDonwload = new ManualResetEvent(false);
foreach (DownloadFileInfo file in this.downloadFileList)
{
total += file.Size;
}
while (!evtDownload.WaitOne(0, false))
{
if (this.downloadFileList.Count == 0)
{
break;
}
DownloadFileInfo file = this.downloadFileList[0];
LogHelper.Debug(String.Format("Start Download:{0}", file.FileName));
//Debug.WriteLine(String.Format("Start Download:{0}", file.FileName));
this.ShowCurrentDownloadFileName(file.FileName);
//下载
clientDownload = new WebClient();
clientDownload.DownloadProgressChanged += new DownloadProgressChangedEventHandler(OnDownloadProgressChanged);
clientDownload.DownloadFileCompleted += new AsyncCompletedEventHandler(OnDownloadFileCompleted);
evtPerDonwload.Reset();
try
{
/*
* 断目录存在不，不存的则添加
* **/
string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, file.FileFullName);
if (!File.Exists(path))
{
Directory.CreateDirectory(Path.GetDirectoryName(path));
}
clientDownload.DownloadFileAsync(new Uri(file.DownloadUrl), path + ".tmp", file);
}
catch (Exception ex)
{
LogHelper.Error(string.Format("DownloadFileFailed：DownloadUrl【{2}】,FileName【{0}】,error Msg【{1}】", file.FileFullName, ex.Message, file.DownloadUrl));
}
//等待下载完成
evtPerDonwload.WaitOne();
clientDownload.Dispose();
clientDownload = null;
//移除已下载的文件
this.downloadFileList.Remove(file);
}
LogHelper.Debug("All Downloaded");
//Debug.WriteLine("All Downloaded");
if (this.downloadFileList.Count == 0)
{
Exit(true);
}
else
{
Exit(false);
}
evtDownload.Set();
}
