/// <summary>
/// 下载图片
/// </summary>
/// <param name="picUrl">图片Http地址</param>
/// <param name="savePath">保存路径</param>
/// <param name="timeOut">Request最大请求时间，如果为-1则无限制</param>
///<param name="actualFilePath">压缩之后保存路径（不压缩就不用传参）</param>
/// <param name="userId">用户ID</param>
/// <returns></returns>
public static string DownloadPicture(string picUrl, string savePath, int timeOut = -1, string actualFilePath = "", string userId = "")
{
var value = "";
WebResponse response = null;
Stream stream = null;
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(picUrl);
if (timeOut != -1)
{
request.Timeout = timeOut;
}
response = request.GetResponse();
stream = response.GetResponseStream();
if (!response.ContentType.ToLower().StartsWith("Text/"))
{
var isResult = SaveBinaryFile(response, savePath);
if (isResult)
{
if (!string.IsNullOrEmpty(actualFilePath))
{
value = GetPicThumbnail(savePath, actualFilePath, 50, 50, 96, userId);
if (File.Exists(savePath) && !PublicTalkMothed.IsFileInUsing(savePath))
{
File.Delete(savePath);
}
}
}
}
}
catch
{
return(value);
}
finally
{
stream?.Close();
response?.Close();
}
return(value);
}
/// 无损压缩图片
/// <param name="sFile">原图片</param>
/// <param name="dFile">压缩后保存位置</param>
/// <param name="dHeight">高度</param>
/// <param name="dWidth"></param>
/// <param name="flag">压缩质量(数字越小压缩率越高) 1-100</param>
/// <returns></returns>
public static string GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth, int flag, string userID = "")
{
System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
ImageFormat tFormat = iSource.RawFormat;
int sW = 0, sH = 0;
if (iSource.Width > 50 || iSource.Height > 50)
{
//按比例缩放
System.Drawing.Size tem_size = new System.Drawing.Size(iSource.Width, iSource.Height);
if (tem_size.Width > dHeight || tem_size.Width > dWidth)
{
if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth))
{
sW = dWidth;
sH = (dWidth * tem_size.Height) / tem_size.Width;
}
else
{
sH = dHeight;
sW = (tem_size.Width * dHeight) / tem_size.Height;
}
}
else
{
sW = tem_size.Width;
sH = tem_size.Height;
}
Bitmap ob = new Bitmap(dWidth, dHeight);
Graphics g = Graphics.FromImage(ob);
g.Clear(Color.WhiteSmoke);
g.CompositingQuality = CompositingQuality.HighQuality;
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width,
iSource.Height, GraphicsUnit.Pixel);
g.Dispose();
//以下代码为保存图片时，设置压缩质量
EncoderParameters ep = new EncoderParameters();
long[] qy = new long[1];
qy[0] = flag; //设置压缩的比例1-100
EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
ep.Param[0] = eParam;
try
{
ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo jpegICIinfo = null;
for (int x = 0; x < arrayICI.Length; x++)
{
if (arrayICI[x].FormatDescription.Equals("JPEG"))
{
jpegICIinfo = arrayICI[x];
break;
}
}
FileInfo fileInfo = new FileInfo(sFile);
var saveFile = dFile + fileInfo.Name;
if (File.Exists(saveFile))
{
return(saveFile);
}
if (jpegICIinfo != null)
{
ob.Save(saveFile, jpegICIinfo, ep); //dFile是压缩后的新路径
}
else
{
ob.Save(dFile, tFormat);
}
//var tempUserImage = GlobalVariable.UserImages.FirstOrDefault(m => m.UserID == userId);
//if (tempUserImage == null)
// GlobalVariable.UserImages.Add(new GlobalVariable.ContactUserImage
// {
// Url = saveFile,
// UserID = userId
// });
return(saveFile);
}
catch
{
return(string.Empty);
}
finally
{
iSource.Dispose();
ob.Dispose();
}
}
else
{
FileInfo fileInfo = new FileInfo(sFile);
var extension = Path.GetExtension(sFile);
var saveFile = dFile + fileInfo.Name;
if (!File.Exists(sFile) && !PublicTalkMothed.IsFileInUsing(saveFile))
{
File.Move(sFile, saveFile);
}
//var tempUserImage = UserImages.FirstOrDefault(m => m.UserID == userId);
//if (tempUserImage == null)
// UserImages.Add(new GlobalVariable.ContactUserImage
// {
// Url = saveFile,
// UserID = userId
// });
return(saveFile);
}
}