关于文件上传使用wcf 异步传输 - 黑马程序员技术交流社区

[WebMethod]
public void StoreFileAdvanced(string fileName, string fileNamex, byte[] data, int dataLength, string parameters, bool firstChunk, bool lastChunk, string path, int w, int h, string lei1, string lei2, string Pathparent)
{
string uploadFolder = Pathparent;
string tempFileName=fileName;//大文件名
string tempFileNamex=fileNamex;//小文件名
string webpath=@HostingEnvironment.ApplicationPhysicalPath;
string fileUrlPath = webpath + "/" + uploadFolder + "/" + path + "/" + DateTime.Now.ToString("yyyyMM");//文件要存储路径
if (firstChunk)
{
if (!Directory.Exists(fileUrlPath))
{
Directory.CreateDirectory(fileUrlPath); //创建文件夹
}
//Delete temp file
if (File.Exists(fileUrlPath + "/" + fileName))
File.Delete(fileUrlPath + "/" + fileName);
//Delete target file
if (File.Exists(fileUrlPath + "/" + fileNamex))
File.Delete(fileUrlPath + "/" + fileNamex);
}
FileStream fs = File.Open(fileUrlPath + "/" + fileName, FileMode.Append);
fs.Write(data, 0, dataLength);
fs.Close();
if (lastChunk)
{
if (w == 0 || h == 0)
{
}
else
{
if (tempFileName.IndexOf(".jpg") > -1 || tempFileName.IndexOf(".png") > -1 || tempFileName.IndexOf(".bmp") > -1 || tempFileName.IndexOf(".gif") > -1)
{
try
{
MakeThumbnail(fileUrlPath + "/" + tempFileName, fileUrlPath + "/" + tempFileNamex, w, h);
}
catch (Exception ex)
{
//Delete temp file
if (File.Exists(fileUrlPath + "/" + fileName))
File.Delete(fileUrlPath + "/" + fileName);
//Delete target file
if (File.Exists(fileUrlPath + "/" + fileNamex))
File.Delete(fileUrlPath + "/" + fileNamex);
MakeThumbnail(fileUrlPath + "/" + tempFileName, fileUrlPath + "/" + tempFileNamex, w, h);
}
}
}
}
}

复制代码

_client = new uploadSoapClient();
_client.StoreFileAdvancedCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(_client_StoreFileAdvancedCompleted);
　　 void _client_StoreFileAdvancedCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
{
//检查WEB服务是否存在错误
if (e.Error != null)
{
//当错误时放弃上传
_file.State = Constants.FileStates.错误;
}
else
{
//如果文件未取消上传的话，则继续上传
if (!_file.IsDeleted)
UploadAdvanced();
}
}
　　private void UploadAdvanced()
{
// _file 这里是一个文件对像
byte[] buffer = new byte[4096*4];
int bytesRead = _file.FileStream.Read(buffer, 0, buffer.Length);
//文件是否上传完毕?
if (bytesRead != 0)
{
_dataSent += bytesRead;
if (_dataSent == _dataLength)
_lastChunk = true;//是否是最后一块数据
//上传当前数据块
_client.StoreFileAdvancedAsync(_file.FileName,_file.FileNamex, buffer, bytesRead, _initParams, _firstChunk, _lastChunk,_file.Path,_file.W,_file.H,_file.Lei1,_file.Lei2,_file.Pathparent);
//在第一条消息之后一直为false
_firstChunk = false;
//通知上传进度修改
OnProgressChanged();
}
else
{
//当上传完毕后
_file.FileStream.Dispose();
_file.FileStream.Close();
_client.ChannelFactory.Close();
}
}

复制代码

protected virtual void MakeThumbnail(string originalImagePath, string thumbnailPath, int width1, int height1)
{
System.Drawing.Image original_image = System.Drawing.Image.FromFile(originalImagePath);
// Calculate the new width and height
int width = original_image.Width;
int height = original_image.Height;
int target_width = width1;
int target_height = height1;
int new_width, new_height;
float target_ratio = (float)target_width / (float)target_height;
float image_ratio = (float)width / (float)height;
if (target_ratio > image_ratio)
{
new_height = target_height;
new_width = (int)Math.Floor(image_ratio * (float)target_height);
}
else
{
new_height = (int)Math.Floor((float)target_width / image_ratio);
new_width = target_width;
}
new_width = new_width > target_width ? target_width : new_width;
new_height = new_height > target_height ? target_height : new_height;
int paste_x = 0; //(target_width - new_width) / 2;
int paste_y = 0; //(target_height - new_height) / 2;
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(new_width, new_height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
//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(System.Drawing.Color.White);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(original_image, paste_x, paste_y, new_width, new_height);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
original_image.Dispose();
bitmap.Dispose();
g.Dispose();
}
}

复制代码