项目中有个需求：用winform维护web服务器端的数据，其中需要添加图片，且图片上传需要考虑手机端，要将图片压缩后存在另个文件夹下由手机端调用，以此减轻手机端的数据量过大的负担。
实现思路如下：1.用webservice作为winform的数据层对web服务器数据进行维护；2.webservice中添加如下代码由winform调用：
#region---上传图片---
/// <summary>
///
/// </summary>
/// <param name="content"></param>
/// <param name="pathandname"></param>
/// <returns></returns>
[WebMethod]
public int UpLoadFile(byte[] content, string pathandname)
{
int result = -2;//-2，未知错误，-1上传失败，1web图片上传成功但手机图片未成功上传，2web和手机图片都上传成功。
try
{
string phonePicturePath = ConfigurationManager.AppSettings["phonePicturePath"];
int percentage = Convert.ToInt32(ConfigurationManager.AppSettings["percentage"]);
int index = pathandname.LastIndexOf(".");
if (index == 0)
{
result = -1;
}
else
{
string extended = string.Empty;
if (index + 1 == pathandname.Length)
{
result = -1;
}
else
{
extended = pathandname.Substring(index + 1);
if (extended == "jpeg" || extended == "gif" || extended == "jpg" || extended == "png")
{
try
{
File.WriteAllBytes(Server.MapPath(pathandname), content);//web上传成功
result = 1;
phonePicturePath += pathandname.Substring(pathandname.LastIndexOf('/'));
if (GetPicThumbnail(pathandname, phonePicturePath, percentage))//全部上传成功
{
result = 2;
}
}
catch (Exception ex)
{
result = -1;
}
}
else
{
result = -1;
}
}
}
}
catch (Exception ex)
{
result = -1;
}
return result;
}
/// <summary>
/// 压缩图片
/// </summary>
/// <param name="sFile">文件路径</param>
/// <param name="outPath">存放路径</param>
/// <param name="flag">压缩比率</param>
/// <returns>Boolean</returns>
[WebMethod]
public bool GetPicThumbnail(string sFile, string outPath, int flag)
{
System.Drawing.Image iSource = System.Drawing.Image.FromFile(Server.MapPath(sFile));
ImageFormat tFormat = iSource.RawFormat;
//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;
}
}
if (jpegICIinfo != null)
{
iSource.Save(Server.MapPath(outPath), jpegICIinfo, ep);//dFile是压缩后的新路径
}
else
{
iSource.Save(outPath, tFormat);
}
return true;
}
catch
{
return false;
}
finally
{
iSource.Dispose();
iSource.Dispose();
}
}
#endregion
3.然后winform端代码如下：
private void btnCommonFile_Click(object sender, EventArgs e)
{
OpenFileDialog fileDialog = new OpenFileDialog();
if (fileDialog.ShowDialog() == DialogResult.OK)
{
string extension = Path.GetExtension(fileDialog.FileName);
string[] str = new string[] { ".gif", ".jpeg", ".jpg", "png" };
if (!str.Contains(extension))
{
MessageBox.Show("仅能上传gif，jpeg，jpg，png格式的图片！");
}
else
{
FileInfo fileInfo = new FileInfo(fileDialog.FileName);
if (fileInfo.Length > (FILE_SIZE * 1024) * 1024)
{
MessageBox.Show("上传的图片不能大于5MB");
}
else
{
Stream file = fileDialog.OpenFile();
byte[] bytes = new byte[file.Length];
file.Read(bytes, 0, bytes.Length);
DateTime time = DateTime.Now;
//重命名图片的名称与路径
string path_name = "/images/" + time.ToString("yyyyMMddHHmmss") + extension;
if (tb.UploadFile(bytes, path_name, extension) != "-1")
{
MessageBox.Show("上传功能！");
this.txtpicture.Text = path_name;
}
}
}
}
}
4.至此全部工作做完。