上传图片出错的问题

[昔梦无痕]

有一下代码：

  string imgExt, imgs = "", imgm = "";
        System.Drawing.Image oriImg, newImg;
        string imageSavePath = Server.MapPath("../UpImage/");
        int imageThumbWidth = 0;//小缩略图
        int imageThumbHeight = 0;
        string imageNewName = DateTime.Now.ToString("yyyyMMddHHmmss");
        try
        {
            if (image.Value != "")
            {
                HttpPostedFile PostedFile = image.PostedFile;
                imgExt = System.IO.Path.GetExtension(PostedFile.FileName).ToString().ToLower();
                if (imgExt != ".jpg" && imgExt != ".gif" && imgExt != ".png")
                {
                    MessageBox.Show(this.Page, "上传的文件格式错误");
                    return;
                }
                else
                {
                    imageNewName += imgExt;

                    oriImg = System.Drawing.Image.FromStream(PostedFile.InputStream);
                    if (oriImg.Width < imageThumbWidth && oriImg.Height < imageThumbWidth)
                    {
                        imageThumbHeight = oriImg.Height;
                        imageThumbWidth = oriImg.Width;
                    }
                    else
                    {
                        if (oriImg.Width < oriImg.Height)
                        {
                            imageThumbHeight = imageThumbWidth;
                            imageThumbWidth = imageThumbHeight * oriImg.Width / oriImg.Height;
                        }
                        else if (oriImg.Width > oriImg.Height)
                        {
                            imageThumbHeight = imageThumbWidth * oriImg.Height / oriImg.Width;
                        }
                        else imageThumbHeight = imageThumbWidth;
                    }
                    newImg = oriImg.GetThumbnailImage(imageThumbWidth, imageThumbHeight, null, new System.IntPtr(0));
                    imgs = "o_" + imageNewName;
                    imgm = "t_" + imageNewName;
                    switch (imgExt)
                    {
                        case ".jpg":
                            oriImg.Save(imageSavePath + imgs, System.Drawing.Imaging.ImageFormat.Jpeg);
                            newImg.Save(imageSavePath + imgm, System.Drawing.Imaging.ImageFormat.Jpeg);
                            break;
                        case ".gif":
                            oriImg.Save(imageSavePath + imgs, System.Drawing.Imaging.ImageFormat.Gif);
                            newImg.Save(imageSavePath + imgm, System.Drawing.Imaging.ImageFormat.Gif);
                            break;
                        case ".png":
                            oriImg.Save(imageSavePath + imgs, System.Drawing.Imaging.ImageFormat.Png);
                            newImg.Save(imageSavePath + imgm, System.Drawing.Imaging.ImageFormat.Png);
                            break;
                    }
                    oriImg.Dispose();
                    newImg.Dispose();
                }
            }

执行了出错，ex.Message的报错是：A generic error occurred in GDI+.这是为什么呢？

[MSDNXGH]

全部打个断点，然后看执行，看看那儿错了，

[loveheronly]

protected void btnUpload_Click(object sender, EventArgs e)
{
string type;
if (ddlist.SelectedItem.Value == "")
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('你还没有选择酷信专栏');window.location.href='User.aspx';", true);

return;
}
else
{
type = ddlist.SelectedItem.Value;
ViewState["type"] = type;
ddlist.Enabled = false;
}
Boolean fileOK = true;
if (fUfile.HasFile)
{
if (fileOK)
{
try
{
string Date = System.DateTime.Now.ToString("yyMMddhhmmss");
string subFie = fUfile.FileName.Substring(fUfile.FileName.LastIndexOf("."), 4);
string sLocalPath = "../common/wwjeditor/UploadFiles/";
string folder = Server.MapPath(sLocalPath) + type;

if (!Directory.Exists(folder))
Directory.CreateDirectory(folder);

string path = folder + "\\" + Date + subFie;

string fileName = fUfile.FileName;
int size = fUfile.PostedFile.ContentLength;
// string userName = type;

Multimedia mul = new Multimedia();
mul.Name = fileName;
mul.Size = size;
mul.Path = "common/wwjeditor/UploadFiles/" + type + "/" + Date + subFie;
mul.Series = 1;



//上传到文件夹
sLocalPath = "../common/wwjeditor/UploadFiles/" + type;
path = Server.MapPath(sLocalPath) + "\\" + mul.Path.Substring(mul.Path.LastIndexOf("/") + 1);
if (!File.Exists(path))
{
fUfile.SaveAs(path);
}


if (ViewState["list"] != null)
{
List<Multimedia> list =(List<Multimedia>) ViewState["list"];
mul.Series = list.Count + 1;
list.Add(mul);
gvAccessory.DataSource = list;
gvAccessory.DataBind();
}
else
{
List<Multimedia> list = new List<Multimedia>();
list.Add(mul);
ViewState["list"] = list;
gvAccessory.DataSource = list;
gvAccessory.DataBind();
}

}
catch (System.Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "');</script>");
return;
}
}
}
else
{
Response.Write("<script>alert('上传的文件不符合要求！');</script>");
return;
}

}

[KeepMoving]

加断点，调试吧！

[haojuntu]

调试一下，看看具体是什么问题。

[子夜__]

A generic error occurred in GDI+.

这个不好确定 你换个电脑试试下。
二进制图片显示

上传二进制

if (FileUpLogo.HasFile)
{
  //取得上传文件的大小
  int FileLen = FileUpLogo.PostedFile.ContentLength;
  Byte[] FileData = new Byte[FileLen];
  //创建访问客户端上传文件的对象
  HttpPostedFile hp = FileUpLogo.PostedFile;
  //创建数据流对象
  System.IO.Stream sr = hp.InputStream;
  //将图片数据放到FileData数组对象实例中，0代表数组指针的起始位置,FileLen代表指针的结束位置
  sr.Read(FileData, 0, FileLen);
  //将FileData 赋值给实体
  brandModel.fld_logo = FileData;
}

或者

HttpPostedFile upFile = up_file.PostedFile;//HttpPostedFile对象,用来读取上传图片的属性
            fileLength = upFile.ContentLength;//记录文件的长度
   try
   {
    if(fileLength==0)//当文件长度为0的时候
    {
     txtMessage.Text = "请选择要上传的文件!";
    }
    else
    {
     byte[] fileByte = new byte[fileLength];//用图片的长度来初始化一个字节数组存储临时的图片文件
     Stream fileStream = upFile.InputStream;//建立文件流对象
     fileStream.Read(fileByte,0,fileLength);//读取图片数据到临时存储体fileByte,0为数据指针位置,fileLength为数据长度
     string connString = "Data Source=192.168.1.250;database=image;uid=pwqzc;pwd=cn0088";
     SqlConnection conn = new SqlConnection(connString);//初始化数据库连接
     string insertStr = "insert into image (image_data,image_content_type,image_description,image_size) values (@image_data,@image_content_type,@image_description,@image_size)";
     //插入数据库语句
     SqlCommand comm = new SqlCommand(insertStr,conn);
     comm.Parameters.Add(new SqlParameter("@image_data",SqlDbType.Image));//添加参数
     comm.Parameters["@image_data"].Value = fileByte;//给参数赋值
     comm.Parameters.Add(new SqlParameter("@image_content_type",SqlDbType.VarChar,50));
     comm.Parameters["@image_content_type"].Value = upFile.ContentType;//记录图片类型
     comm.Parameters.Add(new SqlParameter("@image_description",SqlDbType.VarChar,50));
     comm.Parameters["@image_description"].Value = txtDescription.Text;//把其他的表单数据上传
     comm.Parameters.Add(new SqlParameter("@image_size",SqlDbType.Int,4));
     comm.Parameters["@image_size"].Value = upFile.ContentLength;//记录图片长度,读取数据的时候使用
     conn.Open();//打开数据库连接
     comm.ExecuteNonQuery();//添加数据
     conn.Close();//关闭数据库
     txtMessage.Text = "你已经成功的上传了图片";
    }
   }
   catch(Exception ex)
   {
       txtMessage.Text = ex.Message.ToString();
   }
  }
 }

读取

using(SqlConnection conn=new SqlConnection())  
{  
conn.ConnectionString="";  
   
string strSql="select * from Tb where Id='"+Id+"'";  
SqlCommand cmd=new SqlCommand(strSql,conn) ;  
conn.Open();  
SqlDataReader reader=cmd.ExecuteReader();  
   
if(reader.Read())  
{  
Response.ContentType = "application/octet-stream";  
Response.BinaryWrite((Byte[])reader["Photo"]);  
}  
Response.End();  
conn.Close();  
} 

[lijing3333]

如果不是文件夹权限的问题话，就是原来获取的图片对象没有完全释放，再次引用但是图片已经锁定。所以照成冲突。 如果原图跟说缩略图不是一个文件夹的话 就没问题 如果在一个文件夹 想覆盖原文件就会出错。
你参考我的代码 从新创建一个imge对象进行saveas() 你的代码我就不仔细看了。

public void CreateMinImageAndDel(string originalImagePath, string thumbnailPath, int width, int height)
        {
            Graphics draw = null;
            string FileExt = "";

            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(originalImagePath));

            int towidth = width;
            int toheight = height;

            int ow = originalImage.Width;
            int oh = originalImage.Height;

            //新建一个bmp图片
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
            System.Drawing.Image bitmap2 = new System.Drawing.Bitmap(towidth, toheight);
            //新建一个画板
            System.Drawing.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.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight));

            try
            {
                //以jpg格式保存缩略图
                FileExt = Path.GetFileNameWithoutExtension(originalImagePath);
　　　　　　　　　　//用新建立的image对象拷贝bitmap对象 让g对象可以释放资源
                draw = Graphics.FromImage(bitmap2);
                draw.DrawImage(bitmap, 0, 0);

            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
　　　　　　　　　　//保存调整在这里即可
                bitmap2.Save(HttpContext.Current.Server.MapPath(thumbnailPath) + FileExt + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
            }
        }