using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class SystemManage_signation2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            string id = Request.QueryString["ID"];
            if (string.IsNullOrEmpty(id))
                id = ZWL.Common.PublicMethod.GetSessionValue("UserID");
            ZWL.BLL.ERPUser bll = new ZWL.BLL.ERPUser();
            pic.ImageUrl = bll.GetSignation(id);
        }
    }

    protected void btn_upload_Click(object sender, EventArgs e)
    {
        string id = Request.QueryString["ID"];
        if (string.IsNullOrEmpty(id))
            id = ZWL.Common.PublicMethod.GetSessionValue("UserID");

        Boolean fileOk = false;
        if (pic_upload.HasFile)//验证是否包含文件
        {
            //取得文件的扩展名,并转换成小写
            string fileExtension = Path.GetExtension(pic_upload.FileName).ToLower();
            //验证上传文件是否图片格式
            fileOk = IsImage(fileExtension);

            if (fileOk)
            {
                //对上传文件的大小进行检测，限定文件最大不超过8M
                if (pic_upload.PostedFile.ContentLength < 8192000)
                {
                    string filepath = "/signation/";
                    string filename = Guid.NewGuid().ToString();
                    if (Directory.Exists(Server.MapPath(filepath)) == false)//如果不存在就创建file文件夹
                    {
                        Directory.CreateDirectory(Server.MapPath(filepath));
                    }
                    string virpath = filepath + filename + fileExtension;//这是存到服务器上的虚拟路径
                    string mappath = Server.MapPath(virpath);//转换成服务器上的物理路径
                    pic_upload.PostedFile.SaveAs(mappath);//保存图片
                                                          //显示图片
                    bool flag = new ZWL.BLL.ERPUser().SetSignation(id, virpath);
                    if (flag)
                    {
                        pic.ImageUrl = virpath;
                        lbl_pic.Text = "修改成功";
                    }
                    else
                    {
                        pic.ImageUrl = virpath;
                        lbl_pic.Text = "修改失败";
                    }
                }
                else
                {
                    pic.ImageUrl = "";
                    lbl_pic.Text = "文件大小超出8M！请重新选择！";
                }
            }
            else
            {
                pic.ImageUrl = "";
                lbl_pic.Text = "要上传的文件类型不对！请重新选择！";
            }
        }
        else
        {
            pic.ImageUrl = "";
            lbl_pic.Text = "请选择要上传的图片！";
        }
    }

    /// <summary>
    /// 验证是否指定的图片格式
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public bool IsImage(string str)
    {
        bool isimage = false;
        string thestr = str.ToLower();
        //限定只能上传jpg和gif图片
        string[] allowExtension = { ".jpg", ".gif", ".bmp", ".png" };
        //对上传的文件的类型进行一个个匹对
        for (int i = 0; i < allowExtension.Length; i++)
        {
            if (thestr == allowExtension[i])
            {
                isimage = true;
                break;
            }
        }
        return isimage;
    }
}