C# exif 信息

C# exif 信息

public void FindExifinfo(string filePath)
{

            Image img = Image.FromFile(filePath);

            PropertyItem[] pt = img.PropertyItems;

            for (int i = 0; i < pt.Length; i++)

            {
PropertyItem p = pt[i];             

                switch (pt[i].Id)

{  // 设备制造商 20.  

                    case 0x010F:

                        this.textBox1.Text = System.Text.ASCIIEncoding.ASCII.GetString(pt[i].Value);

                        break;            
case 0x0110: // 设备型号 25.  

                        this.textBox4.Text = GetValueOfType2(p.Value);

                        break;

                    case 0x0132: // 拍照时间 30.

                        this.textBox2.Text = GetValueOfType2(p.Value);

                        break;          

                    case 0x829A: // .曝光时间  

    this.textBox3.Text = GetValueOfType5(p.Value)+" sec";

                        break;
                  case 0x8827: // ISO 40.   

                        this.textBox5.Text = GetValueOfType3(p.Value);

                        break;

                    case 0x010E: // 图像说明info.description

                        this.textBox6.Text = GetValueOfType2(p.Value);

                        break;

                    case 0x920a: //相片的焦距

                        this.textBox7.Text = GetValueOfType5A(p.Value) + " mm";

                        break;
                    case 0x829D: //相片的光圈值

                        this.textBox8.Text = GetValueOfType5A(p.Value);

                        break;

                    default:

                        break; 

} 

      }

}

public string GetValueOfType2(byte[] b)// 对type=2 的value值进行读取

        {

            return System.Text.Encoding.ASCII.GetString(b);

        }

private static string GetValueOfType3(byte[] b) //对type=3 的value值进行读取

        {

            if (b.Length != 2) return "unknow";

            return Convert.ToUInt16(b[1] << 8 | b[0]).ToString();

        }

       private static string GetValueOfType5(byte[] b) //对type=5 的value值进行读取

        {

            if (b.Length != 8) return "unknow";

            UInt32 fm, fz;

            fm = 0;

            fz = 0;

            fz = Convert.ToUInt32(b[7] << 24 | b[6] << 16 | b[5] << 8 | b[4]);

            fm = Convert.ToUInt32(b[3] << 24 | b[2] << 16 | b[1] << 8 | b[0]);

            return fm.ToString() + "/" + fz.ToString()+" sec";

        }

private static string GetValueOfType5A(byte[] b)//获取光圈的值

        {

            if (b.Length != 8) return "unknow";

            UInt32 fm, fz;

            fm = 0;

            fz = 0;

            fz = Convert.ToUInt32(b[7] << 24 | b[6] << 16 | b[5] << 8 | b[4]);

            fm = Convert.ToUInt32(b[3] << 24 | b[2] << 16 | b[1] << 8 | b[0]);

            double temp = (double)fm / fz;

            return (temp).ToString();

        }