/// <summary>
/// 將圖片轉正 (透過手機上傳的圖片，有可能不是正的)
/// </summary>
public Stream CorrectOrientation(MemoryStream imageStream)
{
global::System.Drawing.Image image = global::System.Drawing.Image.FromStream(imageStream);
if (image.PropertyIdList.Contains(0x0112))
{
int rotation = image.GetPropertyItem(0x0112).Value[0];
switch (rotation)
{
case 1: // landscape, do nothing
break;
case 8: // rotated 90 right
// de-rotate:
image.RotateFlip(rotateFlipType: RotateFlipType.Rotate270FlipNone);
break;
case 3: // bottoms up
image.RotateFlip(rotateFlipType: RotateFlipType.Rotate180FlipNone);
break;
case 6: // rotated 90 left
image.RotateFlip(rotateFlipType: RotateFlipType.Rotate90FlipNone);
break;
}
return(image.ToStream());
}
return(imageStream);
}
public static byte[] GetBytes(global::System.Drawing.Image image)
{
MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
return(stream.ToArray());
}
public static string GenerateBarCode(string id)
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeScale = 4;
// qrCodeEncoder.QRCodeVersion = 4;
qrCodeEncoder.QRCodeVersion = 0;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
//System.Drawing.Image image = qrCodeEncoder.Encode("4408810820 深圳－广州 小江");
global::System.Drawing.Image image = qrCodeEncoder.Encode(id);
string filename = Guid.NewGuid().ToString() + ".jpg";
string fileMonthPath = System.Web.HttpContext.Current.Server.MapPath(@"~\UploadFile") + "\\" + DateTime.Now.ToString("yyyyMM");
if (!System.IO.Directory.Exists(fileMonthPath))
{
System.IO.Directory.CreateDirectory(fileMonthPath);
}
string filepath = fileMonthPath + "\\" + filename;
global::System.IO.FileStream fs = new global::System.IO.FileStream(filepath, global::System.IO.FileMode.OpenOrCreate, global::System.IO.FileAccess.Write);
image.Save(fs, global::System.Drawing.Imaging.ImageFormat.Jpeg);
fs.Close();
image.Dispose();
return(@"../../UploadFile/" + DateTime.Now.ToString("yyyyMM") + "/" + filename);
}
/// <summary>
/// 直接將 System.Drawing.Image 轉為 Stream
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Stream ToStream(this global::System.Drawing.Image image)
{
var ms = new MemoryStream();
image.Save(ms, ImageFormat.Jpeg);
ms.Position = 0;
return(ms);
}
/// <summary>
/// Saves the encoded image to a file
/// </summary>
/// <param name="image">The image to save</param>
/// <param name="quality">The quality desired (a value between 1 and 100).</param>
/// <param name="format">The <see cref="T:System.Drawing.Imaging.ImageFormat" /> to save the image as.</param>
/// <param name="fileName">The file path to save the image to.</param>
public static void ToFile(global::System.Drawing.Image image, long quality, ImageFormat format, string fileName)
{
using (Stream stream = ToStream(image, quality, format))
{
using (FileStream stream2 = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
stream.Position = 0L;
byte[] buffer = new byte[stream.Length];
int count = stream.Read(buffer, 0, (int)stream.Length);
stream2.Write(buffer, 0, count);
stream2.Flush();
}
}
}
/// <summary>
/// Saves the encoded image to a stream.
/// </summary>
/// <param name="image">The image to save</param>
/// <param name="quality">The quality desired (a value between 1 and 100).</param>
/// <param name="format">The <see cref="T:System.Drawing.Imaging.ImageFormat" /> to save the image as.</param>
/// <returns></returns>
public static Stream ToStream(global::System.Drawing.Image image, long quality, ImageFormat format)
{
MemoryStream stream = new MemoryStream();
ImageCodecInfo encoder = null;
foreach (ImageCodecInfo info2 in ImageCodecInfo.GetImageEncoders())
{
if (info2.MimeType == "image/jpeg")
{
encoder = info2;
}
}
EncoderParameter parameter = new EncoderParameter(Encoder.Quality, quality);
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = parameter;
image.Save(stream, encoder, encoderParams);
return(stream);
}
/// <summary>
/// Captures a screenshot of the window associated with the handle argument.
/// </summary>
/// <param name="handle">Used to determine which window to provide a screenshot for.</param>
/// <returns>Screenshot of the window corresponding to the handle argument.</returns>
public static global::System.Drawing.Image CaptureWindow(IntPtr handle)
{
IntPtr windowDC = NativeMethods.GetWindowDC(handle);
IntPtr hDC = NativeMethods.CreateCompatibleDC(windowDC);
NativeMethods.RECT rect = new NativeMethods.RECT();
NativeMethods.GetWindowRect(handle, ref rect);
int nWidth = rect.right - rect.left;
int nHeight = rect.bottom - rect.top;
IntPtr hObject = NativeMethods.CreateCompatibleBitmap(windowDC, nWidth, nHeight);
IntPtr ptr4 = NativeMethods.SelectObject(hDC, hObject);
NativeMethods.BitBlt(hDC, 0, 0, nWidth, nHeight, windowDC, 0, 0, 0xcc0020);
NativeMethods.SelectObject(hDC, ptr4);
NativeMethods.DeleteDC(hDC);
NativeMethods.ReleaseDC(handle, windowDC);
global::System.Drawing.Image image = global::System.Drawing.Image.FromHbitmap(hObject);
NativeMethods.DeleteObject(hObject);
return(image);
}
/// <summary>
/// 判斷一個串流是哪種影像格式，可傳回 jpg, bmp, gif, png，若不是影像，則傳回空字串
/// </summary>
/// <param name="strm"></param>
/// <returns></returns>
public static string GetImageFormat(this Stream strm)
{
// 讀取之前，先回到第一位元
strm.Position = 0;
// 只讀取前面兩個位元組
byte[] buffer = new byte[2];
strm.Read(buffer, 0, 2);
// 將兩 bytes 資料轉成易讀的 16 進位
string header = Convert.ToString(buffer[0], 16) + Convert.ToString(buffer[1], 16);
// 第一次判斷圖檔格式
string format;
switch (header.ToUpper())
{
case "FFD8":
format = "jpg";
break;
case "424D":
format = "bmp";
break;
case "4749":
format = "gif";
break;
case "8950":
format = "png";
break;
default:
format = "";
break;
}
// 先從最前面幾個位元組初步判斷格式後，為避免有些檔案是利用這個技巧刻意偽裝成圖檔，所以再進一步檢查
if (format != "")
{
global::System.Drawing.Image img = null;
try
{
img = global::System.Drawing.Image.FromStream(strm);
}
catch (Exception)
{
// 會出錯代表它其實不是圖檔，而是有刻意偽裝過的
format = "";
}
finally
{
if (img != null)
{
img.Dispose();
}
img = null;
}
}
return(format);
}
