/// <summary>
/// Makes the thumbnail image.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <returns></returns>
private string MakeThumbnailImage(string fileName)
{
//如果上傳圖片寬度大於 maxWidth，確定儲存上傳圖片就要做縮圖動作
string tempFileName = fileName;
int uploadImageWidth = 0;
int uploadImageHeight = 0;
using (Bitmap bitmap = new Bitmap(string.Format(@"{0}\{1}", this.UploadPath, tempFileName)))
{
uploadImageWidth = bitmap.Width;
uploadImageHeight = bitmap.Height;
if (uploadImageWidth > this.MaxWidth || uploadImageHeight > this.MaxHeight)
{
// 計算維持比例的縮圖大小
int[] thumbnailScale = this.GetThumbnailImageScale(this.MaxWidth, this.MaxHeight, uploadImageWidth, uploadImageHeight);
// 產生縮圖
System.Drawing.Image imgThumbnail = System.Drawing.Image.FromFile(string.Format(@"{0}\{1}", this.UploadPath, tempFileName), false);
System.Drawing.Image hb = new System.Drawing.Bitmap(thumbnailScale[0], thumbnailScale[1]);
System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(hb);
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.DrawImage(imgThumbnail, new Rectangle(0, 0, thumbnailScale[0], thumbnailScale[1]), 0, 0, imgThumbnail.Width, imgThumbnail.Height, GraphicsUnit.Pixel);
//存檔
fileName = String.Concat(MiscUtility.MakeGuid().Replace("-", string.Empty).Substring(0, 20), ".jpg");
hb.Save(string.Format(@"{0}\{1}", this.UploadPath.Replace("~", ""), fileName));
graphics.Dispose();
hb.Dispose();
imgThumbnail.Dispose();
}
}
return(fileName);
}
//=========================================================================================
// Upload Image
#region -- ProcessUploadImage --
/// <summary>
/// Processes the upload image.
/// </summary>
/// <param name="uploadFile">The upload file.</param>
/// <returns></returns>
public Dictionary <string, string> ProcessUploadImage(HttpPostedFileBase uploadFile)
{
var jo = new Dictionary <string, string>();
if (uploadFile.ContentLength <= 0)
{
jo.Add("result", "error");
jo.Add("msg", "無內容檔案！請重新選擇檔案！");
return(jo);
}
else if (uploadFile.ContentLength >= MaxRequestLength)
{
//容量超過指定的上限, 預設 10M (10240KB)
string limitLength = string.Empty;
if (this.MaxRequestLength >= (1024 * 1024))
{
limitLength = string.Concat((this.MaxRequestLength / (1024 * 1024)).ToString(), " Mb");
}
else if ((this.MaxRequestLength / (1024 * 1024)) < 1)
{
limitLength = string.Concat((this.MaxRequestLength / 1024).ToString(), " Kb");
}
jo.Add("result", "error");
jo.Add("msg", string.Format("上傳檔案不可超過 {0}！請重新選擇檔案！", limitLength));
return(jo);
}
else
{
if (!IsImage(uploadFile))
{
jo.Add("result", "error");
jo.Add("msg", "上傳檔案並不是圖片檔！請重新選擇檔案！");
return(jo);
}
// Picture Image_Type
var imageTypes = new string[] { "jpg", "jpeg", "png", "gif" };
if (!imageTypes.Contains(Path.GetExtension(uploadFile.FileName).Substring(1, 3).ToLower()))
{
jo.Add("result", "error");
jo.Add("msg", "上傳檔案的圖片檔只能接受 jpg, jpeg, png, gif！請重新選擇檔案！");
return(jo);
}
try
{
//存檔
string fileName = String.Concat(MiscUtility.MakeGuid().Replace("-", string.Empty).Substring(0, 20), Path.GetExtension(uploadFile.FileName).ToLower());
uploadFile.SaveAs(string.Format(@"{0}\{1}", this.UploadPath, fileName));
jo.Add("result", "Success");
jo.Add("msg", fileName);
}
catch (Exception ex)
{
jo.Add("result", "Failure");
jo.Add("msg", ex.Message);
}
return(jo);
}
}
//=========================================================================================
// Crop Image
#region -- ProcessImageCrop --
/// <summary>
/// Processes the image crop.
/// </summary>
/// <param name="currentImage">The current image.</param>
/// <param name="sectionValue">The section value.</param>
/// <returns></returns>
public Dictionary <string, string> ProcessImageCrop(
UploadImage currentImage,
int[] sectionValue)
{
var result = new Dictionary <string, string>();
try
{
//取得裁剪的區域座標
int sectionX1 = sectionValue[0];
int sectionX2 = sectionValue[1];
int sectionY1 = sectionValue[2];
int sectionY2 = sectionValue[3];
//取得裁剪的圖片寬高
int width = sectionX2 - sectionX1;
int height = sectionY2 - sectionY1;
//讀取原圖片
System.Drawing.Image sourceImage = System.Drawing.Image.FromFile
(
string.Format(@"{0}\{1}", this.OriginalPath, currentImage.OriginalImage)
);
//從原檔案取得裁剪圖片
System.Drawing.Image cropImage = this.CropImage(
sourceImage,
new Rectangle(sectionX1, sectionY1, width, height)
);
//將採剪下來的圖片做縮圖處理
Bitmap resizeImage = this.ResizeImage(cropImage, new Size(this.CropWidth, this.CropHeight));
//將縮圖處理完成的圖檔儲存為JPG格式
string fileName = String.Concat(MiscUtility.MakeGuid().Replace("-", string.Empty).Substring(0, 20), ".jpg");
string savePath = string.Format(@"{0}\{1}", this.CropPath, fileName);
SaveJpeg(savePath, resizeImage, 100L);
//釋放檔案資源
resizeImage.Dispose();
cropImage.Dispose();
sourceImage.Dispose();
//如果有之前的裁剪圖片，暫存既有的裁剪圖片檔名
string oldCropImageFileName = string.Empty;
if (!string.IsNullOrWhiteSpace(currentImage.CropImage))
{
oldCropImageFileName = currentImage.CropImage;
}
//JSON
result.Add("result", "Success");
result.Add("OriginalImage", currentImage.OriginalImage);
result.Add("CropImage", fileName);
result.Add("OldCropImage", oldCropImageFileName);
}
catch (Exception ex)
{
result.Add("result", "Exception");
result.Add("msg", ex.Message);
}
return(result);
}