我有一个aspx页面,它可以从客户端pc上传图像到服务器硬盘
但现在我需要改变我的程序,使其允许我在上传时调整图像大小。
有谁有任何想法吗?我在Input文件服务器控件中找不到这样的属性/方法。
有人能指导我吗?
我有一个aspx页面,它可以从客户端pc上传图像到服务器硬盘
但现在我需要改变我的程序,使其允许我在上传时调整图像大小。
有谁有任何想法吗?我在Input文件服务器控件中找不到这样的属性/方法。
有人能指导我吗?
一旦文件保存到服务器上,您可以使用以下代码进行调整大小。该代码将在调整大小时处理长度/宽度比。
public static Bitmap CreateThumbnail(string lcFilename, int lnWidth, int lnHeight)
{
System.Drawing.Bitmap bmpOut = null;
try
{
Bitmap loBMP = new Bitmap(lcFilename);
ImageFormat loFormat = loBMP.RawFormat;
decimal lnRatio;
int lnNewWidth = 0;
int lnNewHeight = 0;
if (loBMP.Width < lnWidth && loBMP.Height < lnHeight)
return loBMP;
if (loBMP.Width > loBMP.Height)
{
lnRatio = (decimal)lnWidth / loBMP.Width;
lnNewWidth = lnWidth;
decimal lnTemp = loBMP.Height * lnRatio;
lnNewHeight = (int)lnTemp;
}
else
{
lnRatio = (decimal)lnHeight / loBMP.Height;
lnNewHeight = lnHeight;
decimal lnTemp = loBMP.Width * lnRatio;
lnNewWidth = (int)lnTemp;
}
bmpOut = new Bitmap(lnNewWidth, lnNewHeight);
Graphics g = Graphics.FromImage(bmpOut);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnNewHeight);
g.DrawImage(loBMP, 0, 0, lnNewWidth, lnNewHeight);
loBMP.Dispose();
}
catch
{
return null;
}
return bmpOut;
}
由于在执行任何图像转换之前,您需要拥有完整的图像,因此您将无法“即时”调整大小。但是,在上传完成并在向用户显示任何结果之前,您可以使用我现在在我的几个应用程序中使用的基本图像调整大小方法:
''' <summary>
''' Resize image with GDI+ so that image is nice and clear with required size.
''' </summary>
''' <param name="SourceImage">Image to resize</param>
''' <param name="NewHeight">New height to resize to.</param>
''' <param name="NewWidth">New width to resize to.</param>
''' <returns>Image object resized to new dimensions.</returns>
''' <remarks></remarks>
Public Shared Function ImageResize(ByVal SourceImage As Image, ByVal NewHeight As Int32, ByVal NewWidth As Int32) As Image
Dim bitmap As System.Drawing.Bitmap = New System.Drawing.Bitmap(NewWidth, NewHeight, SourceImage.PixelFormat)
If bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format1bppIndexed Or _
bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format4bppIndexed Or _
bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format8bppIndexed Or _
bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Undefined Or _
bitmap.PixelFormat = Drawing.Imaging.PixelFormat.DontCare Or _
bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format16bppArgb1555 Or _
bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format16bppGrayScale Then
Throw New NotSupportedException("Pixel format of the image is not supported.")
End If
Dim graphicsImage As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(bitmap)
graphicsImage.SmoothingMode = Drawing.Drawing2D.SmoothingMode.HighQuality
graphicsImage.InterpolationMode = Drawing.Drawing2D.InterpolationMode.HighQualityBicubic
graphicsImage.DrawImage(SourceImage, 0, 0, bitmap.Width, bitmap.Height)
graphicsImage.Dispose()
Return bitmap
End Function
<asp:FileUpload ID="ProductImage" runat="server"/>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Upload" />
<asp:TextBox runat="server" ID="txtProductName" CssClass="form-control" />
<asp:RequiredFieldValidator runat="server" ControlToValidate="txtProductName" ErrorMessage="The Product name field is required." />
同时上传及裁剪图片 (upload.aspx.cs)
缩放
/// <summary>
/// Created By Rajib Chowdhury Mob. 01766-306306; Web: http://onlineshoping.somee.com/
/// Complete This Page Coding On January 05, 2014
/// Programing C# By Visual Studio 2013 For Web
/// Dot Net Version 4.5
/// Database Virsion MSSQL Server 2005
/// </summary>
public bool ResizeImageAndUpload(System.IO.FileStream newFile, string folderPathAndFilenameNoExtension, double maxHeight, double maxWidth)
{
try
{
// Declare variable for the conversion
float ratio;
// Create variable to hold the image
System.Drawing.Image thisImage = System.Drawing.Image.FromStream(newFile);
// Get height and width of current image
int width = (int)thisImage.Width;
int height = (int)thisImage.Height;
// Ratio and conversion for new size
if (width > maxWidth)
{
ratio = (float)width / (float)maxWidth;
width = (int)(width / ratio);
height = (int)(height / ratio);
}
// Ratio and conversion for new size
if (height > maxHeight)
{
ratio = (float)height / (float)maxHeight;
height = (int)(height / ratio);
width = (int)(width / ratio);
}
// Create "blank" image for drawing new image
Bitmap outImage = new Bitmap(width, height);
Graphics outGraphics = Graphics.FromImage(outImage);
SolidBrush sb = new SolidBrush(System.Drawing.Color.White);
// Fill "blank" with new sized image
outGraphics.FillRectangle(sb, 0, 0, outImage.Width, outImage.Height);
outGraphics.DrawImage(thisImage, 0, 0, outImage.Width, outImage.Height);
sb.Dispose();
outGraphics.Dispose();
thisImage.Dispose();
// Save new image as jpg
outImage.Save(Server.MapPath(folderPathAndFilenameNoExtension + ".jpg"), System.Drawing.Imaging.ImageFormat.Jpeg);
outImage.Dispose();
return true;
}
catch (Exception)
{
return false;
}
}
按钮1的点击事件
string filePath = "~\\Image\\";//your normal image path
if (Page.IsValid)
{
HttpPostedFile myFile = ProductImage.PostedFile;//Get Slected Image
int nFileLen = myFile.ContentLength;//Get slected Image Size
string myimag = txtProductName.Text;//Get user input image name
Guid ImageName = Guid.NewGuid();//get unique id
if ((myFile != null) && (nFileLen > 1048576))
{
LabelAddStatus.Text = "minimum size exceed"; //If file image size 1 MB above
}
else
{
try
{
if (ProductImage.HasFile)
{
String fileExtension = System.IO.Path.GetExtension(ProductImage.FileName).ToLower();
String[] allowedExtensions = { ".jpg" };//Declare For Allowed Extension
for (int i = 0; i < allowedExtensions.Length; i++)
{
if (fileExtension == allowedExtensions[i])
{
// Read file into a data stream
byte[] myData = new Byte[nFileLen];
myFile.InputStream.Read(myData, 0, nFileLen);
myFile.InputStream.Dispose();
// Save the stream to disk as temporary file. make sure the path is unique!
System.IO.FileStream newFile
= new System.IO.FileStream(Server.MapPath(filePath + "_temp.jpg"),
System.IO.FileMode.Create);
newFile.Write(myData, 0, myData.Length);
bool success = ResizeImageAndUpload(newFile, filePath + ("thumbs"+myimag + ImageName), 100, 100);//Save image your thumb image path
success = ResizeImageAndUpload(newFile, filePath + (myimag + ImageName), 768, 1024);//Save image your normal image path
//delete the temp file.
newFile.Close();
System.IO.File.Delete(Server.MapPath(filePath + "_temp.jpg"));
LabelAddStatus.Text = "File uploaded.";
}
else
{
LabelAddStatus.Text = "Unable to accept file type..";
}
}
}
}
catch (Exception)
{
//No Exception Message
}
}
}
感谢您的...
另一种方法是允许用户在浏览器中调整大小,然后根据其他答案所述调整图像大小。
因此,请查看此解决方案,它允许您使用jQuery、jCrop和ASP.NET上传和裁剪图像。
public static System.Drawing.Image ScaleImage(System.Drawing.Image image, int maxHeight)
{
var ratio = (double)maxHeight / image.Height;
var newWidth = (int)(image.Width * ratio);
var newHeight = (int)(image.Height * ratio);
var newImage = new Bitmap(newWidth, newHeight);
using (var g = Graphics.FromImage(newImage))
{
g.DrawImage(image, 0, 0, newWidth, newHeight);
}
return newImage;
}
点击按钮时:
protected void Button1_Click(object sender, EventArgs e)
{
lblmsg.Text="";
if ((File1.PostedFile != null) && (File1.PostedFile.ContentLength > 0))
{
Guid uid = Guid.NewGuid();
string fn = System.IO.Path.GetFileName(File1.PostedFile.FileName);
string SaveLocation = Server.MapPath("LogoImagesFolder") + "\\" + uid+fn;
try
{
string fileExtention = File1.PostedFile.ContentType;
int fileLenght = File1.PostedFile.ContentLength;
if (fileExtention == "image/png" || fileExtention == "image/jpeg" || fileExtention == "image/x-png")
{
if (fileLenght <= 1048576)
{
System.Drawing.Bitmap bmpPostedImage = new System.Drawing.Bitmap(File1.PostedFile.InputStream);
System.Drawing.Image objImage = ScaleImage(bmpPostedImage, 81);
objImage.Save(SaveLocation,ImageFormat.Png);
lblmsg.Text = "The file has been uploaded.";
lblmsg.Style.Add("Color", "Green");
}
else
{
lblmsg.Text = "Image size cannot be more then 1 MB.";
lblmsg.Style.Add("Color", "Red");
}
}
else {
lblmsg.Text = "Invaild Format!";
lblmsg.Style.Add("Color", "Red");
}
}
catch (Exception ex)
{
lblmsg.Text= "Error: " + ex.Message;
lblmsg.Style.Add("Color", "Red");
}
}
}
你可以使用这个,它对我来说做得很好。但是对于低分辨率的图像,它处理得不太好。幸运的是,我没有使用太多这样的图像。只需将图像byte[]
和期望的输出发送给它,你就可以开始了。
public static byte[] ResizeImageFile(byte[] imageFile, int targetSize)
{
using (System.Drawing.Image oldImage = System.Drawing.Image.FromStream(new MemoryStream(imageFile)))
{
Size newSize = CalculateDimensions(oldImage.Size, targetSize);
using (Bitmap newImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format32bppRgb))
{
newImage.SetResolution(oldImage.HorizontalResolution, oldImage.VerticalResolution);
using (Graphics canvas = Graphics.FromImage(newImage))
{
canvas.SmoothingMode = SmoothingMode.AntiAlias;
canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;
canvas.DrawImage(oldImage, new Rectangle(new Point(0, 0), newSize));
MemoryStream m = new MemoryStream();
newImage.Save(m, ImageFormat.Jpeg);
return m.GetBuffer();
}
}
}
}
private static Size CalculateDimensions(Size oldSize, int targetSize)
{
Size newSize = new Size();
if (oldSize.Width > oldSize.Height)
{
newSize.Width = targetSize;
newSize.Height = (int)(oldSize.Height * (float)targetSize / (float)oldSize.Width);
}
else
{
newSize.Width = (int)(oldSize.Width * (float)targetSize / (float)oldSize.Height);
newSize.Height = targetSize;
}
return newSize;
}
//Here is another WAY fox!!! i have actually modify the code from You all. HIHI
//First, add one textBox and one FileUpload Control, and a button
//paste this in your code behind file... after public partial class admin : System.Web.UI.Page
string OriPath;
string ImageName;
public Size NewImageSize(int OriginalHeight, int OriginalWidth, double FormatSize)
{
Size NewSize;
double tempval;
if (OriginalHeight > FormatSize && OriginalWidth > FormatSize)
{
if (OriginalHeight > OriginalWidth)
tempval = FormatSize / Convert.ToDouble(OriginalHeight);
else
tempval = FormatSize / Convert.ToDouble(OriginalWidth);
NewSize = new Size(Convert.ToInt32(tempval * OriginalWidth), Convert.ToInt32(tempval * OriginalHeight));
}
else
NewSize = new Size(OriginalWidth, OriginalHeight); return NewSize;
}
//Now, On Button click add the folwing code.
if (FileUpload1.PostedFile != null)
{
ImageName = TextBox1.Text+".jpg";
OriPath = Server.MapPath("pix\\") + ImageName;
//Gets the Full Path using Filecontrol1 which points to actual location in the hardisk :)
using (System.Drawing.Image Img = System.Drawing.Image.FromFile(System.IO.Path.GetFullPath(FileUpload1.PostedFile.FileName)))
{
Size ThumbNailSize = NewImageSize(Img.Height, Img.Width, 800);
using (System.Drawing.Image ImgThnail = new Bitmap(Img, ThumbNailSize.Width, ThumbNailSize.Height))
{
ImgThnail.Save(OriPath, Img.RawFormat);
ImgThnail.Dispose();
}
Img.Dispose();
}
}
//Enjoy. If any problem,, mail me at izacmail@gmail.com
要调整图像大小并获得较小的尺寸,只需进行以下更改
bmpOut = new Bitmap(lnNewWidth, lnNewHeight, **System.Drawing.Imaging.PixelFormat.Format24bppRgb**);
Graphics g = Graphics.FromImage(bmpOut);
当你设置图像的PixelFormat时,将其设置为Format24bppRgb。
当你保存文件时,也要设置ImageFormat。就像这样:
bmpOut.Save(PathImage, System.Drawing.Imaging.ImageFormat.Jpeg);
public string ResizeImageAndSave(int Width, int Height, string imageUrl, string destPath)
{
System.Drawing.Image fullSizeImg = System.Drawing.Image.FromFile(imageUrl);
double widthRatio = (double)fullSizeImg.Width / (double)Width;
double heightRatio = (double)fullSizeImg.Height / (double)Height;
double ratio = Math.Max(widthRatio, heightRatio);
int newWidth = (int)(fullSizeImg.Width / ratio);
int newHeight = (int)(fullSizeImg.Height / ratio);
//System.Drawing.Image.GetThumbnailImageAbort dummyCallBack = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
System.Drawing.Image thumbNailImg = fullSizeImg.GetThumbnailImage(newWidth, newHeight, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
//DateTime MyDate = DateTime.Now;
//String MyString = MyDate.ToString("ddMMyyhhmmss") + imageUrl.Substring(imageUrl.LastIndexOf("."));
thumbNailImg.Save(destPath, ImageFormat.Jpeg);
thumbNailImg.Dispose();
return "";
}
public bool ThumbnailCallback() { return false; }