OutOfMemory例外（裁剪图像时） [英] OutofMemory Exception (when cropping an Image)

问题描述

我试图裁剪，从一个字节数组来的图像。倒霉，我得到了我的cropImage功能OutOfMemory例外。这部分节目我怎么写上的文件。

  System.IO.MemoryStream毫秒​​=新System.IO.MemoryStream（strArr）;System.Drawing.Rectangle oRectangle =新System.Drawing.Rectangle（）;
oRectangle.X = 50;
oRectangle.Y = 100;
oRectangle.Height = 180;
oRectangle.Width = 240;为System.Drawing.Image oImage = System.Drawing.Image.FromStream（毫秒）;
cropImage（oImage，oRectangle）;
名称= DateTime.Now.Ticks.ToString（）+.JPG;
System.IO.File.WriteAllBytes（context.Server.MapPath（名称），strArr）;
context.Response.Write（http://local.x.com/test/+名称）;
 

和这部分是我的裁剪图像功能，很明显它是做什么..

 私有静态System.Drawing.Image对象cropImage（System.Drawing.Image对象IMG，System.Drawing.Rectangle cropArea）
{
    System.Drawing.Bitmap bmpImage =新System.Drawing.Bitmap（IMG）;
    System.Drawing.Bitmap bmpCrop = bmpImage.Clone（cropArea，
    bmpImage.PixelFormat）;
    回报（System.Drawing.Image对象）（bmpCrop）;
}
 

这就是我如何构造我的strArr

 的System.IO.Stream海峡= context.Request.InputStream;
INT STRLEN = Convert.ToInt32（str.Length）;
字节[] = strArr新的字节[STRLEN]
str.Read（strArr，0，strlen的）;
串ST = String.Concat（Array.ConvertAll（strArr中，x =＆GT; x.ToString（X2）））; //尝试4
 

解决方案

我直接从字节数组裁剪它，它只是工作:)谢谢大家谁想尽办法帮助我。

 字节公众[] CropImage（INT X，INT Y，INT W，INT小时，字节[] imageBytes）
    {
        使用（MemoryStream的毫秒=新的MemoryStream（imageBytes，0，imageBytes.Length））
        {
            ms.Write（imageBytes，0，imageBytes.Length）;
            为System.Drawing.Image IMG = System.Drawing.Image.FromStream（MS，真）;
            位图bmpCropped =新位图（W，H）;
            图形G = Graphics.FromImage（bmpCropped）;            矩形rectDestination =新的Rectangle（0，0，bmpCropped.Width，bmpCropped.Height）;
            矩形rectCropArea =新的Rectangle（X，Y，W，H）;            g.DrawImage（IMG，rectDestination，rectCropArea，GraphicsUnit.Pixel）;
            g.Dispose（）;            MemoryStream的流=新的MemoryStream（）;
            bmpCropped.Save（流System.Drawing.Imaging.ImageFormat.Jpeg）;
            返回stream.ToArray（）;
        }
    }
 

I am trying to crop an Image that coming from a byte array. Unlucky, I get the OutofMemory Exception in my cropImage function. this part show how I write it on a file.

System.IO.MemoryStream ms = new System.IO.MemoryStream(strArr);

System.Drawing.Rectangle oRectangle = new System.Drawing.Rectangle();
oRectangle.X = 50;
oRectangle.Y = 100;
oRectangle.Height = 180;
oRectangle.Width = 240;

System.Drawing.Image oImage = System.Drawing.Image.FromStream(ms);
cropImage(oImage, oRectangle);
name = DateTime.Now.Ticks.ToString() + ".jpg";
System.IO.File.WriteAllBytes(context.Server.MapPath(name), strArr);
context.Response.Write("http://local.x.com/test/" + name);

and this part is my crop Image function which is obvious what it is doing..

private static System.Drawing.Image cropImage(System.Drawing.Image img, System.Drawing.Rectangle cropArea)
{
    System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(img);
    System.Drawing.Bitmap bmpCrop = bmpImage.Clone(cropArea,
    bmpImage.PixelFormat);
    return (System.Drawing.Image)(bmpCrop);
}

and this is how I construct my strArr

System.IO.Stream str = context.Request.InputStream;
int strLen = Convert.ToInt32(str.Length);
byte[] strArr = new byte[strLen];
str.Read(strArr, 0, strLen);
string st = String.Concat(Array.ConvertAll(strArr, x => x.ToString("X2"))); // try 4

解决方案

I cropped it from byte array directly and it just works :) thanks everyone who tried their best to help me.

public byte[] CropImage(int x, int y, int w, int h, byte[] imageBytes)
    {
        using (MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
        {
            ms.Write(imageBytes, 0, imageBytes.Length);
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms, true);
            Bitmap bmpCropped = new Bitmap(w, h);
            Graphics g = Graphics.FromImage(bmpCropped);

            Rectangle rectDestination = new Rectangle(0, 0, bmpCropped.Width, bmpCropped.Height);
            Rectangle rectCropArea = new Rectangle(x, y, w, h);

            g.DrawImage(img, rectDestination, rectCropArea, GraphicsUnit.Pixel);
            g.Dispose();

            MemoryStream stream = new MemoryStream();
            bmpCropped.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
            return stream.ToArray();
        }
    }

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