c#图像处理 未处理securityexception

[roar1987]

做了一个关于图像放缩的程序
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width*curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr,grayValues,0,bytes);

//得到横向和纵向的缩放量
double x = 5;
double y = 5;

//图像的几何中心
int halfWidth = (int) (curBitmap.Width/2);
int halfHeight = (int) (curBitmap.Height/2);

int xz = 0;
int yz = 0;
int tempWidth = 0;
int tempHeight = 0;
byte[] tempArray = new byte[bytes];

//最临近插值法
for(int i = 0;i < curBitmap.Width;i++)
{
for(int j = 0;j < curBitmap.Height;j++)
{
//以图像的几何中心为坐标原点进行坐标转换
//按逆向映射法得到输入图像的坐标
tempHeight = i - halfHeight;
tempWidth = j - halfWidth;

//在不同的象限进行四舍五入处理
if(tempWidth > 0)
{
xz = (int) (tempWidth/x + 0.5);
}
else
{
xz = (int) (tempWidth/x - 0.5);
}
if(tempHeight > 0)
{
yz = (int) (tempHeight/y + 0.5);
}
else
{
yz = (int) (tempHeight/y - 0.5);
}

//坐标逆变换
tempWidth = xz + halfWidth;
tempHeight = yz + halfHeight;
//得到输出图像像素值
if(tempWidth < 0 || tempWidth >= curBitmap.Width || tempHeight < 0 || tempHeight >= curBitmap.Height)
{
//缩放后留下的空白部分用白色像素代替
tempArray[i*curBitmap.Width + j] = 255;
}
else
{
tempArray[i*curBitmap.Width + j] = grayValues[tempHeight*curBitmap.Width + tempWidth];
}
}
}

调试的时候报出了这个错误：
请求“System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089”类型的权限已失败。
应该是红色部分除了问题
之前没有做过图像操作部分的代码，请高手相助！

[xingyuebuyu]

int bytes = bmpData.Stride*curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr,grayValues,0,bytes);

这样改,你那样算的数据空间是不对的,看下别人的解释

http://blog.csdn.net/ki1381/archive/2007/01/10/1478611.aspx

[roar1987]

谢谢您的回复 为什么我那样写报出的异常是在主函数里面呢 就在该窗口运行的地方？我想知道这是什么错误
如果单纯的是数据空间计算错误 是不是不该这样 还请解答 多谢

[xingyuebuyu]

贴完整代码看看

你单步调试是到哪一步出错的?

[roar1987]

static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
这个数主函数，异常出在上面红色的地方
上面的代码是一个Button 的响应函数 Button的作用是缩放
在屏幕上放了一个picture作为绘图的容器 在窗口的load里面 绘制了一些格子
代码如下
private Bitmap curBitmap = new Bitmap(600,800);
private void Form1_Load(object sender, EventArgs e)
{
Image image = curBitmap;
Graphics graphics = Graphics.FromImage(image);
pictureBox1.Image = image;

float size = Convert.ToSingle(0.5);
Pen pen = new Pen(Color.Black, size);

int row = 600;
int col = 800;

for (int i = 0; i < row; i++)
{
graphics.DrawLine(pen, 0, 0 + 5 * i, 600, 0 + 5 * i);
}
for (int j = 0; j < col; j++)
{
graphics.DrawLine(pen, 0 + 5 * j, 0, 0 + 5 * j, 800);
}
}
private void button2_Click(object sender, EventArgs e)
{}该函数内部是本贴的那部分代码

[xingyuebuyu]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            //work();
        }

        void work()
        {
            while (true)
            {
                backgroundWorker1.RunWorkerAsync();
                //backgroundWorker1.ReportProgress
            }

        }

        void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {

        }

        private Bitmap curBitmap = new Bitmap(600, 800);

        private void Form1_Load(object sender, EventArgs e)
        {
Image image = curBitmap;
Graphics graphics = Graphics.FromImage(image);
pictureBox1.Image = image;

float size = Convert.ToSingle(0.5);
Pen pen = new Pen(Color.Black, size);

int row = 600;
int col = 800;

for (int i = 0; i < row; i++)
{
graphics.DrawLine(pen, 0, 0 + 5 * i, 600, 0 + 5 * i);
}
for (int j = 0; j < col; j++)
{
graphics.DrawLine(pen, 0 + 5 * j, 0, 0 + 5 * j, 800);
}


        }

        private void button1_Click(object sender, EventArgs e)
        {
            Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
            BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
            curBitmap.PixelFormat);
            IntPtr ptr = bmpData.Scan0;
            int bytes =bmpData.Stride * curBitmap.Height;
            byte[] grayValues = new byte[bytes];
            System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);

            //得到横向和纵向的缩放量
            double x = 5;
            double y = 5;

            //图像的几何中心
            int halfWidth = (int)(curBitmap.Width / 2);
            int halfHeight = (int)(curBitmap.Height / 2);

            int xz = 0;
            int yz = 0;
            int tempWidth = 0;
            int tempHeight = 0;
            byte[] tempArray = new byte[bytes];

            //最临近插值法
            for (int i = 0; i < curBitmap.Width; i++)
            {
                for (int j = 0; j < curBitmap.Height; j++)
                {
                    //以图像的几何中心为坐标原点进行坐标转换
                    //按逆向映射法得到输入图像的坐标
                    tempHeight = i - halfHeight;
                    tempWidth = j - halfWidth;

                    //在不同的象限进行四舍五入处理
                    if (tempWidth > 0)
                    {
                        xz = (int)(tempWidth / x + 0.5);
                    }
                    else
                    {
                        xz = (int)(tempWidth / x - 0.5);
                    }
                    if (tempHeight > 0)
                    {
                        yz = (int)(tempHeight / y + 0.5);
                    }
                    else
                    {
                        yz = (int)(tempHeight / y - 0.5);
                    }

                    //坐标逆变换
                    tempWidth = xz + halfWidth;
                    tempHeight = yz + halfHeight;
                    //得到输出图像像素值
                    if (tempWidth < 0 || tempWidth >= curBitmap.Width || tempHeight < 0 || tempHeight >= curBitmap.Height)
                    {
                        //缩放后留下的空白部分用白色像素代替
                        tempArray[i * curBitmap.Width + j] = 255;
                    }
                    else
                    {
                        tempArray[i * curBitmap.Width + j] = grayValues[tempHeight * curBitmap.Width + tempWidth];
                    }
                }
            }

            curBitmap.UnlockBits(bmpData);

        }
    }
}

我这里是没问题的,你是不是因为button点击第二次的时候出的问题?

因为你没调用curBitmap.UnlockBits(bmpData);
所有的数据还是lock状态,你要unlock才可以的

[roar1987]

前些日子有一个考试在准备，没能够及时回帖，感谢您的回复