How can I implement a method to get any kind of class I want?
All I want is a method( or a class ) : getClassInstance().
i.e.
Vector v = someObj.getClassInstance("java.util.Vector");
or
Collection c = someObj.getClassInstance("java.util.Collection");
thanks!
Are you talking about this?://example - let's
use Vector
//NOTE - try...catch needed for these.
//Omitted here for clarity
Class myNewClass = Class.forName("java.util.vector");
Object myNewObject = myNewClass.newInstance();
Vector myNewVector = (Vector)myNewObject;
First, thank you very much for your answer!
But what I want is a method that can return any kind of class by input a class name.
Example :(maybe like this)
Vector v = getClassInstance("java.util.Vector");
Object getClassInstance(String ClassName) {
// code
return (ClassName)someObj;
If you have any idea about this question, please tell me the detail. Thanks again!
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This is the method:
public static Bitmap[] get_images_with_clouds(Bitmap radar_image)
int e = 0;
int f = 0;
int image_clock_area_x = 0;
int image_clock_area_y = 0;
int image_clock_area_x1 = 140;
int image_clock_area_y1 = 21;
Bitmap[] localImages;
localImages = new Bitmap[15];
Bitmap image;
image = new Bitmap(Properties.Resources.radar_without_clouds);
BitmapData bmD = null;
BitmapData bmD2 = null;
try
bmD = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
bmD2 = radar_image.LockBits(new Rectangle(0, 0, radar_image.Width, radar_image.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
IntPtr sc0 = bmD.Scan0;
unsafe
int* p = (int*)sc0.ToPointer();
int* p2 = (int*)bmD2.Scan0.ToPointer();
for (e = image_clock_area_x; e < image_clock_area_x + image_clock_area_x1; e++)
for (f = image_clock_area_y; f < image_clock_area_y + image_clock_area_y1; f++)
Color clock_color = Color.FromArgb(p2[e + f * bmD2.Width]);
p[e + f * bmD.Width] = clock_color.ToArgb();
image.UnlockBits(bmD);
radar_image.UnlockBits(bmD2);
catch
try
image.UnlockBits(bmD);
catch
try
radar_image.UnlockBits(bmD2);
catch
int c;
for (c = 0; c < localImages.Length; c++)
localImages[c] = new Bitmap(image);
Bitmap new_image = new Bitmap(Properties.Resources.radar_without_clouds);
Bitmap new_image1 = new Bitmap(Properties.Resources.radar_without_clouds);
Bitmap localbmptest = black_and_white(new_image, radar_image);
Image image1 = black_and_white(new_image, radar_image);
image1.Save(@"c:\temp\testclouds666.jpg");
Bitmap clouds = new Bitmap(image1);
int x;
int y;
int a;
int b;
int d = 0;
Bitmap redImage;
redImage = new Bitmap(512, 512);
using (Graphics g = Graphics.FromImage(redImage))
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
g.Clear(Color.Red);
BitmapData bmData = null;
BitmapData bmData2 = null;
BitmapData bmDataArray = null;
try
bmData = clouds.LockBits(new Rectangle(0, 0, clouds.Width, clouds.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
bmData2 = radar_image.LockBits(new Rectangle(0, 0, radar_image.Width, radar_image.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
IntPtr scan0 = bmData.Scan0;
IntPtr scan02 = bmData2.Scan0;
unsafe
int* p = (int*)scan0.ToPointer();
int* p2 = (int*)scan02.ToPointer();
double h, mm;
for (d = 0; d < localImages.Length; d++)
bmDataArray = localImages[d].LockBits(new Rectangle(0, 0, localImages[d].Width, localImages[d].Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
IntPtr scan0Array = bmDataArray.Scan0;
int* pArray = (int*)scan0Array.ToPointer();
for (a = 0; a < new_image.Width; a++)
for (b = 0; b < new_image.Height; b++)
Color color1 = Color.FromArgb(p[a + b * bmData.Width]);
Color color2 = Color.FromArgb(p2[a + b * bmData2.Width]);
if (color1.R != 0 || color1.G != 0 || color1.B != 0)
h = color2.GetHue();
mm = RadarAnalysis.Hue2MMPerHour(h);
if (mm >= treshhold_array[14 - d])
pArray[a + b * bmDataArray.Width] = color2.ToArgb();
localImages[d].UnlockBits(bmDataArray);
clouds.UnlockBits(bmData);
radar_image.UnlockBits(bmData2);
catch (Exception error)
try
clouds.UnlockBits(bmData);
catch
try
radar_image.UnlockBits(bmData2);
catch
try
localImages[d].UnlockBits(bmDataArray);
catch
Logger.Write("Error Exception ==> " + error);
MessageBox.Show("Error Exception ==> " + error);
return localImages;
In the end i'm getting 15 Bitmaps in localImages.
localImages is Bitmap[]
The method get a Bitmap and the Bitmap pixel format is: Format8bppIndexed
I want that in the end the 15 Bitmaps in localImages will be also pixel format of Format8bppIndexed.
The problem is that if i change everywhere in the method from: PixelFormat.Format32bppArgb to PixelFormat.Format8bppIndexed
I'm getting exception on the line:
pArray[a + b * bmDataArray.Width] = color2.ToArgb();
Attempted to read or write protected memory. This is often an indication that other memory is corrupt
System.AccessViolationException was unhandled
HResult=-2147467261
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=My Weather Station
StackTrace:
at mws.ImagesComparison.get_images_with_clouds(Bitmap radar_image) in d:\C-Sharp\Download File\Downloading-File-Project-Version-012\Downloading File\ImagesComparison.cs:line 469
at mws.ScanningClouds.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in d:\C-Sharp\Download File\Downloading-File-Project-Version-012\Downloading File\ScanningClouds.cs:line 695
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)
at System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.ThreadPoolCallBack(Object o)
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
InnerException:
Line 469 is: pArray[a + b * bmDataArray.Width] = color2.ToArgb();Thorsten Hi,
Too complicated for me i will try to look on it.
Also if you will have time later maybe you could look at it too ?
For now what i tried was to get the returned 15 new Bitmaps to a local array:
bitmaps = ImagesComparison.get_images_with_clouds(b1);
for (int i = 0; i < bitmaps.Length; i++)
ConvertTo1or8Bit.ColorToGrayscale(bitmaps[i]);
break;
Then make a convertion with a new class trying to convert the Bitmaps to 8 bit in the memory without saving them first to the hard disk. This is the new class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
namespace mws
class ConvertTo1or8Bit
public ConvertTo1or8Bit()
public static Bitmap ColorToGrayscale(Bitmap bmp)
int w = bmp.Width,
h = bmp.Height,
r, ic, oc, bmpStride, outputStride, bytesPerPixel;
PixelFormat pfIn = bmp.PixelFormat;
ColorPalette palette;
Bitmap output;
BitmapData bmpData, outputData;
//Create the new bitmap
output = new Bitmap(w, h, PixelFormat.Format8bppIndexed);
//Build a grayscale color Palette
palette = output.Palette;
for (int i = 0; i < 256; i++)
Color tmp = Color.FromArgb(255, i, i, i);
palette.Entries[i] = Color.FromArgb(255, i, i, i);
output.Palette = palette;
//No need to convert formats if already in 8 bit
if (pfIn == PixelFormat.Format8bppIndexed)
output = (Bitmap)bmp.Clone();
//Make sure the palette is a grayscale palette and not some other
//8-bit indexed palette
output.Palette = palette;
return output;
//Get the number of bytes per pixel
switch (pfIn)
case PixelFormat.Format24bppRgb: bytesPerPixel = 3; break;
case PixelFormat.Format32bppArgb: bytesPerPixel = 4; break;
case PixelFormat.Format32bppRgb: bytesPerPixel = 4; break;
default: throw new InvalidOperationException("Image format not supported");
//Lock the images
bmpData = bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly,
pfIn);
outputData = output.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.WriteOnly,
PixelFormat.Format8bppIndexed);
bmpStride = bmpData.Stride;
outputStride = outputData.Stride;
//Traverse each pixel of the image
unsafe
byte* bmpPtr = (byte*)bmpData.Scan0.ToPointer(),
outputPtr = (byte*)outputData.Scan0.ToPointer();
if (bytesPerPixel == 3)
//Convert the pixel to it's luminance using the formula:
// L = .299*R + .587*G + .114*B
//Note that ic is the input column and oc is the output column
for (r = 0; r < h; r++)
for (ic = oc = 0; oc < w; ic += 3, ++oc)
outputPtr[r * outputStride + oc] = (byte)(int)
(0.299f * bmpPtr[r * bmpStride + ic] +
0.587f * bmpPtr[r * bmpStride + ic + 1] +
0.114f * bmpPtr[r * bmpStride + ic + 2]);
else //bytesPerPixel == 4
//Convert the pixel to it's luminance using the formula:
// L = alpha * (.299*R + .587*G + .114*B)
//Note that ic is the input column and oc is the output column
for (r = 0; r < h; r++)
for (ic = oc = 0; oc < w; ic += 4, ++oc)
outputPtr[r * outputStride + oc] = (byte)(int)
((bmpPtr[r * bmpStride + ic] / 255.0f) *
(0.299f * bmpPtr[r * bmpStride + ic + 1] +
0.587f * bmpPtr[r * bmpStride + ic + 2] +
0.114f * bmpPtr[r * bmpStride + ic + 3]));
//Unlock the images
bmp.UnlockBits(bmpData);
output.UnlockBits(outputData);
return output;
But they are still 32 bit. So i guess i didn't realy understand yet how to do it. -
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