Bitmap to BitmapImage Conversion Not Working - WPF - C# Discussion Boards

Tej_dev30-Mar-16 8:14

Tej_dev

30-Mar-16 8:14

tried below code still DB2 CLP window remains open

using (objProcess = new Process())
{
try
{
//Connect To IBM DB2 database using CLP Process Object
//<tbd> Need to work on autoclose DB2 CLP
objProcStartInfo = new ProcessStartInfo("db2cmd.exe", "db2 connect to " + strMasterdatabaseName + " user " + strserviceAccountUserName + " using " + strserviceAccountPassword + "&db2 -f " + strexportFilePath + " > " + strexportLogFilePath + "");
objProcStartInfo.RedirectStandardOutput = false;
objProcStartInfo.UseShellExecute = false;
objProcStartInfo.CreateNoWindow = false;

objProcess.StartInfo = objProcStartInfo;
objProcess.Start();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
objProcStartInfo = null;
objProcess.Dispose();
}
}
}

Richard Deeming30-Mar-16 8:44

Richard Deeming

30-Mar-16 8:44

Calling Dispose on a Process only cleans up the unmanaged resources; it doesn't terminate the process.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Message Closed

30-Mar-16 8:52

Gerry Schmitz

30-Mar-16 8:52

Message Closed

modified 30-Mar-16 15:05pm.

Richard Deeming30-Mar-16 8:54

Richard Deeming

30-Mar-16 8:54

The window the the OP is seeing belongs to the external db2cmd.exe process. Your answer implied that disposing of the Process instance would close that window.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Richard Deeming30-Mar-16 8:52

Richard Deeming

30-Mar-16 8:52

Try adding -c at the start of the arguments:

objProcStartInfo = new ProcessStartInfo("db2cmd.exe", string.Format("-c db2 connect to {0} user {1} using {2}&db2 -f {3} > {4}", strMasterdatabaseName, strserviceAccountUserName, strserviceAccountPassword, strexportFilePath, strexportLogFilePath));

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Bitmap to BitmapImage Conversion Not Working - WPF

Tej_dev30-Mar-16 9:03

Tej_dev

30-Mar-16 9:03

excellent , I added -c and its working fine. thanks Richard Smile | :)

objProcStartInfo = new ProcessStartInfo("db2cmd.exe", "-c db2 connect to " + strMasterdatabaseName + " user " + strserviceAccountUserName + " using " + strserviceAccountPassword + "&db2 -f " + strexportFilePath + " > " + strexportLogFilePath + "");

AmbiguousName30-Mar-16 4:36

AmbiguousName

30-Mar-16 4:36

Hello. I am using following code to convert bitmap to BitmapImage, in order to show on System.Windows.Control.Image control.

  public BitmapImage ConvertBitmapToBitmapImage(System.Drawing.Bitmap bitmap)
  {
      BitmapImage bitmapImage = null;
      using (var memory = new System.IO.MemoryStream())
      {
          bitmap.Save(memory, System.Drawing.Imaging.ImageFormat.Bmp);
          memory.Position = 0;

          bitmapImage = new BitmapImage();
          bitmapImage.BeginInit();
          bitmapImage.StreamSource = memory;
          bitmapImage.EndInit();

          return bitmapImage;
      }
  }

public void ShowPicture(Bitmap bmp)
{
     pictureBox.Source = ConvertBitmapToBitmapImage(bmp);
     return;
}

It does not throw any exception but it does not show picture as well. When I try to view the picture, it opens up WPF visualizer and shows me some values (properties of BitmapImage), while the bitmap is fine.

What is wrong with my code. Thanks for any input.

This world is going to explode due to international politics, SOON.

Re: Bitmap to BitmapImage Conversion Not Working - WPF

Rob Philpott30-Mar-16 5:46

Rob Philpott

30-Mar-16 5:46

I don't know the answer to this, but Googling suggests others might:

c# - loading the source of a BitmapImage in WPF? - Stack Overflow[^]

Essentially, there's a suggestion that StreamSource is only accessed when needed by which time your memory stream will have been disposed. The suggestion is to set CacheOption or something.

I'd so some Googling!

Regards,
Rob Philpott.

Re: Bitmap to BitmapImage Conversion Not Working - WPF

AmbiguousName30-Mar-16 6:04

AmbiguousName

30-Mar-16 6:04

I did google. I know it is some small mistake that I am not seeing. But I did google alot. Thanks again.

This world is going to explode due to international politics, SOON.

Re: Bitmap to BitmapImage Conversion Not Working - WPF

Matt T Heffron30-Mar-16 6:54

Matt T Heffron

30-Mar-16 6:54

Here's the converter I wrote years ago. It converts a Bitmap to ImageSource (specifically a BitmapFrame):

using System;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace ResourcesLibrary
{
  [ValueConversion(typeof(Bitmap), typeof(ImageSource))]
  public class BitmapToImageSourceConverter : IValueConverter
  {
    [DllImport("gdi32.dll")]
    private static extern bool DeleteObject(IntPtr hObject);
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
      Bitmap bmp = value as Bitmap;
      if (bmp == null)
        return null;
      using (Stream str = new MemoryStream())
      {
        bmp.Save(str, System.Drawing.Imaging.ImageFormat.Bmp);
        str.Seek(0, SeekOrigin.Begin);
        BitmapDecoder bdc = new BmpBitmapDecoder(str, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
        return bdc.Frames[0];
      }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
      throw new NotImplementedException();
    }
  }
}

"Fairy tales do not tell children the dragons exist. Children already know that dragons exist. Fairy tales tell children the dragons can be killed."
- G.K. Chesterton

Re: Bitmap to BitmapImage Conversion Not Working - WPF

Gerry Schmitz30-Mar-16 7:06

Gerry Schmitz

30-Mar-16 7:06

Compared to my working code:

bitmapimage.BeginInit();
bitmapimage.StreamSource = memory;
bitmapimage.CacheOption = BitmapCacheOption.OnLoad;
bitmapimage.EndInit();

and

window.Content = imageControl;
window.UpdateLayout();
window.ShowDialog();

Don't know enough about your app ... you may be able to apply .UpdateLayout() somewhere else in the visual tree.

Re: Bitmap to BitmapImage Conversion Not Working - WPF

V.31-Mar-16 3:42

31-Mar-16 3:42

this should work:

/// <summary>
/// makes the image uniform between operations, size wise and concerning pixelformat.
/// </summary>
/// <param name="bmp"></param>
private BitmapImage SetModifiedImage(System.Drawing.Bitmap bmp){
    bmp = CreateNonIndexedImage(bmp);
    BitmapImage bmpi = new BitmapImage(); 
    bmpi.BeginInit(); 
    bmpi.StreamSource = new System.IO.MemoryStream((byte[])(new System.Drawing.ImageConverter()).ConvertTo(bmp, typeof(byte[])));
    bmpi.EndInit(); 
        return bmpi;
}

/// <summary>
/// Removes the index color table of the image and makes it uniform.
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
private System.Drawing.Bitmap CreateNonIndexedImage(System.Drawing.Bitmap bmp){
    System.Drawing.Bitmap newbmp = new System.Drawing.Bitmap(bmp.Width, bmp.Height, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
    System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(newbmp);
    g.DrawImage(bmp, 0, 0);
    return newbmp;          
}

You don't need the "CreateNonIndexedImage" normally. I had different sets of input and the difference in the PixelFormat gave me problems when working on the bytes of the bitmap.

Hope this helps.

(MQOTD rules and previous solutions)

working with pixels

Hira Khalid29-Mar-16 3:16

Hira Khalid

29-Mar-16 3:16

If we have three pixels, every pixel has 3 bytes (R,G,B). The value of R is (237,19,119) and the value of G is (24,178,203) and the value of B is (230,18,124). If we print these three pixels using C##, what will be the variations in gray-scale? Roll eyes | :rolleyes:

OriginalGriff29-Mar-16 3:33

OriginalGriff

29-Mar-16 3:33

Pardon?
I'm sorry, but that makes no sense at all.
If you want to see what colours are produced, then write a simple program which sets small blocks to teh appropriate colours: Graphics.DrawRectangle[^] should do it.
But just asking that with no explanation on what you are trying to achieve? Not likely to get you the solution you are looking for.

And be aware: Not all monitors render colours the same, not all printers do either (which I why I have to spend ages trying to colour match one of my monitors to my printer...) - so the variation in "grey scale" for three different colours, none of which are grey is going to be a bit moot...

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Dave Kreskowiak29-Mar-16 3:45

Dave Kreskowiak

29-Mar-16 3:45

Sorry but this sniffs of homework. We're not going to do your work for you.

A guide to posting questions on CodeProject

Click this: Asking questions is a skill.
Seriously, do it.

Dave Kreskowiak

Eddy Vluggen29-Mar-16 4:06

Eddy Vluggen

29-Mar-16 4:06

Hira Khalid wrote:
what will be the variations in gray-scale?

Which grayscale?

32 bit, or just 16 shades of gray? Smile | :)

Draw your pixels on a bitmap, convert the bitmap, inspect the pixel.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Richard MacCutchan29-Mar-16 4:25

Richard MacCutchan

29-Mar-16 4:25

Hira Khalid wrote:
The value of R is (237,19,119)

Really, in a single byte?

Accessing unmanaged class from C#

harold aptroot29-Mar-16 9:34

harold aptroot

29-Mar-16 9:34

There is only one part of this question that makes sense, which is that every pixel has R, G and B, all bytes, which is very likely since that's the most common type of pixel these days. The rest may make sense in some parallel universe but not in this one.

Leif Simon Goodwin29-Mar-16 1:22

Leif Simon Goodwin

29-Mar-16 1:22

I have a DLL which exports two methods, getSc and releasesSc. The first returns a handle which is a pointer to a class instance. I wish to call the methods on that class instance. Unfortunately that class is not exported as dumpbin proves:

1 0 00001040 ??4CSmartCard@XXXXXDLLNamespace@@QAEAAV01@ABV01@@Z
2 1 00003E40 _getSc@0
3 2 00003E70 _releaseSc@0
4 3 00003E40 getSc
5 4 00003E70 releaseSc

Is there a neat way to call the method on that class instance from C#/.Net?

The only way I can think of is to create an unmanaged DLL which wraps the other DLL. Thus the second DLL would expose functions to call into the class instance.

Richard MacCutchan29-Mar-16 1:42

Richard MacCutchan

29-Mar-16 1:42

If the class methods are not exported then how will you access them from unmanaged code?

Leif Simon Goodwin29-Mar-16 4:17

Leif Simon Goodwin

29-Mar-16 4:17

Well, that is the key question isn't it. Smile | :)

I was wondering if there is some equivalent to the manner in which you invoke methods on a COM interface i.e. you effectively tell it the prototype in the code.

Richard MacCutchan29-Mar-16 4:32

Richard MacCutchan

29-Mar-16 4:32

You still need to know the prototype in order to call the methods. So how do you access these methods once you have a handle to the class object?

Leif Simon Goodwin29-Mar-16 5:10

Leif Simon Goodwin

29-Mar-16 5:10

At present you add a DllImport with the prototype. So you might hope for something similar for an unmanaged C++ class instance. But apparently not. Ah well.

Incidentally I know that if the DLL exports the class, you can invoke the methods by passing the instance handle as the first argument to the method. But that is not the case I have.

Anyway, the wrapper is written. Smile | :)