C# Discussion Boards - CodeProject

3-Mar-07 7:25

How do i get the byte[] associated to the System.Drawing.Bitmap class???

a fast and helpful answer is requier Smile | :)

KainPlan.

Wayne Phipps3-Mar-07 8:03

Wayne Phipps

3-Mar-07 8:03

You could do something like this....

http://www.codeproject.com/script/comments/forums.asp?msg=1899495&forumid=1649&mode=all&userid=129342#xx1899495xx

Hope it helps

Regards

Wayne Phipps
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KainPlan3-Mar-07 8:26

3-Mar-07 8:26

Yeah i know this... it works... but the display works with 8 bit per pixel and the result of viewing the bitmap is not what it meant for. (sry for bad english) I need to Convert the Bitmap or the array but it all happens in a rendering thread at 10fps and a convert like this:

for (int y = 0; y < bmp.Height; y++)
{
for (int x = 0; x < bmp.Width; x++)
{

byte b = 0;
if (bmp.GetPixel(x, y).B < 128)
b = 128;
arr_bytes[i] = b;
i++;
}
}

is too slow.

Edit:
(if b >= 128 the display draws a black pixel.)

.armin3-Mar-07 11:16

.armin

3-Mar-07 11:16

Use System.Drawing.Bitmap.LockDIBits() and System.Runtime.InteropServices.Marshal.Copy

KainPlan3-Mar-07 14:33

3-Mar-07 14:33

yeah this works too!!! but its the problem of the 8bits again...

the Display works with 160x43x1 how to convert the 160x43x4 that its shown correct on the display...
Its in a rendering Thread, means no slow actions like for or while loops. i need something like to get only every 4th bit of the array i think... 32bpp to 8bpp...
Or maybe first convert the System.Drawing.Bitmap from 32bpp to 8bpp and then Marshall.Copy the bytes..

Any ideas??? Sry for bad english

KainPlan3-Mar-07 19:37

How to force an IE window to be opened on link click from axWebBrowser

3-Mar-07 19:37

AHHHHH!!!!!! I GOT IT Smile | :)

//Preform bit reading of bmp.
Draw.Rectangle rect = new Draw.Rectangle(0, 0, bmp.Width, bmp.Height);
System.Drawing.Imaging.BitmapData bmpData =
bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
bmp.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = bmp.Width * bmp.Height * 4;
byte[] rgbValues = new byte[bytes];
//Marshal copy the bits at ptr to rgbValues at 0 for a size of bytes.
System.Runtime.
InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);
bytes = bmp.Width * bmp.Height * 1;
byte[] bValues = new byte[bytes];
int i = 0;
//Convert into a Displayable kind.
while (i != bytes)
{
bValues[i] = rgbValues[i * 4];
i++;
}

lgbmp.pixels = bValues;

a little bit worse but it works with no timing issues!!!

vedmack3-Mar-07 6:21

vedmack

3-Mar-07 6:21

I'm not interested in simple solution of getting the url and opening IE from process.start(IE,url)

the closest thing i had in mind is : when i right click the link from axWebBrowser and choose "open in new window" it opens it in new IE window, so I'm looking for a way to imitate it somehow and perform the same action on left mouse click on that link (and it will open a new IE window), like re-routing from axWebBrowser into IE.

again, im not interested in the url that is being opened on "open in new window" its more complicated than that, thats why I'm looking for a way to "re-route" from axWebBrowser into IE.

thx ahead!

Managed & Unmanaged objects classification...

Shy Agam3-Mar-07 5:36

Shy Agam

3-Mar-07 5:36

Hello experts,

I'm pondering on the matter for some time now...
How can I tell which object types are managed types, and which are unmanaged?
I was writing a Dispose(bool disposing) method for one of my classes, and the question poped up...

protected virtual void Dispose(bool disposing)
{
    if (!disposed)
    {
        if (disposing)
        {
            // Managed stuff disposal
        }
    }
    // Unmanaged stuff disposal

    disposed = true;
}

How do I know which objects should be disposed of in the if (disposing) {...} block?

I guess a FileStream and maybe other streams are unmanaged and should be disposed outside of the block.
What about sockets, timers, etc.?

How to tell?? D'Oh! | :doh:

Thanks in advance,
Shy.

Guffa3-Mar-07 6:00

Guffa

3-Mar-07 6:00

You should treat any class that implements IDisposable as containing unmanaged resources.

Some classes, like for example MemoryStream, does implement IDisposable eventhough it doesn't contain any unmanaged resources. You should dispose of it anyway, partly just to follow the pattern, but also because the memory management works better if you dispose of all disposable objects.

---
single minded; short sighted; long gone;

Shy Agam3-Mar-07 6:03

Shy Agam

3-Mar-07 6:03

So what should the if (disposing) { ... } block contain?
Should I simply set each non-disposable object to null?

S. Senthil Kumar3-Mar-07 7:32

S. Senthil Kumar

3-Mar-07 7:32

If an object implements IDisposable, then it most probably implements a finalizer too. In that case, you cannot call Dispose outside the if (disposing) {...} block. The unmanaged resource cleanup is only for unmanaged resources that don't have a Dispose/Finalizer (things like handles you opened yourself).

protected void Dispose(bool disposing)
{
   if (disposing)
   {
      // Call Dispose/Close on all disposable objects
   }

   // Call Stuff like CloseHandle on handles you directly obtained via P/Invoke.
}

Regards
Senthil [MVP - Visual C#]
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