Re: How to convert byte[] to Stream - C# Discussion Boards

Pete O'Hanlon20-Mar-09 6:24

Pete O'Hanlon

20-Mar-09 6:24

Michael Schubert wrote:
It would appear that you have encountered some kind of keyboard malfunction. I suggest you fix this first and then come back here to ask your questions.

That's what happens when you drool on your keyboard, you end up gumming up the keyboard. I think this is what they mean by sticky keys.

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As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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MumbleB20-Mar-09 6:53

MumbleB

20-Mar-09 6:53

Sounds more like 10yr old to me.

Excellence is doing ordinary things extraordinarily well.

Michael Schubert20-Mar-09 7:11

Michael Schubert

20-Mar-09 7:11

You think they don't drool?

led mike20-Mar-09 8:33

led mike

20-Mar-09 8:33

Kwagga wrote:
Sounds more like 10yr old to me

Nah, just another poor soul that was conscripted into service of yet another outsourcing company.

Luc Pattyn20-Mar-09 8:15

Luc Pattyn

20-Mar-09 8:15

It may also cause an echo. Big Grin | :-D

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Mbah Dhaim20-Mar-09 11:20

Mbah Dhaim

20-Mar-09 11:20

then you should call it in form "constructor" not "Form Load event"

dhaim
ing ngarso sung tulodho, ing madyo mangun karso, tut wuri handayani. "Ki Hajar Dewantoro"
in the front line gave a lead, in the middle line build goodwill, in the behind give power support

20-Mar-09 3:42

20-Mar-09 3:42

Message Removed

musefan20-Mar-09 4:15

20-Mar-09 4:15

instead of making a byte[] why dont you do your editting directly to the bitmap and then use the bitmap save function create the output file you want

Life goes very fast. Tomorrow, today is already yesterday.

20-Mar-09 4:47

20-Mar-09 4:47

Message Removed

musefan20-Mar-09 4:51

20-Mar-09 4:51

well then you dont want to be working with an array of image pixels cuz they will always be valid values

Whats you error?

Life goes very fast. Tomorrow, today is already yesterday.

Luc Pattyn20-Mar-09 4:18

Luc Pattyn

20-Mar-09 4:18

Hi Collin,

Not every stream/file constitutes a valid image; what Image.FromStream() accepts is the streamed content of an image file, as Image.FromFile() would expect. There is more to an image than just a bunch of RGB values; it needs dimensions, pixel depth information, maybe a color lookup table, compression information, etc.

Now what is it you want to achieve? You already have a valid image to start with, so why not modify it rather than copying/modifying its pixels, then work from there.

FYI: setting every third byte to 255 produces red only if (1) you do have a 24bpp image (which would be exceptional, most .NET images are 32bpp) and (2) the image is sufficiently dark (a white pixel will remain white, a yellow one will remain yellow)

BTW: in general when getting an exception, you should look at it; when posting a message, you should report it, that could help getting more and better replies sooner. In this particular case, you were bound to get an ArgumentException telling you not much except the one argument wasn't good enough...

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

20-Mar-09 4:46

20-Mar-09 4:46

Message Removed

Luc Pattyn20-Mar-09 5:00

Luc Pattyn

20-Mar-09 5:00

Hi Collin,

if you want to convert an existing image into a stream, use an Image.Save overload that deals with streams i.e. Image.Save(Stream, ImageFormat).

the code you have shown does NOT deal with an image, it only handles pixel data; I suggest you don't try and convert pixel data back into a valid image, just use the existing .NET classes (Image, Bitmap), they know about several image formats.

FWIW: if you are having trouble turning an image into a stream (say a MemoryStream), then reading it back from that stream, chances are you forgot to "rewind" the stream between writing and reading, i.e. to reposition it at its beginning.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Fayu20-Mar-09 4:45

Fayu

20-Mar-09 4:45

You can use the System.IO.MemoryStream object to do this.

byte[] buffer;
MemoryStream ms=new MemoryStream(buffer);

Hope this helps.

20-Mar-09 4:49

20-Mar-09 4:49

Message Removed

Fayu20-Mar-09 4:53

Fayu

20-Mar-09 4:53

Post the exception type and exception message.

Rich text to canvas

damichab20-Mar-09 3:29

damichab

20-Mar-09 3:29

Hi,

I am trying to get some rich text (from a RichTextBox.Rtf) onto a bitmap but can't seem to find a way to do it.

The key lines of my code are...

Bitmap      Canvas = new Bitmap(200, 200, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Graphics    Artist = Graphics.FromImage(Canvas);

Artist.PageUnit = GraphicsUnit.Pixel;
Artist.DrawString("Hello", descFont, descBrush, rect, descFormat);

It would have been nice if there were a:

Graphics.DrawRTF(string richText, Rectangle rect)

method, but there isn't.

What is usually done as a replacement? Any help or pointers appreciated.

Regards,

David Bailey.

musefan20-Mar-09 3:54

20-Mar-09 3:54

Whats wrong with the 4 lines of code you already posted?

Life goes very fast. Tomorrow, today is already yesterday.

damichab20-Mar-09 4:04

damichab

20-Mar-09 4:04

Hi musefan,

I am trying to display RichText not plain text. Or are you saying that the DrawString() command handles rich text as well?

-David.

musefan20-Mar-09 4:08

20-Mar-09 4:08

No, DrawString() will not auto handle your formatting.

Have a look at this[^] for some ideas.

You could always handle yourself by iterating through each word in the richtextbox then getting its formatting(color, font etc.) before drawing it to the graphics object.

Life goes very fast. Tomorrow, today is already yesterday.