Create RGB Image - C# Discussion Boards

San@Coding6-Aug-07 16:35

6-Aug-07 16:35

hi i want to read the pen drive autorun file and want to add my own file there at startup.
Secondly from where can i get information about what happens when any drive is double-clicked.

thanx in advance

Real helpful error message! NOT

Mike Hankey6-Aug-07 16:19

Mike Hankey

6-Aug-07 16:19

Hey ya'll

Has anyone ran across this error in VS2005? WTF?

"The designer loader did not provide a root component but has not indicated why."

As a general rule doesn't display this message the designer just doesn't display anything so I have to reload it after every change?

Thanks,
Mike WTF | :WTF:

Life is not measured by the number of breaths we take, but by the
moments that take our breath away. "George Carlin"

Referencing exe project

MAW306-Aug-07 15:56

MAW30

6-Aug-07 15:56

I get the following error when trying to reference my .exe project:

Error 3 The type or namespace name 'FormAAACS' could not be found (are you missing a using directive or an assembly reference?) C:\BBB.cs 45 9 CCCLib

There is already a reference to the Library but when I try to pass information from my Library to my .exe project the compiler doesn't recognize the "using BBB(namespace)" for the .exe project.

I appreciate any help, thanks in advance.
Michael

Re: Referencing exe project

Luc Pattyn7-Aug-07 2:18

Luc Pattyn

7-Aug-07 2:18

an EXE or DLL project can refer to another DLL project by:
- adding a reference in the Solution pane
- and adding a using statement, mentioning the required namespace

AFAIK an EXE or DLL project can not refer to another EXE project.

If that does not help, watch the file name and line number of the error message.
And make Visual display line numbers !!!

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/AllLanguages/General
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google

Re: Referencing exe project

MAW307-Aug-07 9:33

MAW30

7-Aug-07 9:33

The problem is that I have a dll which is a member of the same solution as the exe project, but the dll does not recognize the exe, yet the exe recognizes the dll.

Interface blues

seanwright6-Aug-07 15:28

seanwright

6-Aug-07 15:28

Ok, I got a piece of code and I can't seem to compile it... I don't quite know how to ask the question so here goes. I have the following code:

public interface X : _Collection
{

[DispId(0)]
Y this[object ]
{
get;
set;
}
}

Where Y is another interface.

I get an 'Identifier expected' message when I compile. Can anyone explain this code and a possible solution?

Thanks!

Re: Interface blues

Guffa6-Aug-07 15:35

Guffa

6-Aug-07 15:35

You have forgotten to give the argument in the indexer a name.

Y this[object index]

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

Create RGB Image

iuri_figueiredo6-Aug-07 12:07

iuri_figueiredo

6-Aug-07 12:07

Hello friends, Wink | ;)

I’m trying to elaborate one program capable of create one image based on RGB data.
In this case, I receive RGB values one by one (i.e. serial) … for example,

for (int posX = 0; posX < 200; posX++)
{
______for (int posY = 0; posY < 200; posY++)
______{
____________color = Color.FromArgb(r, g, b);
____________bitmap.SetPixel(posX, posY, color);
______}
}

Where bitmap is 200x200 image and r, g and b contains the RGB values received in serial. But this is too slow ... Cry | :((

So I ask if there is anyone that have a better way to do this ... for instance, if there is any class that build three arrays (R, G and B) and define them as one image, instead of building the image pixel by pixel. Blush | :O

Thank you so much for your attention ... best regards, Big Grin | :-D

Iuri Figueiredo :->

Re: Create RGB Image

Luc Pattyn6-Aug-07 12:24

Luc Pattyn

6-Aug-07 12:24

Hi,

are you receiving the pixel values over a serial line ?
if so 200 * 200 * 3 = 120KB assuming 8-bit per color component.
At say 9600 Bd (=1000 B/s) this will take 2 minutes to transfer.

If your data source is much faster than that, the lack of speed
would be caused by the SetPixel method itself; there is a faster
approach using unsafe code and pointers.

There are some fine articles on this, search for "image" and
author "Christian Graus".

But first tackle your image source sitation !

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: Create RGB Image

iuri_figueiredo6-Aug-07 12:55

iuri_figueiredo

6-Aug-07 12:55

Well, to be honest, the data will arrive from one CMOS camera with JPEG encoder:

http://www.sparkfun.com/commerce/product_info.php?products_id=7906

I don’t have this working for know (because I’m waiting for this component), but I was figuring out how I would receive the data. They say that:

“The Parallel Video Interface (PVI) generates the video output of the TC5747. The interface consists of a vertical frame-start signal and a 10-bit parallel data bus with clock and qualify signals. It supports parallel and serial modes of operation. The PVI produces a clock signal (the CLK_OUT pin), a 10-bit data bus, DOUT[9 Blush | :O

] and qualifying signals that are synchronous to that clock. On each determining edge of CLK_OUT, a single data byte is transferred on the data bus, if qualified by the VALIDH signal. The DOUT[9 Blush | :O

] bus carries either the Bayer grid data, the YUV 4:2:2 output data, the RGB data (RGB565, RGB666 or RGB444) or JPEG code according to the TCIF_OUTPUT_FORMAT host command.”

So it seems that RGB data come at 10-bit parallel … however, I still don’t understand the difference between RGB data and JPEG data. Confused | :confused:

Re: Create RGB Image

Luc Pattyn6-Aug-07 13:09

Luc Pattyn

6-Aug-07 13:09

Hi,

sounds quite different already. This is how I understand it:

you buy/get a camera (or is it just a CMOS chip, or possibly a chip+lens ?), it has
a "PVI" interface (which I never heard of). And it will provide an image in JPEG format.

The good thing is:
JPEG is a file format for storing compressed images. If you have a JPEG file
(typically the extension is .jpg or .jpe or .jpeg) then you can simply obtain the
image using: Bitmap bm=Image.FromFile(filepath); or Image.FromStream(stream);
Hence you are not involved in individual pixels, in RGB, and all the gory details.

The bad thing is: your PC does not speak PVI, does it ?
Googling "Parallel Video Interface" only gives about 600 hits; you may want to read some,
but my first impression is PVI is not an official standard, so you may not be able
to buy an interface board that plugs into your desktop PC, or a box that converts PVI
to something more familiar that is available on your desktop or notebook.
So you better ask whoever offers the camera to also offer the PC interface, including
both the hardware board or box AND the driver to work with it; it should offer an API,
which probably will be an unmanaged API, so you would then need a wrapper that
applies P/Invoke to it, before you can use it in .NET

I think you can safely forget Bitmap.SetPixel() for now, and should start solving
your interface problem first.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: Create RGB Image

Liam O'Hagan6-Aug-07 16:10

Liam O'Hagan

6-Aug-07 16:10

I think the product he's talking of is the CMOS camera hardware, designed to work in an embedded device with a microcontroller (i.e. mobile phone camera)

He should check out the SparkFun forums, they and quite good and someone may have already worked out his solution.

I have no blog...

Re: Create RGB Image

iuri_figueiredo7-Aug-07 7:22

iuri_figueiredo

7-Aug-07 7:22

Exactly

I will use a PIC (microcontroller) to send CMOS camera data trough Ethernet (TCP/IP Protocol) in order to see captured images. Since they guarantee that this camera send image with RGB values or JPEG data, I would like to know in advance if anyone know what’s the difference between them.

Anyway, what happens if I choose to build an image with RGB values? Is there any suggestion to speed the process? (Remember that this time I receive 10 RGB values at one time).

Best regards and thank you so much for your precious patient Poke tongue | ;-P

Iuri Figueiredo :->

Use FindControl

pariisa6-Aug-07 11:36

pariisa

6-Aug-07 11:36

hi,
help me...
in my Asp project, there is 80 RadioButton in the
Default.aspx page.
I want to set the All text of RadioButton from My DataBase.
I select a Data table from My DataBase with 80 rows.
But I don`t Want to set Text with this format :

RadioButton1.Text = dt.Rows[0][0];
RadioButton2.Text = dt.Rows[0][1];
.
.
.
RadioButton80 .Text = dt.Rows[0][80];

I want to Use this codes :

RadioButton rb;
for(int i=1 ; i < 81 ; i++)
{
rb = (RadioButton)this.FindControl("RadioButton" + i );
rb.Text= dt.Rows[0][i].ToString();
}
But there is error with Details : Object reference not set to an instance of an object.

why???
please help me to find correct way.

Re: Use FindControl

Luc Pattyn6-Aug-07 11:49

Luc Pattyn

6-Aug-07 11:49

There is no reason to start a new thread; did you read my earlier reply and try it ?

Luc Pattyn [Forum Guidelines] [My Articles]

Use Findcontrol

pariisa6-Aug-07 11:30

pariisa

6-Aug-07 11:30

hi,
help me...
in my Asp project, there is 80 RadioButton in the
Default.aspx page.
I want to set the All text of RadioButton from My DataBase.
I select a Data table from My DataBase with 80 rows.
But I don`t Want to set Text with this format :

RadioButton1.Text = dt.Rows[0][0];
RadioButton2.Text = dt.Rows[0][1];
.
.
.
RadioButton80 .Text = dt.Rows[0][0];

I want to Use this codes :

RadioButton rb;
for(int i=1 ; i < 81 ; i++)
{
rb = (RadioButton)this.FindControl("RadioButton" + i );
rb.Text= dt.Rows[0][i].ToString();
}
But there is error with Details : Object reference not set to an instance of an object.

why???
please help me to find correct way.

Re: Use Findcontrol

Luc Pattyn6-Aug-07 11:33

Luc Pattyn

6-Aug-07 11:33

pariisa wrote:
rb.Text= dt.Rows[0][i].ToString();

i-1

please read and apply my sig !

Luc Pattyn [Forum Guidelines] [My Articles]

Label Help

RussBus6-Aug-07 10:00

RussBus

6-Aug-07 10:00

I have a label with some text showing the version number of the program on my start up screen. On the start up screen there is an image which the version number is on top of, my problem is when I select transparent as my BackColor it shows up as a gray box. Any help?

Re: Label Help

Hessam Jalali6-Aug-07 10:12

Hessam Jalali

6-Aug-07 10:12

Make the image as BackgroundImage of your form then set the label BackColor to Transparent

Good Luck

Re: Label Help

Dave Kreskowiak6-Aug-07 10:12

Dave Kreskowiak

6-Aug-07 10:12

Controls as not transparent to other controls behind them. What you're really telling the Label control is to take on the properties of the background of the form that's hosting the Label control.

In other words, the Label control uses the background settings of the Form it's on. Transparent is NOT really transparent.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: Multi threads accessing database

led mike6-Aug-07 9:14

led mike

6-Aug-07 9:14

MicealG wrote:
would this cause the error I'm getting?

Yes

time(NULL) [modified]

Blubbo6-Aug-07 8:28

Blubbo

6-Aug-07 8:28

my stupidity! After those 2 responders noted my mixture of c++/c#...

heres' the actual c++ code:

This was written in c++ language... I am wondering is there a way to change that into c#?

example code:

int linecounter = 4;
unsigned char parity = 0; // cksum variable
byte short checksum = 0; // cksum variable
static long RecordTime; // cksum variable
unsigned char beef[256];
RecordTime = time(NULL);
beef[0x0] = RecordTime / (256 * 256 * 256);
beef[0x1] = RecordTime / (256 * 256);
beef[0x2] = RecordTime / 256;
beef[0x3] = RecordTime % 256;
beef[0x4] = linecounter % 256;
for (int i = 0; i < 256; i++)
{
checksum += beef[i];
parity ^= beef[i];
}
beef[0x5] = parity;
beef[0x6] = checksum / 256;
beef[0x7] = checksum % 256;

-- modified at 15:06 Monday 6th August, 2007

Re: time(NULL)

Luc Pattyn6-Aug-07 8:50

Luc Pattyn

6-Aug-07 8:50

Hi,

there would be no problem doing the same in C# if it were a valid and correct C program.

the function time_t time( time_t *timer ); returns current time in seconds;
DateTime.Now can provide that.

there are several problems in the "original" code though:
1. byte is not a keyword in C
2. I would prefer beef to be unsigned since it represents parts of a bigger number
3. the for loop goes to 256, that makes no sense
4. checksum/256 will always be zero; checksum should have been unsigned short.
5. strictly speaking the assignments to beef[] need a cast since it is a downcast

good luck !!

Luc Pattyn [Forum Guidelines] [My Articles]

Re: time(NULL)

Hessam Jalali6-Aug-07 9:02

Hessam Jalali

6-Aug-07 9:02

it seems your code is the mixture C#+ buddy.

maybe this going to help

class Program
{
    static int RecordTime; // cksum variable

    static int time(object obj)
    {
        //your time method I just filled it to see the code is working or not!
        return Environment.TickCount;
    }

   static void Main(string[] args)
    {
        int linecounter = 4;
        byte parity = 0;       // cksum variable
        byte checksum = 0;     // cksum variable

        byte[] beef = new byte[8];

        RecordTime = time(null);
        beef[0x0] = (byte)(RecordTime / (256 * 256 * 256));
        beef[0x1] = (byte)(RecordTime / (256 * 256));
        beef[0x2] = (byte)(RecordTime / 256);
        beef[0x3] = (byte)(RecordTime % 256);
        beef[0x4] = (byte)(linecounter % 256);
        for (int i = 0; i < 256; i++)
        {
            checksum += beef[i%8]; //changed just for preventing from index out of range Exception
            parity ^= beef[i%8];//changed just for preventing from index out of range Exception
        }
        beef[0x5] = parity;
        beef[0x6] = (byte)(checksum / 256);
        beef[0x7] = (byte)(checksum % 256);
    }
 }

and your code don't work in both c# and C++ because the lines I commented

Re: time(NULL)

Guffa6-Aug-07 13:59

Guffa

6-Aug-07 13:59

Please don't change the original post completely. Now you have screwed up the timeline of the thread...

The code is still not correct C++ code. There is no "byte short" data type in C++.

The code that you have posted doesn't even make sense. You calculate the checksum and parity on data that you don't even put in the array. Then you overwrite elements in the array, which renders the checksum and parity totally useless, as the data that was used to calculate them doesn't exist any more.

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

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