Re: Capturing from Webcam without preview to the user - C# Discussion Boards

Eddy didn't mean illegal activity, but more of the legality of having a person on camera. You may need to have consent from the person or some notification that they are being filmed.

"I've seen more information on a frickin' sticky note!" - Dave Kreskowiak

Ultimately the webcam image is just a stream of bytes. That's all you need to know to work out the rest.

Yes. But how do I do it without showing it on the image control?

It's a stream of bytes. The image control just renders the bytes out - it's a convenience for you. You don't need it. Think about how you save a stream of bytes instead - that's the key. Forget that the Image Control ever existed.

This is where I failed to implement. Can you please share with me a few codes so I could understand the fact to store the stream anything other than the image control and grab the current from that variable?

You already have the code. All you need to do is use a FileStream instead of a MemoryStream to write the bytes out to a file.

Still cannot figure out. Please help the novice.

Please find below the extarct of my application where the stream is stored in an image control named frameHolder and function SavePic grabs the current frame and save it to disk. frameHolder is shown on the Main Window. Making it invisible captures blank picture.

MainWindow.xaml.cs

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
LoaclWebCamsCollection = new FilterInfoCollection(FilterCategory.VideoInputDevice);
LocalWebCam = new VideoCaptureDevice(LoaclWebCamsCollection[0].MonikerString);
LocalWebCam.DesiredFrameSize = new System.Drawing.Size(320, 240);

//MessageBox.Show(LocalWebCam.DesiredFrameSize.ToString());
LocalWebCam.NewFrame += new NewFrameEventHandler(Cam_NewFrame);

LocalWebCam.Start();

}

void Cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
BitmapImage bi = new BitmapImage();
try
{
img = (Bitmap)eventArgs.Frame.Clone();

MemoryStream ms = new MemoryStream();
img.Save(ms, ImageFormat.Bmp);
ms.Seek(0, SeekOrigin.Begin);

bi.BeginInit();
bi.StreamSource = ms;
bi.EndInit();

bi.Freeze();
Dispatcher.BeginInvoke(new ThreadStart(delegate
{
frameHolder.Source = bi;
}));

}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "NW CDM Test of Image Capture Failed");
}
}
Sultan Uz Zaman at 4 hrs ago
Reply Modify the comment. Delete the comment.
A button click event does the follwoing to save the pic:

public static void SavePic(string imageFile)
{
//Cam_NewFrame(null,null);
//image1.Source = frameHolder.Source;
//Image frame = frameHolder.Cam_NewFrame(null,null);
// Release any previous buffer

MainWindow myWin = Application.Current.MainWindow as MainWindow;
RenderTargetBitmap bitmap = new RenderTargetBitmap(320, 240, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(myWin.frameHolder);

using (FileStream stream = File.Create(Global.xImageLocation+"\\"+imageFile)) // or .png
{
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.QualityLevel = 90;
encoder.Frames.Add(BitmapFrame.Create(bitmap));
encoder.Save(stream);
}
}

Didn't you just post a code dump about this the other day? If so, what part of the code doesn't work?

"I've seen more information on a frickin' sticky note!" - Dave Kreskowiak

Friends i use this code to get image from database
and show it on picturebox1
but i am getting
this error
system.drawing.image.fromstream(stream stream,boolean ....)
in database column datatype is varbinary(MAX)

byte[] data = new byte[0];
data = (byte[])(dsetName.Tables[0].Rows[0]["picture"]);
MemoryStream mem = new MemoryStream(data);
pictureBox1.Image = Image.FromStream(mem);

if there is some thing missing in my code than suggest me

You haven't actually told us what error you're getting.

error is Parameter not valid and

system.drawing.image.fromstream(stream stream ,boolean)

See here: Why do I get a "Parameter is not valid." exception when I read an image from my database?[^]

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

in my program a sending some text to an active windows.

i send like this:

C#

.
.
.
MSG = lblMSG.Text.Trim();
SendKeys.Send(MSG);
SendKeys.SendWait("{ENTER}");
SendKeys.Flush();

the problem is - sometime the string Changing for no reason.

for example:

9999.999 ==> 9999.9999

9999.999 ==> 999.999
why ?

Message Closed

modified 7-Sep-15 5:20am.

Is there a question or problem? This looks just to be a code dump.

"I've seen more information on a frickin' sticky note!" - Dave Kreskowiak

Just code dump

I have removed your code. The forums in Code Project are not intended to act as a personal back-up store for code.

That's what I wondered about it looking like a code dump. He could at least write an article on it if he wanted to share it with the community Roll eyes | :rolleyes:

"I've seen more information on a frickin' sticky note!" - Dave Kreskowiak

All i found is real matrix svd, i want complex matrix. so i need help ,please .thank you.
i want c# lib.

Hi

I am calling a SSRS report from C#. A main report and a subreport in it.

The main report is working correctly but the subreprot is showing The subreport 'Name' could not be found at location

I put the main report and subreport in the bin folder.

Please find the code used by me as below

C#

sqlcomm = new SqlCommand("mainreport query", conn);           
 SqlDataAdapter dataAdapter = new SqlDataAdapter(sqlcomm);            
dataAdapter.Fill(dataset);            
this.reportViewer1.ProcessingMode = ProcessingMode.Local;            
this.reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\sale_dept.rdl";           
this.reportViewer1.LocalReport.DataSources.Clear();
this.reportViewer1.LocalReport.DataSources.Add(new Microsoft.Reporting.WinForms.ReportDataSource("DataSet1", dataset.Tables[0]));   
         this.reportViewer1.LocalReport.SubreportProcessing += new SubreportProcessingEventHandler(addsubreport); 
this.reportViewer1.LocalReport.Refresh(); 
this.reportViewer1.RefreshReport();
private void addsubreport(object sender, SubreportProcessingEventArgs e)       
 {            
SqlConnection conn = new SqlConnection(source);  
DataSet dataset = new DataSet();
conn.Open(); 
SqlCommand sqlcomm = new SqlCommand("subreport query", conn); 
 SqlDataAdapter dataAdapter = new SqlDataAdapter(sqlcomm); 
dataAdapter.Fill(dataset); 
e.DataSources.Add(new ReportDataSource("discount", dataset.Tables[0])); 
}

When i done debug with breakpoint it found that the eventhandler is not getting fired.

The control is not going to the 'addsubreport' event handler. I am stucked here Frown | :(

please help

Hi guys,

I want to using Cutter for cut an image(.svg) with a definition layout image (.png, .svg, .plt) by winform (C#).
So, I don't know how to do it. Please suggest me some solutions.
What format of definition layout image can I use for that? (.png or .svg or .plt)

Images example:
Image for cutting: here
Layout: here

Thanks you.

This is not a good question - I have no idea what you are goign on about.
What is "Cutter"? I dunno.
What are you trying to do? I dunno.
What does it have to do with C#? I dunno.
Am I going to follow random links which start "appbox"? Nope. Dunno what is on the other end, and don't want to find out the hard way.

And we can't see your screen, access your HDD, or read your mind. We only get what you give us to work with.

So explain what you are trying to achieve, tell us what problem you are having, explain what you have tried, tell us where you are stuck, and what help you need. And don't post links to random sites.
But at the moment, we can't help you.

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

Sorry!!!
>>What is "Cutter"? I dunno
I mean cutting machine.
>>What are you trying to do? I dunno.
I need the vector images drawn into vector line drawings for an cutting machine to read and cut them.
>>What does it have to do with C#? I dunno.
I want to use C# (Winform)

phinq1910 wrote:
I mean cutting machine.

Well that's not exactly narrowing it down and completely useless.

Do you have some kind of command and control software for this machine or a manual on what language it understands? You better because you're dead in the water without it.

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

Dave Kreskowiak