PictureBox to Bitmap or Image?

I am trying to change the code http开发者_如何学Python://sites.google.com/site/webcamlibrarydotnet/winfrom-and-csharp-sample-code-and-download from picture box to image or bitmap as I dont want to display any image or plan to display, all I want is that it will output the image to file.

I have tried changing the webcam.cs from PictureBox _FrameImage to Bitmap _FrameImage and PictureBox ImageControl to Bitmap ImageControl and casting (Bitmap) at e.WebCamImage

As well as changing it on the main form:

private void bWebcam_Click(object sender, EventArgs e)
{
    WebCam webcam = new WebCam();
    Bitmap image = null;
    webcam.InitializeWebCam(ref image);

    webcam.Start();
    webcam.Stop();

    FileStream fstream = new FileStream("testWebcam.jpg", FileMode.Create);
    image.Save(fstream, System.Drawing.Imaging.ImageFormat.Jpeg);
    fstream.Close();
}

• Unhappyly it doesnt seem to work so how could I change it from picture box to Bitmap or Image or similar storage before saving it to a file or save it to file directly ?

The source code I am using is: http://sites.google.com/site/webcamlibrarydotnet/winfrom-and-csharp-sample-code-and-download

Instead of using the WebCam class, why not just use the WebCamCapture class directly (since you are not displaying this in a form) and handle the ImageCapture event directly. The event argument for the event contains the Image. You could, in the event handler save the image to disk. Alternately, if you want to use the sample and the WebCam class, and you have a form. Use a PictureBox but leave it hidden (set Visible to false) and then just copy the image from there and save to disk when you need to.

Here is some sample code of using the WebCamCapture class instead of the WebCam class. It should be noted that this code is based on the sample code from the link provided in the question. I have kept the style of the sample so that code lines up.

Edit: Adding example of using WebCamCapture instead of WebCam class. This code should be used to modify Form1.cs in the sample code.

// Instead of having WebCam as member variable, have WemCamCapture
WebCamCapture webCam;

// Change the mainWinForm_Load function
private void mainWinForm_Load(object sender, EventArgs e)
{
    webCam = new WebCamCapture();
    webCam.FrameNumber = ((ulong)(0ul));
    webCam.TimeToCapture_milliseconds = 30;
    webCam.ImageCaptured += webcam_ImageCaptured;
}

// Add the webcam Image Captured handler to the main form
private void webcam_ImageCaptured(object source, WebcamEventArgs e)
{
    Image imageCaptured = e.WebCamImage;
    // You can now stop the camera if you only want 1 image
    // webCam.Stop();
    // Add code here to save image to disk
}

// Adjust the code in bntStart_Click
// (yes I know there is a type there, but to make code lineup I am not fixing it)
private void bntStart_Click(object sender, Event Args e)
{
    webCam.Start(0);
}

Using reflector you can see that internally the WebCam class uses a timer to simulate a framerate. Therefore calling start and stop right after each other will never generate an image since the application doesnt handle application events (and therefore the timer tick event) in between starting and stopping. You should register on the ImageChanged event and call stop in there.

Good luck

** Edit: the start logic **

public void Start(ulong FrameNum)
{
    try
    {
        this.Stop();
        this.mCapHwnd = capCreateCaptureWindowA("WebCap", 0, 0, 0, this.m_Width, this.m_Height, base.Handle.ToInt32(), 0);
        Application.DoEvents();
        SendMessage(this.mCapHwnd, 0x40a, 0, 0);
        SendMessage(this.mCapHwnd, 0x432, 0, 0);
        this.m_FrameNumber = FrameNum;
        this.timer1.Interval = this.m_TimeToCapture_milliseconds;
        this.bStopped = false;
        this.timer1.Start();
    }
    catch (Exception exception)
    {
        MessageBox.Show("An error ocurred while starting the video capture. Check that your webcamera is connected properly and turned on.\r\n\n" + exception.Message);
        this.Stop();
    }
}

In WebCam.cs you have:

public void InitializeWebCam(ref System.Windows.Forms.PictureBox ImageControl)
{
    webcam = new WebCamCapture();
    webcam.FrameNumber = ((ulong)(0ul));
    webcam.TimeToCapture_milliseconds = FrameNumber;
    webcam.ImageCaptured += new WebCamCapture.WebCamEventHandler(webcam_ImageCaptured);
    _FrameImage = ImageControl;
}
void webcam_ImageCaptured(object source, WebcamEventArgs e)
{
    _FrameImage.Image = e.WebCamImage;
}

If you modify the ImageCaptured code you can do what you want: e.WebCamImage is an Image.
for example you could change/add constructor to accept a file name and, in the ImageCaptured event, you could save image to file.