[C #] #100 call the camera,

[C #] #100 call the camera,

Requirement: because the project needs to get the user's profile picture, you need to use C # To call the camera to get the profile picture.

Below is a method to call the camera.

Case: call a DEMO of the camera 【]

Class library used: AForge. dll [Demo download, Demo contains class library]

1. Detect camera devices on the computer

FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

 

Use Count to determine the number of camera devices. If there is no camera, an exception will be thrown. If there is a camera, add it to the drop-down box.

if (videoDevices.Count == 0)           throw new ApplicationException(); foreach (FilterInfo device in videoDevices) {           tscbxCameras.Items.Add(device.Name); }

 

2. Connect the camera

After detecting the camera, you can connect to the camera to obtain the image.

// Select VideoCaptureDevice videoSource = new VideoCaptureDevice (videoDevices [tscbxCameras. selectedIndex]. monikerString); // you can specify the size of the videoSource image. desiredFrameSize = new Size (320,240); videoSource. desiredFrameRate = 1; // sets the videPlayer for the image obtained by the camera control. videoSource = videoSource; // enable the camera videPlayer. start ();

 

3. Disable the cameraYou can also disable it by using the Stop () method]

videPlayer.SignalToStop();videPlayer.WaitForStop();

 

 

Run the Demo:

There is one more project: draw the picture on the camera

Img = new Bitmap (102,126, PixelFormat. format24bppRgb); // sets the image size and number of digits videPlayer. drawToBitmap (Bitmap) img, new Rectangle (0, 0, videPlayer. width, videPlayer. height); // draw the image to the Img object videPicture. image = img; // displayed on the PictureBox Control

 

I encountered a problem here, that is, the common error of GDI + 【Cause: Resource usage]

Problems:

1. When modifying personnel information, read the image file locally and assign the value to PictureBox.

2. Save the PictureBox image to the local hard disk.

Solution :【Remove image resource usage]

1. Read the local image and copy it in depth.

2. Assign the copy of the deep copy to PictureBox.

3. Disable local image resources

# Region: Copies images in depth and disables resources to prevent the use of images in depth. In addition, img = new Bitmap (path) is disabled ); image bmp = new Bitmap (img. width, img. height); Graphics draw = Graphics. fromImage (bmp); draw. drawImage (img, 0, 0); draw. dispose (); img. dispose (); videPicture. image = bmp; # endregion

Project: