Specifications

PICED FAQ

Page 37

Solution #2

Use a Web Cam Image Component to show the JPEG images from a web cam. In this case, the

software continually retrieves JPEG images from the web cam and displays them, one after the

other.

This has the following advantages over using a HTML component :

It will work for all web cams

No ActiveX or other components are needed

It is drawn directly on the page, meaning :

you don't have problems with the user clicking on links etc on the web cam image

the component can be stretched and Alpha Blended

editing is simpler

The disadvantages of using a web cam image component are :

It can be tricky to determine the URL needed to return a single JPEG image.

If you are displaying multiple web cam images on one page, the images from each camera will

be retrieved in turn. If an image can not be retrieved from a particular web cam, there will be a

delay while the software waits for a reply. This will cause all of the other web cams to stop briefly

(about 10 seconds).

Note that new web cam types can be added to the Web Cam Wizard. The WebCam.csv file

contains a list of web cams. This file contains three or five fields of data, separated by commas :

Manufacturer

Model

URL format

Default User Name (optional)

Default Password (optional)

The URL format is the URL needed to obtain a JPEG image from the camera, but with the IP

Address replaced with "%IPAddress%". If you need to use a comma anywhere in the file (other

than for separating the fields), insert the text "%comma%" where the comma should be.

See also Problems with displaying HTML, Problems with displaying HTML (Colour C-Touch)

1.4.1.9 Problems with displaying HTML

Problem

You are using HTML or Web Cam Image components, but the content is not being displayed.

Solution #1

Check that the computer is connected to Ethernet. Check that an Ethernet cable is plugged in and

that the LEDs are lit.

Solution #2

Check that the computer is on the same subnet as the computer serving the web page (i.e. check

the IP Addresses and subnet mask). To find the IP Address and Subnet mask :

1. Select

Start | Control Panel | Network Connections

2. Select your network adaptor (double click on it to open).

3. Select the

Support

tab.

Solution #3

Check that the computer is connected to the Internet. Open a web page with a web browser on the