Question about webcam

Posted on 2002-03-10
Medium Priority
Last Modified: 2008-02-01
I made a control that connects to the webcam.
The problem is that when trying to connect to the webcam if the webcam is already in use a screen comes up asking the user to select a different webcam device.

I am using this function to call the connect to the webcam device:

function capDriverConnect(ByVal hCapWnd as Long, Optional ByVal i as long = 0&) as Boolean
    capDriverConnect = SendMessageAsLong(hCapWnd, WM_CAP_DRIVER_CONNECT, i, 0&)
end function

So, basically what I want is a function to check if the specified web cam is in use or not; or else a function that tries to connect to the web device and if it is in use it will just not connect rather then prompt the user with a screen to select another device.
Question by:Joshyy
  • 2

Expert Comment

ID: 6854607

Expert Comment

ID: 6857237
Try this, it's got most of the code you're looking for...
it's more complicated than you're asking for, but it's also quite complete...


let me know if this suits your needs...

Author Comment

ID: 6861790
sorry Smokintbird... but I already made a web cam device ... the problem is that if the webcam device is already in use (by another program) when you start "your" program a screen comes up asking you to select a different web cam... it is this that i want to stop from happening.

Accepted Solution

Smokintbird earned 400 total points
ID: 6862983
first off, the function you're using is calling "WM_CAP_DRIVER_CONNECT"...
the code you should be looking at, is the value of "WM_CAP_START" at the time it attempts to connect.
set a breakpoint after it gets that variable, and find out it's value when the device is in use and when it's not...

then simply put an if-then statement in to trap for the used state...
if used, then bail out or pop a message box or something...

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