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windowswinformsvideocamerawebcam
Brian Hanf
Brian Hanf

Reputation: 564

webcam, Video Source dialog comes up

So have seen a ton of people with the same issue's but no answers. My SendMessage pop's up the "Video Source" dialog box on a windows 7 laptop with one camera. I have Cyber Link YouCam installed. 'Video Source' dialog box

If I uninstall Cyber Link YouCam the "Video Source" dialog goes away. It appears to be the OS is acting as though YouCam is a second driver for the same device. My question is how do I stop the dialog box for "Video Source" from appearing? Once I choose an option in the dialog I don't get the dialog box (until I restart the application) so there must be a setting somewhere being set.

Though debugging found this bit of code (see whole section below) is the one that seems to be the one that calls the dialog box - SendMessage (deviceHandle, WM_CAP_CONNECT, deviceno, ((IntPtr) 0).ToInt32 ())

 public void StartWebCam (int height, int width, int handleofthepicturebox, int deviceno)
        {

        string deviceIndex = "" + deviceno;

        deviceHandle = capCreateCaptureWindowA (ref deviceIndex, WS_VISIBLE | WS_CHILD, 0, 0, width, height, handleofthepicturebox, 0);


        if (SendMessage (deviceHandle, WM_CAP_CONNECT, deviceno, ((IntPtr) 0).ToInt32 ()) > 0)
            {


            SendMessage (deviceHandle, WM_CAP_SET_SCALE, -1, 0);
            SendMessage (deviceHandle, WM_CAP_SET_PREVIEWRATE, 0x42, 0);
            SendMessage (deviceHandle, WM_CAP_SET_PREVIEW, -1, 0);

            }
        else
            {
            // nothing failed maybe some clean up needed
            }

        }

So again the question is - how do I stop the dialog box for "Video Source" from appearing?

Upvotes: 1

Views: 11031

Answers (5)

carabez
carabez

Reputation: 53

Came over here searching for a solution for the "WM_CAP_DRIVER_CONNECT" and "Video Setup" dialog popup Error.

FOUND the solution:

It's a driver problem. Use the OEM's driver, because the Generic Microsoft Drivers are NOT working for your camera.

Use www.astra32.com to find out the USB camera's device info: Manufacturer or Model; then google for the correct drivers.

Good Luck!

Upvotes: 0

cappcorp
cappcorp

Reputation: 11

With this solution it works perfect. The GetTickCount() waiting for events worked along with calling the function until it returned true.

Private Sub PreviewVideo(ByVal pbCtrl As PictureBox)    
    hWnd = capCreateCaptureWindowA(VideoSource, WS_VISIBLE Or WS_CHILD, 0, 0, 0,
   0, pbCtrl.Handle.ToInt64, 0)    
    Dim IniTime As Long = GetTickCount() 
    While GetTickCount() < (IniTime + 1000)
        Application.DoEvents()
    End While    
    Dim OKAnswer As Boolean = False
    For xretries As Integer = 1 To 10
          ' I'll give you Only 10 tries to connect, otherwise I AM LEAVING MICROSOFT!
          OKAnswer = SendMessage(hWnd, WM_CAP_DRIVER_CONNECT, VideoSource, 0)
          If OKAnswer Then
              Exit For
          End If    
    Next    
    If okanswer Then
          SendMessage(hWnd, WM_CAP_SET_SCALE, True, 0)
          SendMessage(hWnd, WM_CAP_SET_PREVIEWRATE, 30, 0)
          SendMessage(hWnd, WM_CAP_SET_PREVIEW, True, 0)
          SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, pbCtrl.Width, pbCtrl.Height, SWP_NOMOVE Or SWP_NOZORDER)    
    Else
          DestroyWindow(hWnd)    
    End If    
End Sub

Upvotes: 1

Theo
Theo

Reputation: 536

Finally I Found a solution for this.
The problem happens in Windows 7 / 8

First you need this API function

Private Declare Function GetTickCount Lib "kernel32" () As Long

Then... after you call capCreateCaptureWindowA() you have to wait 1 second processing events, (note: sleep don't work the same)

IniTime = GetTickCount()
While GetTickCount() < (IniTime + 1000)
   DoEvents
Wend

then you call WM_CAP_DRIVER_CONNECT (maybe a couple of times).. and THAT's IT ... no more video source dialog

Upvotes: 1

limcy_at_mip
limcy_at_mip

Reputation: 5693

I had the same issue. Make sure you call capDriverDisconnect once you no longer need the webcam. Note that I'm using Logitech C110, but I suppose it should work in your case too.

Upvotes: 0

slv
slv

Reputation: 726

I developed a form to display two live captures with avicap32 on Windows XP. There is a chance the fix I found in my case also applies to yours.

In the case of avicap, it is possible to programmatically manage your webcams, and all that is registry-based. Here is the thread I found to guide me and achieve what I wanted.

In this thread, the role of the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources\msvideo\MSVideo.VFWWDM\DevicePath registry key is highlighted for the selection of the active webcam.

And here is maybe a helpful piece of info: I had to set the value in lowercase to avoid the Video Source dialog popping up.

I determined it by monitoring the registry key before and after the call to SendMessage with WM_CAP_CONNECT.

To the best of my knowledge (and googling), nobody else has offered a fix, so even though I might be answering a little late, it would be great if you could tell us whether it worked for you as well.

Upvotes: 3

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