digital camera - TWAIN?

[ae_jester]

Hi,

I'm using the capCreateCaptureWindowA API to display video from a digital camera (works fine). A customer sent me an email asking me "does your program uses twain drivers, VFW or WMD to load images from the camera?".

I am 'thinking' the answer is TWAIN, but I have no clue what VFW or WMD is. Is there anyone out there that can answer this question for me??

Thanks in advance!

[Bruce Fox]

Possibly:

Video For Windows (VFW)
Windows Driver Model (WDM)

Industry standard software interface such as Multimedia Control Interface (MCI), Video for Window (VFW), and Windows Driver Model (WDM).


Edit: Is it WMD or WDM?




More:
Microsoft Windows VFW Video Capture
Microsoft Windows WDM Video Capture




Bruce.

[ae_jester]

Do you know which one that API uses though? That is the important question. I found it on planet-source-code a long time ago. I really don't understand any of this stuff...

here is the 'connect' function, which might help answer the question for someone who knows what they are talking about.

Private Function Connect() As Boolean
    Dim lpszName As String * 100
    Dim lpszVer As String * 100
    Dim Caps As CAPDRIVERCAPS
        
    '//Create Capture Window
    capGetDriverDescriptionA 0, lpszName, 100, lpszVer, 100  '// Retrieves driver info
    lwndC = capCreateCaptureWindowA(lpszName, WS_CAPTION Or WS_THICKFRAME Or WS_VISIBLE Or WS_CHILD, _
                                    ScaleX(2000, vbTwips, vbPixels), _
                                    ScaleX(100, vbTwips, vbPixels), _
                                    100, _
                                    120, _
                                    Me.hWnd, 0)
 
    '// Set title of window to name of driver
    SetWindowText lwndC, lpszName
    
    '// Set the video stream callback function
    capSetCallbackOnStatus lwndC, AddressOf MyStatusCallback
    capSetCallbackOnError lwndC, AddressOf MyErrorCallback
    
    '// Connect the capture window to the driver
    If capDriverConnect(lwndC, 0) Then
        '/////
        '// Only do the following if the connect was successful.
        '// if it fails, the error will be reported in the call
        '// back function.
        '/////
        '// Get the capabilities of the capture driver
        capDriverGetCaps lwndC, VarPtr(Caps), Len(Caps)
        
        '// If the capture driver does not support a dialog, grey it out
        '// in the menu bar.
'        If Caps.fHasDlgVideoSource = 0 Then mnuSource.Enabled = False
'        If Caps.fHasDlgVideoFormat = 0 Then mnuFormat.Enabled = False
'        If Caps.fHasDlgVideoDisplay = 0 Then mnuDisplay.Enabled = False
        
        '// Turn Scale on
        capPreviewScale lwndC, True
            
        '// Set the preview rate in milliseconds
        capPreviewRate lwndC, 66
        
        '// Start previewing the image from the camera
        capPreview lwndC, True
            
        '// Resize the capture window to show the whole image
        ResizeCaptureWindow lwndC
        
        Connect = True
    Else
        Connect = False
    End If
 
End Function