vb.net摄像头拍照，，这些每一行都是什么意思？？？
Imports SystemImports System.Runtime.InteropServices
Imports System.Drawing
Imports System.Drawing.Imaging
Public Class Cam
Private Const WM_USER As Integer = &H400
Private Const WS_CHILD As Integer = &H40000000
Private Const WS_VISIBLE As Integer = &H10000000
Private Const WM_CAP_START As Integer = WM_USER
Private Const WM_CAP_STOP As Integer = WM_CAP_START + 68
Private Const WM_CAP_DRIVER_CONNECT As Integer = WM_CAP_START + 10
Private Const WM_CAP_DRIVER_DISCONNECT As Integer = WM_CAP_START + 11
Private Const WM_CAP_SAVEDIB As Integer = WM_CAP_START + 25
Private Const WM_CAP_GRAB_FRAME As Integer = WM_CAP_START + 60
Private Const WM_CAP_SEQUENCE As Integer = WM_CAP_START + 62
Private Const WM_CAP_FILE_SET_CAPTURE_FILEA As Integer = WM_CAP_START + 20
Private Const WM_CAP_SEQUENCE_NOFILE As Integer = WM_CAP_START + 63
Private Const WM_CAP_SET_OVERLAY As Integer = WM_CAP_START + 51
Private Const WM_CAP_SET_PREVIEW As Integer = WM_CAP_START + 50
Private Const WM_CAP_SET_CALLBACK_VIDEOSTREAM As Integer = WM_CAP_START + 6
Private Const WM_CAP_SET_CALLBACK_ERROR As Integer = WM_CAP_START + 2
Private Const WM_CAP_SET_CALLBACK_STATUSA As Integer = WM_CAP_START + 3
Private Const WM_CAP_SET_CALLBACK_FRAME As Integer = WM_CAP_START + 5
Private Const WM_CAP_SET_SCALE As Integer = WM_CAP_START + 53
Private Const WM_CAP_SET_PREVIEWRATE As Integer = WM_CAP_START + 52
Public Const WM_CAP_GET_CAPSTREAMPTR = WM_CAP_START + 1
Public Const WM_CAP_SET_CALLBACK_STATUS = WM_CAP_START + 3
Public Const WM_CAP_SET_CALLBACK_YIELD = WM_CAP_START + 4
Public Const WM_CAP_SET_CALLBACK_WAVESTREAM = WM_CAP_START + 7
Public Const WM_CAP_GET_USER_DATA = WM_CAP_START + 8
Public Const WM_CAP_SET_USER_DATA = WM_CAP_START + 9
Public Const WM_CAP_DRIVER_GET_NAME = WM_CAP_START + 12
Public Const WM_CAP_DRIVER_GET_VERSION = WM_CAP_START + 13
Public Const WM_CAP_DRIVER_GET_CAPS = WM_CAP_START + 14
Public Const WM_CAP_FILE_SET_CAPTURE_FILE = WM_CAP_START + 20
Public Const WM_CAP_FILE_GET_CAPTURE_FILE = WM_CAP_START + 21
Public Const WM_CAP_FILE_ALLOCATE = WM_CAP_START + 22
Public Const WM_CAP_FILE_SAVEAS = WM_CAP_START + 23
Public Const WM_CAP_FILE_SET_INFOCHUNK = WM_CAP_START + 24
Public Const WM_CAP_FILE_SAVEDIB = WM_CAP_START + 25
Public Const WM_CAP_EDIT_COPY = WM_CAP_START + 30
Public Const WM_CAP_SET_AUDIOFORMAT = WM_CAP_START + 35
Public Const WM_CAP_GET_AUDIOFORMAT = WM_CAP_START + 36
Public Const WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41
Public Const WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42
Public Const WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43
Public Const WM_CAP_GET_VIDEOFORMAT = WM_CAP_START + 44
Public Const WM_CAP_SET_VIDEOFORMAT = WM_CAP_START + 45
Public Const WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + 46
Public Const WM_CAP_GET_STATUS = WM_CAP_START + 54
Public Const WM_CAP_SET_SCROLL = WM_CAP_START + 55
Public Const WM_CAP_GRAB_FRAME_NOSTOP = WM_CAP_START + 61
Public Const WM_CAP_SET_SEQUENCE_SETUP = WM_CAP_START + 64
Public Const WM_CAP_GET_SEQUENCE_SETUP = WM_CAP_START + 65
Public Const WM_CAP_SET_MCI_DEVICE = WM_CAP_START + 66
Public Const WM_CAP_GET_MCI_DEVICE = WM_CAP_START + 67
Public Const WM_CAP_ABORT = WM_CAP_START + 69
Public Const WM_CAP_SINGLE_FRAME_OPEN = WM_CAP_START + 70
Public Const WM_CAP_SINGLE_FRAME_CLOSE = WM_CAP_START + 71
Public Const WM_CAP_SINGLE_FRAME = WM_CAP_START + 72
Public Const WM_CAP_PAL_OPEN = WM_CAP_START + 80
Public Const WM_CAP_PAL_SAVE = WM_CAP_START + 81
Public Const WM_CAP_PAL_PASTE = WM_CAP_START + 82
Public Const WM_CAP_PAL_AUTOCREATE = WM_CAP_START + 83
Public Const WM_CAP_PAL_MANUALCREATE = WM_CAP_START + 84
'// Following added post VFW 1.1
Public Const WM_CAP_SET_CALLBACK_CAPCONTROL = WM_CAP_START + 85
'// Defines end of the message range
Public Const WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL
Private hWndC As IntPtr
Private bStat As Boolean = False
Private mControlPtr As IntPtr
Private mWidth As Integer
Private mHeight As Integer
Private mLeft As Integer
Private mTop As Integer
<DllImport("avicap32.dll")> _
Private Shared Function capCreateCaptureWindowA(ByVal lpszWindowName() As Byte, ByVal dwStyle As Integer, ByVal x As Integer, ByVal y As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal hWndParent As IntPtr, ByVal nID As Integer) As IntPtr
End Function
<DllImport("avicap32.dll")> _
Private Shared Function capGetVideoFormat(ByVal hWnd As IntPtr, ByVal psVideoFormat As IntPtr, ByVal wSize As Integer) As Integer
End Function
<DllImport("User32.dll")> _
Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Long) As Boolean
End Function
Function capDlgVideoFormat() As Boolean
capDlgVideoFormat = SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0)
End Function
Function capDlgVideoSource() As Boolean
capDlgVideoSource = SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0)
End Function
Function capDlgVideoDisplay() As Boolean
capDlgVideoDisplay = SendMessage(hWndC, WM_CAP_DLG_VIDEODISPLAY, 0, 0)
End Function
Function capDlgVideoCompression() As Boolean
capDlgVideoCompression = SendMessage(hWndC, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0)
End Function --------------------编程问答-------------------- 自己顶！！！！！！！！！各位大虾帮帮忙啊！！！！！！！！！！！ --------------------编程问答-------------------- 定义几个常量和API而已 你查一下那个几API,一般就能顺带查到那些常量的含义了 --------------------编程问答-------------------- 我查不到，或是不懂得查，请你具体说说
补充：VB , API
