vb vfw 视频捕捉步骤

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本文介绍使用AVICAP API进行摄像头编程的方法，包括调用函数创建预览窗口、连接驱动及配置摄像头参数等步骤。

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Private Declare Function capGetDriverDescription Lib "avicap32.dll" Alias "capGetDriverDescriptionA" (ByVal wDriverIndex As Long, ByVal lpszName As String, ByVal cbName As Long, ByVal lpszVer As String, ByVal cbVer As Long) As Long

Private Declare Function capCreateCaptureWindow Lib "avicap32.dll" Alias "capCreateCaptureWindowA" (ByVal lpszWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal nID As Long) As Long

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Private Const WS_CHILD = &H40000000

Private Const WS_THICKFRAME = &H40000

Private Const WS_VISIBLE = &H10000000

Private Const WS_CAPTION = &HC00000

Private Const WM_USER = &H400

Private Const WM_CAP_START = WM_USER

Private Const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10

Private Const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11

Private Const WM_CAP_SET_PREVIEW = WM_CAP_START + 50

Private Const WM_CAP_SET_OVERLAY = WM_CAP_START + 51

Private Const WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52

Private Const WM_CAP_SET_SCALE = WM_CAP_START + 53

lwnd 为摄像头句柄

1,获取所有驱动 capGetDriverDescription

2,创建窗口 capCreateCaptureWindow

3,连接驱动 SendMessage(lwnd,WM_CAP_DRIVER_CONNECT,0, 0)

4,设置是否自动适应 SendMessage(lwnd, WM_CAP_SET_SCALE,true,0)

5,设置速率 SendMessage(lwnd, WM_CAP_SET_PREVIEWRATE,66, 0)

6,开始预览 SendMessage(lwnd, WM_CAP_SET_PREVIEW,true, 0)

8,停止连接 SendMessage(lwnd,WM_CAP_DRIVER_DISCONNECT, 0, 0)

Dim hwndDlg As Long

Private Sub Command1_Click()
    '开始
    Dim strName As String * 100
    Dim strVersion As String * 100
    Dim j As Long
    Call capGetDriverDescription(0, strName, 100, strVersion, 100)

    hwndDlg = capCreateCaptureWindow(strName, WS_CHILD Or WS_THICKFRAME Or WS_VISIBLE, 0, 0, 320, 240, Picture1.hwnd, 0)

    j = SendMessage(hwndDlg, WM_CAP_DRIVER_CONNECT, 0, 0)

    Dim bTrue As Boolean
    bTrue = True
    j = SendMessage(hwndDlg, WM_CAP_SET_SCALE, bTrue, 0)

    j = SendMessage(hwndDlg, WM_CAP_SET_PREVIEWRATE, 60, 0)

    j = SendMessage(hwndDlg, WM_CAP_SET_PREVIEW, bTrue, 0)


End Sub

Private Sub Command2_Click()
    '停止
    If hwndDlg > 0 Then
      Dim j As Long
      j = SendMessage(hwndDlg, WM_CAP_DRIVER_DISCONNECT, 0, 0)
    End If
End Sub

Private Sub Command3_Click()
'退出
End Sub