"VB实现打开摄像头功能的详细方法"
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0x40000000
Private Const WS_VISIBLE = &H10000000
Private Declare Function capCreateCaptureWindowA Lib "avicap32.dll" _
(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 capGetDriverDescriptionA Lib "avicap32.dll" _
(ByVal wDriver As Integer, _
ByVal lpszName As String, _
ByVal cbName As Integer, _
ByVal lpszVer As String, _
ByVal cbVer As Integer) As Boolean
Private mWidth As Long
Private mHeight As Long
Private hWnd As Long
Private Sub Form_Load()
Dim iHeight As Integer
Dim iWidth As Integer
iHeight = ScaleHeight
iWidth = ScaleWidth
hWnd = capCreateCaptureWindowA("WebCam", WS_CHILD Or WS_VISIBLE, 0, 0, mWidth, mHeight, Picture1.hWnd, 0)
If hWnd Then
SendMessage hWnd, WM_CAP_DRIVER_CONNECT, 0, 0
SendMessage hWnd, WM_CAP_SET_SCALE, True, 0
SendMessage hWnd, WM_CAP_SET_PREVIEWRATE, 66, 0
SendMessage hWnd, WM_CAP_SET_PREVIEW, True, 0
SetWindowPos hWnd, HWND_BOTTOM, 0, 0, Picture1.ScaleWidth, Picture1.ScaleHeight, SWP_NOMOVE Or SWP_NOZORDER
Else
MsgBox "Error"
End If
End Sub
Private Sub Form_Unload(Cancel As Integer)
SendMessage hWnd, WM_CAP_DRIVER_DISCONNECT, 0, 0
End Sub
Private Sub cmdCapture_Click()
Dim s As String
s = InputBox$("Enter Image Name:", "Capture", "img")
SavePicture Picture1.Image, App.Path & "\" & s & ".bmp"
End Sub
Private Sub cmdClose_Click()
Unload Me
End Sub
```
这段VB代码实现了打开摄像头的功能。首先,通过调用`capCreateCaptureWindowA`函数创建了一个摄像窗口,并将其显示在界面上。然后设置了摄像头的一些属性,比如连接摄像头设备、设置预览比例和频率等。接着通过`SendMessage`函数发送消息给窗口,实现了预览功能。此外,还实现了捕获图像和关闭摄像头的功能。通过这段代码,可以方便地在VB环境下实现摄像头的操作。
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