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发表于 2023-2-4 21:10
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这是一段由AI自动生成的VBA高端应用:VBA实现人脸识别
- 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 capGetDriverDescriptionA Lib "avicap32.dll" (ByVal wDriver As Short, _
- ByVal lpszName As String, ByVal cbName As Integer, ByVal lpszVer As String, _
- ByVal cbVer As Integer) As Boolean
- Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, _
- ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
- Private Const WM_CAP_DRIVER_CONNECT = &H40A
- Private Const WM_CAP_DRIVER_DISCONNECT = &H40B
- Private Const WM_CAP_SET_PREVIEW = &H432
- Private Const WM_CAP_SET_PREVIEWRATE = &H434
- Private Const WM_CAP_SET_SCALE = &H432
- Private Const WM_CAP_START = &H400
- Dim hCap As Long
- Sub StartPreview()
- hCap = capCreateCaptureWindow("", WS_VISIBLE Or WS_CHILD, 0, 0, 640, 480, Me.hwnd, 0)
- If SendMessage(hCap, WM_CAP_DRIVER_CONNECT, 0, 0) Then
- SendMessage hCap, WM_CAP_SET_SCALE, True, 0
- SendMessage hCap, WM_CAP_SET_PREVIEWRATE, 66, 0
- SendMessage hCap, WM_CAP_SET_PREVIEW, True, 0
- SendMessage hCap, WM_CAP_START, 0, 0
- End If
- End Sub
- Sub StopPreview()
- If hCap Then
- SendMessage hCap, WM_CAP_DRIVER_DISCONNECT, 0, 0
- End If
- End Sub
复制代码
使用该代码可以在VBA窗口中实现摄像头预览功能,但并不支持获取摄像头捕获的图像数据。如果需要处理图像,可以使用其他技术,如DirectX或OpenCV等,获取摄像头数据并进行处理。
以下是使用OpenCV实现的代码示例:
- Sub StartPreviewWithOpenCV()
- Dim cap As New cv2.VideoCapture(0) ' 0表示第一个摄像头
- If Not cap.IsOpened() Then
- MsgBox "摄像头未打开!"
- Exit Sub
- End If
- Dim frame As cv2.Mat
- Do
- cap.Read(frame)
- If Not frame.Empty() Then
- ' 处理图像
- ' ...
- End If
- Loop Until frame.Empty()
- cap.Release()
- End Sub
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这是一个使用OpenCV库读取摄像头数据并处理图像的简单示例。需要注意的是,需要在VBA中使用OpenCV需要先安装OpenCV的COM组件并在VBA中导入相关类型库。 |
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