c# 调用摄像头抓图
Code1 Imports System
2 Imports System.Runtime.InteropServices
3 Imports System.Drawing
4 Imports System.Drawing.Imaging
5
6 Public Class CamClass Cam
7
8 Private Const WM_USER As Integer = &H400
9 Private Const WS_CHILD As Integer = &H40000000
10 Private Const WS_VISIBLE As Integer = &H10000000
11 Private Const WM_CAP_START As Integer = WM_USER
12 Private Const WM_CAP_STOP As Integer = WM_CAP_START + 68
13 Private Const WM_CAP_DRIVER_CONNECT As Integer = WM_CAP_START + 10
14 Private Const WM_CAP_DRIVER_DISCONNECT As Integer = WM_CAP_START + 11
15 Private Const WM_CAP_SAVEDIB As Integer = WM_CAP_START + 25
16 Private Const WM_CAP_GRAB_FRAME As Integer = WM_CAP_START + 60
17 Private Const WM_CAP_SEQUENCE As Integer = WM_CAP_START + 62
18 Private Const WM_CAP_FILE_SET_CAPTURE_FILEA As Integer = WM_CAP_START + 20
19 Private Const WM_CAP_SEQUENCE_NOFILE As Integer = WM_CAP_START + 63
20 Private Const WM_CAP_SET_OVERLAY As Integer = WM_CAP_START + 51
21 Private Const WM_CAP_SET_PREVIEW As Integer = WM_CAP_START + 50
22 Private Const WM_CAP_SET_CALLBACK_VIDEOSTREAM As Integer = WM_CAP_START + 6
23 Private Const WM_CAP_SET_CALLBACK_ERROR As Integer = WM_CAP_START + 2
24 Private Const WM_CAP_SET_CALLBACK_STATUSA As Integer = WM_CAP_START + 3
25 Private Const WM_CAP_SET_CALLBACK_FRAME As Integer = WM_CAP_START + 5
26 Private Const WM_CAP_SET_SCALE As Integer = WM_CAP_START + 53
27 Private Const WM_CAP_SET_PREVIEWRATE As Integer = WM_CAP_START + 52
28
29 Public Const WM_CAP_GET_CAPSTREAMPTR = WM_CAP_START + 1
30
31 Public Const WM_CAP_SET_CALLBACK_STATUS = WM_CAP_START + 3
32 Public Const WM_CAP_SET_CALLBACK_YIELD = WM_CAP_START + 4
33 Public Const WM_CAP_SET_CALLBACK_WAVESTREAM = WM_CAP_START + 7
34 Public Const WM_CAP_GET_USER_DATA = WM_CAP_START + 8
35 Public Const WM_CAP_SET_USER_DATA = WM_CAP_START + 9
36
37 Public Const WM_CAP_DRIVER_GET_NAME = WM_CAP_START + 12
38 Public Const WM_CAP_DRIVER_GET_VERSION = WM_CAP_START + 13
39 Public Const WM_CAP_DRIVER_GET_CAPS = WM_CAP_START + 14
40
41 Public Const WM_CAP_FILE_SET_CAPTURE_FILE = WM_CAP_START + 20
42 Public Const WM_CAP_FILE_GET_CAPTURE_FILE = WM_CAP_START + 21
43 Public Const WM_CAP_FILE_ALLOCATE = WM_CAP_START + 22
44 Public Const WM_CAP_FILE_SAVEAS = WM_CAP_START + 23
45 Public Const WM_CAP_FILE_SET_INFOCHUNK = WM_CAP_START + 24
46 Public Const WM_CAP_FILE_SAVEDIB = WM_CAP_START + 25
47
48 Public Const WM_CAP_EDIT_COPY = WM_CAP_START + 30
49
50 Public Const WM_CAP_SET_AUDIOFORMAT = WM_CAP_START + 35
51 Public Const WM_CAP_GET_AUDIOFORMAT = WM_CAP_START + 36
52
53 Public Const WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41
54 Public Const WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42
55 Public Const WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43
56 Public Const WM_CAP_GET_VIDEOFORMAT = WM_CAP_START + 44
57 Public Const WM_CAP_SET_VIDEOFORMAT = WM_CAP_START + 45
58 Public Const WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + 46
59
60 Public Const WM_CAP_GET_STATUS = WM_CAP_START + 54
61 Public Const WM_CAP_SET_SCROLL = WM_CAP_START + 55
62
63 Public Const WM_CAP_GRAB_FRAME_NOSTOP = WM_CAP_START + 61
64
65 Public Const WM_CAP_SET_SEQUENCE_SETUP = WM_CAP_START + 64
66 Public Const WM_CAP_GET_SEQUENCE_SETUP = WM_CAP_START + 65
67 Public Const WM_CAP_SET_MCI_DEVICE = WM_CAP_START + 66
68 Public Const WM_CAP_GET_MCI_DEVICE = WM_CAP_START + 67
69 Public Const WM_CAP_ABORT = WM_CAP_START + 69
70
71 Public Const WM_CAP_SINGLE_FRAME_OPEN = WM_CAP_START + 70
72 Public Const WM_CAP_SINGLE_FRAME_CLOSE = WM_CAP_START + 71
73 Public Const WM_CAP_SINGLE_FRAME = WM_CAP_START + 72
74
75 Public Const WM_CAP_PAL_OPEN = WM_CAP_START + 80
76 Public Const WM_CAP_PAL_SAVE = WM_CAP_START + 81
77 Public Const WM_CAP_PAL_PASTE = WM_CAP_START + 82
78 Public Const WM_CAP_PAL_AUTOCREATE = WM_CAP_START + 83
79 Public Const WM_CAP_PAL_MANUALCREATE = WM_CAP_START + 84
80
81 '// Following added post VFW 1.1
82 Public Const WM_CAP_SET_CALLBACK_CAPCONTROL = WM_CAP_START + 85
83
84 '// Defines end of the message range
85 Public Const WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL
86
87 Private hWndC As IntPtr
88 Private bStat As Boolean = False
89
90 Private mControlPtr As IntPtr
91 Private mWidth As Integer
92 Private mHeight As Integer
93 Private mLeft As Integer
94 Private mTop As Integer
95
96 <DllImport("avicap32.dll")> _
97 Private Shared Function capCreateCaptureWindowA()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
98 End Function
99
100 <DllImport("avicap32.dll")> _
101 Private Shared Function capGetVideoFormat()Function capGetVideoFormat(ByVal hWnd As IntPtr, ByVal psVideoFormat As IntPtr, ByVal wSize As Integer) As Integer
102 End Function
103
104 <DllImport("User32.dll")> _
105 Private Shared Function SendMessage()Function SendMessage(ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Long) As Boolean
106 End Function
107
108 Function capDlgVideoFormat()Function capDlgVideoFormat() As Boolean
109 capDlgVideoFormat = SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0)
110 End Function
111 Function capDlgVideoSource()Function capDlgVideoSource() As Boolean
112 capDlgVideoSource = SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0)
113 End Function
114 Function capDlgVideoDisplay()Function capDlgVideoDisplay() As Boolean
115 capDlgVideoDisplay = SendMessage(hWndC, WM_CAP_DLG_VIDEODISPLAY, 0, 0)
116 End Function
117 Function capDlgVideoCompression()Function capDlgVideoCompression() As Boolean
118 capDlgVideoCompression = SendMessage(hWndC, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0)
119 End Function
120
121 '接上节
122
123 '/// <summary>
124 '/// 初始化摄像头
125 '/// </summary>
126 '/// <param name="handle">控件的句柄</param>
127 '/// <param name="left">开始显示的左边距</param>
128 '/// <param name="top">开始显示的上边距</param>
129 '/// <param name="width">要显示的宽度</param>
130 '/// <param name="height">要显示的长度</param>
131 Public Sub New()Sub New(ByVal handle As IntPtr, ByVal left As Integer, ByVal top As Integer, ByVal width As Integer, ByVal height As Integer)
132 mControlPtr = handle
133 mWidth = width
134 mHeight = height
135 mLeft = left
136 mTop = top
137 End Sub
138
139 '/// <summary>
140 '/// 开始显示图像
141 '/// </summary>
142 Public Sub Start()Sub Start()
143 If bStat Then
144 Return
145 End If
146 bStat = True
147 Dim lpszName(99) As Byte
148
149 hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD Or WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0)
150
151 If hWndC.ToInt32() <> 0 Then
152 SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0)
153 SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0)
154 SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0)
155 SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0)
156 SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0)
157 SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0)
158 SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0)
159 SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0)
160 End If
161
162 Return
163 End Sub
164
165 '/// <summary>
166 '/// 停止显示
167 '/// </summary>
168 Public Sub [()Sub [Stop]()
169 SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0)
170 bStat = False
171 End Sub
172
173 '/// <summary>
174 '/// 抓图
175 '/// </summary>
176 '/// <param name="path">要保存bmp文件的路径</param>
177 Public Sub GrabImage()Sub GrabImage(ByVal path As String)
178 Dim hBmp As IntPtr = Marshal.StringToHGlobalAnsi(path)
179 SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64())
180 End Sub
181
182 '/// <summary>
183 '/// 录像
184 '/// </summary>
185 '/// <param name="path">要保存avi文件的路径</param>
186 Public Sub Kinescope()Sub Kinescope(ByVal path As String)
187 Dim hBmp As IntPtr = Marshal.StringToHGlobalAnsi(path)
188 SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64())
189 SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0)
190 End Sub
191
192 '/// <summary>
193 '/// 停止录像
194 '/// </summary>
195 Public Sub StopKinescope()Sub StopKinescope()
196 SendMessage(hWndC, WM_CAP_STOP, 0, 0)
197 End Sub
198 End Class
199
200 下面这个是测试窗体Form1.vb:
201
202 Public Class Form1Class Form1
203 Inherits System.Windows.Forms.Form
204
205 Private cccap As Cam
206 Windows 窗体设计器生成的代码#Region " Windows 窗体设计器生成的代码 "
207
208 Public Sub New()Sub New()
209 MyBase.New()
210
211 '该调用是 Windows 窗体设计器所必需的。
212 InitializeComponent()
213
214 '在 InitializeComponent() 调用之后添加任何初始化
215
216 End Sub
217
218 '窗体重写 dispose 以清理组件列表。
219 Protected Overloads Overrides Sub Dispose()Sub Dispose(ByVal disposing As Boolean)
220 If disposing Then
221 If Not (components Is Nothing) Then
222 components.Dispose()
223 End If
224 End If
225 MyBase.Dispose(disposing)
226 End Sub
227
228 'Windows 窗体设计器所必需的
229 Private components As System.ComponentModel.IContainer
230
231 '注意: 以下过程是 Windows 窗体设计器所必需的
232 '可以使用 Windows 窗体设计器修改此过程。
233 '不要使用代码编辑器修改它。
234 Friend WithEvents Button1 As System.Windows.Forms.Button
235 Friend WithEvents picView As System.Windows.Forms.PictureBox
236 Friend WithEvents Button2 As System.Windows.Forms.Button
237 Friend WithEvents Button3 As System.Windows.Forms.Button
238 Friend WithEvents Button4 As System.Windows.Forms.Button
239 Friend WithEvents Button5 As System.Windows.Forms.Button
240 <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()Sub InitializeComponent()
241 Me.picView = New System.Windows.Forms.PictureBox
242 Me.Button1 = New System.Windows.Forms.Button
243 Me.Button2 = New System.Windows.Forms.Button
244 Me.Button3 = New System.Windows.Forms.Button
245 Me.Button4 = New System.Windows.Forms.Button
246 Me.Button5 = New System.Windows.Forms.Button
247 Me.SuspendLayout()
248 '
249 'picView
250 '
251 Me.picView.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
252 Or System.Windows.Forms.AnchorStyles.Left) _
253 Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
254 Me.picView.Location = New System.Drawing.Point(16, 16)
255 Me.picView.Name = "picView"
256 Me.picView.Size = New System.Drawing.Size(640, 480)
257 Me.picView.TabIndex = 0
258 Me.picView.TabStop = False
259 '
260 'Button1
261 '
262 Me.Button1.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left), System.Windows.Forms.AnchorStyles)
263 Me.Button1.Location = New System.Drawing.Point(244, 540)
264 Me.Button1.Name = "Button1"
265 Me.Button1.Size = New System.Drawing.Size(56, 24)
266 Me.Button1.TabIndex = 1
267 Me.Button1.Text = "start"
268 '
269 'Button2
270 '
271 Me.Button2.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left), System.Windows.Forms.AnchorStyles)
272 Me.Button2.Location = New System.Drawing.Point(304, 540)
273 Me.Button2.Name = "Button2"
274 Me.Button2.Size = New System.Drawing.Size(56, 24)
275 Me.Button2.TabIndex = 1
276 Me.Button2.Text = "stop"
277 '
278 'Button3
279 '
280 Me.Button3.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left), System.Windows.Forms.AnchorStyles)
281 Me.Button3.Location = New System.Drawing.Point(380, 540)
282 Me.Button3.Name = "Button3"
283 Me.Button3.Size = New System.Drawing.Size(56, 24)
284 Me.Button3.TabIndex = 1
285 Me.Button3.Text = "cap"
286 '
287 'Button4
288 '
289 Me.Button4.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left), System.Windows.Forms.AnchorStyles)
290 Me.Button4.Location = New System.Drawing.Point(352, 508)
291 Me.Button4.Name = "Button4"
292 Me.Button4.Size = New System.Drawing.Size(124, 24)
293 Me.Button4.TabIndex = 1
294 Me.Button4.Text = "色彩校正"
295 '
296 'Button5
297 '
298 Me.Button5.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left), System.Windows.Forms.AnchorStyles)
299 Me.Button5.Location = New System.Drawing.Point(164, 512)
300 Me.Button5.Name = "Button5"
301 Me.Button5.Size = New System.Drawing.Size(124, 24)
302 Me.Button5.TabIndex = 1
303 Me.Button5.Text = "画面大小"
304 '
305 'Form1
306 '
307 Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
308 Me.ClientSize = New System.Drawing.Size(792, 573)
309 Me.Controls.Add(Me.Button1)
310 Me.Controls.Add(Me.picView)
311 Me.Controls.Add(Me.Button2)
312 Me.Controls.Add(Me.Button3)
313 Me.Controls.Add(Me.Button4)
314 Me.Controls.Add(Me.Button5)
315 Me.Name = "Form1"
316 Me.Text = "Form1"
317 Me.ResumeLayout(False)
318
319 End Sub
320
321 #End Region
322
323 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
324 cccap = New Cam(picView.Handle, 0, 0, picView.Width, picView.Height)
325 End Sub
326
327 Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
328 cccap.Start()
329 End Sub
330
331 Private Sub Button2_Click()Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
332 cccap.Stop()
333 End Sub
334
335 Private Sub Button3_Click()Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
336 cccap.GrabImage("c:\test.bmp")
337 End Sub
338
339 Private Sub Form1_Closed()Sub Form1_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed
340 cccap = Nothing
341 End Sub
342
343 Private Sub Button4_Click()Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
344 cccap.capDlgVideoSource()
345 End Sub
346
347 Private Sub Button5_Click()Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
348 cccap.capDlgVideoFormat()
349 End Sub
350 End Class
351
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