1、using System;using System.Collections.Generic;using System.Comp onen tModel;using System.Data;using System.Drawing;using Syste m丄 i nq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;n amespaceWi ndowsFormsApplicatio n24public partial class Form1 : Formpublic Form1(

2、)In itializeComp onen t();const short WM_CAP =1024;const int WM_CAP_DRIVER_CONNECT = WM_CAP +const int WM_CAP_DRIVER_DISCONNECT = WM_CAP +const int WM_CAP_EDIT_COPY = WM_CA30+con st int WM_CAP_SET_PREVIEW = WM_C庖0; +const int WM_CAP_SET_PREVIEWRATE = WM_G5®P +const int WM_CAP_SET_SCALE = WM_CAJ

3、3;+con st int WS_CHILD = 1073741824const int WS_VISIBLE = 268435456con st short SWP_NOMOVE2=con st short SWP_NOSIZE =1;const short SWP_NOZORDEF4=const short HWND_BOTTOM1 =int iDevice =0;int hHwnd;System.Runtime.InteropServices.Dlllmport("user32" , EntryPoi nt 二"Se ndMessageA"stat

4、ic extern int SendMessage(int hwnd, int wMsg, int wParam, MarshalAs(U nman agedType.AsA ny)object lParam);System.Runtime.InteropServices.Dlllmport("user32" , EntryPoi nt 二"SetWi ndowPos")static extern int SetWindowPos( int hwnd, int hWndlnsertAfter, int x, int y, int cx, int cy,

5、int wFlags);System.Runtime.lnteropServices.Dlllmport("user32")static extern bool DestroyWindow( int hndw);System.R un time.I nteropServices.Dlllmport("avicap32.dll")static extern int capCreateCaptureWindowA( string lpszWi ndowName,int dwStyle, int x, int y, int nWidth, short nHei

6、ght, int hWndParent, int nID);System.R un time.I nteropServices.Dlllmport("avicap32.dll")static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);private void OpenPreviewWindow()int iHeight =320;int iWidth =200;/ Ope n Preview wi nd

7、ow in picturebox/hHw nd = capCreateCaptureWi ndowA(iDevice.ToStri ng(),n t32(),0);/ Connect to device/if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) = 1)/ Set the preview scale/SendMessage(hHwnd, WM_CAP_SET_SCALE,1, 0);/ Set the preview rate in milliseco nds/Sen dMessage(hHw nd, WM_CAP_SE

8、T_PREVIEWRATE,66,0);/ Start preview ing the image from the camera/SendMessage(hHwnd, WM_CAP_SET_PREVIEW,1, 0);/ Resize win dow to fit in picturebox/0, 0, iWidth,SetWi ndowPos(hHw nd, HWND_BOTTOM,iHeight, (SWP_NOMOVE | SWP_NOZORDER);else/ Error connecting to device close wi ndow/DestroyWi ndow(hHw nd

9、);private void ClosePreviewWindow()/ Disc onn ect from device/Sen dMessage(hHw nd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);/ close win dow/DestroyWi ndow(hHw nd);private void butt on 1_Click( object sen der, Eve ntArgs e)iDevice =int .Parse(device_number_textBox.Text);Ope nPreviewWi ndow();C# codeusin

10、g System;using System.Collections.Generic;using System.Comp onen tModel;using System.Data;using System.Drawing;using Syste m丄 i nq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;n amespaceWi ndowsFormsApplicatio n24public partial class Form1 : Formpublic Form1()In

11、itializeComp onen t();const short WM_CAP =1024;WM_CAP +=WM_CAP +const int WM_CAP_DRIVER_CONNECT =const int WM_CAP_DRIVER_DISCONNECT const int WM_CAP_EDIT_COPY = WM_CA30+con st int WM_CAP_SET_PREVIEW = WM_C庖0; + const int WM_CAP_SET_PREVIEWRATE = WM_C2P + const int WM_CAP_SET_SCALE = WM_CAJ3;+con st

12、int WS_CHILD = 1073741824const int WS_VISIBLE = 268435456con st short SWP_NOMOVE2=con st short SWP_NOSIZE =1;const short SWP_NOZORDER4=const short HWND_BOTTOM1 =int iDevice =0;int hHwnd;System.Runtime.InteropServices.Dlllmport("user32" , EntryPoi nt ="Se ndMessageA"static extern

13、int SendMessage(int hwnd, int wMsg, int wParam, MarshalAs(U nman agedType.AsA ny)object lParam);System.Runtime.InteropServices.Dlllmport("user32" , EntryPoi nt ="SetWi ndowPos")static extern int SetWindowPos( int hwnd, int hWndlnsert After, int x, int y, int cx, int cy, int wFlag

14、s);System.Runtime.lnteropServices.Dlllmport("user32")static extern bool DestroyWindow( int hndw);System.R un time.I nteropServices.Dlllmport("avicap32.dll")static extern int capCreateCaptureWindowA( string lpszWi ndowName,int dwStyle, int x, int y, int nWidth, short nHeight, int

15、hWndParent, int nID);System.R un timenteropServices.Dlllmport("avicap32.dll")static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);private void OpenPreviewWindow()int iHeight =320;int iWidth =200;/ Ope n Preview wi ndow in pictur

16、ebox/hHw nd = capCreateCaptureWi ndowA(iDevice.ToStri ng(),n t32(),0);/ Connect to device/if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) = 1)/ Set the preview scale/SendMessage(hHwnd, WM_CAP_SET_SCALE,1, 0);/ Set the preview rate in milliseco nds/Sen dMessage(hHw nd, WM_CAP_SET_PREVIEWRAT

17、E,66,/ Start preview ing the image from the camera/SendMessage(hHwnd, WM_CAP_SET_PREVIEW,1, 0);/ Resize win dow to fit in picturebox/SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, iWidth,iHeight, (SWP_NOMOVE | SWP_NOZORDER);else/ Error connecting to device close wi ndow/DestroyWi ndow(hHw nd);private void ClosePreviewWindow()/ Disc onn ect from device/Sen dMessage(hHw nd, WM_CAP_DRIVER_DISCONNECT, iDevic e, 0);/ close win dow/DestroyWi ndow(hHw