WinForm Program Call Camera

The following code can be used directly!

usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.Runtime.InteropServices; Public classvideowork{Private Const intWm_user =0x400; Private Const intWs_child =0x40000000; Private Const intWs_visible =0x10000000; Private Const intWm_cap_start =Wm_user; Private Const intWm_cap_stop = Wm_cap_start + the; Private Const intWm_cap_driver_connect = Wm_cap_start +Ten; Private Const intWm_cap_driver_disconnect = Wm_cap_start + One; Private Const intWm_cap_savedib = Wm_cap_start + -; Private Const intWm_cap_grab_frame = Wm_cap_start + -; Private Const intWm_cap_sequence = Wm_cap_start + +; Private Const intWm_cap_file_set_capture_filea = Wm_cap_start + -; Private Const intWm_cap_sequence_nofile = Wm_cap_start + the; Private Const intWm_cap_set_overlay = Wm_cap_start +Wuyi; Private Const intWm_cap_set_preview = Wm_cap_start + -; Private Const intWm_cap_set_callback_videostream = Wm_cap_start +6; Private Const intWm_cap_set_callback_error = Wm_cap_start +2; Private Const intWm_cap_set_callback_statusa = Wm_cap_start +3; Private Const intWm_cap_set_callback_frame = Wm_cap_start +5; Private Const intWm_cap_set_scale = Wm_cap_start + -; Private Const intWm_cap_set_previewrate = Wm_cap_start + the; PrivateIntPtr HWNDC; Private BOOLBworkstart =false; PrivateIntPtr mcontrolptr; Private intMwidth; Private intMheight; Private intMleft; Private intMtop; /**/    ///   <summary>     ///initializing the display image///   </summary>     ///   <param name= "Handle" >handle to the control</param>     ///   <param name= "left" >left margin to start display</param>     ///   <param name= "Top" >top margin to start showing</param>     ///   <param name= "width" >the width to display</param>     ///   <param name= "height" >the length to display</param>      PublicVideowork (INTPTR handle,intLeftintTopintWidthintheight) {Mcontrolptr=handle; Mwidth=width; Mheight=height; Mleft=Left ; Mtop=top; } [DllImport ("Avicap32.dll")]    Private Static externIntPtr Capcreatecapturewindowa (byte[] lpszWindowName,intDwstyle,intXintYintNwidth,intNheight, IntPtr hwndparent,intNID); [DllImport ("Avicap32.dll")]    Private Static extern intCapgetvideoformat (IntPtr hWnd, IntPtr Psvideoformat,intwsize); //     //It is particularly important to note that because long in WINAPI is 32 bits and long in C # is 64wei, you need to lparam the int//[DllImport ("User32.dll")]    Private Static extern BOOLSendMessage (IntPtr hWnd,intWmsg,intWParam,intLParam); /**/    ///   <summary>     ///Start Display Image///   </summary>      Public voidStart () {if(Bworkstart)return; Bworkstart=true; byte[] LpszName =New byte[ -]; HWNDC= Capcreatecapturewindowa (LpszName, Ws_child | Ws_visible, Mleft, Mtop, Mwidth, Mheight, Mcontrolptr,0); if(Hwndc.toint32 ()! =0) {SendMessage (HWNDC, Wm_cap_set_callback_videostream,0,0); SendMessage (HWNDC, Wm_cap_set_callback_error,0,0); SendMessage (HWNDC, Wm_cap_set_callback_statusa,0,0); SendMessage (HWNDC, Wm_cap_driver_connect,0,0); SendMessage (HWNDC, Wm_cap_set_scale,1,0); SendMessage (HWNDC, Wm_cap_set_previewrate, the,0); SendMessage (HWNDC, Wm_cap_set_overlay,1,0); SendMessage (HWNDC, Wm_cap_set_preview,1,0); //Global.log.Write ("SendMessage");        }        return; }    /**/    ///   <summary>     ///Stop Display///   </summary>      Public voidStop () {SendMessage (HWNDC, Wm_cap_driver_disconnect,0,0); Bworkstart=false; }    /**/    ///   <summary>     ///Grab Map///   </summary>     ///   <param name= "path" >the path to save the BMP file</param>      Public voidGrabimage (stringpath) {INTPTR hbmp=marshal.stringtohglobalansi (path); SendMessage (HWNDC, Wm_cap_savedib,0, Hbmp.toint32 ()); }} Call Method: Drag a panel call code on the form: Videowork WV=NewVideowork (Panel1. Handle,0,0, Panel1. Width, Panel1. Height); WV. Start ();

The above code, can be implemented and uploaded, according to the need to call different methods!

WinForm Program Call Camera