原创 Labwindows/cvi8.5学习日志(43)----摄像头控制技术-实现屏幕截图、录像功能

原帖地址: http://blog.sina.com.cn/s/blog_4b677075010006da.html   表示感谢!

//*****************************************************************************
// Labwindows/cvi8.5  摄像头控制技术-实现屏幕截图、录像功能
// szlihongtao
// 2010-08-03
//***************************************************************************** 
#include "windows.h"
#include "avicap32.h"
#include <cvirte.h>       
#include <userint.h>
#include "cam.h"
//*****************************************************************************
// 设置所需要摄像头的常量
// WM_USER 这个常量在 winuser.h 这个文件中定义
// #define WM_USER    0x0400 
//*****************************************************************************
#define WM_CAP_START          WM_USER       //开始
#define WM_CAP_STOP          WM_CAP_START + 68   //停止
#define WM_CAP_DRIVER_CONNECT  WM_CAP_START + 10   //连接
#define WM_CAP_DRIVER_DISCONNECT WM_CAP_START + 11  //断开
#define WM_CAP_SAVEDIB         WM_CAP_START + 25
#define WM_CAP_GRAB_FRAME       WM_CAP_START + 60
#define WM_CAP_SEQUENCE         WM_CAP_START + 62
#define WM_CAP_FILE_SET_CAPTURE_FILEA    WM_CAP_START + 20 //保存至文件
//#define WM_CAP_SEQUENCE_NOFILE WM_CAP_START + 63
#define WM_CAP_SET_OVERLAY      WM_CAP_START + 51
#define WM_CAP_SET_PREVIEW      WM_CAP_START + 50
#define WM_CAP_SET_CALLBACK_VIDEOSTREAM WM_CAP_START +6
#define WM_CAP_SET_CALLBACK_ERROR      WM_CAP_START +2
#define WM_CAP_SET_CALLBACK_STATUSA     WM_CAP_START +3
//#define WM_CAP_SET_CALLBACK_FRAME     WM_CAP_START +5
#define WM_CAP_SET_SCALE         WM_CAP_START+  53
#define WM_CAP_SET_PREVIEWRATE       WM_CAP_START+  52
#define WM_CAP_COPYDIB         WM_CAP_START + 30  //复制图片
//*****************************************************************************  
static int handle_win;     //定义面板句柄        
static int panelHandle;
static int result;    //定义摄像头句柄    
//*****************************************************************************
// 主程序
//*****************************************************************************
int main (int argc, char *argv[])
{
 if (InitCVIRTE (0, argv, 0) == 0)
  return -1; /* out of memory */
 if ((panelHandle = LoadPanel (0, "cam.uir", PANEL)) < 0)
  return -1;
 DisplayPanel (panelHandle);
 RunUserInterface ();
 DiscardPanel (panelHandle);
 return 0;
}
//*****************************************************************************
//退出按钮
//*****************************************************************************
int CVICALLBACK QuitCallback (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
   QuitUserInterface (0);
  break;
 }
 return 0;
}
//*****************************************************************************
//开始按钮
//*****************************************************************************
int CVICALLBACK startCB (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 int width;
 int height;
 int top;
 int left;
 switch (event)
 {
  case EVENT_COMMIT:
  {
    /*
     handle_win   
     获得面板句柄,供操作系统windows使用 
       A number that can be cast to obtain the system-specific window handle for a top-level panel.
     The actual type of the value is HWND.
     The value is zero for child panels.   
    */
    GetPanelAttribute (panelHandle, ATTR_SYSTEM_WINDOW_HANDLE, &handle_win);

    //获得屏幕中图像要显示的位置，即 PANEL_CANVAS_TV 的有关坐标参数
    GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_LEFT, &left);
    GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_TOP, &top);
    GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, &height); // 高度
    GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, &width); // 宽度
    
    //打开摄像头
    result = capCreateCaptureWindowA("我的视频监视窗口",WS_CHILD | WS_VISIBLE ,left,top,width,height,handle_win,0);

    //设置摄像头函数
    SendMessage((HWND)result, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
    SendMessage((HWND)result, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
    SendMessage((HWND)result, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
    SendMessage((HWND)result, WM_CAP_DRIVER_CONNECT, 0, 0);
    SendMessage((HWND)result, WM_CAP_SET_SCALE, 1, 0);
    SendMessage((HWND)result, WM_CAP_SET_PREVIEWRATE, 66, 0);
    SendMessage((HWND)result, WM_CAP_SET_OVERLAY, 1, 0);
    SendMessage((HWND)result, WM_CAP_SET_PREVIEW, 1, 0);   
  }
  break;
 }
 return 0;
}
//*****************************************************************************
//停止按钮
//*****************************************************************************
int CVICALLBACK stopCB (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
   if (result != 0)
   {
    //断开连接
    SendMessage((HWND)result, WM_CAP_DRIVER_DISCONNECT, 0, 0);
   }
   break;
 }
 return 0;
}
//*****************************************************************************
//保存BMP按钮
//*****************************************************************************
int CVICALLBACK recordbmp (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 int bitmapID;   // int available; 定义BMP位图ID号   
 char path[MAX_PATHNAME_LEN];   //定义文件存储路径  
 static int i;      //定义静态变量，设置循环次数   
 
 switch (event)
 {
  case EVENT_COMMIT:
  {
   /* 此代码为将图片存入剪切板 
   if (result != 0)
   {
   SendMessage((HWND)result, WM_CAP_GRAB_FRAME, 0, 0);
   SendMessage((HWND)result, WM_CAP_COPYDIB, 0, 0);

   ClipboardGetBitmap (&bitmapID, &available);
   if (available ==1)
   {
   CanvasClear (panelHandle, PANEL_CANVAS, VAL_ENTIRE_OBJECT);
   CanvasDrawBitmap (panelHandle, PANEL_CANVAS, bitmapID, VAL_ENTIRE_OBJECT, VAL_ENTIRE_OBJECT);
   }
   DiscardBitmap (bitmapID);
   }
   */
   //保存位图
   if (FileSelectPopup ("", "*.bmp", "*.bmp", "保存", VAL_SAVE_BUTTON, 0, 0, 1, 1, path) > 0)
   {
    SendMessage((HWND)result,WM_CAP_SAVEDIB,0,(LPARAM)path);
                 
    GetBitmapFromFile (path, &bitmapID);    //获得BMP位图ID    
    switch (i)   //设置三个位图浏览器 
    {  
     case 0:
      CanvasDrawBitmap (panelHandle, PANEL_CANVAS_SNAP0, bitmapID, VAL_ENTIRE_OBJECT, VAL_ENTIRE_OBJECT);
     break;
     case 1:
      CanvasDrawBitmap (panelHandle, PANEL_CANVAS_SNAP1, bitmapID, VAL_ENTIRE_OBJECT, VAL_ENTIRE_OBJECT);
     break;
     case 2:
      CanvasDrawBitmap (panelHandle, PANEL_CANVAS_SNAP2, bitmapID, VAL_ENTIRE_OBJECT, VAL_ENTIRE_OBJECT);
     break;
    }
   
    DiscardBitmap (bitmapID);   //删除BMP位图ID
         
    if (++i == 3)    //循环累加，共三次，三次之后回零
     i = 0;
   }
   break;
  }
  }
  return 0;
}
//*****************************************************************************
//开始录像按钮
//*****************************************************************************
int CVICALLBACK recordstream (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 char path[MAX_PATHNAME_LEN]; 
 switch (event)
 {
 case EVENT_COMMIT:
 {
  //保存录像
  if (FileSelectPopup ("", "*.avi", "*.avi", "保存", VAL_SAVE_BUTTON, 0, 0, 1, 1, path) > 0)
  {
   SendMessage((HWND)result,WM_CAP_FILE_SET_CAPTURE_FILEA,0,(LPARAM)path);
   SendMessage((HWND)result, WM_CAP_SEQUENCE, 0, 0);
  }
  break;
 }
 }
 return 0;
}
//*****************************************************************************
//停止录像按钮
//*****************************************************************************
int CVICALLBACK stopstream (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
   SendMessage((HWND)result, WM_CAP_STOP, 0, 0);
  break;
 }
 return 0;
}
//*****************************************************************************
// 显示制式设置
// 即图片的分辨率
//*****************************************************************************
int CVICALLBACK method (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 int kind;
 int width;
 int height;
 int top;
 int left;
 
 switch (event)
 {
  case EVENT_COMMIT:   //获得制式种类
  {
   GetCtrlVal (panelHandle, PANEL_RING, &kind);
   
   switch (kind)
   {
    case 0:   //160*120制式 
     SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, 160);
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, 120);
      break;
    case 1:    //1176*144制式 
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, 176);
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, 144);
      break;
    case 2:     //320*240制式
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, 320);
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, 240);
      break;
    case 3:    //352*288制式
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, 352);
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, 288);
      break;
    case 4:   //1默认制式
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, 592);
      SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, 333);
      break;
   }
   //获得屏幕中图像要显示的位置
   GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_LEFT, &left);
   GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_TOP, &top);
   GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_HEIGHT, &height);
   GetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_WIDTH, &width);

   //重新定位
   SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_TOP, (333-height)/2+55);
   SetCtrlAttribute (panelHandle, PANEL_CANVAS_TV, ATTR_LEFT, (592-width)/2+53);
                     
   SendMessage((HWND)result, WM_CAP_DRIVER_DISCONNECT, 0, 0);    //断开连接 
   startCB(panel, PANEL_CANVAS_TV, EVENT_COMMIT, NULL, 0, 0);    //调用开始按钮事件          
   break;
  }
 }
 return 0;
}
/*
capCreateCaptureWindowA   
Declare capCreateCaptureWindow in "avicap32.dll" as "capCreateCaptureWindowA" ;

                                        String lpszWindowName,;  视频窗口的名字   
                                        Long dwStyle ,;       样式
                                        Long x ,;     左边距（相对于父窗口，一般为0）
                                        Long y ,;      上边距（相对于父窗口，一般为0）      
                                        Long nWidth,;       视频窗口的宽度（注：此项并不会改变摄像头的分辨率，超出部分不会被刷新）
                                        Long nHeight ,;       视频窗口的高度
                                        Long hwndParent,;      父窗口句柄  
                                        Long nID     标识符（一般为0）   

函数返回打开的句柄值。
这是VFW编程最基本的函数了,例如：
lwndC = capCreateCaptureWindowA("我的视频监视窗口", WS_CHILD , 0, 0, 160, 120, hwnd, 0)
---------------------------------------------------------------------------------------------------   */