基于LabWindowsCVI的摄像头控制技术--实现屏幕截图、录像功能.doc

基于LabWindows/CVI的摄像头控制技术实现屏幕截图、录像功能(2006-11-20 16:54:28) 转载分类： LabWindow/CVI技术文章 我们都知道，LabWindows/CVI的强大功能实际上不只是在测控领域，在其它方面，也显示着无与伦比的优势。你的电脑有没有摄像头？看到别人用QQ玩视屏你会不会去想怎么实现的？ 一般来说，所有的摄像头都会包括一个AVICAP32.DLL动态链接库文件，而动态库里面必有capCreateCaptureWindow和capCreateCaptureWindowA这两个函数，我们就是利用这些函数实现图像采集的！这里介绍使用AVICAP32.DLL就可轻松的实现对摄像头编程，如果再加上你的网络编程水平，实现一个视屏聊天就不成什么问题了。如果电脑没有摄像头，但又想看看程序的效果，可以么？呵呵，当然可以，找个虚拟摄像头就可以搞定了，大家可以试试“SoftCam”这个软件，它是一个名副其实的软件摄像机，能模拟成为“真实的”摄像机，提醒一下各位，大家可不要用这个东东用在QQ，MSN等聊天软件上欺骗MM或GG啊。本例能实现图片的保存，浏览以及录像功能，在界面上都能显示出来，大家仔细瞧瞧吧！界面如下：图中的景像就是我的实验室，情况有点糟糕，哈哈，还能凑合着过！代码如下：#include windows.h#include avicap32.h#include#include#include cam.h/设置所需要摄像头的常量#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_COPYDIBWM_CAP_START + 30 /复制图片/定义面板句柄static int handle;/定义摄像头句柄static int result;static int panelHandle;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)SendMessage(HWND)result,WM_CAP_SAVEDIB,0,(LPARAM)path);/获得BMP位图IDGetBitmapFromFile (path, &bitmapID);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; /删除BMP位图IDDiscardBitmap (bitmapID);/循环累加，共三次，三次之后回零i+;if (i = 3)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 pathMAX_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)