《自动测试系统》课程课件.ppt

Eg2.波形清除按钮处理函数代码intCVICALLBACKClearWaveProc(intpanel,intcontrol,intevent,void*callbackData,inteventData1,inteventData2){ inti; if(event==EVENT_COMMIT) { SetCtrlAttribute(PANEL,PANEL_GRAPH,ATTR_REFRESH_GRAPH,0); //将绘图空间设置为刷新方式 DeleteGraphPlot(PANEL,PANEL_GRAPH,-1,VAL_DELAYED_DRAW); //清屏 i=RefreshGraph(PANEL,PANEL_GRAPH);//更新绘图控件并显示 } return0;}3.并发程序设计——定时器怎样才能实现波形的动态更新呢？简单的方法就是通过定时器，通过设定时间间隔，定时完成波形的刷新。在程序面板中添加定时器，设定定时器的时间间隔，并设置定时器时间到时的回调函数，在回调函数中添加需要定时完成的工作，就能实现程序的并发执行。Eg3.开始和停止按钮操作的实现SetCtrlAttribute(hpanel,PANEL_TIMER,ATTR_ENABLED,1);//使能定时器 SetCtrlAttribute(hpanel,PANEL_TIMER,ATTR_ENABLED,0);//使定时器无效Eg3.定时器回调函数代码intCVICALLBACKTimerProc(intpanel,intcontrol,intevent,void*callbackData,inteventData1,inteventData2){ …… switch(event) { caseEVENT_TIMER_TICK: SetCtrlAttribute(PANEL,PANEL_GRAPH,ATTR_REFRESH_GRAPH,0); DeleteGraphPlot(PANEL,PANEL_GRAPH,-1,VAL_DELAYED_DRAW); for(i=0;iDISPDATALEN;i++) { PlotPoint(PANEL,PANEL_GRAPH,XData[i],YData[i],VAL_SMALL_SOLID_SQUARE,VAL_RED); } i=RefreshGraph(PANEL,PANEL_GRAPH); break;}} 4.多线程程序定时器的缺点多线程的特点线程的设置UI线程工作线程该用例线程设置用户线程波形刷新线程4.多线程程序Eg4.线程的创建HANDLEthreadwaveHandle;DWORDWINAPIThreadWaveProc(PVOIDpParam);intmain(intargc,char*argv[]){…… if((hpanel=LoadPanel(0,gui.uir,PANEL))0)return-1; threadwaveHandle=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)ThreadWaveProc,ptr,0,id);/*创建接收数据线程 */DisplayPanel(hpanel); InstallMainCallback(MainCallback,0,1); RunUserInterface();DiscardPanel(hpanel); return0;}Eg4.线程处理函数DWORDWINAPIThreadWaveProc(PVOIDpParam){……while(1){ SetCtrlAttribute(PANEL,PANEL_GRAPH,ATTR_REFRESH_GRAPH,0); DeleteGraphPlot(PANEL,PANEL_GRAPH,-1,VAL_DELAYED_DRAW); for(i=0;iDISPDATALEN;i++) { PlotPoint(PANEL,PANEL_GRAPH,XData[i],YData[i],VAL_SMALL_SOLID_SQUARE,VA