虚拟仪器设计与应用CVI复习资料.doc

要求： 设置电源开关键，电源打开，LED灯亮，系统开始工作；否则，系统不工作。若电源未开，直接点击“OK”键，系统弹出错误报警对话框。 当电源打开后，定时器开始工作，定时间隔为1s。每隔一秒，电表的示数增加一度。电表示数的范围是0-20。当示数增加到20度后，定时器关闭，电表停止不动，直至再次按下“OK”键重新计数。 “QUIT”按钮用于在任意时刻退出整个面板的工作。 #include cvirte.h #include userint.h #include sfeef.h static int panelHandle,t; double timer; int main (int argc, char *argv[]) { if (InitCVIRTE (0, argv, 0) == 0) return -1; /* out of memory */ if ((panelHandle = LoadPanel (0, sfeef.uir, PANEL)) 0) return -1; DisplayPanel (panelHandle); RunUserInterface (); DiscardPanel (panelHandle); return 0; } 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; } int CVICALLBACK Kaishi (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_COMMIT: if (t == 0) MessagePopup (错误,电源没开) ; else SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED, 0); break; } return 0; } int CVICALLBACK Time (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_TIMER_TICK: timer++; SetCtrlVal (panelHandle, PANEL_NUMERICGAUGE, timer); if (timer==20) {timer=0; SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED,0); } break; } return 0; } int CVICALLBACK Dianyuan (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_COMMIT: GetCtrlVal (panelHandle, PANEL_BINARYSWITCH, t); SetCtrlVal (panelHandle, PANEL_LED, t); break; } return 0; } 设计一窗口闪烁程序，使其每0.5秒闪烁一次。 表3-1 主要控件基本属性列表 控件类型 Constant Name 属性设置 面板 Panel PANEL 命令按钮 Command Button QUITBUTTON Callback Function QuitCallback Lable __Quit 双态按钮 Toggle Button TOGGLEBUTTON Callback Function FlashCB Initial State off Lable 控制按钮 定时器控件 Timer TIMER Callback Function FlashTimerCB