LabWindows实例制作.doc

制作CVI实例
新建一个.prj,命名SIGGEN
在这个prj中新建SIGGEN.uir,
面板设计，在面板中新建Numeric控件，按需求设置ConstantName和DataType，
记得附上Label名
新建CommandButton控件,按需求设置ConstantName和CallBackFunction
程序设计
检查、完善头函数
定义变量
获取变量，语句如：GetCtrlVal(panelHandle,PANEL_AMP,&amp);
编译（在CVI中区分大小写）
实例完整代码如下
#include<ansi_c.h>
#include<analysis.h>
#include<cvirte.h>
#include<userint.h>
#include"SIGGEN.h"

staticintpanelHandle;

intmain(intargc,char*argv[])
{
if(InitCVIRTE(0,argv,0)==0)
return-1; /*outofmemory*/
if((panelHandle=LoadPanel(0,"SIGGEN.uir",PANEL))<0)
return-1;
DisplayPanel(panelHandle);
RunUserInterface();
DiscardPanel(panelHandle);
return0;
}

intCVICALLBACKGenerWave(intpanel,intcontrol,intevent,
void*callbackData,inteventData1,inteventData2)
{
switch(event)
{
doubleamp;
doublesampcyc;
doublef;
doublephase;
doublecycnum;
doublesamples;
double*wave;

caseEVENT_COMMIT:
GetCtrlVal(panelHandle,PANEL_AMP,&amp);
GetCtrlVal(panelHandle,PANEL_SAMPCYC,&sampcyc);
f=1.0/sampcyc;
GetCtrlVal(panelHandle,PANEL_CYCNUM,&cycnum);
GetCtrlVal(panelHandle,PANEL_PHASE,&phase);
samples=cycnum*sampcyc;
wave=malloc(samples*sizeof(double));
SineWave(samples,amp,f,&phase,wave);
DeleteGraphPlot(panelHandle,PANEL_GRAPH,-1,VAL_IMMEDIATE_DRAW);
PlotY(panelHandle,PANEL_GRAPH,wave,samples,VAL_DOUBLE,VAL_THIN_LINE,VAL_EMPTY_SQUARE,VAL_SOLID,1,VAL_RED);
free(wave);

break;
}
return0;
}

intCVICALLBACKCLOSE(intpanel,intcontrol,intevent,void*callbackData,inteventData1,inteventData2)
{
switch(event)
{
caseEVENT_COMMIT:
QuitUserInterface(0);
break;
}
return0;
}

执行界面如下

上述实例，参考书《LabWindows虚拟仪器设计史君成等著》62～64页