there are a qusition when run the project !!!!!!!!!!!prease help help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!! thank your!!!!!!!!!!!!!!!!

[lxlll]

why is the return value of the plotxy function negative?thanks for your to give a solution for this qusition!

[akath]

hi

negative value means ther is a error in your plotting.

[lxlll]

thanks for help

then,is it synor error?

[lxlll]

hi

   what is the error?please inspect the code for me,thank you very much!

the code is:

int CVICALLBACK GenerWave (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{

 
// double p;
 switch (event)
  {
 double *wave;
 double samples;
 double f;
 double phase;
 double cycnum;
 double sampcyc;
 double amp;
  case EVENT_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=sampcyc*cycnum; 
  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);
           
       PlotY (panelHandle,PANEL_GRAPH,wave,samples,VAL_DOUBLE,VAL_THIN_LINE,VAL_EMPTY_SQUARE,
           VAL_SOLID,1,VAL_RED);
 
  free(wave);
           
        
   break;
  }
 return 0;
}

[ISITEC_RIEPER]

What error number do you get ?
Is it - 10 The control is not the type expected by the function ?

The check if you use the right panelHandle (is it the same panel that calls
the CallBack ?) and control id. What kind of Graph do you use (Graph,
Stripchart?), maybe its the wrong graph for this function an you have to use
change the control from graph to stripchart or u have to use another
function, PlotXY f.e.

Greetings from Germany

Norbert Rieper




"lxlll" <x@no.email> schrieb im Newsbeitrag
news:1214386810048-731334@exchange.ni.com...
> hi
> &nbsp;&nbsp; what is the error?please inspect the code for me,thank you
> very much!
> the code is:
> int CVICALLBACK GenerWave (int panel, int control, int
> event,&nbsp;&nbsp;void *callbackData, int eventData1, int eventData2){
> &nbsp;//&nbsp;double p;&nbsp;switch (event)&nbsp;&nbsp;{&nbsp;double
> *wave;&nbsp;double samples;&nbsp;double f;&nbsp;double phase;&nbsp;double
> cycnum;&nbsp;double sampcyc;&nbsp;double amp;&nbsp;&nbsp;case
> EVENT_COMMIT:&nbsp;&nbsp;&nbsp; GetCtrlVal (panelHandle, PANEL_AMP,
> &amp;amp);&nbsp;&nbsp;GetCtrlVal (panelHandle, PANEL_SAMPCYC,
> &amp;sampcyc);&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;f=1.0/sampcyc;&nbsp;&nbsp;GetCtrlVal (panelHandle,
> PANEL_CYCNUM, &amp;cycnum);&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; GetCtrlVal
> (panelHandle, PANEL_PHASE, &amp;phase);&nbsp;&nbsp;&nbsp;
> samples=sampcyc*cycnum;&nbsp;&nbsp;
> wave=malloc(samples*sizeof(double));&nbsp;&nbsp;&nbsp; SineWave (samples,
> amp, f, &amp;phase, wave);&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;DeleteGraphPlot
> (panelHandle, PANEL_GRAPH, -1,
> VAL_IMMEDIATE_DRAW);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> //&nbsp;PlotY(panelHandle, PANEL_GRAPH, wave, samples, VAL_DOUBLE,
> VAL_THIN_LINE, VAL_EMPTY_SQUARE,VAL_SOLID, 1,
> VAL_RED);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PlotY
> (panelHandle,PANEL_GRAPH,wave,samples,VAL_DOUBLE,VAL_THIN_LINE,VAL_EMPTY_SQUARE,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> VAL_SOLID,1,VAL_RED);&nbsp;&nbsp;&nbsp;free(wave);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;&nbsp;&nbsp;}&nbsp;return
> 0;}