How
to display a char* array with NI graph control?
My
developing environment is VC2005sp1 + MeasurementStudio8.1.1.
It
seems that PlotY
could
only accept CNIVector type as input data source and PlotY could not accecpt char* array
or unsigned int array as input data source. Is it true?
My
data is stored in a large char* array. Each character(or Byte) of this array
represents a value point. The size of this char* is of LARGE_INTEGER type. How
could I display every Bytes of this char* array with NI graph control?
My
code looks like this:
CNiReal32Vector mNIVectorforDisplay; // NI vector for display.
// pYDisplay is the points of char*
array. liSizeofField
is the size of this array, which is of LARGE_INTEGER type
mNIVectorforDisplay = CNiReal32Vector(liSizeofField.QuadPart,
(char*)pYDisplay);
// The above two line can work
through, while the following trigers an error.
pWaveGraph->GetPlots().Item("Y").PlotY(mNIVectorforDisplay);
Would
you plz tell me how to realize this scenario?
I’m
looking forward to your response and kindly help.
Thank
you.
2,
I partially solve this problem now. I use "for" loop and "=" operator to fufill the task, which is quiet slow and looks ugly.
The code looks like this:
for (int i=0; i<1000; i++)
{
mNIVectorforDisplay[i] = *(LPBYTE)((unsigned char*)((pYData)+i));
}
m_Wave.Plots.Item("Y").PlotY(mNIVectorforDisplay);
My question is : Could NI Graph control support native C++ arrays and pointers, not wrapped CNIVector** class.
I go through some of the code behind, I found that inside the
CNIVector** class constructor, low efficient "for" loop and "=" operator
are used to convert a C++ array to
wrapped CNIVector** class. This manner could not be attractive in the need for speed and efficiency.
Who can tell me how to solve this problem?
