VARIANT structure in qt

hardikgarg19

I am using a camera that returns a pointer to the 2D safe array containing the picture information. I need to display this picture on the GUI. What is the best way for it?
I am trying to convert the safe array in QTByte array but I am not able to get all the values.

SGaist

Hi and welcome to devnet,

Can you show that structure ?
Can you show the code you are using ?

hardikgarg19

Hello,
Below is the code:

VARIANT var_array;
pMedleyUcam->GetImageData(&var_array);

GetImageData returns a pointer to 2D array. In the VARIANT structure, there is SAFEARRAY **pparray. Now, I need to show this SAFEARRAY as an image. So, I am trying to convert it into the QBytearray. But, I don't know the size of the SAFEARRAY. How can I solve this problem?

I used the code below to get the size, but, I am not able to get the 2D array size.

long iLBound, iUBound;
char * data;
SafeArrayGetLBound((*var_array.pparray),2,&iLBound);
SafeArrayGetUBound((*var_array.pparray),2,&iUBound);
SafeArrayAccessData((*var_array.parray),(void**)(&data));
long sz=iUBound-iLBound+1;

hskoglund

Hi, to get the size of the SAFEARRAY, because it's 2D, you need to ask for the lower and upper bounds of both the dimensions, say something like this:

long iLBoundX, iUBoundX,iLBoundY, iUBoundY;
char * data;
SafeArrayGetLBound((*var_array.pparray),1,&iLBoundX);
SafeArrayGetUBound((*var_array.pparray),1,&iUBoundX);
SafeArrayGetLBound((*var_array.pparray),2,&iLBoundY);
SafeArrayGetUBound((*var_array.pparray),2,&iUBoundY);
SafeArrayAccessData((*var_array.parray),(void**)(&data));
long szX=iUBoundX-iLBoundX+1;
long szY=iUBoundY-iLBoundY+1;

Note: this is a just a guess!