SAFEARRAY in Labview

[Svingen]

I have seen questions like this before in this forum, but no solution. My question is how to make, pass a safearray into an activex method (IWebBrowwer for my part).

Thanks

[Svingen]

Solved the problem by using TCP/IP vi's and ordinary HTTP protocol commands. Would still like to know if it is possible to use safearreys in labview, and if so: how?

[Feroz]

Hi,
Extracting Information from a SAFEARRAY in LabVIEW:

There are two ways you could go about this.

The first would be to create a cluster with the same data types as a SAFEARRAY and use the Variant To Data for LabVIEW 6.x and To G Data for LabVIEW 5.x.

Here is the structure for a SAFEARRAY:

typedef struct tagSAFEARRAY
{
USHORT cDims;
USHORT fFeatures;
ULONG cbElements;
ULONG cLocks;
PVOID pvData;
SAFEARRAYBOUND rgsabound[ 1 ];
} SAFEARRAY;

So you could make a cluster with these same data types in it, in the same order. A USHORT is an unsigned short (U8), and ULONG is unsigned long (U32) and PVOID is a pointer to the data and SAFEARRAYBOUND is another cluster with this structure:

typedef struct tagSAFEARRAYBOUND
{
ULONG cElements;
LONG l
Lbound;
} SAFEARRAYBOUND;

A web page that describes all the different parameters is linked below.
MICROSOFT Support page: SAFEARRAY


The second is possibly the better/easier way to do this. You could write a wrapper DLL in C code that just passes out the array, which is all you really care about. That way you wouldn't need to worry about creating the cluster just right.

Good Luck
FerozP

[Svingen]

Thanks, but this doesn't help much. The problem is the PVOID that point to the actual data. Besides, by making a DLL/C wrapper for an ActiveX object, then what's the idea of using ActiveX?