| Using Callable IDL/ActiveX component to access variables [message #14070] |
Fri, 15 January 1999 00:00 |
Mark McGillion
Messages: 14
Registered: December 1997
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Junior Member |
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Hi,
I am using callable IDL from a C++Builder application on a WindowsNT
(x86) platform. I have embedded the IDLDrawWidget ActiveX component
within a form and I am successfully starting up IDL and plotting to
the IDLDrawWidget component. To do this, I use the
IDLDrawWidget.ExecuteStr() function and a .PRO file containing
additional functions and procedures.
My problem is that I cannot access the variables contained within
my IDL .PRO file. I have several COMMON global variables that I need
to access. I am trying to use the IDLDrawWidget.GetNamedData(char*)
function which should return a VARIANT data type that references the
IDL variable.
However, the return value is UNDEFINED. When I examine the help files,
I cannot find a reference to this function. Instead, a reference is
made to another function IDL_FindNamedVariable(char*, int) that
returns an IDL_VPTR that references the variable.
Question:
1. Am I using the correct function to access the data variable?
2. Why does the help file contain info on a completely different
function?
3. I am currently not linking the IDL32.DLL to my application.
However, when I examine the DLL, I see that it contains the
IDL_FindNamedVariable(char*, int) function, but not the
GetNamedData(char*) function. It is possible that I am getting
confused between the activeX component functions and the DLL
functions?
4. Should I be using the DLL functons as well/instead of the activeX
component functions?
Here is my C++ code:
TIDLDrawWidget *IDLDrawWidget1;
void __fastcall TMainForm::ButtonAnalysisClick(TObject *Sender)
{
float *Data;
char *var;
Variant ptr;
var = new char[100]; //space to hold the variable name
var = "C_buffer"; //IDL COMMON variable
Data = new float [1000];
ptr = IDLDrawWidget1->GetNamedData(var);
// or should I use IDL_VPTR ptr = IDL_FindNamedVariable(var,
FALSE);
Data = (float*) ptr;
AnalysisForm->AnalyseData(Data);
}
Please help as I cannot find a way out of this seemingly simple
problem.
Sincerely yours
Mark
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