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moonlit · #1 (**permalink**) 07-23-2008

I'm using Variants for calling MapPoint functions and I'm having all kind of problems when calling the AddPolyline function.
Basically I create a SafeArray where I store all the locations (2 for this example)
and after that I call the AddPolyline function with that array. When I make that call the program crashes.

Anybody has any idea where it may be the problem?

Thanks

Code:

    Variant oMap;
    Variant oApp;

    OleContainer->Visible = false;

    OleContainer->DestroyObject();
    OleContainer->CreateObject("MapPoint.Map",false);
    oMap  = OleContainer->OleObject;
    oApp =  oMap.Exec (PropertyGet("Application"));


    SAFEARRAY *pSA;
    SAFEARRAYBOUND aDim[1];    // a one dimensional array
    aDim[0].lLbound= 0;
    aDim[0].cElements= 2;
    pSA= SafeArrayCreate(VT_VARIANT,1,aDim);  // create a 1D SafeArray of VARIANTS

    HRESULT hr= S_OK;
    if (pSA != NULL)
    {
      long aLong[1];
      for (long i= aDim[0].lLbound; i< (aDim[0].cElements + aDim[0].lLbound); i++)
      {
          Variant oloc = oMap.Exec ( Function("GetLocation") << 38.8186 << -77.1361 << 0.1  );
          aLong[0]= i;
          if (hr == SafeArrayPutElement(pSA, aLong, &oloc))
          {
               int a=5;
          }
      }
    }

    VARIANT v;
    VariantInit(&v);
    v.vt = VT_BYREF|VT_ARRAY;
//    v.pparray = &pSA;
    v.parray = pSA;

    Variant myShapes2 =  oMap.Exec(PropertyGet("Shapes"));
    myShapes2.Exec ( Function("AddPolyline") << v );

    OleContainer->Visible = true;
    OleContainer->DoVerb(ovShow);

**Wilfried** · #2 (**permalink**) 07-24-2008

Hi,

Can you tell us what you mean by 'crash'? Do you have an error or exception error? What is the error or error message?

moonlit · #3 (**permalink**) 07-24-2008

Quote:

Originally Posted by Wilfried

Hi,

Can you tell us what you mean by 'crash'? Do you have an error or exception error? What is the error or error message?

Thanks for your reply.
I get an error that says 'The parameter is incorrect'

**Wilfried** · #4 (**permalink**) 07-25-2008

Hi,

I'm not sure. But you put the address of oLoc to the array (&oLoc), I'm not sure this is correct. Also can you test if oLoc is valid Location? You can do this for example by placing a pushpin with the same oLoc or so.

eric.hill · #5 (**permalink**) 08-04-2008

This is from one of my mapping integration applications:

Quote:

/*
Sweet Jesus this was a pain in the ass to get right.
MapPoint doesn't want a typical variant array of integers,
rather it wants a variant array of variant objects, with
each variant object holding an integer.

Without this indirection, MapPoint simply throws the
dreaded "The parameter is incorrect" error message.
*/
VARIANT larray_to_varray(long la[], long size = 5) {
#pragma warning(disable: 4267)
#pragma warning(disable: 4018)
COleSafeArray varArray;
DWORD elements[] = { size };
varArray.Create(VT_VARIANT, 1, elements);
for (long i = 0; i < size; i++) {
_variant_t v(la[i]);
varArray.PutElement(&i, &v);
}
return varArray.Detach();
}

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Problem calling AddPolyline in C++

Problem calling AddPolyline in C++

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