Trouble using DcmDecimalString

[Rich in Soquel]

dcmtk 3.6.4, Windows 10, Microsoft Visual Studio 2010:

switch(VRe)
{
case EVR_DS:
DcmDecimalString ds(DcmTag(TagGroup, TagElement), 0); // (0018,2005) SliceLocationVector
char *str = NULL;

element->getString(str, len);
// Here str == "3.25\3.25\3.25\3.270833\3.270833\3.291667\..." len==22580
ds.putString(str);
OFVector<Float64> doubleVals;
status = ds.getFloat64Vector(doubleVals);
//doubleVals look correct (double version of each DS item, length is correct), status is good

return ERR_NO_ERROR; // Don’t do anything else

On executing the return:
Run Time Check Failure #2 - Stack around the variable 'ds' was corrupted.

What am I doing wrong? Thanks for any help!

[J. Riesmeier]

Your code is not complete, so it is hard to help you in this regard.