Hello,

In the application I'm working on, i've got a class CfgMgr with a method: getValue() that's supposed to return a QString:

Qt Code: 
  1. QString CfgMgr::getValue()
  2. {
  3.     QString qstrValue;
  4.     char* cstr = 0; // null pointer
  5.     if (Get_Value(&cstr)){ // external call that allocates memory using 'new'
  6.         qstrValue = cstr; // copies the data?
  7.         delete [] cstr;
  8.     }
  9.     return qstrValue;
  10. }
  11.  
  12. QString myValue = CfgMgr::getValue();
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This works fine most of the time, but sometimes the application segfaults at qatomic_i386.h:80 after coming from QString:perator=(..)

I suspect that the problem is one of dangling pointers. I tried doing the following since QByteArray supposedly performs a deep copy:

Qt Code: 
  1. QString CfgMgr::getValue()
  2. {
  3.     QString qstrValue;
  4.     char* cstr = 0; // null pointer
  5.     if (Get_Value(&cstr)){ // external call that allocates memory using 'new'
  6.         QByteArray ba(cstr); // deep copy
  7.         delete [] cstr;
  8.         qstrValue = ba;
  9.     }
  10.     return qstrValue;
  11. }
  12. QString myValue = CfgMgr::getValue();
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Unfortunately, this does not seem to work either. This might just be the symptom of a problem created elsewhere but it's not unlikely that i've made a mistake here either.

Does anyone see any obvious errors ?

Any help would be greatly appreciated.