I am trying to use the cache to store/retrieve data but I cannot actually figure it out how?
I didn't made a dedicated example for it so I just tested it with a login form, trying to store the user inside the cache and retrieve it on QDialog::exec().
I made a class
Qt Code: 
  1. class InfoUtil{
  2. public:
  3.     QString nUtil;
  4.     void setUtil(QString a);
  5.     const char* retUtil();
  6. };
  7.  
  8. void InfoUtil::setUtil(QString a){
  9.     nUtil=a;
  10. }
  11. const char* InfoUtil::retUtil(){
  12.     return nUtil.toStdString().c_str();
  13. }
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Here is the block which checks if the login credentials are ok, and if they are it does emits some signals etc and cache the login user
Qt Code: 
  1. if(util=="admin" && parola=="admin"){
  2. QCache<const char*,InfoUtil> cache;
  3. iu->setUtil(util);
  4. cache.clear();
  5. cache.insert(iu->retUtil(),iu);
  6. }
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util is a string which gets it's data from QLineEdit.
When the connection dialog opens it should have the cached "admin" set to the QLineEdit, but I get symbols.
Here is how I try to retrieve the data and set it to QLineEdit inside the dialog's constructor.
Qt Code: 
  1. QCache<const char*,InfoUtil> cache;
  2. const char* abc;
  3. cache.take(abc);
  4. txtUtil=new QLineEdit(abc);
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I know it's wrong but can someone send me to the right direction?