Variables in Locals and Expressions not accessible in QT Creator

Question

If I try to debug my C++ program in QT Creator the Locals and Expressions window shows me the variables in the program. However all the values show "< not accessible >".

Screenshot:

How do I get the values to show? I can print the values out with cout so I know they are initialized.

Edit: It seems like it only applies to strings

Specs/other:

• Windows 8, 64bit
• QT 5.2.0
• MinGW 32bit, I think 4.8
• QT Creator 3.0.0

Solution 1

Try to remove the checkmark at Tools/Options/Debugger/GDB/Load system GDB pretty printers, and see whether this makes a difference.

Solution 2

Solved:

For composite types (std::string and other classes) it doesn’t automatically convert to some default type (e.g. std::string to char*); so what you need to do it right-click on a value, then select the submenu Change local display format-> Raw structure, and then keep opening the symbol until you get something meaningful (when possible). E.g. for std::string, after you change to “Raw structure”, you get your actual string (by clicking the “+” sign to the left of your symbol) in: _M_dataplus->_M_p

Note that you can “Change local display format” for one symbol (the one you selected) or for all symbols of that type (e.g. you select a std::string, then all std::strings change to Raw structure)

From this link: http://qt-project.org/forums/viewthread/36121/

Credit goes to Gyll.

Comments

[rbaleksandar]

This is the answer. Also for Qt-specific types the debug information files need to be added for more in-depth debugging into the Qt library itself.