c++ - QT Read file, convert to int and use as initial slider value -

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i've made horizontal slider, value being saved in text file. after app closed slider resets initial value of "1". using -

ui->horizontalslider->setvalue(read());

i want read value of file using read() function , set initial value slider results in value being restored / saved.

this read(); function- 

int read(){     std::fstream readfile;     readfile.open("bin\ram.dat");     std::string value;     readfile << value;     int value2 = atoi(value.c_str());     return value2; }

after lot of different variable types being used , few conversion not work. question- how set initial value of slider int located in "bin\ram.dat"? i'm beginner tips or clues more welcome. thanks! (i've googled before posting , found few codes did not work here)


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