vtkCellPicker is not work for a stl file with directory in Chinese

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Hello Everyone!
I use vtkSTLReader read a stl file with set filename by gbk(encoding of Chinese)，I found that vtkCellPicker is not work.
I can get cell id byuse Pick() ,but i can’t get the position of it.
In addition, it work for a English directory

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QString fileName;
char * ch= fileName.toLocal8Bit().data();