read input file different type

i have input file as vtu

i am very struggling how to read the pressure value.

<DataArray type="Float64" Name="pressure" format="binary" RangeMin="50" RangeMax="80">

AQAAAACAAADIAAAAEwAAAA==eJxjYAABTwcGqtIhdKcBP1cOBw==

by paraview AQAAAACAAADIAAAAEwAAAA==eJxjYAABTwcGqtIhdKcBP1cOBw== are pressure value ( 50 50 50 50 80 etc)

[KSSV]

YOu want to read in paraview or matlab?

[vaya putra]

read in MATLAB,

i need input file that format in vtu file.

when i used 'fopen' this the data AQAAAACAAADIAAAAEwAAAA==eJxjYAABTwcGqtIhdKcBP1cOBw==

with this input i can not calculate the input file.

it should be as a pressure value.

should i convert the input file?

please help me