I need to design a VBO, the step is 
1, run a command , such as
tesseract.exe --tessdata-dir .\tessdata  C:\Users\seiya\Desktop\random.jpg  - -l eng --psm 8
 
then it will return a string , refer to the attachment.
 
2, then I need to get the 'returning string'
 
can anyone help me ? thanks