show other program result in QWindow

daisyvish

hi,
As we know project in Qt can be written in C++.but if want after clicking a push button can it possible to get output from python program and show on QLabel .
Actually i want to get resultant output from python code after clicking a button while our Qt project is in C++.
for example if i am doing image differencing (program written in python )then output of two image difference should be appear on Qt gui

mrjj

Hi and welcome to the forums
You can use QProcess to run python scripts
https://stackoverflow.com/questions/19185056/qprocess-not-executing-a-python-script

But if you need to show the difference between 2 images, i think you will have to let the python
save that to a file and then read in the c++ part.

daisyvish

if we are taking path of image through FileDialog in Qt C++ gui ,then how can we get that image path to python program..

mrjj

@daisyvish
With QProcess you can include arguments the the python app can read.
https://stackoverflow.com/questions/47276571/qprocess-passing-arguments-to-a-python-script

daisyvish

@jsulm @mrjj @SGaist
i have tried to run execute python program on button click but getting error ......
Qt program:---

QProcess p;
QStringList params;
params<<"C:/Users/user/Desktop/image/temp.py";
p.start("C:/Users/user/anaconda3/python.exe",params);
p.waitForFinished(-1);
qDebug()<<"finished";
QStringp_stdout=p.readAll();
qDebug()<<p_stdout;
QStringp_stderr=p.readAllStandardError();
if(!p_stderr.isEmpty());
qDebug()<<"Pythonerror:"<<p_stderr;
temp.py:---(python programm)

from PIL import Image
import numpy as np
def change(path1,path2):
im1=Image.open(path1,"r")
im2=Image.open(path2,"r")
buffer1=np.asarray(im1)
buffer2=np.asarray(im2)
buffer3=buffer1-buffer2
changed=Image.fromarray(buffer3)
im1.show()
im2.show()
changed.show()
changed.save(r"C:\Users\user\Desktop\image\changed.jpg")
return(changed.show)

change(r"C:\Users\user\Desktop\image\Vale.jpg",r"C:\Users\user\Desktop\image\Vale2.jpg")

ERROR on QT:
finished
""
Python error: "Traceback (most recent call last):\r\n File "C:/Users/user/Desktop/image/temp.py", line 1, in <module>\r\n from PIL import Image\r\n File "C:\Users\user\anaconda3\lib\site-packages\PIL\Image.py", line 94, in <module>\r\n from . import _imaging as core\r\nImportError: DLL load failed while importing _imaging: The specified module could not be found.\r\n"

Second approach in Qt:
QStringprogram("C:/Users/user/anaconda3/python.exe");
QStringListargs=QStringList()<<"C:/Users/user/Desktop/image/temp.py";
intexitcode=QProcess::execute(program,args);
#python program is same as temp.py

Error (Qt):
File "C:/Users/user/Desktop/image/temp.py", line 1, in <module>
from PIL import Image
File "C:\Users\user\anaconda3\lib\site-packages\PIL\Image.py", line 94, in <module>
from . import _imaging as core
ImportError: DLL load failed while importing _imaging: The specified module could not be found.

jsulm

@daisyvish Does your script work if you run it manually?
From what you posted the Python interpreter cannot find some modules.

And please try to format your code properly to make it easier to read.

daisyvish

@jsulm
yes my python code is running proprly .Even when i replace another program(i.e hello.py).That gave output without error on Qt itself.
& when executing temp.py on spider(anaconda) shows the output and save in specified location.

JonB

@daisyvish
If you edit your post to include the code tags, like @jsulm said, I will have a look at it.....

SGaist

Hi,

How are you calling your python script on the command line ?
Do you have any environment variable set that is different in Qt Creator ?

daisyvish

@mrjj @jsulm @SGaist
I have posted the program please once check that if any correction reqiured .I used anaconda IDE (spyder) for python.

daisyvish

@SGaist i am trying to call python program from QT button..how to check environment variables for QT?

jsulm

@daisyvish said in show other program result in QWindow:

how to check environment variables for QT?

You mean in "in QtCreator"? @SGaist did not ask about environment variables specific for Qt, but any variables which can influence Python.
Go to "Projects/YOUR_KIT/Run/Run Environment" and compare the environment variables there to what "set" outputs in cmd.exe

Muqadas noor

if you do this work,please also shared with me. I also need this