CODEWITHSUNDEEP
pythonc++qtqprocess
Oliver Brandon
Oliver Brandon

Reputation: 21

QProcess passing arguments to a python Script

from PIL import Image
def porcentaje(path):

    im = Image.open(path, "r")
    im.show()
    width, height = im.size
    type = im.mode
    format = im.format
    pixels=im.getdata()
    n = len(pixels)
   im=im.load()
   nblack = 0
   noblack=0

   for pixel in pixels:
       if pixel < 50:
           nblack += 1
       else:
           noblack+=1

porcentajefinal=(nblack*100)/n
print(porcentajefinal)
return(porcentajefinal)

(porcentaje(path))

mainwindow.cpp (QT Creator)

void MainWindow::on_pushButton_2_clicked()
{

    QString path = QFileDialog::getOpenFileName(this,
            tr("All Files (*)"));
     qDebug()<<path;

     QDir dir1("D:/QTCProjects/prueba");
     QFile file1("D:/QTCProjects/prueba/2_1.py");
     QString script1 = "D:/QTCProjects/prueba/2_1.py";
     QFile file2(script1);

     qDebug() << dir1.exists() << file1.exists() << file2.exists();
       //  these all result in true, true true
     QProcess *myProcess = new QProcess();
     myProcess->start("python.exe D:/QTCProjects/prueba/2_1.py" );
     myProcess->waitForFinished(-1);

      qDebug() << "myProcess:" << myProcess->readAll(); }

This python requires a variable called path to run and i get this variable in qtcreator with Qstring path, how i can give python this variable with Qprocess.

Upvotes: 1

Views: 2026

Answers (1)

eyllanesc
eyllanesc

Reputation: 243947

If you want to pass arguments to a script through the terminal, the following structure is used:

python.exe /path/of/your_script.py arg1 arg2 ... argn

Then to obtain the parameter we must use sys.argv which is a list that stores the following: 

['/path/of/your_script.py', 'arg1', 'arg2', ..., 'argn']

So in your case you should get the parameter through sys.argv[1]:

2_1.py

from PIL import Image
import sys

def porcentaje(path):

    im = Image.open(path, "r")
    im.show()
    width, height = im.size
    type = im.mode
    format = im.format
    pixels=im.getdata()
    n = len(pixels)
    im=im.load()
    nblack = 0
    noblack=0
    for pixel in pixels:
        if pixel < 50:
            nblack += 1
        else:
            noblack+=1

    porcentajefinal=(nblack*100.0)/n
    print(porcentajefinal)
    return(porcentajefinal)

path = sys.argv[1]
porcentaje(path)

On the side of Qt, python.exe is the main program, and the other parameters are the arguments, so your code must have the following structure:

void MainWindow::on_pushButton_2_clicked()
{
    QString path = QFileDialog::getOpenFileName(this, "All Files (*)");
    qDebug()<<path;
    if(!path.isEmpty()){
        QDir dir("D:/QTCProjects/prueba");
        QFileInfo info(dir, "2_1.py");
        qDebug() << dir.exists() << info.exists();
        QProcess process;
        process.start("python.exe", QStringList()<< info.absoluteFilePath() << path);
        process.waitForFinished(-1);
        qDebug() << "myProcess:" << process.readAll();
    }
}

Upvotes: 2

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