qt调用的python脚本程序和qml控件之间相互调用

在Qt中调用Python脚本程序可以使用QProcess类，而在qml控件和Python脚本程序之间的通信可以使用Python的标准输入输出流。以下是一个简单的示例：

main.cpp:

#include <QCoreApplication>
#include <QProcess>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QProcess *process = new QProcess(&a);
    process->setProgram("python");
    process->setArguments(QStringList() << "script.py");

    QObject::connect(process, &QProcess::readyReadStandardOutput, [&]() {
        QString output = process->readAllStandardOutput();
        qDebug() << "Python output: " << output;
    });

    process->start();

    return a.exec();
}

script.py:

print("Python script is running...")
while True:
    input_str = input()
    if input_str == "quit":
        break
    print("Received input: " + input_str)

Qml中可以使用Qt的QProcess类或PyQt的QProcess类来调用Python脚本程序，也可以使用PyQt的QPythonRunner类直接运行Python代码。在qml中与Python脚本程序之间的通信可以使用Python的标准输入输出流。

例如，使用Qt的QProcess类：

import QtQuick 2.0

Item {
    id: root

    Button {
        text: "Run Python script"
        onClicked: {
            var process = Qt.createQmlObject('import QtQuick 2.0; import QtQuick.Controls 2.0; Process { program: "python"; arguments: ["script.py"]; }', root);
            process.readyReadStandardOutput.connect(function() {
                var output = process.readAllStandardOutput();
                console.log("Python output: " + output);
            });
            process.start();
        }
    }
}

使用PyQt的QProcess类：

import QtQuick 2.0
import PyQt5.QtCore 1.0
import PyQt5.QtGui 1.0
import PyQt5.QtWidgets 1.0

Item {
    id: root

    Button {
        text: "Run Python script"
        onClicked: {
            var process = new QProcess();
            process.setProgram("python");
            process.setArguments(["script.py"]);
            process.readyReadStandardOutput.connect(function() {
                var output = process.readAllStandardOutput();
                console.log("Python output: " + output);
            });
            process.start();
        }
    }
}

使用PyQt的QPythonRunner类：

import QtQuick 2.0
import PyQt5.QtCore 1.0
import PyQt5.QtGui 1.0
import PyQt5.QtWidgets 1.0

Item {
    id: root

    Button {
        text: "Run Python code"
        onClicked: {
            var runner = new QPythonRunner();
            runner.runCode("print('Hello from Python!')");
            runner.readyReadStandardOutput.connect(function() {
                var output = runner.readAllStandardOutput();
                console.log("Python output: " + output);
            });
        }
    }
}