How can Qt dynamically load libraries based on a configuration file?

In Qt, the QSettings class can be used to read and write configuration files. Here is an example code that demonstrates how to dynamically load libraries based on a configuration file.

#include <QCoreApplication>
#include <QSettings>
#include <QLibrary>
#include <QDebug>

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

    // 读取配置文件
    QSettings settings("config.ini", QSettings::IniFormat);
    QString libraryPath = settings.value("Library/Path").toString();
    QString libraryName = settings.value("Library/Name").toString();

    // 动态加载库
    QLibrary library(libraryPath + "/" + libraryName);
    if (library.load()) {
        qDebug() << "Library loaded successfully.";

        // 使用加载的函数
        typedef void (*MyFunction)();
        MyFunction myFunction = (MyFunction) library.resolve("myFunction");
        if (myFunction) {
            myFunction();
        } else {
            qDebug() << "Failed to resolve the function.";
        }

        // 卸载库
        library.unload();
    } else {
        qDebug() << "Failed to load the library.";
    }

    return a.exec();
}

In the above code, the configuration file “config.ini” is read using the QSettings class. Next, a library file with a specified path and name is dynamically loaded using the QLibrary class. If the loading is successful, the resolve() function is used to obtain a pointer to a function in the library and execute the corresponding function. Finally, the library file is unloaded using the unload() function.

It is important to note that the content of the configuration file “config.ini” should be as follows:

[Library]
Path=/path/to/library
Name=libraryName.so

“Path” refers to the location of the library file, while “Name” is the name of the library file. Please adjust the path and name of the configuration file according to your specific situation.

Furthermore, it is necessary to add the corresponding library dependencies in the .pro file as shown below:

LIBS += -l/path/to/library/libraryName.so

Replace the placeholder “/path/to/library/libraryName.so” with the actual path and name of the library file in the code above.

Please note that the code above is an example based on Unix-like systems. If you need to load dynamic libraries in a Windows system, please change the file extension in the code to “.dll” and make appropriate modifications as necessary.