linux下qt使用无窗体类获取并修改打印机的纸张来源到指定的纸盒

在Linux下使用Qt可以通过QPrinter类来获取和修改打印机的纸张来源到指定的纸盒。

首先，创建一个QPrinter对象并设置打印机名称和纸张大小：

QPrinter printer(QPrinter::HighResolution);
printer.setPrinterName("printer_name");
printer.setPageSize(QPageSize(QPageSize::A4));

然后，使用QPrintDialog类来显示打印对话框并获取用户选择的打印机设置：

QPrintDialog dialog(&printer);
if (dialog.exec() != QDialog::Accepted) {
    return;
}

接下来，通过QPrinterInfo类获取所有打印机信息并遍历查找指定名称的打印机：

QList<QPrinterInfo> printers = QPrinterInfo::availablePrinters();
for (const QPrinterInfo& printerInfo : printers) {
    if (printerInfo.printerName() == printer.printerName()) {
        // do something with printerInfo
        break;
    }
}

在找到指定打印机后，使用QPrintEngine类获取打印引擎并设置纸张来源和纸盒号：

QPrinterEngine* engine = printer.printEngine();
if (engine) {
    QPrintEngine::PropertyMap properties = engine->propertyStore();
    properties.insert(QPrintEngine::PP_SourceName, QVariant("Tray 2"));
    properties.insert(QPrintEngine::PP_CustomBase + 250, QVariant(2));
    engine->setPropertyStore(properties);
}

最后，使用QPainter类绘制需要打印的内容并打印：

QPainter painter(&printer);
painter.drawText(100, 100, "Hello World!");
painter.end();

完整代码示例：

#include <QtPrintSupport>

int main(int argc, char* argv[]) {
    QApplication app(argc, argv);

    QPrinter printer(QPrinter::HighResolution);
    printer.setPrinterName("printer_name");
    printer.setPageSize(QPageSize(QPageSize::A4));

    QPrintDialog dialog(&printer);
    if (dialog.exec() != QDialog::Accepted) {
        return 0;
    }

    QList<QPrinterInfo> printers = QPrinterInfo::availablePrinters();
    for (const QPrinterInfo& printerInfo : printers) {
        if (printerInfo.printerName() == printer.printerName()) {
            QPrinterEngine* engine = printer.printEngine();
            if (engine) {
                QPrintEngine::PropertyMap properties = engine->propertyStore();
                properties.insert(QPrintEngine::PP_SourceName, QVariant("Tray 2"));
                properties.insert(QPrintEngine::PP_CustomBase + 250, QVariant(2));
                engine->setPropertyStore(properties);
            }
            break;
        }
    }

    QPainter painter(&printer);
    painter.drawText(100, 100, "Hello World!");
    painter.end();
    
    return app.exec();
}