无法在Qt

时间:2019-03-07 16:43:41

标签: qt

由于某些原因,我无法在纸上打印。所以我有一台功能正常的打印机。我使用下面的代码打印一个qDialog和一些图片:

QPrinter printer;
QPainter painter;
painter.begin(&printer);

double xscale = printer.width() / double(window->width());
double yscale = printer.height() / double(window->height());
double scale = qMin(xscale, yscale);
painter.scale(scale, scale);

QPrintDialog printDialog(&printer, this);
if (printDialog.exec() == QDialog::Accepted) {
    bool skip = true;

    if(ui->generalInfos->isChecked()) {
        //window is a QDialog I want to print out
        window->render(&painter);
        skip = false;
    }

    QList<Document *> docs;

    if(worker) {
        //a list with path to pictures
        docs = worker->getDocuments();
    }

    for(auto document : docs) {
        if(ui->Documents->isChecked(document->getID())) {
            for(auto scan : document->getScans()) {

                if(!skip) {
                    printer.newPage();
                }
                else {
                    skip = false;
                }

                painter.resetTransform();

                const QImage image(scan);
                const QPoint imageCoordinates(0,0);

                xscale = printer.width() / double(image.width());
                yscale = printer.height() / double(image.height());
                scale = qMin(xscale, yscale);
                painter.scale(scale, scale);

                painter.drawImage(imageCoordinates,image);
            }
        }
    }
}

painter.end();

,它不起作用。什么都没有打印,Qt抛出错误:

QWin32PrintEngine::newPage: EndPage failed (The parameter is incorrect.)
QWin32PrintEngine::end: EndPage failed (0x31210cf7) (The parameter is incorrect.)

有人可以帮我吗?

1 个答案:

答案 0 :(得分:1)

如果您简化代码,则可能会找到解决方案。 因此,让我们从选择打印机开始,然后(之后!)开始向打印机绘画:

QPrinter printer;
QPrintDialog printDialog(&printer, this);
if (printDialog.exec() == QDialog::Accepted) 
{
    QPainter painter;
    painter.begin(&printer);
    window->render(&painter);
    painter.end();
}

如果这可行,请将更多旧代码添加到上面的草图中。 如果它不起作用,则您的程序或环境(选定的打印机?)中有其他问题是错误的,因此您需要将错误查找范围扩展到此处未向我们显示的内容。