需求:纯Qt,把多张图片合成到一个PDF文件中
// 合成PDF // include <QPdfWriter> QString pdfFileName = "D:\\a.pdf"; QStringList imageFileNameList = {"C:\\Users\\admin\\Documents\\Eloam\\Image\\1.jpg", "C:\\Users\\admin\\Documents\\Eloam\\Image\\2.jpg", "C:\\Users\\admin\\Documents\\Eloam\\Image\\3.jpg"}; QFile pdfFile(pdfFileName); pdfFile.open(QIODevice::WriteOnly); QPdfWriter *pdfWrite = new QPdfWriter(&pdfFile); pdfWrite->setPageSize(QPagedPaintDevice::A4); pdfWrite->setResolution(300); pdfWrite->setPageMargins(QMarginsF(30,30,30,30)); pdfWrite->setPageOrientation(QPageLayout::Portrait); // 设置方向,Portrait 竖,Landscape 横 QPainter *pPainter = new QPainter(pdfWrite); QRect rect = pPainter->viewport(); QPixmap img; QSize imgSize; for (int i=0;i<imageFileNameList.count();i++) { // 将图片写入PDF页面 img.load(imageFileNameList.at(i)); imgSize = img.size(); imgSize.scale(rect.size(), Qt::KeepAspectRatio); pPainter->setViewport((rect.width() - imgSize.width()) / 2, (rect.height() - imgSize.height()) / 2, imgSize.width(), imgSize.height()); pPainter->setWindow(img.rect()); pPainter->drawPixmap(0,0,img); if((i+1) != imageFileNameList.count()) pdfWrite->newPage(); } delete pPainter; pPainter = nullptr; delete pdfWrite; pdfWrite = nullptr; pdfFile.close();