qt5实现的pdf阅读器 （可支持win和linux），基于webjs

# QPdf PDF viewer widget for Qt 5. This is a wrapper of [pdf.js](https://mozilla.github.io/pdf.js) JavaScript PDF renderer using Qt WebEngine.  This qmake-based project defines two build targets: `qpdf` shared library, and an example PDF viewer (`pdfviewer`) based on `qpdf` library. Should yoo want to integrate a PDF view into your project, you need to take `qpdf` library only, you do not need `pdfviewer` (though you may use it as inspirational example for your project). So you may copy `qpdflib` into your project and build it as a shared library to be linked with your code. How to compile -------------- * Make sure you have Qt 5.9.x or later installed. Earlier Qt versions are not supported. * Open `qpdf.pro` project file in QtCreator * Build and run Open PDF files -------------- `qpdf` library offers two ways to open PDF files: * [QPdfWidget::loadData(const QByteArray& pdfData);](https://github.com/Archie3d/qpdf/blob/bc1be22d25f6f3fc8310cc87f6afcfee6e480d8d/qpdflib/qpdfwidget.h#L52) * [QPdfWidget::loadFile(const QString& filePath);](https://github.com/Archie3d/qpdf/blob/bc1be22d25f6f3fc8310cc87f6afcfee6e480d8d/qpdflib/qpdfwidget.h#L46) `loadData` method serializes PDF data as base64 string and injects it into JavaScript environment. This may fails however when loading huge PDF files. `loadFile` can load PDFs of any size, however the method is blocked by default due to the cross-origin security restriction, since it uses WebEngine's load URL method. In order to make this method work, you have to disable web security by passing `--disable-web-security` argument to your `QApplication` instance (see how its done in [pdfviwer example](https://github.com/Archie3d/qpdf/blob/bc1be22d25f6f3fc8310cc87f6afcfee6e480d8d/pdfviewer/main.cpp#L31)). Debugging --------- If something goes wrong, as sometimes it does, you may use Chromium debug console to assess the situation: * Define QTWEBENGINE_REMOTE_DEBUGGING environment variable to activate WebEngine debug server, e.g. `QTWEBENGINE_REMOTE_DEBUGGING=0.0.0.0:9999` * Launch your `qpdf`-based application * Open Chrome or Chromium web browser and navigate to http://localhost:9999 * Select the running application link in the browser and you will be presented with a familiar web page inspection console. Qt Quick Compiler Issue ----------------------- This project includes JavaScript `*.js` files as resources. Qt Creator may try to add them to QML resources instead, which makes the web engine unable to load `*.js` from normal resources. This happens on Windows in `Release` builds automatically (but not in `Debug` for some reason). Make sure to disable Qt Quick Compiler in your project build settings: