main.cpp Example File

iconextractor/main.cpp

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  #include <QtWin>

  #include <QGuiApplication>
  #include <QScopedArrayPointer>
  #include <QStringList>
  #include <QPixmap>
  #include <QImage>
  #include <QFileInfo>
  #include <QDir>
  #include <iostream>

  /* This example demonstrates the Windows-specific image conversion
   * functions. */

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

      QStringList arguments = QCoreApplication::arguments();
      arguments.pop_front();
      const bool large = !arguments.isEmpty() && arguments.front() == "-l";
      if (large)
          arguments.pop_front();
      if (arguments.size() < 1) {
          std::cout << "Usage: iconextractor [OPTIONS] FILE [IMAGE_FILE_FOLDER]\n\n"
                       "Extracts Windows icons from executables, DLL or icon files\n"
                       "and writes them out as numbered .png-files.\n\n"
                       "Options: -l    Extract large icons.\n\n"
                       "Based on Qt " << QT_VERSION_STR << "\n";
          return 1;
      }
      const QString sourceFile = arguments.at(0);
      QString imageFileRoot = arguments.size() > 1 ? arguments.at(1) : QDir::currentPath();
      const QFileInfo imageFileRootInfo(imageFileRoot);
      if (!imageFileRootInfo.isDir()) {
          std::cerr << imageFileRoot.toStdString() << " is not a directory.\n";
          return 1;
      }

      const UINT iconCount = ExtractIconEx((wchar_t *)sourceFile.utf16(), -1, 0, 0, 0);
      if (!iconCount) {
          std::cerr << sourceFile.toStdString() << " does not appear to contain icons.\n";
          return 1;
      }

      QScopedArrayPointer<HICON> icons(new HICON[iconCount]);
      const UINT extractedIconCount = large ?
          ExtractIconEx((wchar_t *)sourceFile.utf16(), 0, icons.data(), 0, iconCount) :
          ExtractIconEx((wchar_t *)sourceFile.utf16(), 0, 0, icons.data(), iconCount);
      if (!extractedIconCount) {
          qErrnoWarning("Failed to extract icons from %s", qPrintable(sourceFile));
          return 1;
      }

      std::cout << sourceFile.toStdString() << " contains " << extractedIconCount << " icon(s).\n";

      imageFileRoot = imageFileRootInfo.absoluteFilePath() + QLatin1Char('/') + QFileInfo(sourceFile).baseName();
      for (UINT i = 0; i < extractedIconCount; ++i) {
          const QPixmap pixmap = QtWin::fromHICON(icons[i]);
          if (pixmap.isNull()) {
              std::cerr << "Error converting icons.\n";
              return 1;
          }
          const QString fileName = QString::fromLatin1("%1%2.png").arg(imageFileRoot)
              .arg(i, 3, 10, QLatin1Char('0'));
          if (!pixmap.save(fileName)) {
              std::cerr << "Error writing image file " << fileName.toStdString() << ".\n";
              return 1;
          }
          std::cout << "Wrote image file "
                    << QDir::toNativeSeparators(fileName).toStdString() << ".\n";
      }
      return 0;
  }