Add iconextractor example for image conversion functions.

Change-Id: Ib3d7ca513254a117f69924a0f074692b4467447c
Reviewed-by: Ivan Vizir <define-true-false@yandex.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>

3 files changed, 123 insertions, 0 deletions

diff --git a/examples/examples.pro b/examples/examples.pro
new file mode 100644
index 0000000..dce8977
--- /dev/null
+++ b/examples/examples.pro
@@ -0,0 +1,2 @@
+TEMPLATE = subdirs
+SUBDIRS += iconextractor
diff --git a/examples/iconextractor/iconextractor.pro b/examples/iconextractor/iconextractor.pro
new file mode 100644
index 0000000..b9ad5f6
--- /dev/null
+++ b/examples/iconextractor/iconextractor.pro
@@ -0,0 +1,6 @@
+TEMPLATE = app
+TARGET = iconextractor
+CONFIG += console
+QT = core gui winextras
+LIBS += -lshell32
+SOURCES += main.cpp
diff --git a/examples/iconextractor/main.cpp b/examples/iconextractor/main.cpp
new file mode 100644
index 0000000..ea54149
--- /dev/null
+++ b/examples/iconextractor/main.cpp
@@ -0,0 +1,115 @@
+/****************************************************************************
+ **
+ ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+ ** Contact: http://www.qt-project.org/legal
+ **
+ ** This file is part of QtWindowsExtras in the Qt Toolkit.
+ **
+ ** $QT_BEGIN_LICENSE:LGPL$
+ ** Commercial License Usage
+ ** Licensees holding valid commercial Qt licenses may use this file in
+ ** accordance with the commercial license agreement provided with the
+ ** Software or, alternatively, in accordance with the terms contained in
+ ** a written agreement between you and Digia.  For licensing terms and
+ ** conditions see http://qt.digia.com/licensing.  For further information
+ ** use the contact form at http://qt.digia.com/contact-us.
+ **
+ ** GNU Lesser General Public License Usage
+ ** Alternatively, this file may be used under the terms of the GNU Lesser
+ ** General Public License version 2.1 as published by the Free Software
+ ** Foundation and appearing in the file LICENSE.LGPL included in the
+ ** packaging of this file.  Please review the following information to
+ ** ensure the GNU Lesser General Public License version 2.1 requirements
+ ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+ **
+ ** In addition, as a special exception, Digia gives you certain additional
+ ** rights.  These rights are described in the Digia Qt LGPL Exception
+ ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+ **
+ ** GNU General Public License Usage
+ ** Alternatively, this file may be used under the terms of the GNU
+ ** General Public License version 3.0 as published by the Free Software
+ ** Foundation and appearing in the file LICENSE.GPL included in the
+ ** packaging of this file.  Please review the following information to
+ ** ensure the GNU General Public License version 3.0 requirements will be
+ ** met: http://www.gnu.org/copyleft/gpl.html.
+ **
+ **
+ ** $QT_END_LICENSE$
+ **
+ ****************************************************************************/
+
+#include <QtWinFunctions>
+
+#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 = Qt::fromWinHICON(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;
+}