Development/Tutorials/KCmdLineArgs (zh CN)

命令行参数 (仍在不停更新 User:milliams)

教程系列	初始者教程
预备课程	教程四－加载和保存
下一课	Tutorial 6 - ### (TODO User:milliams)
深入阅读	KCmdLineArgs KCmdLineOptions

摘要

我们要有一个文字编辑器，可以用来加载保存文件。我们要让这个编辑器象应用程序一样，用命令行参数来打开文件，甚至在Dolphin里用"以...打开"的方式来打开文件。

代码

main.cpp

```
#include <KApplication>
```
```
#include <KAboutData>
```
```
#include <KCmdLineArgs>
```
```
#include <KUrl> //新加
```
```
 
```
```
#include "mainwindow.h"
```
```
 
```
```
int main (int argc, char *argv[])
```
```
{
```

  KAboutData aboutData( "tutorial5", "tutorial5",

```
      ki18n("Tutorial 5"), "1.0",
```

      ki18n("A simple text area which can load and save."),

```
      KAboutData::License_GPL,
```

      ki18n("Copyright (c) 2007 Developer") );

  KCmdLineArgs::init( argc, argv, &aboutData );

```
 
```
```
  KCmdLineOptions options; //新加
```

  options.add("+[file]", ki18n("Document to open")); //新加

  KCmdLineArgs::addCmdLineOptions(options); //新加

```
 
```
```
  KApplication app;
```
```
 
```

  MainWindow* window = new MainWindow();

```
  window->show();
```
```
 
```

  KCmdLineArgs *args = KCmdLineArgs::parsedArgs(); //新加

```
  if(args->count()) //新加
```
```
  {
```

    window->openFile(args->url(0).url()); //新加

```
  }
```
```
 
```
```
  return app.exec();
```
```
}
```

mainwindow.h

```
#ifndef MAINWINDOW_H
```
```
#define MAINWINDOW_H
```
```
 
```
```
#include <KXmlGuiWindow>
```
```
#include <KTextEdit>
```
```
 
```
```
class MainWindow : public KXmlGuiWindow
```
```
{
```
```
  Q_OBJECT
```
```
 
```
```
  public:
```
```
    MainWindow(QWidget *parent=0);
```

    void openFile(const QString &inputFileName); //新加

```
 
```
```
  private:
```
```
    KTextEdit* textArea;
```
```
    void setupActions();
```
```
    QString fileName;
```
```
 
```
```
  private slots:
```
```
    void newFile();
```
```
    void openFile();
```
```
    void saveFile();
```
```
    void saveFileAs();
```

    void saveFileAs(const QString &outputFileName);

```
};
```
```
 
```
```
#endif
```

mainwindow.cpp

```
#include "mainwindow.h"
```
```
 
```
```
#include <KApplication>
```
```
#include <KAction>
```
```
#include <KLocale>
```
```
#include <KActionCollection>
```
```
#include <KStandardAction>
```
```
#include <KFileDialog>
```
```
#include <KMessageBox>
```
```
#include <KIO/NetAccess>
```
```
#include <KSaveFile>
```
```
#include <QTextStream>
```
```
 
```
```
MainWindow::MainWindow(QWidget *parent)
```
```
    : KXmlGuiWindow(parent),
```
```
      fileName(QString())
```
```
{
```
```
  textArea = new KTextEdit;
```
```
  setCentralWidget(textArea);
```
```
 
```
```
  setupActions();
```
```
}
```
```
 
```
```
void MainWindow::setupActions()
```
```
{
```

  KAction* clearAction = new KAction(this);

```
  clearAction->setText(i18n("Clear"));
```

  clearAction->setIcon(KIcon("document-new"));

  clearAction->setShortcut(Qt::CTRL + Qt::Key_W);

  actionCollection()->addAction("clear", clearAction);

  connect(clearAction, SIGNAL(triggered(bool)),

```
          textArea, SLOT(clear()));
```
```
 
```

  KStandardAction::quit(kapp, SLOT(quit()),

                        actionCollection());

```
 
```

  KStandardAction::open(this, SLOT(openFile()),

                        actionCollection());

```
 
```

  KStandardAction::save(this, SLOT(saveFile()),

                        actionCollection());

```
 
```

  KStandardAction::saveAs(this, SLOT(saveFileAs()),

                        actionCollection());

```
 
```

  KStandardAction::openNew(this, SLOT(newFile()),

                        actionCollection());

```
 
```
```
  setupGUI();
```
```
}
```
```
 
```
```
void MainWindow::newFile()
```
```
{
```
```
  fileName.clear();
```
```
  textArea->clear();
```
```
}
```
```
 
```

void MainWindow::saveFileAs(const QString &outputFileName)

```
{
```
```
  KSaveFile file(outputFileName);
```
```
  file.open();
```
```
 
```
```
  QByteArray outputByteArray;
```

  outputByteArray.append(textArea->toPlainText());

```
  file.write(outputByteArray);
```
```
  file.finalize();
```
```
  file.close();
```
```
 
```
```
  fileName = outputFileName;
```
```
}
```
```
 
```
```
void MainWindow::saveFileAs()
```
```
{
```

  saveFileAs(KFileDialog::getSaveFileName());

```
}
```
```
 
```
```
void MainWindow::saveFile()
```
```
{
```
```
  if(!fileName.isEmpty())
```
```
  {
```
```
    saveFileAs(fileName);
```
```
  }
```
```
  else
```
```
  {
```
```
    saveFileAs();
```
```
  }
```
```
}
```
```
 
```
```
void MainWindow::openFile() //变更
```
```
{
```

  openFile(KFileDialog::getOpenFileName());

```
}
```
```
 
```

void MainWindow::openFile(const QString &inputFileName) //新加

```
{
```
```
  QString tmpFile;
```

  if(KIO::NetAccess::download(inputFileName, tmpFile,

```
         this))
```
```
  {
```
```
    QFile file(tmpFile);
```
```
    file.open(QIODevice::ReadOnly);
```

    textArea->setPlainText(QTextStream(&file).readAll());

```
    fileName = inputFileName;
```
```
 
```

    KIO::NetAccess::removeTempFile(tmpFile);

```
  }
```
```
  else
```
```
  {
```
```
    KMessageBox::error(this, 
```

        KIO::NetAccess::lastErrorString());

```
  }
```
```
}
```

tutorial5ui.rc

```
<?xml version="1.0" encoding="UTF-8"?>
```
```
<gui name="tutorial5"
```
```
     version="1"
```

     xmlns="http://www.kde.org/standards/kxmlgui/1.0"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://www.kde.org/standards/kxmlgui/1.0

                         http://www.kde.org/standards/kxmlgui/1.0/kxmlgui.xsd" >

```
 
```
```
  <MenuBar>
```
```
    <Menu name="file" >
```
```
      <Action name="clear" />
```
```
    </Menu>
```
```
  </MenuBar>
```
```
 
```
```
  <ToolBar name="mainToolBar" >
```
```
    <text>Main Toolbar</text>
```
```
    <Action name="clear" />
```
```
  </ToolBar>
```
```
 
```
```
</gui>
```

这和教程x的ui.rc一样，唯一改掉的就是从教程x现在变成了教程五.

注解

mainwindow.h

这里我们就加了个openFile，它接受一个QString作为参数。

void openFile(const QString &inputFileName);

mainwindow.cpp

没有什么新东西，重新整理一下而已。所有void openFile()里的东西都被移到了void openFile(const QString &inputFileName)里，除了KFileDialog::getOpenFileName()的调用。

这样，如果我们要一个对话框就调用openFile()，如果指导文件名，调用openFile(QString)就可以了。

main.cpp

这里就是KCmdLineArgs产生神奇效应的地方。

构建，安装，运行

CMakeLists.txt

```
project(tutorial5)
```
```
 
```
```
find_package(KDE4 REQUIRED)
```
```
include_directories( ${KDE4_INCLUDES} )
```
```
 
```
```
set(tutorial5_SRCS 
```
```
  main.cpp
```
```
  mainwindow.cpp
```
```
)
```
```
 
```

kde4_add_executable(tutorial5 ${tutorial5_SRCS})

```
 
```

target_link_libraries(tutorial5 ${KDE4_KDEUI_LIBS}

                                ${KDE4_KIO_LIBS})

```
 
```

install(TARGETS tutorial5 DESTINATION ${BIN_INSTALL_DIR})

```
install( FILES tutorial5ui.rc 
```

         DESTINATION  ${DATA_INSTALL_DIR}/tutorial5 )

有了这个文件，这个教程就可以象教程三教程四里的一样运行了。更多信息，详见教程三。

mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$HOME
make install
$HOME/bin/tutorial5

继续

现在你可以继续了 ### (TODO User:milliams)。

Development/Tutorials/KCmdLineArgs (zh CN)

Contents

摘要

代码

main.cpp

mainwindow.h

mainwindow.cpp

tutorial5ui.rc

注解

mainwindow.h

mainwindow.cpp

main.cpp

构建，安装，运行

CMakeLists.txt

继续