qt： qt install framework使用问题；

qt提供了qt install framework用于程序打包，方便、快捷，并且可以对界面和功能进行自定义。

但是， 如果使用默认的打包配置，不进行安装页面功能自定义的话， 在修改安装路径时，在对程序进行卸载的时候，会将安装路径下的所有文件

全部删除。 那么，这就会导致一个问题： 如果用户修改了安装路径，没有新建文件夹用来安装，而是直接安装在了D:\目录下，在卸载的时候，会将

D:\下的所有文件全部清除掉。很操蛋的操作！

参考： https://stackoverflow.com/questions/46455360/workaround-for-qt-installer-framework-not-overwriting-existing-installation?r=SearchResults1、

这里采用自定义界面和功能的方式来解决该问题：

1、安装路径设置页面

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>TargetWidget</class>
 <widget class="QWidget" name="TargetWidget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>491</width>
    <height>190</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="minimumSize">
   <size>
    <width>491</width>
    <height>190</height>
   </size>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <widget class="QLabel" name="description">
     <property name="text">
      <string/>
     </property>
    </widget>
   </item>
   <item>
    <layout class="QHBoxLayout" name="horizontalLayout">
     <item>
      <widget class="QLineEdit" name="targetDirectory">
       <property name="readOnly">
        <bool>true</bool>
       </property>
      </widget>
     </item>
     <item>
      <widget class="QToolButton" name="targetChooser">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="minimumSize">
        <size>
         <width>0</width>
         <height>0</height>
        </size>
       </property>
       <property name="text">
        <string>...</string>
       </property>
      </widget>
     </item>
    </layout>
   </item>
   <item>
    <layout class="QHBoxLayout" name="horizontalLayout_2">
     <property name="topMargin">
      <number>0</number>
     </property>
     <item>
      <widget class="QLabel" name="warning">
       <property name="enabled">
        <bool>true</bool>
       </property>
       <property name="text">
        <string>TextLabel</string>
       </property>
      </widget>
     </item>
     <item>
      <spacer name="horizontalSpacer">
       <property name="orientation">
        <enum>Qt::Horizontal</enum>
       </property>
       <property name="sizeHint" stdset="0">
        <size>
         <width>40</width>
         <height>20</height>
        </size>
       </property>
      </spacer>
     </item>
    </layout>
   </item>
   <item>
    <spacer name="verticalSpacer">
     <property name="orientation">
      <enum>Qt::Vertical</enum>
     </property>
     <property name="sizeHint" stdset="0">
      <size>
       <width>20</width>
       <height>122</height>
      </size>
     </property>
    </spacer>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

2、脚本

var targetDirectoryPage = null;

function Component()
{
    installer.gainAdminRights();
    component.loaded.connect(this, this.installerLoaded);
}

Component.prototype.createOperations = function()
{
    // Add the desktop and start menu shortcuts.
    component.createOperations();
    component.addOperation("CreateShortcut",
                           "@TargetDir@/Atlas4500Tuner.exe",
                           "@DesktopDir@/Atlas4500 Tuner.lnk",
                           "workingDirectory=@TargetDir@");

    component.addOperation("CreateShortcut",
                           "@TargetDir@/Atlas4500Tuner.exe",
                           "@StartMenuDir@/Atlas4500 Tuner.lnk",
                           "workingDirectory=@TargetDir@");
}

Component.prototype.installerLoaded = function()
{
    installer.setDefaultPageVisible(QInstaller.TargetDirectory, false);
    installer.addWizardPage(component, "TargetWidget", QInstaller.TargetDirectory);

    targetDirectoryPage = gui.pageWidgetByObjectName("DynamicTargetWidget");
    targetDirectoryPage.windowTitle = "Choose Installation Directory";
    targetDirectoryPage.description.setText("Please select where the Atlas4500 Tuner will be installed:");
    targetDirectoryPage.targetDirectory.textChanged.connect(this, this.targetDirectoryChanged);
    targetDirectoryPage.targetDirectory.setText(installer.value("TargetDir"));
    targetDirectoryPage.targetChooser.released.connect(this, this.targetChooserClicked);

    gui.pageById(QInstaller.ComponentSelection).entered.connect(this, this.componentSelectionPageEntered);
}

Component.prototype.targetChooserClicked = function()
{
    var dir = QFileDialog.getExistingDirectory("", targetDirectoryPage.targetDirectory.text);
    targetDirectoryPage.targetDirectory.setText(dir);
}

Component.prototype.targetDirectoryChanged = function()
{
    var dir = targetDirectoryPage.targetDirectory.text;
    if (installer.fileExists(dir) && installer.fileExists(dir + "/maintenancetool.exe")) {
        targetDirectoryPage.warning.setText("<p style=\"color: red\">Existing installation detected and will be overwritten.</p>");
    }
    else if (installer.fileExists(dir)) {
        targetDirectoryPage.warning.setText("<p style=\"color: red\">Installing in existing directory. It will be wiped on uninstallation.</p>");
    }
    else {
        targetDirectoryPage.warning.setText("");
    }
    installer.setValue("TargetDir", dir);
}

Component.prototype.componentSelectionPageEntered = function()
{
    var dir = installer.value("TargetDir");
    if (installer.fileExists(dir) && installer.fileExists(dir + "/maintenancetool.exe")) {
        installer.execute(dir + "/maintenancetool.exe", "--script=" + dir + "/scripts/auto_uninstall.qs");
    }
}

　　3、覆盖安装

var targetDirectoryPage = null;

function Component()
{
    installer.gainAdminRights();
    component.loaded.connect(this, this.installerLoaded);
}

Component.prototype.createOperations = function()
{
    // Add the desktop and start menu shortcuts.
    component.createOperations();
    component.addOperation("CreateShortcut",
                           "@TargetDir@/Atlas4500Tuner.exe",
                           "@DesktopDir@/Atlas4500 Tuner.lnk",
                           "workingDirectory=@TargetDir@");

    component.addOperation("CreateShortcut",
                           "@TargetDir@/Atlas4500Tuner.exe",
                           "@StartMenuDir@/Atlas4500 Tuner.lnk",
                           "workingDirectory=@TargetDir@");
}

Component.prototype.installerLoaded = function()
{
    installer.setDefaultPageVisible(QInstaller.TargetDirectory, false);
    installer.addWizardPage(component, "TargetWidget", QInstaller.TargetDirectory);

    targetDirectoryPage = gui.pageWidgetByObjectName("DynamicTargetWidget");
    targetDirectoryPage.windowTitle = "Choose Installation Directory";
    targetDirectoryPage.description.setText("Please select where the Atlas4500 Tuner will be installed:");
    targetDirectoryPage.targetDirectory.textChanged.connect(this, this.targetDirectoryChanged);
    targetDirectoryPage.targetDirectory.setText(installer.value("TargetDir"));
    targetDirectoryPage.targetChooser.released.connect(this, this.targetChooserClicked);

    gui.pageById(QInstaller.ComponentSelection).entered.connect(this, this.componentSelectionPageEntered);
}

Component.prototype.targetChooserClicked = function()
{
    var dir = QFileDialog.getExistingDirectory("", targetDirectoryPage.targetDirectory.text);
    targetDirectoryPage.targetDirectory.setText(dir);
}

Component.prototype.targetDirectoryChanged = function()
{
    var dir = targetDirectoryPage.targetDirectory.text;
    if (installer.fileExists(dir) && installer.fileExists(dir + "/maintenancetool.exe")) {
        targetDirectoryPage.warning.setText("<p style=\"color: red\">Existing installation detected and will be overwritten.</p>");
    }
    else if (installer.fileExists(dir)) {
        targetDirectoryPage.warning.setText("<p style=\"color: red\">Installing in existing directory. It will be wiped on uninstallation.</p>");
    }
    else {
        targetDirectoryPage.warning.setText("");
    }
    installer.setValue("TargetDir", dir);
}

Component.prototype.componentSelectionPageEntered = function()
{
    var dir = installer.value("TargetDir");
    if (installer.fileExists(dir) && installer.fileExists(dir + "/maintenancetool.exe")) {
        installer.execute(dir + "/maintenancetool.exe", "--script=" + dir + "/scripts/auto_uninstall.qs");
    }
}

　　4、翻译

在脚本中的文字，可以通过qsTr函数进行标记；

利用

lupdate installscript.qs  targetWidget.ui -ts [语言].ts

生成ts文件，然后使用linguist进行翻译生成qm文件；