WiX Custom Action 的deferred !

WiX  Custom Action  的deferred !

当使用Custom Action 时，时常会需要按照一定的顺序去执行相应的Custom Action，这时需要使Execute="deferred"    然而在执行相应的脚本时，去获取相应的session时却会为空或不存在。

例如：

<?xml version="1.0" encoding="UTF-8"?>

<Wix xmlns="http://schemas.microsoft.com/wix/2003/01/wi">

  <Product Id="{94A35E02-D48F-48F1-AC1A-23F62489BBF4}"

            Name="Minimal Windows Installer Sample"

            Language="1033"

            Codepage="1252"

            Version="1.0.0"

            Manufacturer="Acme Corporation"

            UpgradeCode="{74069BA4-1D1C-4252-A074-B2EC0C746403}">

     <Package Id="{4C159FD5-135E-42DE-B36E-22DDDCBA3DCF}"

              Description="Minimal Windows Installer Sample"

              Comments="This installer database contains the logic and data required to install [ProductName]."

              InstallerVersion="200"

              Languages="1033"

              SummaryCodepage="1252"

              Platforms="Intel"

              ReadOnly="no"

              Compressed="yes"

              AdminImage="no"

              Keywords="Installer"

              ShortNames ="no"

              Manufacturer="Acme Corporation" />

     <Media Id="1" Cabinet="CAB001.cab" EmbedCab="yes" />

     <Directory Id="TARGETDIR" Name="SourceDir">

       <Directory Id="ProgramFilesFolder">

         <Directory Id="INSTALLDIR" Name="Minimal" LongName="MinimalInstallation">

           <Component Id="Component1"

                      Guid="{A77C5B06-132D-4884-8E17-EA10A83C812D}">

             <File Id="ReadMe" DiskId="1" Name="Readme.txt" Source="Readme.txt" Vital="yes" KeyPath="yes" />

           </Component>

         </Directory>

       </Directory>

     </Directory>

     <Property Id="TESTPROPERTY" Value="Hello" />

     <CustomAction Id="ShowProperty" Script="vbscript" Execute="deferred">

       <![CDATA[

       MsgBox Session.Property("TESTPROPERTY")

       ]]>

     </CustomAction>

     <InstallExecuteSequence>

       <Custom Action="ShowProperty" Before="InstallFinalize">Not Installed</Custom>

     </InstallExecuteSequence>

     <Feature Id="Feature1"

              Title="Feature1 title"

              Description="Feature1 description"

              Level="1"

              ConfigurableDirectory="INSTALLDIR" >

       <ComponentRef Id="Component1" />

     </Feature>

  </Product>

</Wix>

执行后会发现弹出的对话框为空。而如果使用Execute="immediate"（缺省设置）时会发现会弹出相应的目录。

这是因为延迟方式的Custom Action 在获取相应的session时，session已经销毁了，

则延迟方式的Custom Action 只能使用以下三种property：

ProductCode
UserSID
CustomActionData

使用customActionData方式（即先将需要的property保存）：

<Property Id="TESTPROPERTY" Value="Hello" />

     <CustomAction Id="ShowProperty" Script="vbscript" Execute="deferred">

       <![CDATA[

       MsgBox Session.Property("CustomActionData")

       ]]>

     </CustomAction>

     <CustomAction Id="SetPropertyForShowProperty"

                   Property="ShowProperty" Value="[TESTPROPERTY]" />

     <InstallExecuteSequence>

       <Custom Action="SetPropertyForShowProperty" Before="InstallInitialize">Not Installed</Custom>

       <Custom Action="ShowProperty" Before="InstallFinalize">Not Installed</Custom>

     </InstallExecuteSequence>

如需要多个property：

<Property Id="TESTPROPERTY" Value="Hello" />

     <Property Id="TESTPROPERTY2" Value="World" />

     <CustomAction Id="ShowProperty" Script="vbscript" Execute="deferred">

       <![CDATA[

       Dim properties

       properties = Split(Session.Property("CustomActionData"), ";", -1, 1)

       MsgBox properties(0) & ", " & properties(1) & "!"

       ]]>

     </CustomAction>

     <CustomAction Id="SetPropertyForShowProperty"

                   Property="ShowProperty"

                   Value="[TESTPROPERTY];[TESTPROPERTY2]" />

     <InstallExecuteSequence>

       <Custom Action="SetPropertyForShowProperty" Before="InstallInitialize">Not Installed</Custom>

       <Custom Action="ShowProperty" Before="InstallFinalize">Not Installed</Custom>

     </InstallExecuteSequence>