WiX - 如果注册表搜索失败,如何安装到备用路径

Question

我的程序应该安装到注册表中记录的路径.如果找不到注册表项,则安装到另一个(默认)路径.

例如,我想要有类似的东西:

<Property Id="MYINSTALLDIR">
    <RegistrySearch Id='MyRegistry' Type='raw' Root='HKCU' Key='Software\MyApp\Foo' Name='InstallDir' />
    if not found, then set "MYINSTALLDIR" to "D:\working\defaultApps"
</Property>    

我该如何编写我的wxs文件来实现这一目标？

编辑:

现在的问题是:

if not found in registry, then set "MYINSTALLDIR" to LocalAppDataFolder 

我试过了

<Property Id="MYINSTALLDIR" Value="LocalAppDataFolder">
    <RegistrySearch Id='MyRegistry' Type='raw' Root='HKCU' Key='Software\MyApp\Foo' Name='InstallDir' />
</Property>

但错误返回:

Error 1606. Could not access network location LocalAppDataFolder.

Answer 1

好的,我终于弄清楚该怎么做了.

使用Custom Action,现在可以将默认值设置为另一个属性:

<Property Id="MYINSTALLDIR">
    <RegistrySearch Id='MyRegistry' Type='raw' Root='HKCU' Key='Software\MyApp\Foo' Name='InstallDir' />
</Property>

<CustomAction Id="UserInstallDir" Property="InstallDir" Value="[INSTALLDIRCU]" Execute="immediate" />
<CustomAction Id="UserInstallDirDefault" Property="InstallDir" Value="[LocalAppDataFolder]" Execute="immediate" />

<InstallExecuteSequence>
    <Custom Action="UserInstallDir" After="AppSearch">MYINSTALLDIR</Custom>      
    <Custom Action="UserInstallDirDefault" After="AppSearch">NOT MYINSTALLDIR</Custom>      
</InstallExecuteSequence>