Hide Text based on RegistrySearch in WiX Bundle - wix

Question

Is it possible to use a RegistrySearch in WiX bundle to hide a Text in theme?
I don't have a clue about where to start. In the code below, the InstalledDotNet4 variable doesn't set the Text in time to disabled and I can't find a way to disable the Text (or change its text content).
Bundle.wxs:
<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"
xmlns:bal="http://schemas.microsoft.com/wix/BalExtension">
<Bundle Name="My App" Version="1.0.0.0"
Manufacturer="ACME"
UpgradeCode="d88faa97-2197-4154-9e77-32f9ca773bd4">
<BootstrapperApplicationRef
Id="WixExtendedBootstrapperApplication.HyperlinkLicense">
<Payload SourceFile="Resources/background.png" Id="myLogo" />
</BootstrapperApplicationRef>
<WixVariable Id="WixExtbaLicenseUrl" Value="" />
<WixVariable Id="WixExtbaThemeXml" Value="Resources\MyTheme.xml" />
<WixVariable Id="WixExtbaThemeWxl" Value="Resources\MyTheme.wxl" />
<util:RegistrySearch Root="HKCU"
Key="Software\AnythingToCheck"
Value="Test" Variable="InstalledDotNet4" />
<Chain>
<MsiPackage Id="dotNETv4" DisplayName="My .NET v4 prerequisite"
SourceFile="myApp.msi"
Visible="yes"
InstallCondition="CheckboxDotNetv4" />
</Chain>
</Wix>
MyTheme.xml:
<?xml version="1.0" encoding="utf-8"?>
<Theme xmlns="http://wixtoolset.org/schemas/thmutil/2010">
<!-- Window definition -->
<!-- Font definition -->
<Page Name="Install">
<Checkbox Name="CheckboxDotNet4"
X="205" Y="126"
Width="-100" Height="17"
TabStop="yes" FontId="3"
HideWhenDisabled="yes">.NET Framework 4.0</Checkbox>
<Text Name="InstalledDotNet4"
X="-10" Y="126"
Width="80" Height="17"
TabStop="no" FontId="3"
HideWhenDisabled="yes">(Installed)</Text>
</Page>
<!-- More pages -->
</Theme>
Additionally, I tried to use the following code in Bundle.wxs, but that is not linked to the RegistrySearch:
<Variable Name="InstalledDotNet4State" Type="string" Value="disable" />

Answer 1

Yes, after extensive research I found it is possible to hide the Text based on a RegistrySearch. First you need to download the WiX Extended Bootstrapper Application from http://wixextba.codeplex.com/. Extract the contents and add to your project the WixBalExtensionExt.dll as shown in Bundle10.wxs example.
Then, open the project bafunctions under folder Template bafunctions. You will need to compile this C++ library and add it to your bundle as a Payload (use the Bundle10.wxs as example).
Then, to be able to read and hide the Text control, uncomment function OnDetectComplete() and add the following code, for example:
STDMETHODIMP OnDetectComplete()
{
HRESULT hr = S_OK;
LPWSTR sczValue = NULL;
#if DEBUG
// Show log info during debug.
// May not be THE way to log.
size_t i;
LPSTR sczValue2 = (char *) malloc(100);
#endif
BalGetStringVariable(L"InstalledDotNet4Reg", &sczValue);
BalExitOnFailure(hr, "Failed to get variable.");
if (sczValue == NULL)
{
BalLog(BOOTSTRAPPER_LOG_LEVEL_STANDARD,
"Failed to read null variable.");
}
else
{
if (_wtoi(sczValue))
{
hr = m_pEngine->SetVariableString(L"CheckboxDotNetv4State",
L"disable");
BalExitOnFailure(hr, "Failed to set control state.");
hr = m_pEngine->SetVariableNumeric(L"CheckboxDotNetv4", 0);
BalExitOnFailure(hr, "Failed to set variable.");
}
else
{
#if DEBUG
// Log information
wcstombs_s(&i, sczValue2, (size_t)100, sczValue, (size_t)100);
BalLog(BOOTSTRAPPER_LOG_LEVEL_STANDARD, sczValue2);
#endif
hr = m_pEngine->SetVariableString(L"InstalledDotNet4State",
L"disable");
BalExitOnFailure(hr, "Failed to set control state.");
}
}
LExit:
ReleaseStr(sczValue);
return hr;
}
Finally, change (or add) your RegistrySearch, this way:
<util:RegistrySearch Root="HKLM"
Key="SOFTWARE\Classes\Installer\Products\FCDAC0A0AD874C333A05DC1548B97920"
Variable="InstalledDotNet4Reg" Result="exists" />