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CHAPTER 9 CLICKONCE TOOLS AND SCENARIOS
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the installer during installation (for example, if the installer has to create temporary files). In this case, the installer did not require a reboot, and the entire package is only about 85KB. Therefore, it might take about three seconds, and its install size and installation requirements are about 100KB. Next, ensure that the install file you added in the previous section is selected in the tree control, and then click the System Checks tab. The System Checks tab provides UIs for the various checks discussed in the previous chapter (see Figure 9-6).
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Figure 9-6. System Checks tab You can select the type of check by clicking a toolbar button on the System Checks tab. Each button displays the corresponding screen for the selected check. The application supports the following checks: File Check, Registry Check, Registry File Check, MSI Product Check, External Check, and GAC Check. In this example, you ll check for the existence of a registry key. Specifically, you are interested in the string value of the following: HKEY_LOCAL_MACHINE\SOFTWARE\ACoolSample\ SaySomething. To create this check, click the Registry Check button on the toolbar. In the Registry Check screen, give the Property for Result field the name ACoolKey. Recall that when you did this manually, you created a registry check in the product.xml file that looked like this: <RegistryCheck Property="ACoolKey" Key="HKLM\Software\ACoolSample" Value="SaySomething" />
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CHAPTER 9 CLICKONCE TOOLS AND SCENARIOS
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ACoolKey creates a property that refers to the registry key HMLM\Software\ACoolSample, which has a string value of SaySomething. To create the same check via the UI, name the property ACoolKey, and use HMLM\Software\ACoolSample for the registry key. To pull the value from the string value SaySomething, use SaySomething for the registry value. Note that when the check is performed by the bootstrapper at install time, the value of the check is put into the property ACoolKey. Next you need to configure the install conditions for the prerequisite package. Recall that when you did this in the previous chapter, you set up the following install conditions: <InstallConditions> <BypassIf Property="ACoolKey" Compare="ValueExists"/> <!-- Block install if user does not have admin privileges --> <FailIf Property="Version9x" Compare="ValueExists" String="InvalidPlatform"/> <FailIf Property="VersionNT" Compare="VersionLessThan" Value="5.0.4" String="InvalidPlatform2K"/> <FailIf Property="AdminUser" Compare="ValueEqualTo" Value="false" String="AdminRequired"/> </InstallConditions> You have four install conditions. You want to bypass installation of the prerequisite package if the registry entry exists and want to fail if you don t have an administrator running the installer or a nonsupported version of the operating system. To configure the same thing using the BMG, select Install Conditions; you should see a screen that looks similar to Figure 9-7.
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Figure 9-7. Configuring install conditions with the BMG
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CHAPTER 9 CLICKONCE TOOLS AND SCENARIOS
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The BMG shines here because it makes configuring installation conditions easy. You select the type of condition, choose from a selected list of properties, select from a list of compare values (such as less than or equal to), provide an optional value (in cases where it makes sense), and then provide a message. Note that the first condition you check is to see whether the registry entry exists. Not surprisingly, when you named the property ACoolKey on the System Checks tab, the property shows up in the drop-down list in the Installation Conditions tab. Next, you need to configure exit codes for the prerequisite package. Make sure the install file is selected in the tree control, and then choose the Exit Codes tab. Recall that in the previous chapter, you configured the following exit codes: <ExitCodes> <ExitCode Value="0" Result="Success"/> <DefaultExitCode Result="Fail" FormatMessageFromSystem="true" String="GeneralFailure"/> </ExitCodes> You configured only a success exit code and a failure exit code. You can do the same using the BMG s Exit Codes tab. As shown in Figure 9-8, you can configure the exit code 0 to indicate a success and then use a default system exit code for failure.
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Figure 9-8. Configuring exit codes with the BMG The BMG tool also allows you to add files that may be required by your prerequisite package (such as a CAB file) using the Additional Files tab. You can configure the bootstrapper to run security validations on the install file prior to running the installer. You do this via the Security tab. Figure 9-9 shows both the Additional Files and Security tabs.
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