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installshieldinstallscript

Updating the INSTALLDIR from Installscript in Basic MSI

I want to change the INSTALLDIR value for my Installer during Installation using Installscript. How should I do it? I have already tried the following: Created a custom action as:

function InitializeValues(hMSI)
    STRING svProductName; 
    STRING svInstallDir;  
    NUMBER nvSize;
begin                        
    nvSize=255; 
    MsiGetProperty (hMSI, "ProductName", svProductName, nvSize);  
    if(svProductName = "Notepad Pro") then  
         svInstallDir = PROGRAMFILES ^ svProductName;
 //     MsiSetTargetPath(hMSI,INSTALLDIR,svInstallDir);      
        MsiSetProperty(hMSI,INSTALLDIR,svInstallDir);
        MessageBox(INSTALLDIR,INFORMATION);
    endif;
end;

My custom action gets executed but the value of INSTALLDIR does not changes. I have scheduled my custom action in UI Sequence before Cost Finalize and in Execute Sequence After Cost Finalize.

Please help.

Solution

  • In both InstallUISequence and InstallExecuteSequence the custom action should run before CostFinalize. Also, MsiSetProperty is not used that way and I don't think it will work in InstallScript.

    You can try using:

    INSTALLDIR = svInstallDir

    or

    MsiSetProperty(hMSI, "INSTALLDIR", svInstallDir);