Summary

This article discusses using MSI API's MsiGetProperty and MsiSetProperty to get and set properties using InstallScript code.

Synopsis

Getting and setting a property is done using the MSI API's MsiGetProperty and MsiSetProperty. The following example will explain how to use these APIs in the case of an immediate custom action.

Discussion

The following code sample demonstrates how to use the MsiGetProperty and MsiSetProperty InstallScript functions:

function GetAndSetProperty(hMSI)
NUMBER nvSize, nReturnValue;
STRING svValue;
begin
nvSize = MAX_PATH;
if( MsiSetProperty(hMSI, "TESTPROP", "Test Value") == ERROR_SUCCESS ) then
if ( MsiGetProperty(hMSI, "TESTPROP", svValue, nvSize) == ERROR_SUCCESS ) then
SprintfBox(INFORMATION, "TESTPROP Value", "TESTPROP = %s", svValue);
endif;
endif;
end;

NOTE: When getting or setting a property from an InstallScript Event, such as OnFirstUiAfter, use the InstallScript variable ISMSI_HANDLE instead of hMSI.

Additional Information

For more information on MsiGetProperty and MsiSetProperty, see the following Microsoft Learn help topics:

• MsiGetPropertyA function (msiquery.h)
• MsiSetPropertyA function (msiquery.h)

For more information on ISMSI_HANDLE and hMSI, see the following topics in the InstallShield Help Library:

• Writing Entry-Point Functions
• ISMSI_HANDLE