Summary

Synopsis

This article discusses how to uninstall an InstallScript-based project, you must know the setup?s globally unique identifier (GUID), which is used as the name of the uninstallation registry key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\<GUID>.

Retrieve the value of the product?s uninstallation string, UninstallString, from the key listed above. Parse this value to find the path to Setup.exe. After parsing the string, pass the path to Setup.exe in the szProgram parameter of LaunchAppAndWait.

Below is an example of the steps above. To use this in your script, change the product GUID to one that matches the setup you wish to uninstall.

Discussion

function UninstallSetup()

STRING szKey, svNumValue, szUninstValue, firststring, svString, secondstring;
NUMBER nvSize, nType, nResult, numResult;
LIST listID;

begin
nType = REGDB_NUMBER;
szUninstValue = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\{E2320DC5-B30D-11D3-8871-00104BD34E2B}";
RegDBSetDefaultRoot(HKEY_LOCAL_MACHINE);

// Retrieve the uninstallation string.
if (RegDBGetKeyValueEx(szUninstValue, "UninstallString", nType, svNumValue, nvSize) < 0) then
MessageBox("RegDBGetKeyValueEx failed.", SEVERE);
endif;

listID = ListCreate ( STRINGLIST );
StrGetTokens ( listID , svNumValue , "\"" );
nResult = ListGetFirstString (listID, svString);
firststring = svString;

// Loop while list items continue to be retrieved.
while (nResult != END_OF_LIST)

// Display the current element.
MessageBox (svString, INFORMATION);

// Get the next string in the list.
nResult = ListGetNextString (listID, svString);
numResult = StrFind ( svString , "setup.exe" );
if (numResult > 0)then
secondstring = svString;
endif;
endwhile;

LongPathToQuote ( secondstring , TRUE );
if (LaunchAppAndWait (secondstring, "", WAIT) < 0) then
MessageBox("Failed to Remove the Application", SEVERE);
endif;
end;

Additional Information

For more information on the methods used to launch applications, see the InstallShield Help Library topics:

LaunchAppAndWait

LaunchApplication