Custom action DLL for Windows Installer

[act_x]

I am trying to invoke a Win32 DLL from the Windows Installer to perform certain custom actions. For this purpose I have exposed 1 API

MY_DLL_API UINT MyCustomActionLaunch(MSIHANDLE hMsiModule)
{

MessageBoxW (NULL, L"MyCustomAction launch", L"MyCustomAction", MB\_OK);	
WCHAR msg \[500\] = {0};
WCHAR vbuff \[1024\] = {0};
DWORD vlen = 1024;
UINT gp = MsiGetPropertyW(hMsiModule, L"ProgramFilesFolder", vbuff, &vlen);

**if(gp == ERROR\_SUCCESS )
{
	 if (wcslen(vbuff) <= 0)
	 {
		 MessageBoxW(NULL , L"Zero Bytes",L"MyCustomAction" , MB\_OK);		 }
	
	MessageBoxW(NULL, vbuff, L"MyCustomAction", MB\_OK);    		

}**	else
{
	MessageBoxW (NULL, L"Failure", L"MyCustomAction", MB\_OK);

}

return -1;

}

I find that no bytes are being copied, where I am querying for a standard property . This DLL is being developed in VC6. Does anyone see anything wrong here ?

Engineering is the effort !