shlxtmsi.hxx

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#ifndef INCLUDED_SETUP_NATIVE_SOURCE_WIN32_CUSTOMACTIONS_SHELLEXTENSIONS_SHLXTMSI_HXX
#define INCLUDED_SETUP_NATIVE_SOURCE_WIN32_CUSTOMACTIONS_SHELLEXTENSIONS_SHLXTMSI_HXX
 
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <msiquery.h>
 
#include <string>
 
static inline std::wstring GetMsiPropertyW( MSIHANDLE handle, const std::wstring& sProperty )
{
    std::wstring   result;
    WCHAR szDummy[1] = L"";
    DWORD nChars = 0;
 
    if ( MsiGetPropertyW( handle, sProperty.c_str(), szDummy, &nChars ) == ERROR_MORE_DATA )
    {
        DWORD nBytes = ++nChars * sizeof(WCHAR);
        PWSTR buffer = static_cast<PWSTR>(_alloca(nBytes));
        ZeroMemory( buffer, nBytes );
        MsiGetPropertyW( handle, sProperty.c_str(), buffer, &nChars );
        result = buffer;
    }
 
    return  result;
}
 
static inline void SetMsiPropertyW( MSIHANDLE handle, const std::wstring& sProperty, const std::wstring& sValue )
{
    MsiSetPropertyW( handle, sProperty.c_str(), sValue.c_str() );
}
 
static inline void UnsetMsiPropertyW( MSIHANDLE handle, const std::wstring& sProperty )
{
    MsiSetPropertyW( handle, sProperty.c_str(), nullptr );
}
 
#endif // INCLUDED_SETUP_NATIVE_SOURCE_WIN32_CUSTOMACTIONS_SHELLEXTENSIONS_SHLXTMSI_HXX
 
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