windows-server-2003/base/win32/fusion/tests/sxstest/sxstest_formatguid.cpp

void FormatGuid(WCHAR* String, SIZE_T StringSize, const GUID& Guid)
{
    if (StringSize > 0)
    {
        _snwprintf(
            String,
            StringSize,
            L"%08lx-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
            Guid.Data1,
            Guid.Data2,
            Guid.Data3,
            Guid.Data4[0], Guid.Data4[1], Guid.Data4[2], Guid.Data4[3],
            Guid.Data4[4], Guid.Data4[5], Guid.Data4[6], Guid.Data4[7]);
        String[StringSize - 1] = 0;
    }
}