We offen need to store some binary data in the mdb database, thus we have to transefer the data by VARIANT structure.But how to read from binary data from VARIANT or write to? Here is a solution by safe array of VARRIANT.

Here are some tips of Microsoft Visual Studio 6.0. Display the LastError’s value When we want to get the LastError message, we often using the following code. LPVOID lpMsgBuf; FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language (LPTSTR) &lpMsgBuf, 0, NULL ); // Process any inserts in lpMsgBuf. // … [...]