Finally solved this strange problem

Source: Internet
Author: User

Enable or disable MDI againProgramThe sub-window of will have an exception, and then it will be interrupted:
Inline _ variant_t: _ variant_t (idispatch * psrc, bool faddref) Throw ()
{
V_vt (this) = vt_dispatch;
V_dispatch (this) = psrc;
// Need the addref () as variantclear () CILS release (), unless faddref
// False indicates we're taking ownership
//
If (faddref ){
V_dispatch (this)-> addref (); -------- this line.
}
}

In addition, the value of faddref is 1. At first, I thought it was not released or closed when the frmae promoter was started. Finally, I tried to track and debug it and asked for a problem, the final culprit was my own encapsulated database class, which was not called in the constructor: coinitialize (null), but called: couninitialize () in the destructor () no wonder this will happen .. Careless.

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