Drag&Drop related issue. Drag files from 32bit tc into 6

[xred2015]

How to test:
1. Compile a MFC app by VS 2013 (or above?) with x64
2. Enable drag&drop features of this app
3. Drag files from 32 bit TC into app
4. Failed. Windows Explorer works very well.

Then, I looked into my app and found hDropInfo became into an invalid handle.

Code: Select all

UINT cnt = ::DragQueryFile(hDropInfo, (UINT)-1, NULL, NULL);

64bit TC don't have this issue.

BTW, TC and app both work as normal user.(Non-administrator)

EDITED: If this app was compiled by VS 2008, 32bit&64bit TC both work.

[ghisler(Author)]

Hmm, no idea - maybe you need to make a copy of the data in the WM_DROPFILES message handler if you want to use it outside.