SAMZCN wrote: So I am not sure which macro I should set in the preprocessor definition setting. My 64 bit projects have _WIN64 defined in the preprocessor definitions. Btw... you are correct... when you copied the project settings it should have been automatically updated by Visual Studio. Best Wishes, -David Delaune

Hi Mark. Thanks. Appreciated for your share. It really helps me understand IOCP and other asnc IO operation.:thumbsup:

Include all the STL head files which are shared by the DLL and the client proj. And all the data structure of the DLL proj and all the data struct will be used by the cilent proj too. I'm trying ...

ooh...okey. Now it seems a problem for me. :( Originally, I think the view instance is not the same one in spite of same type of view. So the CMFCToolBarComboBoxButton control object is also created onece for each view. Only the ID is the same. The click/change message for the control may be routed to different target view. I think only the control box which is clicked actually should changed. Whatever, any way to make it happen? I really donot want to use CComboBox control to implement. it is not a easy way to do. In that case, you need to control the the box by yourself completely, including its possition and behave.