how to transparent MFC activeX control

[B0606115]

hi! i have made a dialog based(windowed) mfc activex control ,i want to make it transparent and again retain the previous state according to user choice.kindly help me. thanx in advance

[Member 3480232]

What do you mean make it transparent?

[B0606115]

To make it transparent means to hide the dialog when required and unhide it(show it back)as required.

[Member 3480232]

The way to do this is to use: ::ShowWindow( SW_HIDE or SW_SHOW ) Usually one would add a method to the control as: BOOL LogonDlg::SetVisibility( int nCmd ) {       BOOL bRet = ShowWindow( nCmd );       if( nCmd == SW_SHOW )      SetForegroundWindow();       return bRet; }

[B0606115]

::ShowWindow( SW_HIDE or SW_SHOW ) hides and show the control not the dialog. please tell me how to do it for a dialog. if u have done it by ::ShowWindow( SW_HIDE or SW_SHOW ) then kindly tell the detailed code of it.

[Member 3480232]

The ShowWindow API can be used inside any dialog. There is no more to it than just that. It is usually made a part of a method which also includes the SetForegroundWindow but that is all. Experiment with it. Its the only way to become familiar with something. As for the theory: A modeless dialog is a window that has no exclusive rights to system resources such as the cursor. It can remain on the desktop in a hidden state while the rest of the control is active and busy with other things and can be hidden and brought to the foreground at will. I think that in your case the control is only a dialog and that is why you perceive the control to be hidden and shown. That is not true. The control cannot be hidden because running code does not subscribe to the concept of being hidden etc. Only a GUI element can go through these states and that is what ShowWindow is designed for.