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>>>>You know there is a setting in Windows display options called "Show window contents while dragging" - this shows the window's contents when you move or resize the window, dynamically resizing the contents if necessary. Is there a way to switch that off from VFP or, at least, tell my VFP app to ignore that setting. When this setting is off only the border of the window is moved or resized and once the operation is complete only then does the window contents refresh.


I have found a link which describes an API which you can call and use to adjust any Windows Control Panel settings called SystemParametersInfo(). Links here:

http://support.microsoft.com/kb/97142

and:

http://msdn.microsoft.com/en-us/library/windows/desktop/ms724947%28v=vs.85%29.aspx#Icon

You can use this API to also switch on/off the "Show Window Contents While Dragging" setting which is constant:

SPI_SETDRAGFULLWINDOWS = 0x0025,

The function definition in C++ is:

BOOL WINAPI SystemParametersInfo(
  _In_     UINT uiAction,
  _In_     UINT uiParam,
  _Inout_  PVOID pvParam,
  _In_     UINT fWinIni
);

In Visual Basic it is:

Declare Function SystemParametersInfo Lib "User" (
ByVal uAction As Integer, 
ByVal uparam As Integer, 
lpvParam As Any, 
ByVal fuWinIni As Integer) As Integer

Anyone with knowledge on how to work this in VFP to switch off the window contents dragging feature?