The first parameter is OK for the integer.

? 1795698358 > 2^32

>>Did you check parameter values at the time of error? Are you using the latest version of the components?
>
>Thanks Sergey for the response. I haven't troubled you for quite some with my issues :)
>
>The parameters comes up as follows for 4 calls when the app starts
>
>The parameters as in the VFP IDE (no errors)
>Call 1: 4411862, 2034914, 528, 1, 1903924
>Call 2: 4411862, 2034914, 528, 2, 1903924
>Call 3: 4411862, 2034914, 528, 1, 1510274
>Call 4: 4411862, 2034914, 528, 2, 1510274
>
>The parameters as in the EXE (error generated)
>Call 1: 1795698358, 2559284, 528, 1, 2165986
>Call 2: 1795698358, 2559284, 528, 2, 2165986
>Call 3: 1795698358, 2559284, 528, 1, 30383264
>Call 4: 1795698358, 2559284, 528, 2, 30383264
>
>I may be wrong but is the 1st parameter value too big for an Integer?
>I tried to change the first parameter to the API DECLARE to Long but it did not matter.
>
>Please advise.
>
>Thanks.
>
>>
>>>
>>>I get the following error when I run the application as an exe, but does not happen when I run the same application in a VFP IDE neither as an exe or DO main:
>>>

Error#: 2027
>>>Message: Declare DLL call caused an exception
>>>Line#: 11
>>>Method: _msghandler

>>>
>>>In VFPx.vcx bindwindowseventsproxy._msghandler
>>>

...
>>>If Isnull(This._Result) Then
>>>	m.lnResult = apiCallWindowProc(This._WindowProc, m.HWnd, m.Msg, m.wParam, m.lParam)  && THIS IS THE LINE WHERE THE ERROR HAPPENS
>>>Else
>>>...

>>>
>>>It is defined twice (if it matters) in ctl32_api.prg
>>>

Function apiCallWindowProc
>>>	Lparameters lpPrevWndFunc, nhWnd, Msg, wParam, Lparam
>>>	Declare Integer CallWindowProc In win32api As apiCallWindowProc ;
>>>		Integer lpPrevWndFunc, ;
>>>		Integer nhWnd, ;
>>>		Integer msg, ;
>>>		Integer wParam, ;
>>>		Integer Lparam
>>>	Return apiCallWindowProc(m.lpPrevWndFunc, m.nhWnd, m.Msg, m.wParam, m.lParam)
>>>Endfunc

>>>
>>>and in VFPx.vcx bindwindowseventsproxy.init()
>>>

Declare Integer CallWindowProc In win32api As apiCallWindowProc ;
>>>	Integer lpPrevWndFunc, ;
>>>	Integer HWnd, ;
>>>	Integer Msg,;
>>>	Integer wParam,;
>>>	Integer Lparam

>>>
>>>I don't know how to handle this error that happens only in the exe.
>>>
>>>Please advise.