Hi Jon,

You hit a VFP bug. When Windows API function is declared w/o alias VFP releases any previous declarations with an alias.
You can use a trick from GdiPlusX. Comment out DECLARE and create following function. If GS_SplitReleaseDC is not declared yet, the function will be called. Otherwise the function in DLL will be called.

FUNCTION GS_SplitReleaseDC(hWnd, HDC)
DECLARE Long ReleaseDC IN WIN32API AS GS_SplitReleaseDC Long hWnd, Long HDC
RETURN GS_SplitReleaseDC(m.hWnd, m.HDC)

>
>Can anyone shed any light on this for me?
>
>This is declared in the toolbar:
>declare integer ReleaseDC in WIN32API as GS_SplitReleaseDC integer hWnd, integer HDC
>? GS_SplitReleaseDC(0,-12345) && this is garbage but returns a result of 0.
>
>then:
>_REPORTPREVIEW = ("c:\products\ppwin\dev9\ReportPreview.app")
>EXTERNAL CLASS frxPreview.vcx
>NewForm = NEWOBJECT([frxpreviewForm],[frxPreview],_REPORTPREVIEW)
>loRef = NULL
>DO (_REPORTPREVIEW) WITH loRef
>repORT form "C:\Tmp\frx2any\Samples\VFP 9\VFP 9 Reports\usingchartenginewithvfp9.frx" preview
>
>If I try to call the following I get an error saying GS_SplitReleaseDC doesnt exist:
>? GS_SplitReleaseDC(0,-12345) && now errors
>
>I have looked inside the ReportPreviewer project and I can see that it also declares ReleaseDC.
>
>Currently the only way I can see around this is to re-declare ReleaseDC after the previewer has finished, is there a better way to do this?
>
>Thanks
>
>Jon