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Hi Buck. Thanks for you quick reply. I'm not really sure what loads bufferdtafld. I got this code from an example and modified to output to a file. I really have not used pointers in the past, and while understand the underlying principal, it is still a little fuzzy. Here is all the code: D BufferHdl S 10I 0 D BufferSize S 10I 0 Inz( 1920 ) D BufferIncr S 10I 0 Inz( 1920 ) D NbrBytesRead S 10I 0 D BufferPtr S * D BufferDtaFld S 32767 Based( BufferPtr ) D BufferDta S 32767 D BufferPos S 10I 0 Inz( 1 ) D NoAPIError C Const( *Zero ) D APIErrorPassed S 1N D Status S 1N D APIErrorDS DS D BytesProvided 10I 0 Inz( %Size( APIErrorDS ) ) D BytesAvail 10I 0 Inz( *Zero ) D MsgID 7 Inz( *Blanks ) D Reserved 1 Inz( X'00' ) D MsgDta 256 Inz( *Blanks ) * ------------------------------------------------------------------- * ------------------------------------------------------------------- * - Determine whether API error parameter was passed - * ------------------------------------------------------------------- C If %Parms > *Zero C Eval APIErrorPassed = *On C EndIf * ------------------------------------------------------------------- * - Create input buffer - * ------------------------------------------------------------------- C Reset APIErrorDS C Eval BufferHdl = CrtInputBuffer( C BufferSize : C BufferIncr : C *Omit : C *Omit : C APIErrorDS C ) C If BytesAvail <> NoAPIError C ExSr ReturnError C EndIf * ------------------------------------------------------------------ * - Read screen image * ------------------------------------------------------------------ C Reset APIErrorDS C Eval NbrBytesRead = ReadScreen( C *Omit : C BufferHdl : C *Omit : C *Omit : C APIErrorDS C ) C If BytesAvail <> NoAPIError C ExSr ReturnError C EndIf * ------------------------------------------------------------------ * - Retrieve pointer to buffer data * ------------------------------------------------------------------ C Reset APIErrorDS C Eval BufferPtr = RtvBufferPtr( C BufferHdl : C *Omit : C APIErrorDS C ) C If BytesAvail <> NoAPIError C ExSr ReturnError C EndIf * ------------------------------------------------------------------- * - Retrieve input buffer data and print screen image - * ------------------------------------------------------------------- C Eval BufferDta = BufferDtaFld (errors here) C DoW BufferPos <= NbrBytesRead C Eval ScrnData = %Subst( C BufferDta : C BufferPos : C %Size(ScrnData ) C ) C Open ScrnImg C Write fScrnimg C Close ScrnImg C Eval BufferPos = BufferPos + %Size( ScrnData ) C EndDo * ------------------------------------------------------------------- I have compared V4R4 to V4R5 API's and they look the same to me. Thanks again. Alison
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