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Converting General field to BMP
Message
General information
Forum:
Visual FoxPro
Category:
Pictures and Image processing
Miscellaneous
Thread ID:
00718764
Message ID:
01018541
Views:
19
Hi Bo.

Just to let you know that this piece of code has greatly helped me today.
Thanks a lot.

Best.

Ivan



>Paul,
>
>Here is some code that I use. It is kind of a crude technique, but it works for me most of the time.
>
>Hope it helps,
>
>Bo Durban
>
>
***********************************************************
>** ExtractBMP
>** Extracts a BMP file stored in a General field to a file.
>** Parameters:
>**    cGenField - Name of general field to export
>**    cFileName - Name of file to store BMP
>** Note - While this works most of the time it is not 100%.
>***********************************************************
>FUNCTION ExtractBMP
>LPARAMETERS cGenField, cFileName
>LOCAL cTempTable, cTempMemo, cFile, nAt
>
>cFileName = DEFAULTEXT(cFileName,"bmp")
>
>IF TYPE(cGenField) <> "G"
>    MESSAGEBOX(cGenField+" is not a general field")
>    RETURN .F.
>ENDIF
>
>** Temporary work area
>cTempTable = ADDBS(SYS(2023))+SYS(2015)+".tmp"
>cTempMemo = FORCEEXT(cTempTable, "fpt")
>
>COPY TO (cTempTable) FIELDS (cGenField) NEXT 1
>
>** Convert memo file to string
>cFile = FILETOSTR(cTempMemo)
>** Delete temp work area
>DELETE FILE (cTempTable)
>DELETE FILE (cTempMemo)
>
>** Locate BMP start byte
>nAt = AT("BM",cFile)
>
>IF nAt > 0
>    ** Truncate string
>    cFile = SUBSTR(cFile, nAt)
>    STRTOFILE(cFile, cFileName)
>ElSE
>    MESSAGEBOX("Could not locate BMP file in field")
>    RETURN .F.
>ENDIF
>
>RETURN .T.
Ivan
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