Question

Copying files in use to another directory.

Asked by: MrGregwa

I am looking for a way to copy files/tables in use that are not exclusive to another folder on the same computer.  I have heard about SHFileOperation Win32 API but can't find much helpfull information on it.  Has anyone use it before and is that the best API to use.  

Thanks,
-Greg

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Asked On
2009-09-18 at 15:43:12ID24744814
Topic

FoxPro Database

Participating Experts
4
Points
500
Comments
6

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Answers

 

by: pcelbaPosted on 2009-09-18 at 15:56:59ID: 25370633

If these files are not in exclusive use then you may do it in Visual FoxPro following way:

1) for DBF tables:

USE table SHARED
COPY TO NewLocation WITH CDX

2) for file of any type:
COPY FILE YourFie TO YourNewFile

An exception can rise if copied files are open exclusively by another process. But it is easy to handle it.

 

by: pcelbaPosted on 2009-09-18 at 16:10:22ID: 25370684

 

by: CaptainCyrilPosted on 2009-09-18 at 23:14:33ID: 25371695

Here is my function.

Choose FoxPro or API in this variable: cFileFunctions

You can copy the files using foxpro or windows api. Just specify source and destination for the function.

FUNCTION FileCopy
LPARAMETERS cSourceFileName, cDestinationFileName
LOCAL lOK, cCommand
lOK = .T.
DO CASE
	CASE cFileFunctions = 'FoxPro'
		TRY
			cCommand = 'COPY FILE "' + cSourceFileName + '" TO "' + cDestinationFileName + '"'
			&cCommand
		CATCH
			lOK = .F.
		ENDTRY
	CASE cFileFunctions = 'API'
		DECLARE INTEGER CopyFile IN WIN32API;
			STRING source, STRING destination
		lOK = CopyFile(cSourceFileName,cDestinationFileName) <> 0
		CLEAR DLLS
ENDCASE
RETURN lOK
                                              
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by: tusharkanvindePosted on 2009-09-19 at 00:19:35ID: 25371868

If a DBF file is copied by OS functions while in use, the  copy could end up corrupted. It is better to use the table and then copy its records

lcSource=YourTableName
lcTarget=ADDBS(YourPath)+YourTableName

TRY
   USE (lcSource) SHARED
   COPY TO (lcTarget) WITH CDX
CATCH
   Messagebox('YourErrorMessage')
ENDTRY

 

by: jrbbldrPosted on 2009-09-19 at 07:16:32ID: 25373113

I'm not sure why you are bothering with an 'external' method such as SHFileOperation when 2 perfectly good and easy to use methods already exist within Foxpro/Visual Foxpro.

Pavel (pcelba) already showed you above how to Copy DBF files and non-DBF files in a very simple manner.

If, by chance, you are not using FP/VFP, then you are probably posting in the wrong language-specific forum.

Good Luck

 

by: pcelbaPosted on 2009-09-19 at 07:52:46ID: 25373213

Problem of COPY FILE command is almost none progress animation. SHFileOperation offers it and the link published in answer ID:25370684 shows how to call it from FoxPro. VB related link was added just in case author is in wrong EE zone :-).

And it is also good if others will extend the already posted answer.

This kind of API call is obviously used when customer asks for it explicitly. Yes, ve've used it before, unfortunately, none of us can say if SHFileOperation is the best API to use because we all are using COPY TO and COPY FILE... :-)

20120131-EE-VQP-002

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