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Checking files for write-access
Hiya I've got an application which is having some trouble because it keeps trying to open a file to read that's still being used by another application. In short, I have program A that writes a file and then my script B that tries to read it. The problem is, all B does at the moment is looks to see if it's there, not whether or not A is finished writing to it. So B, when it sees the file, attempts to open it, and if A is still running, B will break. So what I'm looking for is some way to determine if a file is not only existing, but also is ready for interactions with. I want it to check that a file isn't being used by another application. I imagine there's a method for it, but I can't see it anywhere. I'm using VBA 6.3 Cheers! -- F*SH ------------------------------------------------------------------------ F*SH's Profile: http://www.excelforum.com/member.php...o&userid=36355 View this thread: http://www.excelforum.com/showthread...hreadid=566966 |
#2
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Checking files for write-access
Assuming this is some text file rather than an Excel file, check out the
Open statement in VBA help and the lock argument. Trap the error if "Lock Write" fails. NickHK "F*SH" wrote in message ... Hiya I've got an application which is having some trouble because it keeps trying to open a file to read that's still being used by another application. In short, I have program A that writes a file and then my script B that tries to read it. The problem is, all B does at the moment is looks to see if it's there, not whether or not A is finished writing to it. So B, when it sees the file, attempts to open it, and if A is still running, B will break. So what I'm looking for is some way to determine if a file is not only existing, but also is ready for interactions with. I want it to check that a file isn't being used by another application. I imagine there's a method for it, but I can't see it anywhere. I'm using VBA 6.3 Cheers! -- F*SH ------------------------------------------------------------------------ F*SH's Profile: http://www.excelforum.com/member.php...o&userid=36355 View this thread: http://www.excelforum.com/showthread...hreadid=566966 |
#3
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Checking files for write-access
Thanks nick - sorry it took me so long to get a chance to try your idea! Unfortunately, it didn't work :( or at least the way I did it didn't work. I wrote the following code. In the event that the file is still being written to, the open command should fail but the error handling should suppress this and cause the execution to jump just before the command, to try again. Only when the the file is properly opened will the program continue. But it doesn't. On the first iteration, the Open command fails but the error is not suppressed. It halts, and the user is given a "permission denied" dialogue. The error handler did not engage at all. I'm not so big on error handlers, so I've probably made a mistake in my code somewhere - can anyone see it? Code: -------------------- If (Dir(strOutputFile) < "") Then ' Make sure a file exists tryAgain: ' Jump back position On Error GoTo tryAgain ' Setting the error behaviour Open strOutputFile For Input Lock Write As #1 ' Try to open the file Close #1 On Error GoTo 0 ' Stop this error handling Exit Do End If -------------------- -- F*SH ------------------------------------------------------------------------ F*SH's Profile: http://www.excelforum.com/member.php...o&userid=36355 View this thread: http://www.excelforum.com/showthread...hreadid=566966 |
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