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Microsoft Access 2010 VBA Macro Programming
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A true or false value is placed in the variable Chk by this process If Chk is true, then the file download was a success and the appropriate message is displayed Otherwise, a failure message is shown The Internet connections are closed using the API call InternetCloseHandle By using the API call FTPPutFile, files can be transferred from the local PC to the FTP server, provided that your user ID has the necessary permissions Here is the modified code:
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Sub PutFile() Dim MyConn, MyINet, Chk As Boolean Chk = False MyINet = InternetOpen("MyFTP", 1, vbNullString, vbNullString, 0) If MyINet > 0 Then MyConn = InternetConnect(MyINet, "MyOrgMyServernet", 21, _ "MyUserID", _ "MyPassword", 1, 0, 0) If MyConn > 0 Then Chk = FtpPutFile(MyConn, CurrentProjectPath & \testtxt", _ " MyFolder/MyFileNametxt", 1, 0) InternetCloseHandle MyConn End If InternetCloseHandle MyINet End If If (Chk) Then MsgBox "File uploaded" Else MsgBox "FTP Error" End If End Sub
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In applications that use FTP code to transfer files, the files are often very large and can take many minutes to transfer The problem here is that the next stage of the process does not know when the file is complete If you use the FTP process to transfer a big file over, when you look at the folder you will see the file is there almost immediately but with a very small length This then increases in size as the FTP transfer takes place
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36: Use FTP in VBA
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If you use an automated process to transfer a large file onto an FTP server (possibly as an overnight job), there may be a process on the FTP server polling once a minute to check for your file You could also have the situation in reverse You may have written a procedure to poll the FTP server once a minute for a file that you wish to download The problem in both cases is how does the procedure know that the file is fully complete If the procedure opens the partially complete file, errors will occur In cases like this, semaphore files are used to indicate the completion of the file being built These are small text files of a few bytes in length, usually with the same name as the file you wish to download, and with an SMP suffix The procedure that generates the file then generates the semaphore file when the transfer file is complete The transfer procedure polls the server for the semaphore file at minute intervals instead of the real transfer file When it finds the semaphore file, it is guaranteed that the transfer file is complete and ready to be processed
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What Happens When the 2-GB Limit Is Reached
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ccess 2010 still has a 2-GB limit in terms of file size The database cannot grow beyond this I think this is because Microsoft would rather you purchase SQL Server once you get to a database of this size! If you are importing loads of data from text files, and many applications that I have worked on do have loads of data, it is very easy to reach this limit Even if you are deleting old data, the memory is not released until you compact the database However, once your database size goes through the 2-GB limit, you are in serious trouble This can easily happen if a user imports a text file that pushes the database over the limit The text file can have a problem with it in that someone may choose to extract a week s worth of data instead of one day s worth, but users don t always look at file sizes when importing data, and they certainly have no idea of the consequences! Once over the 2-GB limit, your database will not run at all Anything you try will prompt the error message invalid argument, which is not very helpful in informing you what is wrong Even if you try to compact and repair the database, you will still get this error message In short, your application is trashed and totally useless Hopefully, your application will have been backed up every night and your latest backup copy can be used as a fallback However, if you do not have this luxury, how do you get out of this situation It is a situation that I have been in on more than one occasion The solution is to first create a new blank database You then size the application window so only the Navigation
Microsoft Access 2010 VBA Macro Programming pane is showing You also size the application window for your trashed database so only the Navigation pane is showing Place the two windows on your screen so they sit side by side Right-click the Navigation pane in each database, select Category on the pop-up menu, and then select Object Type, so all the objects are shown in type order Your screen should now look like Figure 37-1 If you are fortunate enough to have a double screen on your computer, you can set each database to each window without having to resize them Now that you have the two databases side by side, all you need to do now is drag and drop all the database objects from the trashed database to the blank database You have to do this one at a time, which is fairly time consuming, but it is a solution to recovering your application Make sure you pull across all the objects tables, queries, forms, reports, macros, and modules Linked tables can also be brought across in this way Once everything has been transferred to the new database, make sure you do a compact and repair on the new database to make sure it is as small as possible You now have a fully working copy of your original database, complete with the most recent users data, and your reputation has been saved!
Figure 37-1
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