Delphi Check File Size
Function FileSize ( var FileHandle: File; ): Integer; Description. The FileSize function gives the size in records of an open file. Before this function can be used, the file must be assigned a handle by using AssignFile and opened using Append, Reset or ReWrite routines. The FileSize function returns the size of a file, in bytes -- a useful result for certain file-handing applications within a Delphi program. Get File Size The FileSize function returns the size of a file in bytes; the function returns -1 if the file was not found. Use the Win32 API SHChangeNotifyRegister function to watch for changes in the temp folder, and then have your callback check if your temporary files are reporting changes. Since you know the exact file(s) you are interested in, you can manually monitor them directly for changes to their sizes and timestamps using FindFirstFile in a timer or thread. I am trying to check whether a text file is empty or not. There is a function in TP which is called 'FileSize' that can be used to get the size of the file in byte. Unfortunalety this function cannot be used for text file. Does anybody know a way of writing similar function for text files. Delphi Programming; idFTP client - checking it the files exist. IdFTP client - checking it the files exist Hi! Is there any way to check if the file that the user wants to upload already exists on this server? Thanks for all advices, Stander Faq. November 9th, 2005, 07:27 PM #2. View Profile.
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My app contains documents in its database. The users can open the documents in which case, the document gets saved to a temporary folder and gets opened on the user's computer.
I'd like to get a notification when one of these temporary files are changed, and offer the user to save the changed document back to the database.
What is the most simple way to do this in Delphi7? (I suppose it requires some shell magic or 3rd party component)
Thanks!
RRUZ4 Answers
You can either:
use the Win32 API SHChangeNotifyRegister function to watch for changes in the temp folder, and then have your callback check if your temporary files are reporting changes.
since you know the exact file(s) you are interested in, you can manually monitor them directly for changes to their sizes and timestamps using FindFirstFile in a timer or thread.
You can detect changes in your temporary files (or any file) using the TJvChangeNotify component from the JEDI JVCL collection.
In addition to what RRuz and Remy Lebeau wrote:
Note that TJvChangeNotify in the JvChangeNotify unit makes use of the FindFirstChangeNotification API call; this is the MSDN documentation. Note it is a bit counter-intuitive: see the thread mentioned below on how to use it inside a while loop.
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There is also the ReadDirectoryChanges API call, which is not wrapped by the JCL/JVCL, and has MSDN documentation here and there is a Delphi win32 example as well.
This thread explains the differences between the two API calls.
--jeroen
Also take a look at this: http://www.cromis.net/blog/downloads/directory-watch/ and How to monitoring directory for files in Delphi XE?
Not the answer you're looking for? Browse other questions tagged delphiwinapishellfile-iodelphi-7 or ask your own question.
My app contains documents in its database. The users can open the documents in which case, the document gets saved to a temporary folder and gets opened on the user's computer.
I'd like to get a notification when one of these temporary files are changed, and offer the user to save the changed document back to the database.
What is the most simple way to do this in Delphi7? (I suppose it requires some shell magic or 3rd party component)
Thanks!
RRUZ4 Answers
You can either:
use the Win32 API SHChangeNotifyRegister function to watch for changes in the temp folder, and then have your callback check if your temporary files are reporting changes.
since you know the exact file(s) you are interested in, you can manually monitor them directly for changes to their sizes and timestamps using FindFirstFile in a timer or thread.
Windows Check File Size
You can detect changes in your temporary files (or any file) using the TJvChangeNotify component from the JEDI JVCL collection.
In addition to what RRuz and Remy Lebeau wrote:
Delphi Check File Size Online
Note that TJvChangeNotify in the JvChangeNotify unit makes use of the FindFirstChangeNotification API call; this is the MSDN documentation. Note it is a bit counter-intuitive: see the thread mentioned below on how to use it inside a while loop.
There is also the ReadDirectoryChanges API call, which is not wrapped by the JCL/JVCL, and has MSDN documentation here and there is a Delphi win32 example as well.
This thread explains the differences between the two API calls.
--jeroen
Also take a look at this: http://www.cromis.net/blog/downloads/directory-watch/ and How to monitoring directory for files in Delphi XE?
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