MFC, How to show progress during long document open?

How to show progress during long document open?

Author	Message
Paul Higg #1 / 6	How to show progress during long document open? I have an MFC MDI Document/View application. Basically the Document is just a representation of data from an SQL Server. At the moment I populate it with data during the OnNewDocument call. However as it takes 10-20 seconds to populate there is no application window showing during start-up of the program during this process. I would like to be able to show some progress for this? Any ideas on the best way to do this? Cheers Paul Higgs
Mon, 23 Aug 2004 20:45:00 GMT

Ronald W Crai #2 / 6	How to show progress during long document open? I would throw up a splash screen with a nice graphic on it and then have a progress indicator showing what % is loaded. If you have seen Adobe PhotoShop, or Adobe AcroBat reader, use these as an example of a nice loading screen Quote: > I have an MFC MDI Document/View application. Basically the Document is just > a representation of data from an SQL Server. At the moment I populate it > with data during the OnNewDocument call. However as it takes 10-20 seconds > to populate there is no application window showing during start-up of the > program during this process. I would like to be able to show some progress > for this? > Any ideas on the best way to do this? > Cheers > Paul Higgs
Mon, 23 Aug 2004 22:00:55 GMT

Joseph M. Newcome #3 / 6	How to show progress during long document open? There are some issues to consider. If you are off computing, the GUI is not being refreshed, so you won't see the progress bar move. The simplest way to handle something like this is to do the work in a thread, and use PostMessage to send information back to the main GUI thread to update the progress bar. Note that you will have to provide suitable synchronization on the document to keep it from being used improperly during the update. joe Quote: >I have an MFC MDI Document/View application. Basically the Document is just >a representation of data from an SQL Server. At the moment I populate it >with data during the OnNewDocument call. However as it takes 10-20 seconds >to populate there is no application window showing during start-up of the >program during this process. I would like to be able to show some progress >for this? >Any ideas on the best way to do this? >Cheers >Paul Higgs Joseph M. Newcomer [MVP] Web: http://www3.pgh.net/~newcomer MVP Tips: http://www3.pgh.net/~newcomer/mvp_tips.htm
Tue, 24 Aug 2004 05:02:11 GMT

Paul Higg #4 / 6	How to show progress during long document open? Thanks. This worker thread will be adding information into a treeview on the CView of the document, is it safe to do this from a worker thread , e.g. pass the worker thread a pointer to my CDocument object? Quote: > There are some issues to consider. If you are off computing, the GUI is not being > refreshed, so you won't see the progress bar move. The simplest way to handle something > like this is to do the work in a thread, and use PostMessage to send information back to > the main GUI thread to update the progress bar. Note that you will have to provide > suitable synchronization on the document to keep it from being used improperly during the Quote: > update. > joe > On Thu, 7 Mar 2002 12:45:00 -0000, "Paul Higgs" Quote: > >I have an MFC MDI Document/View application. Basically the Document is just > >a representation of data from an SQL Server. At the moment I populate it > >with data during the OnNewDocument call. However as it takes 10-20 seconds > >to populate there is no application window showing during start-up of the > >program during this process. I would like to be able to show some progress > >for this? > >Any ideas on the best way to do this? > >Cheers > >Paul Higgs > Joseph M. Newcomer [MVP] > Web: http://www3.pgh.net/~newcomer > MVP Tips: http://www3.pgh.net/~newcomer/mvp_tips.htm
Wed, 25 Aug 2004 00:46:46 GMT

Joseph M. Newcome #5 / 6	How to show progress during long document open? Only if you guarantee that whatever is being done is properly synchronized, that is, if the worker thread can write to the CDocument, whatever it is writing must be protected by a CRITICAL_SECTION; or, if it is reading from the CDocument but the GUI thread can be writing to the CDocument, likewise you must protect the data. Concurrent, unsynchronized, access is permitted only in the cases where the values are ONLY being read but not modified by the two threads (e.g., if the GUI thread sets up data before spawing the worker thread, and does not change it until it knows the worker thread has terminated, this is a form of synchronization, but does not require a CRITICAL_SECTION). And the worker thread must not modify the tree control directly, only by sending requests to the GUI thread to perform the modifications. joe Quote: >Thanks. >This worker thread will be adding information into a treeview on the CView >of the document, is it safe to do this from a worker thread , e.g. pass the >worker thread a pointer to my CDocument object? >> There are some issues to consider. If you are off computing, the GUI is >not being >> refreshed, so you won't see the progress bar move. The simplest way to >handle something >> like this is to do the work in a thread, and use PostMessage to send >information back to >> the main GUI thread to update the progress bar. Note that you will have to >provide >> suitable synchronization on the document to keep it from being used >improperly during the >> update. >> joe >> On Thu, 7 Mar 2002 12:45:00 -0000, "Paul Higgs" >> >I have an MFC MDI Document/View application. Basically the Document is >just >> >a representation of data from an SQL Server. At the moment I populate it >> >with data during the OnNewDocument call. However as it takes 10-20 >seconds >> >to populate there is no application window showing during start-up of the >> >program during this process. I would like to be able to show some >progress >> >for this? >> >Any ideas on the best way to do this? >> >Cheers >> >Paul Higgs >> Joseph M. Newcomer [MVP] >> Web: http://www3.pgh.net/~newcomer >> MVP Tips: http://www3.pgh.net/~newcomer/mvp_tips.htm Joseph M. Newcomer [MVP] Web: http://www3.pgh.net/~newcomer MVP Tips: http://www3.pgh.net/~newcomer/mvp_tips.htm
Thu, 26 Aug 2004 15:54:43 GMT

Paul Higg #6 / 6	How to show progress during long document open? Thanks for the help. Paul Quote: > Only if you guarantee that whatever is being done is properly synchronized, that is, if Quote: > the worker thread can write to the CDocument, whatever it is writing must be protected by > a CRITICAL_SECTION; or, if it is reading from the CDocument but the GUI thread can be > writing to the CDocument, likewise you must protect the data. Concurrent, unsynchronized, > access is permitted only in the cases where the values are ONLY being read but not > modified by the two threads (e.g., if the GUI thread sets up data before spawing the > worker thread, and does not change it until it knows the worker thread has terminated, > this is a form of synchronization, but does not require a CRITICAL_SECTION). And the Quote: > worker thread must not modify the tree control directly, only by sending requests to the > GUI thread to perform the modifications. > joe > On Fri, 8 Mar 2002 16:46:46 -0000, "Paul Higgs" Quote: > >Thanks. > >This worker thread will be adding information into a treeview on the CView > >of the document, is it safe to do this from a worker thread , e.g. pass the > >worker thread a pointer to my CDocument object? > >> There are some issues to consider. If you are off computing, the GUI is > >not being > >> refreshed, so you won't see the progress bar move. The simplest way to > >handle something > >> like this is to do the work in a thread, and use PostMessage to send > >information back to > >> the main GUI thread to update the progress bar. Note that you will have to > >provide > >> suitable synchronization on the document to keep it from being used > >improperly during the > >> update. > >> joe > >> On Thu, 7 Mar 2002 12:45:00 -0000, "Paul Higgs" > >> >I have an MFC MDI Document/View application. Basically the Document is > >just > >> >a representation of data from an SQL Server. At the moment I populate it > >> >with data during the OnNewDocument call. However as it takes 10-20 > >seconds > >> >to populate there is no application window showing during start-up of the > >> >program during this process. I would like to be able to show some > >progress > >> >for this? > >> >Any ideas on the best way to do this? > >> >Cheers > >> >Paul Higgs > >> Joseph M. Newcomer [MVP] > >> Web: http://www3.pgh.net/~newcomer > >> MVP Tips: http://www3.pgh.net/~newcomer/mvp_tips.htm > Joseph M. Newcomer [MVP] > Web: http://www3.pgh.net/~newcomer > MVP Tips: http://www3.pgh.net/~newcomer/mvp_tips.htm
Fri, 03 Sep 2004 20:41:59 GMT

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