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VB Forum / General 2 / July 2008Process in the background.
Hi My VB aplication copies a lot of images from a removable media which is the first process (function). Is there a way to allow the copy process to run in the background, in order to let the application continue with other activities. ? (sending SQLquerries etc.) Right now I must wait untill all the files have been found and copied to my HD. A little pity. The copy process goes like this : Function CopyFile(InpFile As String, OutpFile As String) On Error Resume Next Dim ase As String Open InpFile For Binary As #1 ase = String(LOF(1), vbNullChar) Get #1, , ase Close #1 Open OutpFile For Binary Access Write As #2 Put #2, , ase Close #2 End Function > Hi > [quoted text clipped - 20 lines] > Close #2 > End Function With your current design, no. However, have you considered copying the file through SHFileOperation? This way, the program continues while explorer takes over. Raoul Watson skrev: >> Hi >> [quoted text clipped - 26 lines] > SHFileOperation? This way, the program continues while > explorer takes over. Thank you for your reply I will try to look at your proposed solution. kind regards pjl Raoul Watson skrev: >> Hi >> [quoted text clipped - 26 lines] > SHFileOperation? This way, the program continues while > explorer takes over. Thank you for your reply I will try to look at your proposed solution. kind regards pjl > Hi > [quoted text clipped - 20 lines] > Close #2 > End Function Another option is multithreading which is awkward but doable in VB6, or you can emulate it by starting another process to do the copying and some form of IPC (com, DDE, windows events, etc) to bnotify when it has finished. Whether you use this or SHFileOperation() depends how much control you want over the copying.  SignatureDean Earley (dean.earley@icode.co.uk) i-Catcher Development Team iCode Systems Dean Earley skrev: >> Hi >> [quoted text clipped - 28 lines] > Whether you use this or SHFileOperation() depends how much control you > want over the copying. Thank you for the answer.I am considering what to do. Have tried Shell (batchfile) and it looks like it goes a little faster. mvh pjl > Dean Earley skrev: >>> Hi [quoted text clipped - 34 lines] > > mvh pjl Erm, you will also find that the real CopyFile function is a lot faster, especially as the one you give doesn't do anything special. SignatureDean Earley (dean.earley@icode.co.uk) i-Catcher Development Team iCode Systems Dean Earley skrev: >> Dean Earley skrev: >>>> Hi [quoted text clipped - 37 lines] > Erm, you will also find that the real CopyFile function is a lot faster, > especially as the one you give doesn't do anything special. Hi. Tried Your advice.. Wrote this vbs Script : dim filesys Set filesys=CreateObject("Scripting.FileSystemObject") filesys.CopyFile"G:\DCIM\101MSDCF\*.jpg","c:\picture\backup\temp" and startet the vbs Script via SHELL in my VB. Result : 3 times faster !!! thank you. regars pjl |
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