Wei Xie wrote: > > Dear Rooters' > > Assume I have a data file which is written on a disk, and deleted > automatically after 5 minutes, and then written on the disk again. > This loop will continues as long as necessary. > > If I want to read the file in ROOT every now and then, > the old file may have already been deleted and new file is still being > written and not finished yet. So if I read it at this moment, some > errors will occur. Is there any method in ROOT that can distinguish if > a file is finished written or not ? > You can test if at least one object has been written to the file with: TFile *myfile; myfile = new TFile("myfile.root"); if (myfile.GetSeekKeys() <= 64) { printf("file probably not yet closed\n"); // wait and try again } Note that you will get a Warning message from Root every time you try to connect a file not yet closed. Rene Brun
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