Colleaugues, I hope somebody can solve this mistery of mine:
I experienced an unusuall behaviour by the "Read File.vi" in context it had already worked OK before. In short, I have 2 small apps: * DAQ - implements continuous acquisition in buffered blocks of 500 scans (multiple channels in general) where the last block can be shorter * BinRead - meant to reproduce the the continuosly acquired channel(s) with a single "Read File.vi" inside a loop Problem description on concrete example: If I set the DAQ as follows: # of Channels = 1 Sampling Rate [S/s] = 900 DAQ Duration [s] = 3 It performs the continuos acquisition and streams to BIN file in 6 blocks because obviously the DAQ will last 2700 (3x900) scans saved in 6 blocks (5x500 & 1x200). I decided to put header for every block produced and saved for better reconstruction in the presentation part. Following the "offset" output of the "Write File.VI" it is obviously working perfectly: after iteration #1 => 2008 (500 doubles x 4 bytes + 8 header-bytes) after iteration #2 => 4016 after iteration #3 => 6024 after iteration #4 => 8032 after iteration #5 => 10040 after iteration #6 => 10848 (200 doubles x 4 bytes + 8 header-bytes) The problem is in the BinRead app when it tries to retrieve BIN data from the file. Logically I would expect it to read out all the data in 6 iterations with no need to wire "pos mode", "pos offset" and "offset", since each block is saved with a corresponding header and the "data type" is correctly wired to an 2D empty array. However, after the 1st iteration its "offset" says 4008 instead of the expected 2008! So everything is wrong afterwards. I have wired lot of indicators to control every step that is being made, even tried to force the "pos offset" to read in steps of 2008, but the read data is 4008 bytes in length and I cannot comprehend why?! Can some of you see what is wrong in this simple (by-the-book) wiregram that I am overlooking and explain how does saved block of 2008 bytes increase when read to size of 4008? The header-ing with "Write File.vi" works OK in other apps I have tested ... Thanking you in advance I look forward to hearing from you, Roman Golubovski, MSc Dipl-EEng [EMAIL PROTECTED]
