Why the output file is so big?

Question

Dear All,
         I am trying to write some data to the binary file. But the output file is very big. When I write 1M*4kB ,the file will more than 20MB. I don't know why.
        This is my vi, Please help me to find the fault,OK? Thank you very much.
        Thanks.
Attachments:
question1.vi ‏105 KB

Answer 1

It is NOT the same vi!!! You need to familiarize yourself with dataflow, LabVIEW does NOT execute left to right, any part can execute if all inputs have data.
In your particular case, the "file info" will execute at the same time you are building the file path. In addition, you are measuring the size of the stripped path and not of the new file. Try execution highlighting!
To fix your code:
You need to get the "file info" from the path AFTER you add the new filename.
Use the error cluster to enforce proper execution order as in my example. WIre the error out of "close" to the error in of "File info". Now the "File info" must wait until all inputs have data, which can only happen after "close" has completed.
All clear?
LabVIEW Champion . Do more with less code and in less time .
Attachments:
SizeTest.vi ‏29 KB