Specifying byte stream type for Read File with Type Descriptor
Hi.
I'm trying to write a VI that reads an image file format that can have
different datatypes. What I have so far is that I open the file, read
the header, and get the width, height, number of frames, and datatype.
I calculate number of pixels by nrows*ncols*nframes with no problem,
but I'm not sure how to tell Read File the correct datatype to read
the data into.
I tried using a Case structure where I have a Read File in each case
with the correct type constant as input for that case. The problem is
that the tunnel graduates the datatype to the highest representation.
I found in Application Note 154 the discussion about Type Descriptors.
Is there a way to generate a Type Descriptor and output it from a C
ase
structure? I tried just returning the value (e.g. 0x0402 for a Word),
but Read File will just see that the byte stream type is a uint32.
Is there any other way to do this?
Thanks for any help.
I converted the code to LabVIEW 6.1 for you and attached it below.
Don't worry about being a newbie. We all start there. Keep asking this type of question and you won't stay there long.
As you are discovering, being strictly typed means that you must rewrite code even for a simple data type change, or convert everything to the same data type first. For image data, conversion can result in a lot of extra space being wasted. Use a modified version of the GLV_WaveformBuffer.vi to hold your data. Use the array functions, which operate inline, to add to and delete the data wires in the buffer. This allows you to save several different data types. You will need several different inputs and outputs to handle these data types. I ha
ve also attached a similar file created for exactly the problem you have - storing arrays of different data types (data from NI-SCOPE devices, in this case - can be float, I8, I16, or I32).
Routines that take any type work in one of two ways. LabVIEW primitives, such as plus and minus operators, work by figuring out the type and doing the right thing in the C code layer of the LabVIEW environment. Users of LabVIEW can't do this. Users can make polymorphic VIs. Polymorphic VIs are actually a single VI for every data type that are referenced by a "wrapper", the polymorphic VI. Users still need to write a different VI for every data type they need.
Take home message - if you need to work with different data types, you will need to rewrite your code for every data type or convert your data to a common data type. Polymorphic VIs and case statements are your friend.
Let me know if you need more help.
This account is no longer active. Contact ShadesOfGray for current posts and information.
Attachments:
GigaLabVIEW61.zip 362 KB
sfpScpChan_Waveform_Buffer.zip 74 KB
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