Append data to existing sound (.wav) file

[RCooper]

Hello, I am using LV2010 to create an application that logs sound data. This works fine. However, the customer has requested the ability to re-open a session and record more data to the .wav file. And when Sound File Open Write VI is passed an existing file, it doesn't append, it overwrites. This is a problem for me. Is there an elegant way to append to a .wav file in LabVIEW? I suppose I could open the file for read, read out the data, close the file, re-open it for write, write in the existing data, then start writing new data. This seems horribly inefficient, but I'm not seeing a better way just yet. I do have LV2012 installed if you don't have 2010 handy to provide an example.

[billko]

---

@RCooper wrote:
Hello, I am using LV2010 to create an application that logs sound data. This works fine. However, the customer has requested the ability to re-open a session and record more data to the .wav file. And when Sound File Open Write VI is passed an existing file, it doesn't append, it overwrites. This is a problem for me. Is there an elegant way to append to a .wav file in LabVIEW? I suppose I could open the file for read, read out the data, close the file, re-open it for write, write in the existing data, then start writing new data. This seems horribly inefficient, but I'm not seeing a better way just yet. I do have LV2012 installed if you don't have 2010 handy to provide an example.

---

How about stripping the .wav header from the second file and append the second file to the first?

[edited because my first reply sounded a bit harsh]

[RCooper]

My first post may not have been clear, but I am trying to record additional data to the SAME .wav file.  There is only one file (and writing a second file is not acceptable for this app).

The question is whether you can open a .WAV file in append instead of overwrite mode.

[RCooper]

For some reason, the formatting got messed up in my first post; here is it properly formatted:

Hello,

I am using LV2010 to create an application that logs sound data. This works fine. However, the customer has requested the ability to re-open a session and record more data to the .wav file. And when Sound File Open Write VI is passed an existing file, it doesn't append, it overwrites

This is a problem for me. Is there an elegant way to append to a .wav file in LabVIEW? I suppose I could open the file for read, read out the data, close the file, re-open it for write, write in the existing data, then start writing new data. This seems horribly inefficient, but I'm not seeing a better way just yet

I do have LV2012 installed if you don't have 2010 handy to provide an example.

[billko]

---

@RCooper wrote:

My first post may not have been clear, but I am trying to record additional data to the SAME .wav file.  There is only one file (and writing a second file is not acceptable for this app).

The question is whether you can open a .WAV file in append instead of overwrite mode.

---

Like you, I have seen that it is not immediately evident if you could do this or not.  That being the case, I think your way would work - it's probably the most elegant way after all, too.

[RCooper]

Yeah, I'm afraid that might be right.  I was just wondering if someone had found a slicker way to add to an existing .wav.  I'll leave this open in case someone else has input.

Thanks for having a look, Bill!