Question binary file read operation

[euromax]

Hi
I have a windows form which to summarize lets the user open a file containing 32 bit hashes, then search for one of them. The hash is then converted to its string representation.
The application is giving the results I would expect but I'd like to make it execute faster than it does now; some files can be pretty big > 100 MB. I'm doing the file read using a BackgroundWorker object to display progress updates and ensure that the UI is available during the process. But for that i need to add a System.Threading.Sleep(1) instruction in the loop; otherwise the application freezes with big files. And System.Threading.Sleep(1) creates a noticeable lag..
Any suggestions on how to make searches fast without freezing the UI? Getting speeds comparable to hex editor programs for example.
If source code is required i can post.

 

[JohnH]

Perhaps you're generating too many progress events? For example it is not necessary to send 10000 progress updates for each percent change.

 

[euromax]

thanks!

Yes good point JohnH you are right! Too many progress updates. As well as excessive System.Threading.Sleep(1) calls. For every 5kb I was doing 1250 of them (5000/4; i'm reading Int32) which implies a 1.25s lag.

Now I'm getting reasonable speeds and here's the modified function. Progress updates and sleep(1) calls are only performed when %progress changes by 5%

PS: hope you don't mind my posting c# code on a vbdotnet forum.

 

[JohnH]

hope you don't mind my posting c# code on a vbdotnet forum.

Why would you need to do that? If you're working on C# and need help with code here you can use an online code converter to get something usable to present at VB.Net forums.