Comments by bigcdh (Top 11 by date)

Hmm, well shouldnt be any reason why it wouldnt work that I can see.

Try taking the try / catch out and see if it throws an error which may give you more of an indication.

Also, just out of interest, you dont need to use cnn.Open() or cnn.Close() as when filling an adapter with a dataset this is already taken care of. Just a couple less lines of code :-)

Hi Richard, thats exactly what I want to do. Ready three bytes at the start of every 512 block.

Reading the man pages for Windows API, I'm sure I have to advance the pointer manually.

http://vmd.myxomop.com/apires/ref/r/readfile.html

ReadFile reads the desired amount of bytes from a file. The file must of course have been opened with at least read-level access. If the file is synchronous (not overlapped), the function begins reading the file from the current position of the file pointer, and the function automatically adjusts the file pointer to point to the byte immediately after the last byte read. If the file is asynchronous (overlapped), the structure passed as lpOverlapped identifies the point to begin reading from, and the program calling the function is responsible for updating the file pointer.

should be exactly the same... whats the error you get?

p.s. just thinking about it, as its an overlapped file thats used, I thought I'd have to manually move the pointer, so despite reading the first 512 bytes initially, I'd still need to advance the pointer to the end of that 512 bytes to read the next lot. Not sure...

Thanks Richard. I'm looking to read in the contents of a drive, not a particular file. The idea is to look for all jpeg headers within.

Appreciate the spot with setting the position to where I'm currently at, however as I'm in a while loop, shouldnt it increment on each iteration as I'm telling it to read 512, 1024, 1536 ... bytes from the start by multiplying the count by 512..

password is a reserved word in Access. It may be useful to change the column name, maybe try UserPassword to make it distinct and avoid further issues like this.