Quick Array Population

Question

I have a application that will capture the screen and I want to write the captured information to an array, this takes AGES as the array ends up being +2million values. I am iterating and adding the values to the array, is there any way quicker (eg binary operations)? Should it be this slow? Why is it?

score 1 · Answer 1 · edited May 23 '17 at 12:05

1

Assuming your GetPixel'ing the screen pixel by pixel, its the GetPixel call that's slow (it interrogates the display driver) not the (pre-dimensioned) array assignment.

You can instead use the getdibits() api which will copy the DC's colour info into a buffer in a single call.

Here is a C++ example, but the methodology & call sequence is the same as for VB.

edited May 23 '17 at 12:05

Community

1
1

answered Mar 13 '12 at 11:29

Alex K.

171,639
30
264
288

score 1 · Accepted Answer · answered Mar 17 '12 at 02:02

1

Figured out why it was so slow, it was because I was using ReDim on every iteration of the loop - thanks for the help anyways

Martin

answered Mar 17 '12 at 02:02

marscom

615
2
11
24

Quick Array Population

2 Answers2