opencv in visual studio 2008

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I work about opencv in visual studio 2008

I access imageData of grayscale image. The code is

int step = tempimage->widthStep;
uchar * data = (uchar *)tempimage->imageData;
if( (x+y*step+1+step)<(width+height*step) ){
        if( int(data[x+y*step+1+step])==0 )
            count++;
    }

but it have error

compiler tell data have value 255'.' and type unsigned

please help me how to solve this problem

thank.

-- update from OP --
Screenshot of error
http://img684.imageshack.us/i/cpopencvinvisualstudio2.png/[^]
(moved to Imageshack)
--

Posted 30-Jan-11 3:32am

bingz

Updated 30-Jan-11 14:45pm

Indivara

v3

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Indivara 30-Jan-11 9:56am

Where? Which line? Can you update the question with the full message?

Richard MacCutchan 30-Jan-11 10:23am

This code works OK for me; try posting the exact compiler error you see and maybe we can help.

Indivara 30-Jan-11 20:42pm

That is a runtime error, not a compiler error. Please update your question, don't add an answer (I'll update it this time)

bingz 30-Jan-11 21:19pm

the value of the pixel should be 255 but it is 255'.'

Indivara 31-Jan-11 0:55am

'.' is the debugger's interpretation of the value 255. As I said in the answer, the value is of no concern here. What matters is that you are reading from an invalid memory location (memory not allocated by your program)

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bingz · Answer 1 · 2011-01-30T07:03:00

Solution 1

This is my bug

http://www.tempf.com/getfile.php?id=845750&key=4d45a68e613af

[url=http://www.tempf.com/getfile.php?id=845750&key=4d45a68e613af]http://www.tempf.com/getfile.php?id=845750&key=4d45a68e613af[/url]

how to solve this problem

Posted 30-Jan-11 7:03am

bingz

Indivara · Answer 2 · 2011-01-30T14:49:00

Solution 2

That is probably because you are reading the array data[] beyond its length. In this case, the value 255 has no meaning, it is just some data that happens to be in the memory beyond the end of the array. Check the allocated length, and the array index when the error occurs.

Posted 30-Jan-11 14:49pm

Indivara

Comments

bingz 31-Jan-11 0:28am

i think array index is true because the first if condition check index of array must less than number of pixel in this image

Indivara 31-Jan-11 0:57am

That may be so, but we couldn't possible comment based on the code fragment. Debug it further, put the address of data[] in the memory window (the one that allows you to monitor the memory contents), and see how it changes as you step through.