sockets - c# Bitmap is already locked screenshots -


im trying make program takes screen shots , compare them.

this sample of code

compare method:

    [dllimport("msvcrt.dll", callingconvention = callingconvention.cdecl)]     static extern int memcmp(intptr b1, intptr b2, uintptr count);     public bool comparememcmp(bitmap b1, bitmap b2)     {          if ((b1 == null) != (b2== null)) return false;         //  if (b1.size != b2.size) return false;                 var bd1 = b1.lockbits(new rectangle(new point(0, 0), b1.size), imagelockmode.readonly, pixelformat.format32bppargb);         var bd2 = b2.lockbits(new rectangle(new point(0, 0), b2.size), imagelockmode.readonly, pixelformat.format32bppargb);               intptr bd1scan0 = bd1.scan0;             intptr bd2scan0 = bd2.scan0;              int stride = bd1.stride;             int len = stride * b1.height;              return memcmp(bd1scan0, bd2scan0, (uintptr)(len)) == 0;       }

thisis main code: 

 private void mainform_load(object sender, eventargs e)     {           prev = capturescreen.getdesktopimage();         th = new thread(new threadstart(capture));         th.start();     }        private void capture()     {           while (true)         {              current = capturescreen.getdesktopimage();              if (comparememcmp(prev, current))             {               label1.invoke(new action(() => label1.text="changed"));                 prev = current;             }              else                 label1.invoke(new action(() => label1.text = "same"));              count++;          }       }

im getting weird error int comparememcmp method @ line

 var bd1 = b1.lockbits(new rectangle(new point(0, 0), b1.size), imagelockmode.readonly, pixelformat.format32bppargb);

i guess it's related screenshot take.. cuz when compare 2 images directory works fine... idea how relase them guys?

you should call unlockbits() on bitmap after done comparing. see example on msdn.

... int stride = bd1.stride; int len = stride * b1.height;  b1.unlockbits(bd1); b2.unlockbits(bd2);  return memcmp(bd1scan0, bd2scan0, (uintptr)(len)) == 0; ...

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