新人求助，屏幕取色。

IF n=1
   DECLARE integer GetPixel IN WIN32API as "GetPixel" integer hDc,integer xPos,integer yPos
   DECLARE integer GetDC IN WIN32API as "GetDC" integer hWnd
   DECLARE integer ReleaseDC IN WIN32API as "ReleaseDC" integer,integer
   hDcScreen=GetDC(0)
   LOCAL xRgbColor as Integer
   xRgbColor=GetPixel(hDcScreen,364,291)
  if int(xRgbColor/65536)=255.and.int((xRgbColor%65536)/256)=255.and.xRgbColor%256=255
    bls="0"
  else
    bls="1"
  endif
  go ff
  do case
     case fff<101
     replace hzb1 with trim(hzb1)+bls
     case fff>100.and.fff<201
     replace hzb2 with trim(hzb2)+bls
     case fff>200.and.fff<301
     replace hzb3 with trim(hzb3)+bls
     case fff>300
     replace hzb4 with trim(hzb4)+bls
  endcase  
  fff=fff+1
  thisform.container1.image1.left=thisform.container1.image1.left-24
  if fff=401
    fff=1
    ff=ff+1
    thisform.container1.image1.top=thisform.container1.image1.top-24
    thisform.container1.image1.left=0
  endif
  ReleaseDC(0,hDcScreen)
  clear dlls
endif

各位老大，这个代码是偶连抄带蒙写出来的。意思就是屏幕取色，写到表里。可执行到第十四条记录失效，怀疑是内存溢出。请各位老大助小弟一臂之力，先谢谢了。