title: Get coordinates of specified text on current screen
body: <p>all.<br/>
  i wanna write a tool for GUI automation which can locate text label on current screen(the absolute location) so that i can drive the mouse cursor to click on it.<br/>
  The signature of the needed function should like  this:<br/></p>
  
  <p>Point GetTextCoordination(string text)<br/></p>
  
  <p>Any one have an idea how implement this? I don't wanna use the OCR or computer vision technology for performance issue. Is the hooking  of the TextOut win32api function a feasible way? </p>