Textwidth() and font positioning.

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Simon S

Well this is my attempt so far.

Extern "win32"
	Function GetActiveWindow()
	Function GetcharABCwidths(hdc,ifirstchr,ilastchr,lpbuffer:abc)
End Extern

Graphics 800, 600, 0

 
Type abc
	Field abcA:Int
	Field abcB:Int
	Field abcC:Int
End Type

hWnd:Int = GetActiveWindow()
hDC:Int = GetDC(hWnd)

result:abc=New abc
font:timagefont=LoadImageFont("steve.ttf",30)
SetImageFont(font)

num=GetCharABCwidths(hdc,32,32,result)

Which gives me this message
"C:/Work/My Programs/My Utilities/Animfonts/.bmx/getfontwidth.bmx.gui.debug.win32.o(code+0x19b): undefined reference to `GetcharABCwidths@16'"

The whole ABC concept I understand, A and C are the spaces before and after the font, B the actual width. Which I got from the MSDN page
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/fontext_448i.asp

So close but no cigar. Still stumped by it. I understand what it has to do, but not how to express it in Bmax.