Using GD with D

Hello,

I'm trying to use GD in a D program,
but I always get an error when I try to use gdImagePng:
"Error: Access Violation"

I use WinXP, Digital Mars D Compiler 1.007
(http://www.digitalmars.com/d/), D-Bindings from
http://www.algonet.se/~afb/d/gd.zip
and the latest Windows-GD-DLL.

I can compile the program:
dmd -v example.d bgd.lib

bgd.lib was generated by implib which is included in DMD.

Here's the code of example.d:

import std.stdio;
import std.stream;
import gd.gd;
import gd.gd_io;
import gd.gdfx;

void main() {
  gdImagePtr result;
  _iobuf* output;

  result = gdImageCreateTrueColor(10, 10);

  gdImageSetPixel(result, 5, 5, gdImageColorAllocate(result, 150, 150, 
150));

  output = fopen("rect.png", "wb");
  writefln("1");

  gdImagePng(result, output);
  writefln("2");

  fclose(output);
  writefln("3");
}

Did I do something wrong?
Any suggestions how to solve the problem?

Alexander