[cairo] Saving a surface to a file

[yinglcs2 at yahoo.com]

Hi,

I have the following code which save a cairo surface to a png file.
I have run it under cairo 1.0.2 and it works. 

However, as soon as I upgrade my library to cairo 1.2.6. No image is save. the output png is merely 206 bytes. Can any one tell me what do I need to do to following code in order to make it work under cairo 1.2.6?

 char filename[20];
    GetOutputFileName(filename);
    cairo_surface_write_to_png(new_surface, filename);
    cairo_destroy (cr2);

Thank you.




 
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