Urgent: getting GdkPixBuf out of the image obtained from gtk_image_new_from_file()

[John Ng <john_ng_gtk yahoo com>]

Hi,

   I am new to programming with GTK+ and I need to get some extra information to fill in the gap about the tutorial on GDK and GTK.

 

I am writing a program with zooming capability and need to draw a box "like" selection region (like the one in XV) that can be dragged when the cursor moves. I hope someone can answer my following questions:

 

1)As for the zooming, I tried gdk_pixbuf_scale() to do the scaling but I kept getting segmentation fault when running it.

I tried to figure out what's wrong. I found that as soon as I load the pixbuf from a file, I got this error message. I declared the pixbuf using GdKpixBuf *pixbuf, then load the image file using

pixbuf=gdk_pixbuf_new_from_file(filename);

I didn't do anything else in the program just to test but I always get segmentation fault. Has anyone come across the same problem and figured out the solution?

 

2) As an alternative, I manage to read image successfully with

GtkWidget *image;

image=gtk_image_new_from_file(filename).

I was trying to get the pixbuf from this image but the data structures seem to be different.

gtk_image_new_from_file returns a GtkWidget. The function

gtk_image_get_pixbuf() requires a GtkImage structure as the argument. Can anyone tell me how to get the pixbuf from a file through

gtk_image_new_from_file()?

 

your reply will be greatly appreaciated.

 

Thanks

 

John

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