overlaping images using GDI+ (C#)

Question

Hi all, I'm trying to write a webApplication that holds two png images- big one and smaller one, I need to use the bigger one as a base and place the smaller one on it in a specific posiotion, the smaller one has transparent areas so it adds information to the base picture.

I'm using GDI+ with C#, but I managed only to upload one picture (the base one) using the following code: Bitmap objImage = new Bitmap("basePngPicturePath"); objImage.Save(Response.OutputStream, ImageFormat.Jpeg); objImage.Dispose();

I could,'t use two pictures- it doesn't work... and this was the only way I managed to upload a picture. HELP PLEASE!!! I really need this to work...

Answer 1

You could draw the smaller image onto the larger one before the page is rendered, with code something like this:

Bitmap objImage = new Bitmap("basePngPicturePath");
Bitmap objSmallImage = new Bitmap("smallPngPicturePath");
using (Graphics g = Graphics.FromImage(objImage))
{
    g.DrawImage(...); // there are 30-some overloads of DrawImage, but 
        // basically you use objSmallImage as the source, 
        // plus various ways of telling the method
        // where to draw the smaller image.
}
objImage.Save(Response.OutputStream, ImageFormat.Jpeg);
objImage.Dispose();
objSmallImage.Dispose();

Answer 2

Thanks, I managed to make it work!

but now arrose a different problem-

I need to make this code as a method (not in the defult.aspx.cs form but in a seperate buisnessLogic.cs class) that I can use for different small-pictures- which picture that the user clicked on, then I pass the path of the right picture to this method, but- the Response.OutputStream throus an exception- it cannot be reached from a different form.

can you help me with this problem as well? thanks