Loading image at runtime

[jedbartlet]

I've only recently started using Visual C++ in the .NET environment but have quite a bit of previous C++ experiemce. I'm embarassed to admit that i'm having a problem loading an image into a picture box at runtime.

 

In the button click event handler i have the following:

 

openFileDialog1->ShowDialog();

pictureBox1->Image = openFileDialog1->FileName;

 

When I compile i get a type error (string to image). I can see why i'm getting the error but can't see how to get round it. (i usually use delphi for windows apps!)

 

Any help appreciated.

[Varghjärta]

Not that I've used c++ in .net but if it's .net my advice would be to go thru the System.Drawing; And from there you could use the Image-class which should have a FromFile()-method which creates an image object that could be passed on to the picture-box.

 

PS. No idea if this would work in managed C++ or whatever it's called. I use mainly C# for everything .Net.

[jedbartlet]

Thanks for that. I've altered the code and now it compiles but the image on the picturebox remains blank.

 

Image *face;

openFileDialog1->ShowDialog();

face->FromFile(openFileDialog1->FileName );

pictureBox1->Image = face;

pictureBox1->Update(); //also tried using refresh

 

Any ideas?!

[Varghjärta]

It looks like your not storing the fetched image correctly. FromFile is static and you should store it in "face" instead then give face to the pic box.

 

Image *face;

openFileDialog1->ShowDialog();

face = Image->FromFile( openFileDialog1->FileName );

pictureBox1->Image = face;

 

 

since I don't know that language I'm just guessing here.

this is the C#.net equivelent which i'm positive would work.

 

 

OpenFileDialog openFileDialog1 = new OpenFileDialog();

Image face;

openFileDialog1.ShowDialog();

face = Image.FromFile( openFileDialog1.FileName );

pictureBox1.Image = face;

[jedbartlet]

It looks like your not storing the fetched image correctly. FromFile is static and you should store it in "face" instead then give face to the pic box.

 

Image *face;

openFileDialog1->ShowDialog();

face = Image->FromFile( openFileDialog1->FileName );

pictureBox1->Image = face;

 

I had the same thought and tried the same thing myself but now the code won't compile! There seems to be an error on the line:

 

face = Image->FromFile( openFileDialog1->FileName );

 

The debugger tells me i've made a class type error. I tried substituting . for-> but to no avail. This is really starting to bug me now!

[Varghjärta]

Try this.

 

OpenFileDialog* openFileDialog1 = new OpenFileDialog();

Bitmap* MyImage;

if(openFileDialog1->ShowDialog() == DialogResult::OK)

{

MyImage = new Bitmap(openFileDialog1->FileName);

pictureBox1->Image = dynamic_cast<Image*>(MyImage);

}

[jedbartlet]

Problem Solved! It works thanks a lot. It seems a strange way of doing it but i'm happy! Thanks. :D

[Varghjärta]

No problem, lol, yes it does seems as a strange way of doing it. I don't even really know C++.

 

Perhaps you should consider emigrating to C#!? it's a lot cleaner,straight forward and logical, atleast from where i'm standing, I mean, if your gonna use .net anyway might as well go all the way :D

 

PS.. didn't mean to sound too missionary.